General Regulations for Series run on Circuits / Automobile Sport
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General Regulations for Series run on Circuits / Automobile Sport Part 2 – Technical Regulations (v4 / 02.12.2021) Porsche Sprint Challenge North America Foreword: United States Auto Club, hereinafter called USAC, is hosting the Porsche Sprint Challenge North America for 2021. Organisation: USAC Porsche Sprint Challenge North America 4910 W. 16th Street Speedway IN 46224 USA
Table of Contents General Regulations for ........................................................................................................................................................... 1 Series run on Circuits / Automobile Sport ......................................................................................................................... 1 3. Eligible Cars ...................................................................................................................................................................... 5 4. Driver Safety Equipment ............................................................................................................................................... 5 5. Technical Inspection ...................................................................................................................................................... 7 6. Mandatory Safety Requirements .............................................................................................................................. 10 7. Eligible Engines & ECUs .............................................................................................................................................. 13 8. Drivetrain ......................................................................................................................................................................... 14 9. Suspension...................................................................................................................................................................... 15 10. Dash and Data Collection ............................................................................................................................................ 17 11. Fuel .................................................................................................................................................................................... 17 12. Windows .......................................................................................................................................................................... 18 13. Brakes and Brake Pads ................................................................................................................................................ 18 14. Weight .............................................................................................................................................................................. 19 15. Wheels ............................................................................................................................................................................. 19 16. Tires .................................................................................................................................................................................. 19 17. Miscellaneous................................................................................................................................................................. 20 18. APPENDIX 1A - Platinum Class GT3 Cup 991.2.................................................................................................. 22 19. APPENDIX 1B - Gold Class GT3 Cup 991.1 .......................................................................................................... 23 20. APPENDIX 2A - Silver Class 718 GT4 Cayman (Type 982) ............................................................................. 24 21. APPENDIX 2B- Silver Class 718 GT4 Cayman (Type 981) .............................................................................. 28 22. APPENDIX 3 - Minimum Ground Clearance GT3 Cup ........................................................................................ 31 23. APPENDIX 4 - Minimum Ground Clearance GT4 ................................................................................................. 32 24. APPENDIX 5 - Differential Graphics Platinum/Gold ........................................................................................... 34 25. APPENDIX 6 - OE Recaro Seat Padding Graphic ALL Classes ......................................................................... 35 26. APPENDIX 7 - Window Net Detail All Classes ...................................................................................................... 35 27. APPENDIX 8 - Approved Ballast Location All Classes ........................................................................................ 36 28. APPENDIX 9 - Mandatory Radio Frequencies ....................................................................................................... 37 29. APPENDIX 10 - Equivalence Formula ..................................................................................................................... 38 30. APPENDIX 11 - Identification of original Porsche windscreens ...................................................................... 39 31. APPENDIX 12 – Tires................................................................................................................................................... 40 32. APPENDIX 13 – Timing Transponder Position ..................................................................................................... 43 33. APPENDIX 14 – Underbody cover (991) ............................................................................................................... 44 Page 2 of 44 02.12.21 v 04.0
