2013 JAF Grand Touring Car 300(JAF-GT300) Technical Regulations

Transcription

1 Article 1: Vehicle 1.1) Definition Grand Touring Car 300 Automobile having two seats at least and one or more doors on each side respectively for getting on and off. 1.2) Eligibility as an original vehicle Cars produced by an automobile manufacturer, comply with legal requirements for road use and satisfy either of the following conditions: (1) homologated in FIA Group N/A/GT3/GT2/GT1, JAF Production Touring Cars or Special Touring Cars, (2) registered with JAF as registered vehicles. 1.3) Original engine An engine which is produced by its original manufacturer and is legal for road use, and admitted by FIA and/or JAF. 1.4) Optional parts The use of the optional parts which are mentioned in the FIA and/or JAF homologation form or the JAF-GT main specifications register form of the cars registered with JAF is authorized. Article 2: Regulations 2.1) Modifications Any modifications which are not permitted in this Chapter are prohibited. General prescriptions and Safety Cars must comply with the following requirements of Appendix J. Art.252 "General prescription" and Art.253 "Safety", which are not already covered in these regulations ) General remarks except for Art ) Dimension and Weight ) Engine ) Transmission 1/45

2 ) Suspension ) Wheels ) Bodywork / Chassis / Bodyshell Replace Art "Cockpit" by the following text. Cockpit The cockpit is that volume of the vehicle separated from the rest of the vehicle by fixed front and rear bulkheads. For 2-volume vehicles, the cockpit is that volume between the front bulkhead and the bulkhead behind the rear edge of the rear-most seat. Remaining inner space behind that is referred to as the luggage compartment. The bulkheads must be constructed of highly flameproof rigid materials. The cockpit must be completely insulated by the bulkheads from the engine compartment, fuel tank, oil tank, gearbox, propeller shaft, and all joints of piping and tubing (connecting these areas). Any and all devices/substance that is potentially dangerous to the vehicle driver must be installed outside of the cockpit (on the other side of the bulkhead). Only the following accessories may be installed in the cockpit. * Spare wheels * Tools * Spare parts * Safety equipment * Communication equipment * Ballast (if permitted) * Windscreen washer water container * Equipment for cooling suit On 2-volume vehicles, the oil tank may be installed to the luggage compartment provided that bulkheads are used to protect against oil leakage and sparking. except for Art ) Electrical system ) Fuel Combustive Refueling tank must comply with drawing with fuel hose of maximum 5m in length, but flow restrictor is not mandatory ) Brakes ) Dangerous car ) Optional device ) Lines and Pumps ) Braking safety system ) Additional fasteners ) Safety belts ) Extinguishers - Extinguishing systems ) Roll over structures ) Rear view 2/45

3 ) Towing eye ) Windows / Nets Except for the following text "The windows must be certified for road use, their marking standing as proof." Add the following text. Anti-dazzling treatment may be applied as a strip along the upper edge of the glazed surface. The width of the strip must not exceed 100 mm ) Safety fixing device for Windscreen ) General circuit breaker Replace text "As for the out side, the triggering system of the circuit breaker will compulsorily be situated at the lower part of the windscreen mounting of the driver s side for closed cars" by "As for the out side, the triggering system of the circuit breaker will compulsorily be situated at the lower part of the windscreen mounting of the opposite side of driver s side for closed cars" Add the following text. In vehicles whose design makes it impossible to install the circuit breaker close to the lower part of front windscreen mounting bracket, the circuit breaker may be installed outside either of the passenger side center pillar or the quarter pillar, which permits operation from outside ) FIA approved safety fuel tanks ) Protection against fire ) Seats, attachments and supports ) Pressure control valves However, if the prescriptions which have the same meaning as those of the above Articles are defined in this Chapter, prescriptions in this Chapter should be obeyed ) Material restrictions ) Composite material (Including carbon and aramid fiber) If only the use of the material is authorized in this Chapter or the use of the material is standardized on the specific parts or areas of the original vehicle and engine, these composite materials can be used in the relevant parts or areas ) Titanium and ceramics Regardless of the provisions of the present regulations, the following must be respected. 1) If the use of these materials is standardized on the specific parts or areas of the original vehicle and engine, these materials can be used only in the relevant parts or areas. 2) The use of these materials is permitted for the following parts: (1) connecting rods (2) intake and exhaust valves (3) valve retainers (4) heat shield (5) apex seals (rotary engine) (6) brake caliper pistons (7) supercharger 3/45

4 ) Aluminum alloy Regardless of the provisions of the present regulations, the following must be respected. The use of aluminum alloy which has a modulus of elasticity greater than 80Gpa is forbidden except for brake calipers ) The other materials Regardless of the provisions of the present regulations, the following must be respected. The use of a material with a specific gravity greater than 12.0 is forbidden ) Control function restrictions 1) Any automatic or electronic chassis control system or function, excluding traction control system, is forbidden, even if the original vehicle has it. This includes the systems listed in the Appendix 1 of this Chapter. A simple open-loop electrical switch activated by the driver acting on a system is not considered to be electronically controlled. 2) It is permitted to use (add) a speed limiter in order to comply with the speed limit in the pit lane. 2.2) Compliance with the rules and regulations It is the duty of each competitor to give an explanation and accept any checks at the request of the scrutineers and the Steward of the Meeting of the event concerned in order to satisfy them that his car complies with the rules and regulations in their entirety at any time during an event ) Measurements During the event, all required measurements will be made at the location specified by the chief scrutineer and with measuring instrument and apparatus which will be provided by the event organizer. No protest can be accepted against these measurement site, measuring instruments and/or equipment, and measurement methods. Article 3: Bodywork and exterior dimensions Save the modifications authorized in this Chapter, dimensional specifications of the original vehicle mentioned in the homologation form and documents in relation to the registered cars and also their outer shapes without bolts for fitting must be maintained. 3.1) Dimensions 3.1.1) Overall length The overall length of the car must not exceed the sum total of the dimensions of the overhang and the wheel base permitted under Art.3.1.4) below ) Maximum height 4/45

