2008 Vehicle Technical Specifications

Transcription

1 Vehicle Manufacturer: Year and Model: Chevrolet ( ) C5 / Z06 Corvette This specifications form was developed by SCCA Pro Racing and will be used by the Series Technical Administrator to establish technical compliance for vehicles competing in the SCCA PRO RACING WORLD CHALLENGE series. Technical Administrator can also use, but is not limited to also using the following items to check compliance: Electronic Parts Catalog (EPC), Technical Information System (TIS), and the FIA/ASN Homologation forms (or equivalent documentation). The specifications within this form include all modifications that have been approved by SCCA Pro Racing specifically for the vehicle model(s) and year(s) listed on this page. The parts, specifications and assemblies used shall be those for the unmodified stock vehicle, those permitted within the Pro Racing Regulations (PRR) and/or within this VTS. If the stock parts, specifications and/or assemblies exceed the performance potential of those approved within this form, then the parts, specifications and/or assemblies used shall meet those listed within this form. Refer to SCCA PRR for rules regarding all vehicle specifications not specifically listed within the VTS. Specifications regarding wheels and tires may be found in Article 3 and Appendix A of the PRR. Specifications regarding brakes may be found in Article 3 of the PRR. Appendix A will list what size restrictor to use if a restrictor is required to be run. When looking for the most current rules, go to and look under the Competitors section for latest Technical Bulletins, Participant Bulletins, and Appendix A. This Vehicle Technical Specification sheet is a permissive document. The exact configuration of any modification allowed within this VTS is subject to the approval of the TECHNICAL ADMINISTRATOR. Note: this form will have measurements in both U.S. Standard and Metric units of measure when practical. U.S. measurements will be in parenthesis. Date Issued: Version Number: 2 Revision Date: Page: 1 of 5

2 1. General Vehicle Description 1.A. Body Type: Coupe 1.B. Engine Location: Front 1.C. Drive Wheels: Rear 1.D. Wheelbase: 2655 mm 1.E. Induction Type: Naturally Aspirated 1.F. Competition Weight: See Appendix A 1.G. Weight Distribution: See Appendix A 2. Engine 2.A.1. OEM Engine Designation: LS-1 / LS-6 2.A.2. Maximum Displacement: 5781 cc (352.6 cu in) 2.A.3. Number of Cylinders: 8 (V-Block) 2.A.4. Rev Limit: See Appendix A 2.A.5. Rev Limit Method: Fuel Cut 2.A.6. Max. Compression Ratio: 12.0:1 2.A.7. Maximum Piston Stroke: 92.0 mm 2.A.8. Restrictors: 2.A.8.a. Percentage Restriction: 20, 25, 30, 35, 40 % 2.A.8.b. Hole Diameter: 67.1, 65.0, 62.7, 60.5, 58.1 mm 2.A.9. Cylinder Firing Order: A.10. Direction of Engine Rotation: Clockwise 2.B. Cylinder Block 2.B.1. Part Number: (GM) 2.B.2. Cylinder Block Material: Aluminum 2.B.3. Maximum Cylinder Bore: mm 2.C. Cylinder Head 2.C.1. Part Number: 2.C.2. Cylinder Head Material: (GM) Aluminum 2.D. Valve System 2.D.1. Number of Valves Per Cylinder: 2.D.1.a. Intake: 1 2.D.1.b. Exhaust: 1 2.D.2. Maximum Valve Head Diameter: 2.D.2.a. Intake: 50.8 mm 2.D.2.b. Exhaust: 39.4 mm 2.E. Intake Port Dimensions 2.E.1. At Intake Manifold Face 2.E.1.a. Height: 82.8 mm 2.E.1.b. Width: Top: 29.2 mm Bottom: 28.4 mm 2.E.2. Intake Port Work Allowed: No 2.E.2.a. Depth From Face: Not Applicable 2.F. Exhaust Port Dimensions 2.F.1. At Exhaust Manifold Face: 2.F.1.a. Height: 33.8 mm 2.F.1.b. Width 41.7 mm (D-shaped) 2.F.2. Exhaust Port Work Allowed: No 2.F.2.a. Depth From Face: Not Applicable 2.G. Piston and Connecting Rod 2.G.1. Connecting Rod Length: 2.G.1.a. Stock: in 2.G.1.b. Approved: in 2.G.2. Reciprocating Assembly Mass: 2.G.2.a. Stock: 1236 g 2.G.2.b. Minimum: 1245 g 2.G.3. Aftermarket Rods Allowed: Yes 2.G.4. Aftermarket Pistons Allowed: Yes 2.H. Camshaft 2.H.1. Part Number: (ASA Profile) or 2.H.2. SCCA Profile Number: 2.H.3. Rocker Arm Ratio: 1.7:1 2.H.4. Valve Actuation: Pushrod 2.H.5. Type of Cam Follower: Hydraulic Roller 2.I. Crankshaft 2.I.1. Part Number: Any crankshaft with OEM dimensions meeting the minimum weight listed. Date Issued: Version Number: 2 Revision Date: Page: 2 of 5