2.1 Series Technical Regulations Summary of the eligible groups/classes The Porsche Sprint Challenge North America is an official Porsche AG one-make Series with multiple group/class classifications. Only cars of the type/model: • Porsche 911 GT3 Cup, type 991 II (a special series produced by Porsche AG), of the model year 2017- 2020 • Porsche 911 GT3 Cup, type 991 I (a special series produced by Porsche AG), of the model year 2014- 2016 • Porsche 718 Cayman GT4 Clubsport (Trackday, Competition or MR) of the model year 2019 – 2021 • Porsche 981 Cayman GT4 Clubsport of the model year 2016 which fully comply with these Regulations as well as the appropriate Porsche Technical Manual are eligible to participate. A change of cars must be applied for in writing by the competitor and must be approved in written form by the Stewards prior to the change. The decision to approve a change of car is at the absolute discretion of the Stewards. Where the Stewards accept such an application, that acceptance may be given subject to specific conditions. Where the replacement of a car is accepted after Qualifying it will normally be on condition that the car starts the race from the back of the grid. Cars submitted by Porsche AG or USAC may deviate from the Technical Regulations for development purposes. The deviations shall be referred for approval by USAC before the car is used and shall not involve any safety-critical modifications. 2.2 Principles of the Technical Regulations In accordance with: ☒ Art. 251 and 277 (Group EII-SH) of Appendix J (FIA ISC) ☒ These Technical Regulations ☒ Technical manuals of the eligible cars ☒ Technical information of Porsche Motorsport North America ☒ Software information of Porsche Motorsport North America ☒ Spare parts catalogues of the eligible cars Should there be any discrepancy between the provisions of these Technical Regulations and any relevant Technical Manual, Technical Information, Software Information or Parts Catalogue, then these Technical Regulations will take precedence. Any requirements specified in a Technical Manual, Technical Information, Software Information and/or Parts Catalogue may be updated by Porsche Motorsport North America. For Software Information, only the latest version is valid but Setups (based on the latest version) may be varied within the parameters allowed by Porsche Motorsport North America. Any requirements may be varied for any specific event by USAC at that event. Page 3 of 44 02.12.21 v 04.0
2.3 Porsche Technical Manuals and Updates Teams must subscribe to and always refer to PMRSI - Porsche Motorsport Racecar Service Information for up-to- date information about your racecar. https://motorsport.porsche.com/ 2.4 General/preamble Everything that is not expressly permitted in these Regulations is prohibited. Permitted modifications must not result in any illegal modifications or infringements of the Regulations. All cars must be original Porsche Cup cars as delivered by Porsche and the VIN number must reflect this. No aftermarket conversions to cars are permitted. Except where specifically permitted herein, there are no changes permitted to the cars from their original specifications. There must be no welding, cutting, machining, drilling, acid dipping or other chemical treatment of the car to change its mechanical properties. Any change to the car that is not specifically permitted in the Technical Regulations is expressly prohibited. Except where specified, all parts must be stock, original equipment (OE) and in the original location as delivered. This means that they must be the Porsche designated parts that were as the car was delivered and be listed in the Porsche parts catalog for that car for that model year. For example: Water and oil radiators, ducting, bodywork, suspension components, wheels, driveline, engine, and components etc. Transposition of parts from one model year to another is not permitted except as specified herein. Modification of any supplied part, modifying their mounting or mounting position is prohibited. It is permitted to carry out work on a vehicle which is part of the regular maintenance of the vehicle or which serves for the replacement of parts that have become defective as a result of wear or accident. The utilization of components manufactured by Porsche for other vehicles is prohibited. Standard fasteners such as nuts, bolts, washers, circlips, spring washers, split pins, etc., may only be replaced with original Porsche spare OE parts. In case of threaded fasteners, the type, size, and pitch of the thread must not be changed. If, in the sole judgment of the Technical Director, the cars do not meet the spirit or intent of these Technical Regulations, he may order them to be corrected to be in compliance prior to any further participation in the Event. Any waiver of any technical requirement by the Technical Director shall specify the length of time the waiver shall be in force and shall not constitute an ongoing waiver, or a waiver for any other cars for the same issue. Limits of Adjustments: Except as may be specified or permitted in these Technical Regulations, the limit of any adjustment on the car shall be the range of adjustment permitted by the stock parts using the stock fixation points Page 4 of 44 02.12.21 v 04.0
