Part C Special Technical Requirements C.1 GENERAL Technically identical automobiles with the designation Porsche 911 GT3 Cup (Type 991), built by Porsche AG in a small production run on the basis of the Porsche 911 GT3, shall be used for China GT Only automobiles of Model Year 2014/2015/2016/2017 are eligible to compete including the required modification in accordance to Part D- Attachments shall be authorized. The rebuild of gearboxes and shock absorbers may only be carried out by the Porsche Motorsport Asia Pacific (PMAP) appointed official technical partner. The automobiles must comply with the requirements of these 2017 technical regulations. Technical inspection of the automobile is undertaken by the Technical Delegate. The following special technical requirements apply in addition to the general technical requirement in Part B (B.1 B.12): Everything that is not expressly permitted in this regulation is prohibited. Allowed changes must no result in any infringements of the rules or any changes that are not permitted. C.1.1 General Automobile Description Porsche 911 GT3 Cup (type 991), Model Year 2014, 2015, 2016 and 2017 Concept: Single-seated, near-standard race automobile Based on the 911 GT3 Engine: Aluminum six-cylinder rear-mounted boxer engine Sealed 3,800 cc; stroke 76.4 mm; bore 102.7 mm Max. power: 338 kw (460 hp) at 7,500 rpm Max. rpm: 8,500 rpm Single-mass flywheel Water cooling with heat management for engine and gearbox Four valves per cylinder Sequential multi-point fuel injection Required fuel quality: Minimum 98 octane, unleaded. Dry-sump lubrication Electronic engine management (Bosch MS 4.6) Race exhaust system with regulated race catalytic converter Rear silencer with centered exhaust pipe Electronic acceleration pedal Transmission: Porsche six-speed sequential dog-type gearbox Gear ratios: Ring & pinion gear 14/22 i = 1.571 Final driver 17/41 i = 2.412 1st gear 13/41 i = 3.154
2nd gear 17/40 i = 2.353 3rd gear 19/36 i = 1.895 4th gear 19/29 i = 1.526 5th gear 24/30 i = 1.250 6th gear 34/35 i = 1.029 Internal pressure-oil lubrication with active oil cooling by oil-water heat exchanger Limited slip differential Triple-disc sintered metal race clutch Pneumatic paddle shift system Bodywork Lightweight bodywork with smart aluminum-steel composite construction Welded-in roll cage, in compliance with FIA Homologation Regulations for safety cages Front bonnet with two air inlets for cockpit ventilation and quick fasteners Removable roof section Rescue bar analogue DTM system Modified and widened 911 GT3 fenders Modified rear wheel arches Modified and widened 911 GT3 front-end with spoiler lip
Modified 911 GT3 rear-end with integrated rain light, in compliance with FIA Homologation Regulations Lightweight exterior: - CRP doors with sport-design rear-view mirrors - CRP rear engine lid with quick fasteners - CRP rear wing; adjustable - PC windows and rear side windows with ventilation openings - PC rear window Underbody tray with air routing for brake- and driveshaft cooling in the rear Modified 911 cockpit: - Magnesium sub-frame in light weight design - Ergonomic driver-oriented center console - Switch mask with fluorescent lettering - Steering wheel with quick release coupling, control panel and shift paddles Race bucket seat with longitudinal adjustment: - Homologated to latest FIA requirements - Individual padding system (delivery with size M) Six-point seat belt 100 liter fuel cell (FT3 safety fuel cell) and Fuel-Cut-Off safety valve in accordance with FIA regulations Built-in air jack system (three legs) Suspension: Front axle: McPherson suspension strut, adjustable in height, wheel camber and track Forged struts: - Optimized stiffness - Double shear tie rod connection - Heavy-duty spherical bearings Wheel hubs with center lock Racing shock absorbers, non-adjustable Forged supporting mounts Double-blade-type anti-roll bar Electrohydraulic power steering Rear axle: Multilink rear suspension, adjustable in height, wheel camber and track Forged struts: - Optimized stiffness - Double shear tie rod connection - Heavy-duty spherical bearings Wheel hubs with center lock Racing shock absorbers, non-adjustable Forged supporting mounts Double-blade-type anti-roll bar Brake System Two independent brake circuits for front and rear axle, adjustable by the driver via brake balance system Front axle: Aluminum six-piston racing calipers in mono-bloc design with anti-knock-back piston springs Multi-piece steel brake discs; internally vented and slotted, 380 mm diameter Racing brake pads Optimized ventilation routing Rear axle:
Aluminum four-piston racing calipers in mono-bloc design with anti-knock-back piston springs Multi-piece steel brake discs; internally vented and slotted, 380 mm diameter Racing brake pads Optimized ventilation routing Rims/Tires: Front axle: Single-piece light-alloy rims according to Porsche specification and design with center lock, 10.5J x 18 ET 28 Michelin transportation tyres; tyre size: 27/65-18 Rear axle: Single-piece light-alloy rims according to Porsche specification and design with center lock, 12J x 18 ET 53 Michelin transportation tyres; tyre size: 31/71-18 Electrics: COSWORTH color display ICD COSWORTH electrical system control unit IPS32 Electronic throttle system Fire extinguishing system (extinguishing agent: gas) Battery 12 V, 70 Ah (AGM), leak-proof, placed in the co-driver foot well Alternator 150 A Fan in light weight design Wiper with direct drive Lighting system: - Bi-xenon-headlight - LED daytime running light - LED rear lighting system and rain light Weight: Total weight: approx. 1,200 kg Total length: 4,547 mm Total width: 1,851 mm Total height: 1,280 mm Wheel base: 2,458 mm Colors: Water-based paint Exterior: white C9A Interior: white filler-coat, no clear-coat finish Delivery: September 2015 March 2017 C.2 ENGINES Conformity with Regulations: Each customer is responsible for his car to fully comply with the relevant regulations. This document replaces previously published information. Vehicle cannot be registered for public road use. All data subject to change without prior notice. The engine is sealed at Porsche AG prior to delivery. Automobile with an unsealed engine or with a damaged seal is not permitted to participate in China GT under any circumstances. Any work on the engine that requires the seal to be opened must be undertaken at Porsche AG. An engine change has to be approved in writing by the organiser prior to the change. Engines can be called in at the instructions of the sports stewards. Before the engines are delivered and refitted, a new seal shall be affixed by a Technical Delegate at Porsche AG.
The original screws for fixation of the exhaust system may be replaced by steel bolts and hexagon bolts. Therefore, only the following parts are allowed to be used: 4 pieces of steel bolts M10x70 8.8 part number: 999.062.170.02 4 pieces of hexagon nuts M10 part number: 900.377.011.01 The implementation of this modification has to comply with the photo below: C.3 POWER TRANSMISSION (GEARBOX/ DIFFERENTIAL LOCK) C.4 BRAKES The ramp angle of the differential lock is 52º(pull) and 30º(push). The ramp angles are determined from the axis of rotation (attachment 4). The number of friction plates and the assembly order shall correspond to the image shown in attachment 4, and must not be changed. Automobiles in China GT are only allowed the following calipers: Part numbers: VA 991.351.942.8A HA 991.352.942.8A Brake Calliper Part Numbers: FRONT L/H - 9913514278A R/H - 9913514288A REAR L/H - 9913524278A R/H - 9913524288A Only standard main-brake-cylinders are permitted for the two brake-circuit front axle (17.8 mm). Front axle Aluminium six-piston calipers, one-piece Internally vented brake disc, diameter = 380 mm (according to Porsche specification) Rear axle Aluminium four-piston calipers, one-piece Internally vented brake disc, diameter = 380 mm (according to Porsche specification) C.5 STEERING (STEERING WHEEL/ HUB EXTENSION)
The position of the steering wheel on the front axle control arm is determined by spacer washers with a thickness of 8.5 mm. Part number: 991.341.613.8A No hub extensions are allowed to be installed. The standard longitudinal and height adjustment facility may be used. The steering line 991.347.775.8A of the steering rack must be supported with a damping element 8K0.611.797.E as shown in the picture. Tie rods The replacement of the inner torx screw with part number: 999.073.252.09 by an external hex screw with part number: 900.378.030.01 is not subject to any restrictions. C.6 WHEEL SUSPENSION The suspension may be modified within the scope of the specified setting range. All genuine parts must be retained. The maximum permissible thickness of the spacer washers in the front and rear axle control arms are: Front axle: Rear axle: 18 mm 15mm The trailing arm axle bearing points of the front and back wishbones must be left in the position in which they are delivered. Additionally, the screw positions of the trailing arms at the wishbone bearing points may not be modified (see attachment 5). The wheel base on the left and right side of the automobile must be 2,460 mm +/- 15 mm. The measuring points are the centre of the wheel hub. C.6.1 Anti-roll bars