5 The dimension from the bottom surface of the flat bottom to the top of the roof (roof reference plane without local projecting shape, roof rail and auxiliaries such as antenna) must not be less than 1,100mm when measured perpendicular to the bottom surface of the flat bottom. In order to comply with this rule, it is permitted to remove the side sill and the floor, and downward raise of the side sill and moving of the position of the floor are also permitted ) Minimum ground clearance Ground clearance is measured from every direction of the complete vehicle perimeter with tires at the pressure of 160kPa. Clearance must be at least 45mm. Any and all suspended parts can not be situated below this height ) Overhang and wheel base 1) Front overhang The overhang may be extended up to 950mm. However it must not be extended more than 120mm from the frontal edge of the front bumper of the original vehicle. 2) Wheelbase When the dimension of the wheelbase is less than 2600mm, it may be extended by 5%. When the dimension of the wheelbase is 2601mm or more, it may be extended by 1%. However its midpoint may be changed within the range of +/-30mm longitudinally from the midpoint of the wheel base of the original vehicle which is regarded as a base point (this must be notified to JAF with dimensions from the position definable.) 3) Rear overhang When the dimension of the rear overhang of the original vehicle is less than 950mm, it may be extended up to 950mm. 3.2) Windows 3.2.1) Front window The front windshield must be in accordance with the rules under Article 9 of Chapter 4 Safety regulations for homologated cars and registered vehicles. However it is permitted ; 1) that a colorless transparent film is attached to the surface of the front windshield in order to protect it. 2) that the material of the front windshield is changed into polycarbonate of which thickness is no less than 6mm instead ) The other windows 1) The window glass may be replaced with some other transparent material which must permit the cockpit interior to be visible, provided the same installation position, thickness, and shape as the original glass are maintained. 2) Operational method and regulating system of the door window glass may be changed providing that the original function of the door window glass is maintained. To the door of driver's side, door window glass may not be fitted, however, it is obligatory to install protective nets defined under 5/45

6 Article 22 "Net" of the Chapter 4 Safety regulations for homologated cars and registered vehicles. 3) The window glass may have openings, however the total area of the openings must not exceed 15% of the area of the each window concerned. There is no restriction on the shape of the ventilation openings. 4) Air scoops may be installed to the outside surface of any window glass. Maximum protrusion of the air scoop shall be 50mm measured perpendicularly from the outer window surface. 5) Following the removal of auxiliary accessories such as weather stripping and molding, it is permissible to install the window glass (except door window glass) directly to the vehicle bodywork. 6) The surface of the windows that are installed at the rear of the door windows on the lateral surface of the car may protrude to the plane of extended surface of the door window glass. 7) A partition window may be replaced with a firewall. 8) When a tinted glass or a window film is used for side or rear windows, a driver inside the car must be visible at a distance of 5 meters. 9) Windows situated to the rear of the door (of the front door for 4-door vehicle) and to the rear of the rear bulkhead may be devitrified. If it is devitrified by painting, it must be clearly distinguished by the contrastive color with the livery. 3.3 Bodywork 3.3.1) Changes in bodywork materials Materials of front and rear bumper, fender, bonnet (including engine-cover), rear hatch gate and boot-lid components may be replaced by plastic materials or light metals provided that these substitutions maintain enough structural strength and do not result in configurative changes. However, if the bonnet (including engine-cover) and the rear hatch gate include glass component and the glass material is changed, former part of glass component must be clearly distinguished by a parting line. If the part is painted, it must be clearly distinguished by the contrastive color with the livery. Nevertheless configurative changes may be made only if the prescriptions of this Chapter so defined. It is permitted to remove the reinforcement members on the back of the structures of bonnet (including engine-cover), rear hatch gate and boot-lid provided the structural strength of these structures are maintained ) Door 1) For the door configuration, it is permitted that its area between the bottom surface of the flat bottom and up to 120mm above it is removed, but the shape of the other part must be original. The back of the door configuration may be altered. 2) The materials of the door can be changed into plastic materials or light metals provided that this maintains sufficient strength of the structure. 3) Door hinge can be changed only for the purpose of giving the driver a quick escape from the car during accident. If a door hinge is included in the part removed under 1) above, the relevant door hinge may be changed. For 4-door vehicle, four or more fasteners comply with 3.4.4) may be used instead of door hinges 6/45

7 and door locks when the function of opening/closing for rear doors is retained. 4) If the door mirrors are moved, original door mirror bases can be changed into plastic materials or light metals. 5) For 4-door vehicle, rear doors may be widened in their width. The width shall be limited to the extended outer surface of the rear fender. However the configuration of the car when viewed from the side must be retained other than the part which is cut for forming wheel arch. The function of opening/closing for rear doors is free ) Openings made in the bodywork ) Openings in the bonnet (including engine-cover), rear hatch gate and boot-lid 1) They may be made to allow dissipation of heat and cooling provided the configurations of these covers are not modified substantially. The openings are also allowed to be closed providing the closed areas keep the original shapes or form outer enveloping surfaces. However the opening of the bonnet (including engine-cover) must fulfill the following conditions: (1) It is situated 100mm forward of the rear edge of the bonnet (including engine-cover). (2) The longitudinal length of the opening is 1,000mm maximum from the rear edge of the bonnet (including engine-cover). (3) The maximum width is up to 625mm to the right ant left respectively from the longitudinal car centerline. the rear edge of the bonnet Parallel lines of the rear edge of the bonnet Drawing 7-1 2) They may be made in the rear hatch gate and boot-lid to allow dissipation of heat and cooling provided the configurations of these are not modified substantially. 3) Opening accompanied by a change in hatch gate configuration may be made. However if it is made within the extent of the original window, the change is limited within 15% of the original window surface of the rear hatch gate and the total width of the opening is 400mm which must be symmetrical to the longitudinal center line of the car. 4) Louvers, ribbing or lips etc. of which maximum protrusion up to 20mm may be installed and ducts which are connected to the openings may be added. However when viewed from above these openings must not permit the inside structure to be visible other than that of the duct connected to an opening concerned. 7/45