as supplied by the manufacturer. No additional adjustment points within or outside the range may be created by altering parts from their as manufactured configuration. It is the responsibility of the participant to read, understand and comply with The Technical Regulations. Failure to do so will not provide any relief from The Technical Regulations. Competitors are encouraged to enroll in the PMRSI bulletin program by contacting PMNA. The most current PMNA technical manual and parts catalogue (as found on PMRSI) are considered an appendix to this rulebook, unless otherwise stated. Part numbers and best practices that pertain to a specific vehicle model, type and year will be referenced as part of the Technical Inspection process. 3. Eligible Cars 3.1 Cars shall be separated into classes Platinum Class Porsche 991.2 GT3 Cup Cars, Model Years 2017-2019 Gold Class Porsche 991.1 GT3 Cup Cars, Model Years 2013-2016 Silver Class Porsche 718 GT4 Clubsport MR Cars, Model Years 2019-2020 with Sprint Challenge Modification prescription as approved by PMNA Porsche 718 GT4 Clubsport Competition Cars, Model Years 2019-2020 Porsche 718 GT4 Clubsport Trackday Cars, Model Years 2019-2020 with Sprint Challenge upgrade kit sourced from PMNA Porsche 981 GT4 Clubsport Competition Cars, Model Years 2016 with Sprint Challenge Modification prescription as approved by PMNA 3.2 All bodywork must remain stock OE and no alternate parts (except as provided for herein) are permitted. No unauthorized modifications are permitted to the bodywork. 3.3 Under extraordinary circumstances, a competitor may apply to the Race Director and Technical Director, who shall consult with the Series Director, USAC, for permission to replace an irrevocably damaged chassis tub with another of equal specification or another car not currently entered in the event. Any decision regarding the approval or non-approval of any replacement/substitution is not subject to protest or appeal. 4. Driver Safety Equipment Driver equipment must be always worn whilst the driver is seated in the car in the pre-grid area, the pit lane and on the track. It is compulsory to wear overalls in compliance with the FIA 8856-2000 or FIA 8856-2018 standard as well as underwear (with long sleeves and legs), balaclava, socks, shoes, and gloves in compliance with FIA Regulations 4.1 Drivers must wear full coverage helmets of recognized high quality and which include a face shield. Drivers must use helmets that satisfy FIA standard 8859-2015, 8860-2010 or 8860- 2018 or Snell SA2015. Modification is prohibited (drilling of holes, etc.) and shall void the homologation. Page 5 of 44 02.12.21 v 04.0
4.2 Drivers must have the “Eject Helmet Removal” kit, the Stand 21 “Lid Lifter Balaclava” or the ROUX helmet removal system as installed by the manufacture, in their helmets. 4.3 All drivers must wear overalls, gloves, underwear, balaclava, socks, and shoes homologated to the FIA 8856- 2000 or SFI 3.2A/5 standard, required. • Regardless of the number of layers of a suit, fire retardant NOMEX® or Carbon-X underwear is mandatory. • While any manufacturer’s items may fail inspection due to condition over time, FIA homologated items shall no longer be valid for use after December 31st of the calendar year ten (10) years after the manufacture date shown on the FIA label; or after December 31st of the year of expiration shown on the FIA label 4.4 Drivers must wear a Frontal Head Restraint (FHR) that is approved according to FIA standard 8858-2002 or 8858-2010. Drivers are strongly encouraged to use helmets with tether-anchorages fitted by the manufacturer as original equipment. Homologated tethers identified by a FIA 8858-2002 label are required and must not be used beyond the 31st day of December in their manufacturer’s declared year of expiration. 4.5 Sternum straps are not allowed for use with the HANS due to possible interference issues. HANS-specific two- inch hybrid shoulder straps must be used in conjunction with this system providing they meet harness certifications from FIA, SFI 16.1, or SFI 16.5. 4.6 Any HANS device must have a Silver and Blue SFI 38.1 Sticker and/or a Silver and Black FIA 8858-2002/ 2010 sticker. The SFI sticker is punched with month and year. 4.7 Head and Neck Restraint Devices which only carry a Black FIA 8858-2002/ 2010 sticker (no SFI sticker) must have the tethers replaced five (5) years after the date of manufacturer. 4.8 Head and Neck Restraint Devices which are certified to SFI Spec. 38.1 must be inspected and re-certified every five (5) years, effective January 1, 2012. The device must be sent back to the Original Manufacturer for inspection after five (5) years from the date of manufacture punched out on the label. When a device is determined by the original manufacturer to be acceptable for continued use, a new SFI 38.1 conformance label marked with the inspection date will be affixed and the device will be valid for use for another five (5) years from that date. 4.9 Any head and neck restraint system must be inspected after a serious incident. If any cracking, delaminating or elongation has occurred, the unit must be replaced. 4.10 Devices that meet or claim to meet SFI or FIA specifications but do not actually carry an SFI or FIA certification sticker are not approved. 4.11 Cooling system: A cooling system with cooling vest may be used. The installation according to the manufacturer’s instructions is the sole responsibility of the participant. Prior to installation it must be Page 6 of 44 02.12.21 v 04.0