The anti-roll bars are only allowed to be unhooked provided that no parts are removed in the process. Only the setting options for which the technical specifications have been provided may be used. C.6.2 Shock absorbers/ springs Only the factory-installed Sachs shock absorbers and H&R chassis springs in their original condition may be used. Any rebuild of the shock absorbers may only be done by the PMAP Official technical partner. The following number is stamped on the bump stops of the rear vibration dampers: 0049 5111 0 250. Part numbers: Shock absorber Front axle: 991.343.045.8A Rear axle: 991.333.051.8A Bump stop Front axle: Rear axle: 991.343.677.8A 991.333.677.8A Main spring Front axle 240N/mm: 991.343.531.8C Rear axle 260N/mm: 991.333.531.8C Helper spring Front axle 75/60/45: 996.343.537.90 Rear axle 80/60/60: 997.333.537.90 The rear axle rebound stop must be increased. Therefore the spacer ring of the suspension strut with the part number 991.333.468.8A must be replaced by the thicker spacer ring with the part number 991.333.468.8B C.7 WHEELS AND TYRES C.7.1 Only the version of Michelin tyres approved for the series races may be used for the duration of the competition and the official tests. The tyres for the relevant competition are to be obtained on site from Michelin. There are no specifications for the tyre pressure, but Michelin's recommendations and instructions should be observed. Tyres may only be filled with dried compressed air of atmospheric composition or nitrogen. It is not permissible to refit or rotate the tyres on the rims. In exceptional circumstances (i.e stones trapped between the bead etc), the Technical Delegate may give permission for the refitting of a tyre, but the direction of rotation shall still be maintained. Only tyres with the following specifications may be used: Slick tyres: Dimensions Front: 27/65R18 Porsche Cup S9L or S9M Rear: 31/71R18 Porsche Cup S9L or S9M Wet tyres: Dimensions Front: 27/65R18 P2L Rear: 31/71R18 P2L Michelin is the official tyre supplier for the China GT 2018. All required new tyres should be ordered and paid for prior to the meeting. The tyres are to be obtained from the official Michelin appointed dealer at the race meeting. The details for the official Michelin appointed dealer and the process for ordering and payments will be communicated in a separate bulletin.
Slick tyre allocation for each race event is a maximum of 4 sets: 8 front and 8 rear slick tyres. One set of slick tyres (4 tyres) nominated at the previous Event may be used during free practice at the race event. C.7.2 C.7.3 C.7.4 All tyres must be fitted with valve caps, which must be in place before the cars leave the pit lane and at all times when out on the circuit. There is no limit on the number of wet tyres that may be allocated to a car and used. All wet tyres should be marked by the tyre Scrutineer before the first practice. Practice Competitors are allowed to use 4 slick tyres (1 set) nominated at the previous Event for Practice. C.7.5 Qualifying and Race Tyres may be mounted on rims at any time prior to qualifying, C.7.6 At an official test there is no limit on the number of slick tyres that may be allocated to a car and used. Competitors who do not attend the official test and use their automobile for the first time after the official tests must use new slick tyres. All tyres must be marked by the tyre Scrutineer before the first free practice. C.7.7 C.7.8 C.7.9 All chemical and mechanical treatment of the tyres is prohibited. Tyre warmers are allowed in each practice session, qualifying and race. Damaged tyres due to accident can only be exchanged with the agreement of the PMAP Technical Delegate. If marked tyres are damaged during qualifying, these may be replaced by new ones with the agreement of the China GT Technical Delegate. These tyres must be marked. C.8 BODY AND DIMENSIONS C.8.1 Overall car length and overhang The overall length of the car is 4,547 mm +/- 10 mm. The front overhang is 1,043 mm +/- 10 mm, measured from the middle of the wheel of the front axle to the leading edge of the automobile (first point in the direction of the longitudinal axis, front lip included). The rear overhang is 1,045 mm +/- 10 mm, measured from the middle of the wheel of the rear axle to the rear edge of the automobile (last point in the direction of the longitudinal axis, rear wing excluded). C.8.2 Body, exterior (including windows) The delivery status of the bodywork has to be preserved. C.8.3 Windscreen To protect the windscreen, so called tear-off screens may be attached to the windscreen. The fitting has to be controlled and approved by technical scrutineering and must be removed on request by the Technical Delegate C.8.4 Side and rear windows Only the genuine Porsche 911 GT3 Cup side and rear windows (in accordance with ISC of the FIA, Appendix J) in their original version are permissible. Part numbers: Door windows: L 991.542.511.8A/B R 991.542.511.8A/B Rear side window:
L 991.543.511.8A R 991.543.512.8A Rear window: 991.545.111.8A Rear Window All cars must secure the rear screen using eight hex head bolts and eight nyloc nuts including two washers on each. Please see below image for the locations of the eight bolts. Note : All measurements are +/- 5mm. C.8.5 C.8.6 Passenger compartment/cockpit Seat The seat can be adjusted by removing or adding any upholstery provided the inserts are covered in a fire retardent material. The original mounting (seat rail and bracket) must be retained. Changes require the consent of the Technical Delegate. The maximum allowed upholstery, as indicated, must not exceed 50 mm. The installation and usage of passenger seats during the Official Test Days is not allowed. C.8.7 Ventilation in the passenger compartment Only the factory-fitted ventilation pipe (NACA-intake on the front opening hood) is permissible for cockpit ventilation. The ventilation of the windscreen must not be affected. For additional ventilation of the passenger compartment only the existing original ventilation openings in the rear back windows are permissible. The dimension of the NACA-intake may be changed by taping in order to regulate the air inlet into the passenger compartment.
C.8.8 Roof hatch The automobile has an opening in the roof in order to make using the KED System in the eventual recovery of the driver easier. The roof hatch is located above the driver and with the dimension of the opening 420 mm x 420 mm. The roof hatch is made of plastic and is attached to the roof via four livelocks. C.9 AERODYNAMIC AIDS The original position of the wing section may be changed within the specified scope for adjustment. Masking the central cooler in horizontal line to regulate the water temperature of the engine is allowed, the masking must start from the top to the bottom. Masking of the side radiators for additional control of the coolant temperature is only permitted if the centre radiator has already been completely masked. The masking must be in black. One strip of transparent adhesive tape (max. 80 mm long, 20 mm wide) is permitted as a fixing element on the headlights and the tail lights. Complete masking of the filler flap on the wing is also approved. Furthermore, the teams are allowed to tape over the full area of the headlight lenses with transparent Heli tape, without thereby taping over a slot in the bodywork. Apart from that, taping over of slots in the bodywork and openings is not allowed C.10 ELECTRICAL EQUIPMENT C.10.1 Engine electronic control units Only the Motronic electronic control units coded and sealed by the Organising Committee for the races may be used throughout the entire competition. The Motronic electronic control unit including the complete wiring loom must be used without modifications. The Organising Committee or the Technical Delegate reserves the right to check or exchange the Motronic electronic control or record the engine characteristic data at any time during the competition. The Organising Committee reserves the right to reprogramme the Motronic electronic control units and to reseal the plug-in connector for reading the electronic control units at the start of the competition. It is thus ensured that the status of the programme and data is identical for all participating automobiles. C.11 FUEL SYSTEM Only the fuel system permitted for the Porsche 911 GT3 Cup vehicles of model years 2017, 2016, 2015 and 2014 is allowed to be installed. Fuel in accordance with Article B.11. C.12 LUBRICATION SYSTEM C.12.1 C.12.2 Lubricants Engine Mobil 1 OW40 engine oil is recommended for entrants. All additives are prohibited. Gearbox Mobilube 1SHC 75W90 transmission oil is recommended for entrants. All additives are prohibited. There has to be a minimum of 2.7 litres transmission oil in the gearbox at all times. C.13 MISCELLANEOUS
C.13.1 Seals The following seals are affixed before delivery: Ballast (1x) Engine: Valve cover, left (1x) Valve cover, right (1x) Oil pump, left (1x) Timing gear cover, right (1x) In-/On-board camera (1x) Motronic control unit: connection for electronic control unit wiring loom (2x) Gearbox (3x) Gear housing (1x) Transmission cover LHS (1x) Transmission cover RHS (1x) If the seals and marks are applied to the automobile by the Technical Delegate or Porsche AG, these must not be damaged, changed or reproduced. If the seal on the engine electronic control unit is opened to allow welding work to be carried out, without being requested to do so, the control unit must be taken to the Technical Delegate for another inspection and to be resealed. Before the unit is resealed, the chronology of the work carried out must be submitted to the Technical Delegate The removed seal has to be handed over to the Technical Delegate. If a seal is found missing or damaged, an