8 ) Opening on fender Cut-out (exit hole) may be created on the fender situated rear of the rearmost part of the complete wheel to permit the escape of air used to cool the brakes. The inside must not be visible through this exit hole when viewed from above and the side. However, when an exit hole used to provide an exit for air already used to cool the brakes is situated behind the rear wheels, except the part below the horizontal plane passing through the center of the rear complete wheel, it must be covered either with a louver or with a very fine wire mesh in order to allow nothing to exit other than air. When opening is made on the fender for passing an exhaust pipe, the opening may have a gap up to half of the diameter of the exhaust pipe ) Opening on ceiling One opening may be made on the ceiling providing the following conditions are respected: 1) It must be positioned no less 100mm behind of the rear edge of the front windshield. However if it is made for introducing intake air to the rear engine, it must be situated behind the rearmost edge of the rear bulkhead (air duct can be connected to the opening made on the ceiling). 2) Longitudinal length of the opening must not exceed the half of the ceiling's total length. 3) Its maximum width must be 400mm and symmetrical to the longitudinal centerline of the car. 4) It must not protrude from the surface of the car except air scoops which may be installed to the outside surface of the bodywork, of which maximum protrusion shall be 40mm measured perpendicularly from the outer surface. 5) When viewed from above, it must not permit the interior to be visible. 6) The structure inside the cockpit shall be no more than 150mm underneath the inside surface of the ceiling and also be 100mm minimum above the driver's head ) Openings on the side of the bodywork when an engine is moved to the rear When an engine is moved to the rear, openings can be made for the rear doors in case of 4-door vehicle, and on the body side panel at the rear part of the door in case of 2-door vehicle, for the purpose of for example leading air for cooling of heat exchanger providing the following conditions are respected: 1) (1) In case of 4-door: It should be situated inside the peripheral parting line of the rear door and under the parallel plane passing 770mm above the bottom plane of the flat bottom (The shaded portion of the Drawing 7-2). (2) In case of 2-door: It should be situated under the parallel plane passing 770mm above the bottom plane of the flat bottom and in the area determined by the backward extended lines from the rear edge of the door parting line and the lower parting line of the door and a plane perpendicular to the bottom plane of the flat bottom passing the center of the rear wheel axle (The shaded portion of the Drawing 7-3). 8/45

9 2) It must not allow the inner part to be seen from the side and above. 3) Louver-shaped is prohibited and air scoop of maximum 50mm protrusion may be installed for the opening. However the maximum width of the competition vehicle must not be exceeded as a result. Frontal edge of the rear door Lower parting line of the rear door Drawing 7-2 The backward extended lines from the rear edge of the lower parting line of the door Drawing ) Openings for the rear part of the bodywork Openings situated at the rear of the bodywork must be covered with a very fine wire mesh or a punching metal etc ) Hinges of bonnet (including engine-cover), rear hatch gate and boot-lid Hinges may be removed provided that the fasteners do not allow bonnet, rear hatch gate and boot-lid to open during the vehicle in motion. Where the engine or the fuel tanks are installed, these fasteners must be able to remove without tools. 9/45

10 The fasteners must be clearly indicated by a red (or contrastive color) arrow ) Bodywork (monocoque structure) and bulkhead The original bodywork (monocoque structure) and bulkhead must be maintained for the cockpit area other than the modifications specifically allowed in this chapter. The shape and material of "the back end panel" are free provided the external appearance of the car is not modified, however bodywork structure that is not covered with fender, bumper and finisher must be remained. Other than the front and rear bulkheads, openings situated originally in the cockpit may be sealed ) Front bulkhead (including cowl top) 1) Original front bulkhead may be removed for installation of a new bulkhead which isolates the cockpit entirely. However, if the cowl top is also removed the supporting structure for the lower edge of the front window must be newly constructed. The material and the shape of the cowl top cover are free. But it must not protrude from the perimeter of the rear edge of the bonnet when viewed from the front. 2) Opening which is connected to the opening defined under Art ) is permitted for the purpose of ventilation of the cockpit provided the isolation function is maintained. If the vent of the cockpit is connected to the duct installed at the back of the bonnet (including engine-cover), the connected part must be of the structure which can prevent fire from intruding into the cockpit when a fire in the engine compartment. 3) The area to which the front bulkhead reference plane (plane on the front side of the car) may be installed: The longitudinal position of the new bulkhead should be +/-250mm from the original position of the original vehicle. 4) The shape and material of the front bulkhead, structure of connection of the openings defined under Art ) or a part which seals the openings existed originally: Shape: free Material: identical to that of the monocoque of the original vehicle and has equal or greater thickness than that. 5) Openings may be made for the purpose of modifications permitted under Art.3.3.8)" Tunnel installation to the floor part", ) and by this provision, and for connecting the tubular structure defined under Art.3.3.6) "Bodywork structure fore of the front bulkhead and hind of the rear bulkhead "to the rollcage. However if it is necessary to create an opening its size must be minimal for its purpose ) Rear bulkhead 1) New bulkhead may be installed after the rear bulkhead of the original vehicle is removed. 2) It is obligatory to install rear bulkhead which is positioned behind the driver s seat when viewed through from the side and can isolate the cockpit completely. However, minimum opening 10/45

11 connected to the opening according to )-2) for the ventilation of the cockpit is permissible on condition that the cockpit s isolation function is duly maintained. Area permitted for bulkhead Drawing 7-4 3) The shape and material of the rear bulkhead, structure of the connection of the openings according to ) or a part which seals opening existed originally. Shape: Free Material: The bulkhead or the part must be made of a rigid and sufficiently fireproofing material. (1) Material which is identical to that of the monocoque of the original vehicle and has equal or greater thickness than that. (2) Carbon fiber material having honeycomb construction no less than 10mm thickness. (3) Carbon fiber composite having no less than 3.5mm thickness. 4) A structure can be built, for which a plane extended horizontally from the main bottom plane of the floor can be connected with a plane extended from the main plane of the rear bulkhead ) Rear midship-engine vehicles The followings are adopted for rear midship-engine vehicles in addition to the above )"Front bulkhead" and )"Rear bulkhead": 1) The bulkhead separating the engine compartment from the luggage compartment and the floor part of the engine compartment and the luggage compartment may be removed, save the members which affect the bodywork such as reinforcement members for the floor part of luggage compartment. 2) If the fuel tank is installed to the luggage compartment of rear midship-engine vehicles, there must be no cut-out in the said bulkhead. 3) Structural members supporting the bulkheads which isolate the engine compartment from the luggage compartment may be changed into a detachable construction provided that this construction does not affect the strength of the bodywork ) Bodywork structure fore of the front bulkhead and hind of the rear bulkhead 11/45