approved by the Technical Scrutineers. The installation according to the manufacturer’s instructions is the sole responsibility of the participant. A. Driver cooling systems must use non-flammable refrigerant (e.g., R134a, water) B. The system must be mounted in the passenger seat area adjacent to the authorized ballast location. C. The mounting may serve no purpose other than retaining the cooling system in the event of a collision D. All driver cooling system components must be securely mounted using metal hardware and be able to withstand an impact of 30G. E. The use of open hook strap and loop fasteners (Velcro) is prohibited. 4.12 Drivers’ complete safety equipment must be presented at Technical Inspection 5. Technical Inspection Competitors are obliged to present their cars for Technical Inspection at the request of the series Technical officials, at any time during the event. Failure to do so may result in penalties up to and including exclusion. Each entered car must be inspected and approved by the Technical Director or their delegated assistant(s) before it will be allowed to participate in competition or qualifying. There will be a sign-up sheet for Technical Inspection appointments. At the first event, signups will be taken on the “first to show up” basis. At subsequent events sign up requests will be scheduled. No expressed or implied warranty of safety shall result from this inspection or approval. It is always solely the responsibility of the Entrant to have their car free from mechanical defects and in safe racing condition. Cars damaged or altered after they have been approved at inspection are subject to re-inspection and approval. USAC officials will make the final decision on the safety and eligibility of an accident-damaged vehicle. Major body components must be maintained in normal position throughout the competition. Questionable cars are subject to approval by the Technical Director. Cars shall present a neat, clean, and professional appearance. 5.1 Technical Inspection (Scrutineering) 5.1.1 USAC at its sole discretion, retains the right to impound any car for Technical Inspection at any point in the Event and in case of doubt, may retain any car after the Event until such matters have been resolved. Such Technical Inspection may include the disassembly of various parts of the car, including the engine. Competitors accept that in order to complete such inspection, the mandatory seals may be broken, and it is Page 7 of 44 02.12.21 v 04.0
the sole responsibility of the competitor to have any broken seals replaced prior to further competition. Failure to comply may result in Exclusion. 5.1.2 The timing, location, method and type of car inspection, and the number of vehicles to be inspected at any Event will be determined by the Technical Director. 5.1.3 When instructed by the officials to go to the inspection (Impound/Parc Ferme) area, cars must proceed directly and without delay, with a team representative. A car not driven directly and immediately to Impound is subject to penalty. No Data downloads or tire pressure checks allowed in pit lane. The car may not be touched by the team representative(s) until directed by a series Technical official. 5.1.3.1 A team representative(s) must be present at Impound/Parc Ferme to be informed of any decisions taken regarding possible technical checks. Three (3) team representatives’ maximum per car are permitted at any time unless otherwise directed by a series Technical official. 5.1.3.2 Team equipment is prohibited in Impound unless otherwise directed by a series Technical official. 5.1.3.3 Computers and/or electronic equipment are prohibited in Impound/Parc Ferme unless otherwise directed by a series Technical official. 5.1.4 It is the responsibility of the Driver or Entrant to prepare a car for inspection when requested to do so by the Technical Director or their assistant(s). Any expense incurred, except in the case of a protest, shall be the liability of the Entrant. Preparation of a vehicle for inspection must be performed in a timely manner as determined by the Technical Director. Any part that does not comply with these Technical Regulations may be indefinitely retained by USAC. 5.1.5 Admittance to any area in which inspections are being made is controlled by the Technical Director. 5.1.6 Each car entered must submit to Technical Inspection during scheduled hours. • At each event all vehicles will be given a schedule time for a compliance inspection of their vehicle (see Article #5) • b. All driver safety equipment (fire suits, helmets, HANS device, helmet lift systems etc.) will also be inspected for compliance. • c. A minimum of 2 team members and the Driver are required at Technical Inspection. 5.1.7 Measurements under these Technical Regulations: a. Both metric and English dimensions may be given. In such cases, when the two systems do not equate exactly, measurements for compliance during inspection will normally use the system most advantageous to the Entrant. Page 8 of 44 02.12.21 v 04.0
b. The Technical Director may establish tolerances for measurements taken during inspection; may require components on the car to fit USAC templates, fixtures; may require USAC monitoring/data collection devices to be fitted to a car. 5.1.8 Appearance: Clean and neat, no old damage. 5.1.9 Identification numbers must be placed on both sides, front and rear bumper. And must be legible to the satisfaction of the Race Director. Specific requirements may be provided in Event Supplementary Regulations. 5.1.10 Fluid Leakage: Not allowed. 5.1.11 Driver Safety Equipment: see section 4. 5.1.12 Compliance with series sponsor advertising requirements is mandatory. 5.1.13 Mandatory Stickers: All stickers must be applied in accordance with these Regulations prior to participation in the first on-track session and must comply with the standards established by USAC for the Porsche Sprint Challenge North America Series. Page 9 of 44 02.12.21 v 04.0