3 2.I.2. Stock Mass: kg 2.I.3. Minimum Mass: kg (before balancing) 2.J. Flywheel 2.J.1. Stock Ring Gear Diameter: mm 2.L. Intake Manifold 2.L.1. Part Number: (GM) 2.L.2. Stock Port at Cylinder Head Face: 2.L.2.a. Height: 81.6 mm 2.L.2.b. Width: 26.9 mm 2.L.3.a. Allow Port Match to Head: No 2.L.3.b. Port Matching Depth: Not Applicable 2.L.4.a. Throttle Body Bore Dia.: 75.0 mm 2.L.4.b. Throttle Body Part Number: (GM-ETC) or (GM-Mechanical) 2.L.5. Number of Throttle Bodies: 1 2.L.6. Butterflies per Throttle Body: 1 2.L.7. Intake Manifold Material: Plastic 2.L.8. Manifold Pieces: 1 2.L.9.a. Intermediate Port Matching Allowed: Not Applicable 2.L.9.b. Depth from Face: Not Applicable 2.M. Required Engine Seal Locations 2.M.1. Valve Cover Seal #1: 2.M.2. Valve Cover Seal #2: 2.M.3. Oil Pan Seal #3: Forward most bolt in center of valve cover. Forward most bolt in center of valve cover. Left, front corner oil pan / timing chain cover bolt. 2.N. Engine Miscellaneous: Cars using the OE, or aftermarket equivalent, mass air flow sensor may reduce base weight by 25 lbs. Solid stem titanium valves may be used provided each valve weighs within 10-grams of the OE hollow stem Valves (OE weights: Intake 72 grams, Exhaust 65 grams). Beryllium seats may be used. Some titanium valve suppliers that have valves meeting these specs are Del West, Manley and Stealth. 3. Drivetrain 3.A. Transmission 3.A.1. Number of Forward Speeds: 6 3.A.2. Manufacturer: Tremec (P/N: ) 3.A.3. Gear Ratios: 3.A.3.a. 1st: A.3.b. 2nd: A.3.c. 3rd: A.3.d. 4th: A.3.e. 5th: A.3.f. 6th: A.4. Gear Shift Pattern: H Pattern 3.A.5. Gear Engagement Synchromesh 3.C. Final Drive 3.C.1. Axle Ratio: 3.73 or D. Drivetrain Miscellaneous Stock gear ratios from C5, or Z06, are permitted as a set. Once the gearbox is upgraded to the close ratios listed above, the OE ratios may not be used again. The Holinger RD6 TC sequential gearbox may be used with the following ratios: 1st 2.296, 2nd 1.593, 3rd 1.230, 4th 1.000, 5th 0.843, 6th Suspension 4.A. Suspension Type: 4.A.1. Front: Double A-Arm 4.A.1. Rear: Double A-Arm 4.B. Suspension Miscellaneous Pratt & Miller bolt-on upper control arms, and control arm mounts, permitted. Fabricated control arms that are dimensionally correct (pick-up points), such as 3R-Racing s arms (p/n: 3RC-5/100) are permitted. 3Rracing s uprights (p/n: 3RC-5/300) and rear toe links (p/n: 3RC-5/400), or similar items, may be used. AFCO Date Issued: Version Number: 2 Revision Date: Page: 3 of 5