12 Main structure (structural framework) situated fore of the front bulkhead and/or hind of the rear bulkhead may be cut and replaced by the tubular structure which is connected with the rollcage. The material of the outer plane behind the rear bulkhead which serves also as a part of body structure (monocoque structure) may be replaced by synthetic resin or light metals provided that substantial strength and the shape, excluding permitted conditions defined under ) "opening on ceiling", are maintained. The plane may be removable only when it can be separated from each door, fender and boot-lid. However, no play or gap between the part and the silhouette is permitted when seen from the front, the rear and the side and it must be secured rigidly by hinges, a locking mechanism or the four or more fasteners defined under Article 3.4.4). When the main structure(structural framework) fore of the frond bulkhead is replaced by the tubular structure connected with the rollcage, it is obligatory to install a crushable structure defined under Article 12.5) of the present regulations. A tubular structure must conform to the following conditions: 1) Material: steel 2) Yield strength: endurable with 5.5W longitudinal, 1.5W lateral and 1.5W vertical loads (W=1,500kg) (1) Parts to which the above loads are applied: Front tubular structure: attachment points of the crushable structure Rear tubular structure: the rear edge of the tubular frame concerned (2) Conditions when the above loads are applied: (1) The floor part of cockpit is fixed (2) In running order (example; holes for the fixation of the suspensions are not closed. If an engine, a gear box or a flat bottom etc. has a function as a stress member, it remains on that part.) (3) The following verification of withstanding against the obliged yield strength shall be submitted to JAF: (1) The result of the static load test, of the strength calculation (calculation report) or of the analysis of the strength must be presented to JAF. (2) Drawing of rollcage and tubular flame general construction and tube material & dimensions. It is not necessary to present the verification every year unless the vehicle type and its design remain the same. 3) Method of fixation to rollcage, diameter and thickness of pipes Free, including shape of the tubes. However any processing or modification to the rollcage homologated by FIA or JAF following the fixation of a tubular structure is not permissible. 4) Even if the engine is dismounted, the parts which suspend the bodywork must work normally ) and floor It is obligatory to install a flat bottom which complies with the following conditions. The flat bottom must be installed across the total width of the car seen from its underneath without tire wheel 12/45

13 housing and outer mirrors. 1) A solid body that is rigid, flat and impervious plane under any circumstance, which covers the lower surface of the car between the center line of the rotational axle of the front wheel and the center line of the rotational axle of the rear wheel must be secured. Materials are free. Minimum width of the flat bottom is 950mm and it shall be symmetrical about the longitudinal center line of the car. This plane may be composed of several pieces. However the gap of each piece between them must be less than 1mm and the tolerance in vertical direction across the whole plane area is 5mm maximum. 2) In any case, the flat bottom must not have an aerodynamic effect. 3) No air stream may pass between the floor of cockpit and the flat bottom except the parts fore of the bulkhead, of passing the exhaust pipes(except side sill), center tunnel and tunnel for rear engine vehicles. Bulkhead Floor Center line of the front wheel rotational axle Center line of the rear wheel rotational axle Front edge of floor Front edge of flat bottom Rear edge of flat bottom Drawing 7-5 4) Any suspended part of the car, regardless of the provisions under Art ) "Front aerodynamic device" of the present regulations, must not situate below the plane formed by the flat bottom. 5) It is permitted to have radius of maximum 25mm upwardly at the periphery edge of the flat bottom. 6) Openings may be made into the flat bottom for the following reasons. (1) Pneumatic jack use (2) Extraction of heat from the exhaust pipe ; - The holes should be within the area corresponding to exhaust pipe diameter. - The holes must follow the shape of exhaust pipe. - Maximum diameter is 50mm 13/45

14 - Number of the ventilation holes is free. (3) Sensor use (Maximum diameter is 20mm) However, for the purpose of passing the optical axis of the ride height sensor, it is permitted to make maximum 4 holes (slits) of the dimensions of 20mm x 50mm (maximum). 7) The flat bottom can be installed in such a way that the straight part of lower surface of side sill except flange is the top of it. However if the flat bottom interferes with the floor of the original vehicle, the original floor may be modified or new flat floor of the material prescribed in Article ) "Shape and material" may be created. 8) In order to mount the flat bottom, part situated below the straight line of the lower surface of the side sill may be bent or cut. Fender arch Side sill Fender arch Straight line of the lower surface of the side sill Section Floor Side sill Side skirt Bend or cut Drawing 7-6 9) Provisions under Art )- (3) "The shape of the tire housing" shall be satisfied Tunnel installation to the floor part 1) Center tunnel A new tunnel may be created following removal of the center tunnel of the original vehicle within the following dimensions. Material: must be rigid and sufficiently fireproofing material. (1) Material which is identical to that of the monocoque of the original vehicle and has equal or greater thickness than that. 14/45

15 Permitted volume with dimensions for installation of center tunnel Rear Bulkhead Symmetrical to the center line of car 800mm Front Bulkhead Lower surface of the flat bottom Drawing 7-7 2) Tunnel installation for exhaust pipes (1) One tunnel may be installed of which width up to 210mm and height up to 210mm provided it does not affect the shape of the flat bottom toward the upper direction of the floor. However if a car has an engine having banking on its RH and LH at the front, it is permitted to install one tunnel for the RH and LH respectively. (2) The processing to the surface of the bulkhead should be limited to a circumscribed square with a diameter up to 210mm ) Body side panel and side sill ) Body side panel, side sill and floor 1) Body side panel, side sill and floor situated below the parting line at the lower part of the door window may be newly installed after original body side panel, side sill and floor are removed. 2) Shape and material: Shape: free However outer surfaces of the body side panel and the side sill must be situated no more than 250mm above the bottom surface of the flat bottom and between 120mm transversely inward from the lower edges of the door outer surfaces. But modifications permitted under Art.3.3.8)-2) "Tunnel installation for exhaust pipes" is permissible. Material: rigid and sufficiently fireproofing material composed of the followings: (1) Material which is identical to that of the monocoque of the original vehicle and has equal or greater thickness than that. (2) Carbon fiber material having honeycomb construction no less than 10mm thickness. (3) Carbon fiber composite having no less than 3.5mm thickness. 3) The structure which allows air to pass inside the side sill is prohibited. 4) To the lower part of the door between the front fender and the rear fender, side sill cover may be installed following widening of outer surface of the original vehicle (door outer panel, outer surface of the side sill or outer surface of side sill cover), however parts not widened must maintain identical surface with the original vehicle. The structure which allows air to pass between the outermost surface of this part and side sill is 15/45