6. Mandatory Safety Requirements 6.1 OE belts are required. Competitors are responsible for ensuring that any seat, seat belt and mounting are compatible, properly installed, appropriate and safe for competition. USACLLC. may reject, at its sole discretion, any system that either does not meet the requirements or appears to be defective or inappropriate in any way. No warranty of safety, express or implied, shall result from inspection or approval of any system by USAC. Shoulder harness belts must be crossed for HANS device when not mounted directly behind the seat. 6.2 FIA CERTIFICATION - FIA harnesses have tags printed by each manufacturer. FIA harness certifications are good for a period of 5 years from the date of manufacture. FIA harnesses may be used until December 31st of the year printed (or stamped) on the tag. There should be one FIA tag on each element of the harness. For example, a harness FIA-tagged with an expiration year of 2018 would expire and the end of December 2018. 6.3 Stock OE seats are required 6.4 Seats – Reference Class/Car specific Appendix and Technical Regulation 6.4.1 OE/Recaro seat as supplied from Porsche and within FIA expiration limits. 6.5 Nets - Reference Class/Car specific Appendix • Cars must use the Safecraft bullet release on left side net in conjunction with the required Porsche Motorsport mounting kit. Welding to the roll cage is prohibited. • Installation of the net must be in contact with the head support and attached slightly inboard at the rear. Net must be installed as described in the Technical Manual • The upper strap of the net must be at or above the center of gravity of the helmet of the driver of the car. • The net(s) must be dated by the manufacture and must be replaced per the manufacturer’s specifications. 6.5.1 The installation of an "inside" or right-side net is required per the car specific rules in the respective Technical Manual. • Only safety nets meeting FIA 8863-2013 or SFI Spec 37.1 are permitted. • Horizontal webbing shall face the driver, providing the smoothest surface for the helmet. • Approved release mechanisms are the Safecraft bullet style, and approved FIA 8863 systems 6.6 All cars must be equipped with two master electrical circuit breakers, one accessible from inside (accessible by the Driver when normally seated and fitted with the mandatory safety harness), and the second outside the car, that control all electrical power (except electrically actuated fire systems). Page 10 of 44 02.12.21 v 04.0
The preferred outside location is the Drivers side cowl area. The circuit breakers must be clearly marked by a spark in a blue triangle. 6.7 All cars must have at least two operating red brake lights and two taillights. Amber brake lights will not be permitted. (During a competition, the Race Director may accept one functioning headlight, one functioning taillight and one functioning brake light due to damage or equipment failure). 6.8 Class/Car colors on the rear wing end plates and side mirrors are required. 6.8.1 Class/Car colors for head lamp covers are required: Class Headlamp Covers Side Mirrors/ Rear Wing End Plates Platinum Clear Red - C:5 M:100 Y:85 K:0 Gold Yellow Black - C:75 M:68 Y:67 K:90 Silver Clear Yellow - Pantone 116-C Reference: 2021 PSCNA Regulations Part 3 – Attachments for PMS colors Head lamp covers are available from Laminx - Call Jeff at 706-955-0677 or email jeff@lamin-x.com for precut kits. A. Two external OE rear-view mirrors must be installed. Minimum dimension of each external mirror: 100 cm2. An additional Longacre or equivalent 14” or 17” center mount interior mirror is allowed. Mirror must be mounted using metal hardware and be able to withstand a 30G crash B. Mounting method is subject to USAC approval. 6.9 Safety fuel cell meeting FIA Spec FT-3 6.10 Hoods, deck lids and movable body sections must be secured with OE supplemental pins or fasteners. 6.10.1 Supplemental pins used to secure movable body sections (such as hoods, doors, fenders, lids, and removable tops) must have attaching cables to prevent accidental loss of pin. 6.11 No concealed pressure type containers, feed lines or actuating mechanisms are permitted, even if inoperable. 6.12 A fire suppression system is required and must be always in certified working order. The on-board fire suppression system must be Porsche stock or of a size and an approved extinguishing material that is in accordance with the FIA Sporting CODE, Appendix J, Article 258A.15.1, or equivalent USAC approved equivalent. Trigger must be marked with a red circle with the letter "E" and be operable by the Driver and from outside the car. Outlets must be directed into the Driver, engine, and fuel compartments Page 11 of 44 02.12.21 v 04.0
6.13 In all cases, the Driver must be able to easily exit the car through both the Driver side and the passenger side in an emergency. 6.14 An on-board starter and energy source must always remain functional, except when deactivated in an emergency by the master electrical circuit breaker. Page 12 of 44 02.12.21 v 04.0
7. Eligible Engines & ECUs 7.1 The engine must be stock. As delivered from PMNA or Porsche AG. 7.2 The engine must be originally sealed by PMNA or Porsche AG. 991.1 cars have engines approved and/or sealed by USAC 7.3 Engines must remain sealed and retain all markings affixed by PMNA or Porsche AG. 7.4 The competitor is responsible for the state of the seals and their presence at all times. 7.5 Missing or deteriorated seals will be considered an infringement of these Regulations. 7.6 All repairs and internal maintenance operations must be performed by PMNA. Any intrusion into the engine is forbidden. 7.7 Engine oil: Mobil 1 engine oil as specified in the Technical Manual or Technical information. • Engine oil additives are strictly PROHIBITED 7.8 Replacement of the engine must be reported immediately to the Technical Director in writing. If the engine is changed following Qualifying, the car must start the race from the back of the grid. 7.9 Engine Control Units OE as supplied by PMNA or Porsche AG. 7.10 Only the stock Engine Control Units (ECUs) with PMNA programming are permitted. Tampering with or re- programming of the ECU is strictly prohibited. Except as provided for herein, no additional electronics may be installed between the ECU and the engine. The wiring harness must remain stock. 7.10.1 ECUs may be sealed to the connectors at Technical Inspection Tampering with or breaking the affixed seals is prohibited. Only Series officials or authorized Porsche Motorsport technicians may break the seals, which must then be replaced by the Series. 7.10.2 ECUs are subject to random seizure and replacement at any time by Series officials. 7.10.3 Authorized Porsche Motorsport and USAC officials may access and inspect the ECU programming at any time during the Event. Page 13 of 44 02.12.21 v 04.0