4 upper control arms (p/n: and 19006) permitted. 5. Chassis 5.A. See Technical Department for information 5.B. Chassis Miscellaneous When using ACP Composite Roof/A-pillar assembly with Lexan windshield, the OEM aluminum windshield mounting frame may be removed. If the OEM driver s seat mounting apparatus/tubes are not in place there must be two metal tubes running laterally under the drivers seat between the frame rail and a load spreading metal plate. The tubing shall have a minimum wall thickness of and the metal plate shall be at least thick with a backing plate and grade 5 hardware. The driver s seat shall be attached to the required tubes instead of through the chassis floor. When a single tube from each front down tube extends through the firewall to a point at, or beyond, the front shock towers a tube may be used to connect this tube to the chassis in-between the firewall and shock tower. A lateral brace may connect the frame rails between engine and radiator. If saddle fuel tanks are used there shall be an.036 steel, or.059 aluminum, shield protecting the bottom and rear of each tank, including the crossover tube. This shield may be mounted between the floorpan and at the front of the rear subframe. The battery may be located in the OE location at the right rear of the car. The OE, or equivalent, cover must be intact and well secured. 6. Body 6.A.1. Stock Coefficient of Drag: A.2. Total Frontal Area: 21.3 ft 2 6.B. Body Overhang: 2.B.1. Front: 991 mm 2.B.2. Rear: 940 mm 6.C. Stock Body Materials: Fiberglass 6.D. Maximum Body Width: 1918 mm 6.E. Permitted Rear Wing Design: ACP-6700CF (Wings w/ same profile and dimensions, such 3RC-5/200 may be used) 6.F. Body Miscellaneous: Advanced Composite Products: 2 Laguna splitter (p/n:c5/a0003 CF2, or FG2) may be used. B-pillar extension (LH)(p/n:ACP-BPE001), B-pillar extension (RH)(p/n:ACP-BPE002), flared rear fenders (p/n:acp- C5/A0009 & 10), GM body kit (p/n:c5/a0046pkg)(includes R-fascia, doors, hood, deck lid, roof, ¼ panels), Z06 aero skirts (p/n:c5/a0006#7fg), vented hood (p/n: C5/A0050CF), single-piece rear fascia (p/n: C5/A0039-CF) may be used. Front splitter (p/n: TR1001) may be used. Contact Tom Oates Chevrolet for ordering info. An air duct(s) may be installed in the front license plate area. Date Issued: Version Number: 2 Revision Date: Page: 4 of 5

5 Camshaft Profile SCCA Profile Number: Vehicle: C5.1A Chevrolet C5 Corvette Intake Lobe Cam Lift (in) Duration ( o ) Open Close Area BTDC 58.3 ABDC BTDC 49.8 ABDC BTDC 43.7 ABDC BTDC 38.7 ABDC BTDC 34.3 ABDC BTDC 30.4 ABDC BTDC 26.9 ABDC BTDC 23.5 ABDC ATDC 20.4 ABDC ATDC 17.4 ABDC ATDC 3.3 ABDC ATDC 11.6 BBDC ATDC 29.9 BBDC ATDC 60.9 BBDC 5.85 Maximum Lift: Exhaust Lobe Cam Lift (in) Duration ( o ) Open Close Area BBDC 45.0 ATDC BBDC 36.2 ATDC BBDC 29.7 ATDC BBDC 24.5 ATDC BBDC 19.9 ATDC BBDC 15.9 ATDC BBDC 12.2 ATDC BBDC 8.7 ATDC BBDC 5.4 ATDC BBDC 2.3 ATDC BBDC 12.5 BTDC ABDC 28.2 BTDC ABDC 47.3 BTDC ABDC 79.5 BTDC 6.28 Maximum Lift: Permitted Cam Tolerances Camshafts used for this car must meet the specifications above within the following tolerances: Duration at the seat (From lift to lift) +/- 6.5 degrees Duration on flank (From lift to before maximum lift) +/- 4.0 degrees Duration over nose (From before maximum lift up to maximum lift) +/- 6.0 degrees Maximum Lift (This tolerance applies to maximum lift only) +/ in (0.127 mm) Date Issued: Version Number: 2 Revision Date: Page: 5 of 5