16 prohibited. When an opening is made for the purpose of passing exhaust pipe on the outmost surface, it should be limited to a circumscribed square with a diameter up to 120mm when viewed from the side. 5) If the side sill cover is installed, its material is free. Door Outer surface of body side panel & side sill Body side panel & side sill Side sill cover Lower edge of the door outer surface Side skirt Drawing 7-8 Door Exhaust pipe tunnel Body side panel & side sill Side sill cover Exhaust pipe Door lower edge Side skirt Drawing ) Bumpers ) Front bumper 1) The shape of upper part which is divided by a horizontal plane passing 300mm above the flat bottom base must be retained as original between the base points P1 and P2 of the Drawing P1 and P2 are the points where a straight line having 75% of the maximum width of the original vehicle which intersect vertically with the longitudinal centerline of the car and symmetrical to it, 16/45

17 contact with the perimeter of the front bumper when viewed from above. 2) Between the base points P1 and P2 (Drawing7-10) defined above 1), the bumper part situated more than 40mm and 300mm or less above the bottom surface of the flat bottom may be modified (including addition of opening) if the area falls inside the contour of the original bumper. 3) There are no restrictions on reinforcement members for the inside of the bumper ) Rear bumper 1) The shape of the upper part between the base points P3 and P4 on the Drawing 7-10 and aloft the horizontal plane passing 300mm above the bottom surface of the flat bottom must be retained as original. P3 and P4 are the points where a straight line having 80% of the maximum width of the original vehicle which intersect vertically with the longitudinal centerline of the car and symmetrical to it, contact with the perimeter of the rear bumper when viewed from above. 2) Modification(including cut) of bumper configuration situated lower than 300mm from the bottom surface of the flat bottom may be permitted within the area determined by the rear axle center line and the line parallel to it at the rear edge of the bodywork and the straight lines at an angle of 30 in relation to the latter at the points laying 665mm from the longitudinal centerline of the car each side and the lines parallel to the longitudinal centerline which contact with the outmost perimeter of the bodywork (refer to Drawing 7-11). However horizontal surface must be maintained at the bottom of the modified bumper within 650mm from the longitudinal centerline of the car each side. 3) There are no restrictions on reinforcement members for the inside of the bumper. W1: 75% of the maximum width of the original vehicle W2: 80% of the maximum width of the original vehicle Drawing /45

18 Rear edge of the car Center of rotational axle of rear wheel Longitudinal center line of car Overall width of the car Extended line from the base of the flat bottom Drawing 7-11 Rear edge of the car ) Changes in bumper configuration accompanied by widening of fender width These changes in bumper configuration are permitted subject to the following conditions only. In order to facilitate examination of the configuration change, participants must carry a template with them. 1) Permissible area for the changes of front bumper configuration This must remain within the area determined by the straight lines at an angle of 30 in relation to the lines connecting base points P1 & P2 and the straight lines parallel to the longitudinal centerline of the car which contact with the outermost perimeter of the bodywork (refer to Drawing 7-10). Furthermore, R in some degree must exist at each of the intersection points when viewed from above. However, the front bumper situated within the area defined under the relevant regulations must not be in the shape of canard or similar to it (ledge shape extended longitudinally). 2) Permissible area for the changes of rear bumper configuration 2)-1 Part above a parallel plane passing 300mm above the flat bottom base. This must remain within the area determined by the straight lines at an angle of 30 in relation to the lines connecting base points P3 & P4 and the straight lines parallel to the longitudinal centerline of the car which contact with the outermost perimeter of the bodywork (refer to Drawing 7-10). Furthermore, R in some degree must exist at each of the intersection points when viewed from above. 2)-2 Part under a parallel plane passing 300mm above the flat bottom base. When seen from above, modification of the rear bumper in this area is permitted if it remains within the area determined by the rear axle center line and the line parallel to it at the rear edge of the bodywork and the straight lines at an angle of 30 in relation to the latter at the points laying 665mm from the longitudinal centerline of the car each side and the lines parallel to the longitudinal centerline which contact with the outmost perimeter of the bodywork (refer to Drawing 7-11). Furthermore, R in some degree must exist at each of the intersection points when viewed from 18/45

19 above ) Fenders 1) Fender may be widened up to 1,950mm within the overall width of a car. The front part of the front fender and rear part of the rear fender must be fit within the area defined under Article ) "Changes in bumper configuration accompanied by widening of fender width "when seen from above. The rear edge of the front fenders must not extend over the parting line at the front edge of the doors (the dimension of front fender may not be increased in longitudinal direction). Parting line at the front edge of the doors Fender cannot be extended to the rear of the line Drawing ) The design of the fender parts which are extended is free, however opening made must respect the provisions of Art ) "Opening on fender" of the present regulations and have radius of 5mm or more at projected parts having acute angles on the outer surface of a car, the fender parts which are not extended must have identical surface with the original vehicle. 3) When the fenders of the original vehicle have openings for intake and cooling for the engine, it is permitted that the dimensions of the openings are altered or the openings are closed as a result of extension of the fenders. However it is obligatory to respect the provisions of Art ) "Opening on fender" of the present regulations even in the former case. 4) Bumper and fender construction where the bumper extends into the inside of the fender are permitted only if this is the original vehicle design. 5) Fender must not protrude beyond the perimeter of the upper edge of the fender of the original vehicle viewed from the side. However if the tire housing installed in accordance with the prescriptions of )"Tire housing" interferes with the fender, the curved part which contacts with the installed tire housing may protrude from the perimeter of the upper edge of the fender and the relevant projected part may be connected with its circumference smoothly (by smooth radius). 19/45