8. Drivetrain 8.1 Transmission/Gearbox – As delivered and sealed by PMNA or Porsche AG. 8.1.1 991.1 Type cars may have gearboxes approved and/or sealed by USAC 8.1.2 Transmission gear oil: • Reference Class/Porsche Technical Manual • All transmission gear oil additives are strictly PROHIBITED. 8.1.3 Transmissions may be sealed at Technical Inspection. Tampering with or breaking the affixed seals is prohibited. Only Series officials or authorized Porsche technicians may break the seals, which must then be replaced by the Series, PMNA, or Porsche AG. 8.1.4 Gear Ratios • Reference Class/ Porsche Technical Manual 8.2 Differential - Stock OE. • Reference Class/Car Technical Regulation • Torque break testing at the discretion of the Technical Director at events. • Must be sealed together with the transmission by PMNA, Porsche AG or Series Officials. 8.3 Clutch – Stock OE. 8.4 CV Joints and Axle – Stock OE. 8.5 Gear Change • Reference Class/Car specific Technical Regulations and Porsche Technical Manual Page 14 of 44 02.12.21 v 04.0
9. Suspension 9.1 May be adjusted within existing tolerances except where these Regulations specifically prohibit. All original parts must be retained in their original mounting positions. 9.2 Shock Absorbers (dampers) • Reference Class/Car specific Technical Regulations and Porsche Technical Manual 9.3 Anti-Roll Bars • Reference Class/Car specific Technical Regulations and Porsche Technical Manual o Cars must use stock OE Front and Rear Anti-Roll Bars. o May be disconnected but no parts removed. o May be adjusted using only OE range of adjustment holes. 9.4 Springs • Reference Class/Car specific Technical Regulations and Porsche Technical Manual o Stock OE main and helper must be used. All parts must be retained in their original mounting positions. 9.5 Ride Height • Reference Class/Car specific Appendix and Technical Regulation 9.5.1 Ride height of vehicle is measured “ready to race” including driver’s weight and Dry-Type (slick) tires. The ride height must only be changed within the existing OE adjustment range. 9.5.2 Ride height may be measured at any time during the Event. The steering wheel must be straight when measuring ride height. 9.5.3 Ride height is measured with required Dry- Type (slick) tires with a tire pressure of 29 psi ± 1.5 psi. 9.5.4 Ride height is measured for the front axle at: See Class/Car specific Appendix Technical Regulation 9.5.5 Ride height is measured for the rear axle: See Class/Car specific Appendix Technical Regulation 9.6 The trailing arm axle bearing points of the front and rear wishbones must be left in the Stock position. The screw positions of the trailing arms at the wishbone bearing points may be altered within Stock range of adjustment only. Page 15 of 44 02.12.21 v 04.0
9.6.1 Lower control arm: All components of the lower control arm including trailing arm trailing arm bearing mounting position must remain in original OE position. 9.7 Suspension Adjustment: The suspension may be adjusted within the scope of the specified OE settings. All genuine OE parts must be retained without modification. 9.8 The maximum spacer washer thickness in the front and rear axle control arms are: • Reference Class/Car specific Appendix Technical Regulation 9.9 Camber/ Tire Pressure • Reference Class/Car specific Appendix Technical Regulation • Camber and/ or Tire pressure guidelines may be communicated by the tire manufacturer or series officials at any time during an event. 9.10 Wheelbase: Measured from the center of the Front hub to the center of the Rear hub at Ride Height • Reference Class/Car specific Appendix and Technical Regulation Page 16 of 44 02.12.21 v 04.0
10. Dash and Data Collection 10.1 Reference Class/Car specific Appendix Technical Regulation 10.2 All vehicles must utilize stock OE dash and data logging system as supplied with vehicle. No substitutions are permitted. 10.3 No additional displays are allowed on any vehicles 10.4 Data collection permitted, however: • Permitted sensors are those listed in Porsche technical manual: The sensors delivered on the car from Porsche AG, PMNA, are the only ones allowed. No additional sensors • GPS sensors are permitted. • All other sensors are prohibited, including, but not limited to shock pots. No other sensors are permitted, connected, or disconnected, attached to the car. • Wireless (radio, IR, mobile device, or any other method) transmission of telemetry data to or from the car is prohibited. 11. Fuel 11.1 All cars must use unleaded fuel as prescribed by USAC • The only allowed fuel is: VP Racing Fuels - C9 11.2 All additives are prohibited. Fueling and refueling of the cars on pit lane during free practice, qualifying and the race is forbidden. 11.3 Chemical changes to the fuel are forbidden. 11.4 The Technical Scrutineers shall be entitled to take fuel from a participant’s car at any time during the event. At any time of the event until the end of the protest deadline (subject to removal of fuel for the weighing procedure), the competitor must ensure that a minimum amount of 2 kg of fuel can be taken from the corresponding removal point (fuel removal valve) in the luggage compartment. If the Technical Scrutineers order that a car be defueled (for example to check the minimum weight of the car without residual fuel), a fuel sample must be taken prior to defueling the car. 11.5 Any fuel operations must be performed outside the team tent. All personnel working in this area must wear full fireproof clothing (including shoes, gloves, googles, balaclavas, etc.). The car and all equipment must be Page 17 of 44 02.12.21 v 04.0