illegal manipulation will be assumed and an appropriate penalty shall be imposed. Seals that have fallen off during the race or are damaged must be notified to the Technical Delegate in writing no later than one hour after the end of the ParcFermé. C.13.2 Repairs subject to notification requirements C.14 CAMERAS Non-observance of the mandatory reporting regulations If it is established during the technical inspection that seals have been opened without the approval of the Technical Delegate. The Technical Delegate reserves the right to refuse to pass the technical inspection. Only in-board or on-board cameras which have been approved by the Organising Committee are permitted to be used for legal sporting matters and TV purposes. All participants are obliged to fit and use TV cameras assigned by the Organising Committee in the respective car at the defined place according to the standards. Installation shall take place in the team's working awning by trained personnel of the Organising Committee staff. The picture rights belong exclusively to the Organising Committee. C.15 COMMENTS Any permitted changes may only serve the intended purpose. Should problems occur with regard to interpretation of the rules, the Organising Committee shall decide according to the 'essential purpose of the rules'. Moreover, the sports disciplinary bodies also have jurisdiction in such matters. The Organising Committee reserves the right to amend and extend these rules. C.16 LIGHTING EQUIPMENT All lighting equipment must be in working order throughout the competition. The exterior lighting equipment must at least ensure the following functions: Headlights, direction indicators, stop lights, rain light and rear sidelights. For safety reasons, it is obligatory for headlights to produce a white beam. For races run in the daytime, cars must be equipped with yellow headlight covers. Only the use of clear protective film is permitted. All other coloured film is prohibited.
C.17 RADIATORS C.18 RADIO SYSTEM These modifications must not create any aerodynamic downforce. It is allowed to cover the water cooling radiators in accordance with section 1.4.5 of the Technical Handbook. When covering the centre radiator it must be covered starting from the top of the radiator. If the centre radiator is fully covered and needs to be partially uncovered then the covering has to be removed starting from the bottom. It is prohibited to apply any form of writing/logo/sponsor stickers to this covered area. Only black tape is allowed. Only the radio system made available by the Series organiser is approved for use. The driver has to be connected to the radio system during free practice, qualifying and the race and must be able to receive instructions from the Race Director or the Series organiser from the point of leaving the pre-start area until the vehicle is parked in the Parc Fermé. The choice of hardware for radio reception from the Earplug port to the driver is optional, but must be checked and approved by the Technical Scrutineers. When mounting fixed speakers in the driver s helmet, the FIA helmet regulations must be strictly observed. In the case of any ambiguity, the driver/ entrant must produce proof that the components used are suitable for use in the vehicle (fire prevention, etc.). Modifications to the system are not permitted. Extra equipment is only allowed to be coupled with the radio system by the Series organiser. Malfunctions or damage to the system must be reported immediately to the technical scrutineers. The radio system is property of the team and it s the teams job to maintain it. The use of other radio-based information transmission in the vehicle (e. g. telemetry) is forbidden. Communication between driver and team is allowed during every session. Part D ATTACHMENTS D.1 MINIMUM GROUND CLEARANCE, REAR AND FRONT AXLE (Attachment 1)
D.2 DIFFERENTIAL LOCK, RAMP ANGLE (Attachment 2)
Verbotene Konfiguration Modelljahr 2013 / 2014 Forbidden configuration Model year 2013 / 2014 Erlaubte Konfiguration Modelljahr 2015 Permitted configuration Model year 2015 Außenlamelle (Stahl) Pressure plate (steel) Außenlamelle (Stahl) Pressure plate (steel) Innenlamelle (beschichtet) Clutch disk (coated) Außenlamelle (Stahl) Pressure plate (steel) Innenlamelle (beschichtet) Clutch disk (coated) Außenlamelle (Stahl) Pressure plate (steel) Innenlamelle (beschichtet) Clutch disk (coated) Druckstück Thrust piece Kreuzbolzen Cross pin Druckstück Thrust piece Innenlamelle (beschichtet) Clutch disk (coated) Außenlamelle (Stahl) Pressure plate (steel) Innenlamelle (beschichtet) Clutch disk (coated) Außenlamelle (Stahl) Pressure plate (steel) D.3 WISHBONE Innenlamelle (beschichtet) (Attachment Clutch 3) disk (coated) D.4 BALLAST WEIGHTS (Attachment 4)