20 Projecting part as a result of construction of the tire housing Smooth radius Smooth radius Parting line of the fender of the original vehicle Drawing ) If the original rear fender and rear pillar are of integral construction, the fender is considered to be below the horizontal plane passing through the lower edge of the rear window ) Tire housing ) In order to allow the tire housing to accommodate the front/rear complete wheel, an independent tire housing which is formed by the planes inside of wheel arch must exist regardless of the structure of the original vehicle. There are no restrictions on tire housing materials. 1) Tire housings must be installed within the area defined below, with the complete wheels in the straight ahead position and the car in running order. (1) Parallel to the bottom surface of the flat bottom, and above the plane passing through the wheel center line: In the area within a radius of 410mm of the wheel rotational axle. The transverse position (to the right and left of the car) is free. (2) Parallel to the bottom surface of the flat bottom, and below the plane passing through the wheel center line: In the area delimited by the planes passing the center of the rotational axle of the right and left wheels and parallel to the plane perpendicular to the bottom surface of the flat bottom, and within 410mm to the front and the rear respectively. The transverse position (to the right and left of the car) is free. (3) The shape of the tire housing (1) The shape of the tire housing is free. (2) The tire housing and the bodywork structure which are situated less than 50mm above the bottom surface of the flat bottom in the area of the tire housing situated behind the frontal edge of the flat bottom and in front of the rear edge of the flat bottom must be covered by the flat bottom when seen from its underneath. 20/45

21 Examples of the front tire housing The angle is free Examples of the rear tire housing Radius 25mm Rear tire housing Rear tire housing Radius 25mm Rear tire housing Rear tire housing The angle is free Drawing 7-14 (4) Opening may be created on the aft part of the tire housing which is connected to the cut-out(exit hole) permitting the escape of air used to cool the brakes created under Art ) "Opening on fender". (5) Creating opening is permitted for the purpose of passing sprung parts, driving device and ducts for cooling the brakes and of extracting heat from the exhaust pipe. 2) If the tire housing of the original vehicle was constructed already beyond the size defined by 1) above, it must be within the dimensions of the original vehicle. 3) However where the front edge or the rear edge of the tire housing interfere with the bulkhead, modifications may be made solely in the area within a radius of 460mm of the front wheel axle rotational center with the wheels in the straight ahead position for the front bulkhead, and in the area within a radius of 410mm of the rear wheel axle rotational center for the rear bulkhead. 21/45

22 4) The side sill exists within the area defined by 3) above may be removed ) In order to build tire housing, it is permissible to remove original side rail-uppers and the framework around it on condition that there is no decrease in the structural rigidity, except when any upper attachment point of suspension struts is installed to the parts concerned ) Where the drive-shafts interfere with the side members, the parts concerned may be modified within the smallest possible area. However in order to maintain the structural rigidity which might be altered by the modification carried out, the modified parts must be reinforced ) Side skirts Side skirts are permitted on condition that, and there are no restrictions on side skirts materials. 1) it is installed below the horizontal plane passing through the center of the front and rear wheel rotational axles of the car in running order. 2) within the area (width) extended by the maximum vehicle width. 3) The front/rear edge and the lateral edges must have a radius of more than 5mm. 4) The outer surface of the side skirts may not enter the inside of the outer surface of the original vehicle. 5) Furthermore it must be connected to the flat bottom without any gap and also to the front/rear fenders ) Engine compartment ) Radiator support and its supporting members may be removed ) Bonnet (including engine-cover) If the tire housing installed in accordance with the prescriptions of )"Tire housing" interferes with the bonnet (including engine-cover), rear hatch gate or boot-lid, the relevant part which contacts with the installed tire housing may protrude in a curved shape follows the upper edge of the tire housing. The relevant projected part may be connected with its circumference and the fender smoothly (by smooth radius) ) Luggage compartment The floor of the luggage compartment may be modified or removed but the ground may not be seen. 1) If the floor of the luggage compartment is modified; 1.1) When any rear aerodynamic part does not exit under the floor: (1) The shape shown in the drawing 7-15A is prohibited. (2) The floor surface must be flat and parallel to the flat bottom (see drawing 7-15B). (3) When the floor surface is flat and parallel to the flat bottom, it can be lowered by the level of the flat bottom. 1.2) When rear aerodynamic part exists under the floor : (1) When rear aerodynamic part under the floor exists to the rear edge of the car, the shape of 22/45

23 the floor surface situated above it is free (see drawing 7-15C). (2) When rear aerodynamic part under the floor does not exists longitudinally to the rear edge of the car, the shape of the floor surface behind its rear edge must be flat and parallel to the flat bottom as well (see drawing 7-15D). (3) Air must not flow in longitudinal direction between the rear aerodynamic part under the floor and floor surface. Drawing ) Regardless of existence of rear aerodynamic part under the floor, only the air passed through radiator may flow in the space situated above the floor surface of luggage compartment. If the air flows (in the space) over the lowest surface of the bodywork (floor surface of the luggage compartment) and the purpose of that opening is the escape of air which passes through radiator installed inside the luggage compartment etc., the cross section of the opening must be less than the area of the radiator core. 2) When the floor of the luggage compartment is removed; (1) It is permitted install a crushable structure in order that the influence resulted from these changes against impact must be minimal. (2) In order to provide greater rigidity for the bodywork, cross-members can be freely added. 3) If a safety fuel tank installed in the luggage compartment; Appropriate steps may be taken to prevent the fuel tank from falling. This includes the addition of structure by reinforcement- members to secure its safety ) Hard top for open cars Provided the following conditions are observed, hard top for open car may be installed. 1) Configuration: If the original open car has a soft top or a hard top as its optional parts, the hard top which may be installed must maintain its configuration similar to the original. 2) Material: rigid and sufficiently fireproofing material and must be either of the followings, except the attachments (including flanges); (1) Material which is identical to that of the monocoque of the original vehicle and has equal or greater thickness than that. (2) Carbon fiber material having honeycomb construction no less than 10mm thickness 23/45