grounded to earth properly and at least two 9kg ABC Dry Powder or alternatively two 5kg CO2 fire extinguishers with stand-by personnel (not involved in any fuel operations) must be present in this area. Under no circumstances must members of the public, competitors, team guests or unauthorised personnel be permitted in this area at any time during the fueling operation; it is the responsibility of the team (entrant) to ensure that such persons are excluded from the area. 11.6 Any work requiring the fuel cell to be opened may only be performed after all fuel has been completely removed from inside the fuel cell and with appropriate protection and fire extinguishers being present at the respective workplace. 11.7 Smoking and hot works are prohibited when any operation involving fuel, or the fuel cell is in progress. 12. Windows Reference Class/Car specific Appendix 12.1 Front and rear windows must remain stock OE. Damaged or Cracked windshields must be approved by the Technical Director prior to track use. 12.2 Side door windows must remain stock OE, with the following exceptions: • A NACA duct may be installed on the side window for the purpose of cooling the driver as long as no modifications to the window except for required mounting hardware are made. Maximum of 1 per side with 2 ducts permitted per car. Ducts must be translucent. 13. Brakes and Brake Pads 13.1 Reference Class/Car specific Appendix 13.2 Porsche OE brake systems, including calipers, disc’s, master cylinders, pads and fluid must be stock OE or equivalent same-manufacturer parts as delivered for the model year of the car. 13.3 Cars must utilize the stock OE master cylinder(s) in the stock OE position(s) (front and rear). Page 18 of 44 02.12.21 v 04.0
14. Weight 14.1 At all times during the Event, the minimum weight of car, with driver properly attired in required racing equipment will be as follows: • Reference Class/Car specific Appendix 14.2 Ballast • Any ballast must be carried in a PMNA ballast box. Using only original Porsche ballast components. The ballast must be installed in the designated fixing points in the position of the passenger seat area. This is the only approved location for ballast to be added. • No weight may be removed from the stock structure of the car and placed in the ballast box. Ballast box and weight plates must be purchased from PMNA. 15. Wheels OE as delivered 16. Tires 16.1 The specified (spec) tire of the Series is the Yokohama “ADVAN A005 Slick” and the “ADVAN A006 Wet”. Tires for the Series may only be obtained from the authorized distributor: 16.2 Tires used during any official Event session must be the spec tire of the Series. Allowed to purchase ate each event are three (3) sets for Platinum and Gold class, and two (2) sets for Silver class, of Dry tires “Slicks” for a two (2) race event. All tires for the event to be used for Qualifying and Race must be scanned by series officials. Practice session tires do not require scanning. Replacement tires must be approved by the Technical Director. 16.3 The number of wet tires used during an Event is not limited; however, competitors must use only the approved Yokohama wet tire. Tires are subject to inspection for compliance at any time, at the option and sole discretion of the Technical Director. 16.4 Tire warmers are prohibited; grooving of or otherwise modifying dry or wet tires is prohibited; Chemical treatment of tires is prohibited; tire pressure control valves are prohibited. 16.5 Any action designed to alter the tires as supplied, or to use alternate tires, is prohibited. Page 19 of 44 02.12.21 v 04.0
17. Miscellaneous 17.1 Towing eyes Front and rear towing eyes supplied with the car must be properly mounted and marked by a red “Tow Arrow” insignia. 17.2 Steering wheel OE as delivered 17.3 Exhaust • Reference Class/Car specific Appendix and Technical Regulation The exhaust system, starting from the manifold will be modified completely with the parts listed in the valid parts catalogue for the respective car and model year to the version “Exhaust Tailpipe Open xx” (general linguistic usage as “Supercup exhaust system”). 17.4 In-Car Cameras • Mandatory. The following is recommended: VBOX Video HD2 • Single camera systems must be mounted facing forward, in the center of the car, behind the driver. Multiple camera systems must include both the driver and forward-facing center field of view. Mounting directly to a Roll Bar or with GoPro style glue on mount is required. No suction cup mounts are allowed. • Teams may only connect to the “CAN Option/Sensor” connector (DTM 06-12 SA) for data video overlay function in 991 Cup cars • Camera system must be mounted with metal hardware and be able to withstand a 30g impact. • USAC has the right to impound footage from competitors at the discretion of the Race Director at any time during the event. • Cameras must be able to record a complete race distance. 17.5 Pit to Car Voice Radios • Are required in all phases of competition. • Teams are required to register their frequency as detailed in the Appendix. • All competitors are required to monitor USAC Race Control frequency, as detailed in the Appendix • At all times that the Car is on the racetrack, a minimum of one (1) team member in the Pit Box must have radio communication with the Driver. At all times during a Session, a minimum of one (1) team member in the Pit Box must monitor the published Race Control frequency. 17.6 Battery: Stock OE • See Car Specific Parts Catalog for specific legal battery • Must remain in stock location. • Must be securely mounted. Page 20 of 44 02.12.21 v 04.0