24 (3) Carbon fiber composite having no less than 3.5mm thickness. 3) The highest point: The highest point indicated in the 3- view-drawing of the catalogue of the vehicle concerned should be regarded as the highest point of the car. 4) Fixation: There is no restriction on its fixation method. However fixing to homologated rollcages may be authorized only if there is no need to carry out any modification to the rollcages ) Vehicle interior With the exception of the luggage compartment, vehicle interiors must remain as they were in the original vehicle (Any mechanical structural element must not exist other than that is originally installed in the vehicle). Modification and replacement of the dashboard (instrument panel) are permitted. But complete removal of the dashboard (instrument panel) is not permitted. Flexible air ducts made of non flammable material may be installed to the vehicle interior for the purpose of cooling the driver and various auxiliary equipment(electrical equipment). It is also authorized that the flexible ducts are connected with air scoops specified in Article3.3.19) "Auxiliary accessories" of the present regulations, however it must not obstruct driver's visibility. Oil tank installation to the vehicle interior (cockpit) is not permitted ) Reinforcement Reinforcement of the bodywork (including bulkhead) is free provided it does not encroach on the spaces inclusive of driver's and passenger's compartments ) Auxiliary accessories Demisting devices and cockpit ventilation systems are free provided that the original ventilation openings are remained and the outside shape is not significantly changed (Maximum protrusion 20mm). 3.4) Aerodynamic device 3.4.1) Front aerodynamic device (1) The device may be installed under the bodywork within the area determined by the parallel line max. 950mm forward of the line connecting the axle centers of right and left front wheel and the straight lines at an angle of 30 in relation to the fore-mentioned parallel line at the points laying 460mm from the longitudinal centerline of the car and the lines parallel to the longitudinal centerline which contact with the outmost perimeter of the bodywork. This area must also be 130mm or less above the base of the flat bottom. 24/45

25 Overall width of the car Front edge of the flat bottom Front wheel axle centerline Front axle center Front aerodynamic device Height limitation at front and rear edges Drawing 7-16 Front edge of the flat bottom (2) Materials are free. (3) The frontal edge and the lateral edges should have a radius of more than 5mm. (4) Lower structure of the bodywork may be connected to the lower part of the fender which is situated forward of the vertical plane passing through the foremost point of the front complete wheel. (5) For the examination of (1), participants must carry a template with them. (6) Flap (canard) may be installed in the area (Drawing 7-17); (i) below the horizontal plane passing 250mm above the bottom surface of the flat bottom of the car; (ii) forward of the front complete wheel and outside of the points P1 and P2 ; (iii) inside the parallel line max. 950mm forward of the line connecting the axle centers of right and left front wheel and the straight lines at an angle of 30 in relation to the fore-mentioned parallel line at the points laying 460mm from the longitudinal centerline of the car and the lines parallel to the longitudinal centerline which contact with the outmost perimeter of the bodywork. (iv) be 120mm or less from the perimeter of the bodywork. 25/45

26 The longitudinal centerline of the car Overall width 75% of the original car Front wheel axle centerline Overall width of the car point Section Max. Canard Max. Drawing ) Rear aerodynamic device As a rear aerodynamic device, either a rear air spoiler or a rear wing may be installed provided the followings are observed: 1) Number of the device should be one unit. 2) The wing should be one and any part of the aerofoil section should be able to fit in a 400mm 150mm rectangle (including gurney-flaps, excluding supports and end plates). 3) Its height should be limited by the top of the ceiling except optional parts(1,100mm above the bottom surface of the flat bottom). 4) The maximum width is 1,900mm (including supports and end plates). The area determined by the line parallel to the rear axle center line at the rear edge of the bodywork and the straight lines at an angle of 30 in relation to the line at the points laying 665mm from the longitudinal centerline of the car each side and the lines parallel to the longitudinal centerline which contact with the outmost perimeter of the bodywork (refer to Drawing 7-18) is to be regarded as the outermost edge of the perimeter of bodywork, and the above mentioned rear device may be installed within this extent. 26/45

27 Rear edge of the car Rear wheel axle centerline Rear wing Drawing ) It should be placed above the perimeter of the bodywork and the parting line of the rear fender when viewed from the side, or on the surface of the boot-lid (engine-cover). (It is not permitted to install any aerodynamic device onto the rear fender.) 6) It should be situated behind a plane vertical to the bottom surface of the flat bottom and passing through the center of the rear wheel rotational axle. 7) The frontal edge and the lateral edges including end plates should have a radius of no less than 5mm. 8) The shape and materials are free. When installing the device to the boot-lid, it is permissible to install reinforcements to the inside of the boot-lid to provide greater rigidity for the fixation of supports. 9) The boot-lid and rear hatch gate should be able to be opened and closed without removing any structural part ) Aerodynamic devices beneath the rear floor It is permitted to add a completely flat inclined panel without openings under the following conditions. Under the floor no less than 350mm behind the center of the rear wheel rotational axle and 650mm from the longitudinal center line of the car on each side, it is permitted to install only aerodynamic parts mounted to the original vehicle or a completely flat inclined panel without openings (inclined panel) under the following conditions. Neither the said aerodynamic parts nor the inclined panel may be installed, but they can not be installed together. However if any structural part of the car interferes with the inclined panel when the frontal edge of the inclined paned is moved, the part concerned may protrude in a shape of rectangular parallelepiped which is parallel to the surface of the flat bottom. 27/45

28 Materials are free. Regardless of the existence of the inclined panel, free for the area beyond 650mm from the longitudinal center line of the car on each side and aft of the plane vertical to the bottom surface of the flat bottom and passing through the center of the rear wheel rotational axle, and also under the parallel plane passing 300mm above the bottom surface of the flat bottom. 1) Between the vertical planes, one passing through the rear edge of the flat bottom (a vertical plane passing through the center line of the rear wheel rotational axle) and the other passing through the rearmost point of the bodywork. 2) Maximum width of the panel is 1300mm and it shall be symmetrical in relation to the longitudinal center line of the car. 3) No part of the panel may be situated more than 150mm above the flat bottom. 4) Exhaust pipe and air-cooled cooler radiator are permitted to be installed. Inclined panel Drawing ) Shielding is optional and may be installed on the lateral part of the inclined plate. Materials and the shape are free when it is installed. 5.2) If there is any removable auxiliary part such as a grill at the rear of the original vehicle, it may be removed providing the following conditions are respected: When a bodywork part exists under the auxiliary part and no gap exists between it and the inclined panel, the space created after the auxiliary part is removed should be covered according to the Art ) "Openings for the rear part of the bodywork" of the present regulations. 6) The junction between the rear edge of the flat bottom and the foremost point of the inclined panel must be continual and may have a radius of up to 25mm. 7) Vertical fins may be installed under the following conditions, Materials are free: (1) They remain parallel to the longitudinal center-line of the car. (2) They exert no aerodynamic influence. (3) Maximum 4 fins (4) Vertical fins may be extended from the rear edge of the panel to the rear, however the highest 28/45

29 edge within the width of 1,300mm must not be more than 150mm from the flat bottom and the rear edge must be situated inside the outline of the car. When the upper extended part is fixed to the bodywork openings must be made according to the Drawing The lower surface of the bodywork structure The ground must not be seen when a boot-lid(trunk) or a hatch gate is opened Space Inclined panel Vertical fin Vertical fin extended from the rear edge of the panel to the rear The lower surface of the bodywork structure Bracket to install vertical fin extended from the inclined panel to the rear Circle of the diameter of 50mm Inclined panel Vertical fin Vertical fin extended from the rear edge of the panel to the rear The lower surface of the bodywork structure Inclined panel Vertical fin Drawing 7-20 Vertical fin extended from the rear edge of the panel to the rear 8) Openings may be made into the inclined panel for the following reasons: 29/45

30 (1) Pneumatic jack use (2) Extraction of heat from the exhaust pipe. - The holes should be within the area corresponding to exhaust pipe diameter. - The holes must follow the shape of exhaust pipe - Maximum diameter is 50mm. - Number of the ventilation holes is free. (3) Sensor use Up to 2 openings with the maximum dimension of 20mm x 50mm 9) If rear aerodynamic part is installed under the floor and its dimension from the longitudinal center line of the car to the right and left is less than 650mm respectively, it is not permitted to install any structure except exhaust pipe and oil cooler (including its lines) in the area defined by its edge and by the lines situated 650mm from the longitudinal center line of the car. Article 4: Weight 4.1) Minimum weight Minimum weight must be respected as laid out in the Appendix 2 of this Chapter. The JAF may change the minimum weight requirements with notice in advance at any time during the season in order to provide equality of performance. 4.2) Ballast It is permissible to install one or more ballast to fulfill the requirement of the minimum weight. The position and the installation method of the ballast are free, but both the ballast and the bodywork part to which the ballast is fixed must have sufficient strength. Article 5: Engine 5.1) Type and position of engine An engine from another model of car can be mounted if it derives from the homologated or registered vehicle of the same manufacturer. The mounting position, location and orientation of the engine are free provided the engine is situated fore of the front bulkhead or aft of the rear bulkhead. 5.2) Engine modifications 5.2.1) Cylinder capacity Modifications to cylinder capacity are permitted ) Supercharging device Free ) Cylinder head and cylinder block 30/45

31 Reinforcement of the head and block is permitted ) Crankshaft and connecting rods Free ) Bearings Free provided that the original type of the bearing (plane bearing, roller bearing, etc.) is maintained ) Cylinder head gasket Free ) Camshaft and valves (including valve springs) Modifications to camshaft position / number and changes to the driving system are not permitted however, the other elements are free. Only when variable valve timing is installed to the original engine and its mechanism remains identical to that original one, it is permitted to use it ) Pistons, piston pins, and piston rings Free ) Flywheel Free ) Ignition system Free ) Lubricating system Free other than the restrictions defined below. When viewed from above, the oil cooler must not protrude from the vehicle perimeter. If the oil cooler is installed outside the vehicle, it must be positioned below the horizontal plane passing through the wheel rotational center of the vehicle in running order. 5.3) Air intake system Free other than the restrictions defined below. The use of water injection devices, variable valve timing, variable inlet ports, and air intake adjustment devices is allowed only if these devices were part of the original vehicle or the original engine. The use of a variable intake trumpet is not permitted ) Air restrictor 31/45

32 All cars must have either 1 or 2 air restrictor(s) made of metal with a tube(s) having circular section(s) maintained for a minimum length of 3mm. All air admitted to the engine must pass through the air restrictor(s). When all the intake air is forced to stop upstream of the air restrictor(s), engine must be immediately stopped ) Air restrictor diameter Air restrictor diameter must be maintained as specified in the Appendix 2 of this Chapter. Air restrictor diameter must comply with the prescribed value at all time during an event. The JAF may change the air restrictor diameter requirements with notice in advance at any time during the season in order to provide equality of performance ) Supercharged engine The air restrictor must be situated at a maximum of 50mm upstream of the vertical plane passing through the most upstream extremities of the supercharger wheel blade, otherwise in the middle of an airtight and one piece cone of 7 degrees minimum, which is fitted directly to the inlet of the housing. If an air restrictor and the cone are installed as an integrated part, such part must be joined to the housing side of the supercharger without any gap. The JAF may impose restrictions on supercharging pressure with notice in advance in order to provide equality of performance. Air restrictor Integrated part The housing of the supercharger Drawing ) Normally aspirated engine It is obligatory to equip an air box and the air restrictor must be installed to an air inlet of the box. The air box must satisfy the following conditions: 1) It must not exceed 1,000mm x 500m m x 500mm 2) Intake ducts in front of air box are free provided the external appearance of the car is not changed. The internal structure and also the material of the air box are free. 3) When all the intake air is forced to stop while the engine is running, the engine must stop and the air box and those intake ducts in front of it must have sufficient rigidity not to be damaged or failed ) Air restrictor exemptions 32/45