17.7 Wheelbase • Wheelbase may be measured; this measurement will be from the center of the rear hub to the center of the front hub at Ride Height. 17.8 Transponders • Transponders must be mounted inside the front right fender well. 17.9 Driver Comfort Systems: A. A drinking system may be used. Installation needs to be fixed using metal hardware and be able withstand a crash of 30G B. A cooling system with cooling vest and or helmet air may be used. The installation according to the manufacturer’s instructions is the sole responsibility of the participant 1. Driver cooling systems must use non-flammable refrigerant (e.g., R134a, water) 2. The system must be mounted in the passenger seat area adjacent to the authorized ballast location. 3. The mounting may serve no purpose other than retaining the cooling system in the event of a collision 4. All driver cooling system components must be securely mounted using metal hardware and be able to withstand an impact of 30G. 5. The use of open hook strap and or loop fasteners (Velcro) is prohibited. 17.10 Aerodynamic Aids • The use of tape or any material to cover the radiator openings is prohibited. Taping over of body slots and openings is not allowed. • Except for what is stated in section V15.10 5.2.7 of the Technical Regulations, the use of tape to cover any mechanical components or adjustments is prohibited. Page 21 of 44 02.12.21 v 04.0
18. APPENDIX 1A - Platinum Class GT3 Cup 991.2 Class: Platinum Description: 991.2 GT3 Cup (2017-2019) ITEM DESCRIPTIPON Series Number (Typical) • WPOZZZ99Z#S19XXXX (# = Variable Letter; X = Variable Digit) Engine Specification • Engine to sealed by PMNA/ Porsche AG • Number and layout of cylinders/ 6cylinder Boxer • Cylinder capacity/ 3996 cm3 Minimum Car Weight • 2890 lbs (Car and driver combined) Minimum Ride Heights • Front: 78mm at 991.2/ 991.1 Cup reference point (see graphic Appendix 3, Technical and Measuring Location Regulations V15.10) • Rear: 100mm at 991.2/ 991.1 Cup reference point (see graphic Appendix 3, Technical Regulations V15.10) Main and Helper § Front: OE/ H&R/ Part# 991.343.531.8C main/ 996.343.537.90 helper Springs § Rear: Rear (280 N/mm): PMN.991.333.531.8C(Must replace as delivered (260/mm) main springs) § Rear (80/60/60): 997.333.537.90 Wheelbase • 2456 +/-10mm Overall Length • 4577 +/10mm Rear Wing • See Technical Regulation • Rear Wing Gurney Mandatory/ Part# 991.512.105.8A Overhang • Front: 1046 +/-10mm / Measured from the center of the Front axle to the leading edge of the vehicle (Front Splitter included) • Rear: 1075 +/-10mm / Measured from the center of the Rear axle to the trailing edge of the vehicle (Rear Wing Excluded) Camber • Note: Cambers subject to Tire manufacturer mandate. • Front: -4.3 degrees • Rear: -3.5 degrees Camber Spacers • The maximum spacer washer thickness in the Front and Rear axle control arms. • Front axle: 18mm • Rear axle: 15mm Exhaust System Type • OE/ Standard exhaust system with Supercup Parts: • LH-Part# 991.111.251.9B • RH-Part# 991.111.252.9B ABS System Type • Manthey/Bosch M4 or Manthey/Bosch M5 (as sold through PMNA) Page 22 of 44 02.12.21 v 04.0
19. APPENDIX 1B - Gold Class GT3 Cup 991.1 Class: Gold Description: 991.1 GT3 Cup (2013-2016) ITEM DESCRIPTIPON Series Number (Typical) • WPOZZZ99Z#S19XXXX (# = Variable Letter; X = Variable Digit) Engine Specification • Engine to sealed by PMNA/ Porsche AG • Number and layout of cylinders/ 6-cylinder Boxer • Cylinder capacity/ 3,797 cm3 Minimum Car Weight • 2890 lbs (Car and driver combined) Minimum Ride Heights • Front: 78mm at 991.2/ 991.1 Cup reference point (see graphic Appendix 3, Technical and Measuring Location Regulations V15.10) • Rear: 100mm at 991.2/ 991.1 Cup reference point (see graphic Appendix 3 Technical Regulations V15.10) Main and Helper • Front: OE/ H&R/ Part# 991.343.531.8C main/ 996.343.537.90 helper Springs • Rear: OE/ H&R/ Part# 991.333.531.8C main/ 997.333.537.90 helper Wheelbase • 2458 +/-10mm Overall Length • 4547 +/-5mm Rear Wing • See Technical Regulation • Rear Wing Gurney Mandatory/ Part# 991.512.105.8A Overhang • Front: 1046 +/-10mm / Measured from the center of the Front axle to the leading edge of the vehicle (Front Splitter included) • Rear: 1075 +/-10mm / Measured from the center of the Rear axle to the trailing edge of the vehicle (Rear Wing Excluded) Cambers • Note: Cambers subject to Tire manufacturer mandate • Front: -4.3 degrees • Rear: -3.5 degrees Camber Spacers • The maximum spacer washer thickness in the Front and Rear axle control arms. • Front axle: 18mm • Rear axle: 15mm Exhaust System Type • OE/ Standard exhaust system with Supercup Parts: • LH-Part# 997.111.251.94 • RH-Part# 997.111.252.94 ABS System Type • Installed and approved by USAC Page 23 of 44 02.12.21 v 04.0
20. APPENDIX 2A - Silver Class 718 GT4 Cayman (Type 982) Class: Silver Description: (982) 718 GT4 Cayman Clubsport “Comp” and “Trackday” Silver Description: (982) 718 GT4 Cayman Clubsport “MR” NOTE #1: 982 GT4 Cayman defined by Porsche using FIA standards for safety components. ITEM DESCRIPTIPON Series Number (Typical) • WPOZZZ98ZGK299xxx (X= Variable Digit) Engine Specification • Engine: OE as delivered • Number and layout of cylinders/ 6-cylinder Boxer • Type of charging/ Normally Aspirated • Location of engine/ Mid Longitudinal • Cylinder capacity/ 3,800 cm3 Electronics • Only the OE Engine and Chassis Electronics as programed by PMNA are allowed Minimum Weight • 3,100 lbs. (Without Fuel/ WITH Driver) GT4 Cayman CS “COMP/Trackday” (982) • 3,125 lbs. (Without Fuel/ WITH Driver) GT4 Cayman CS “MR” (982) Minimum Ride Heights • Front: and Measuring Location • 85mm Minimum GT4 Cayman CS “COMP/Trackday/MR” (982) (graphic for location in Ground Clearance of Vehicle section.) • Rear: • 95mm Minimum GT4 Cayman CS “COMP/Trackday/MR” (982) (graphic for location Ground Clearance of Vehicle section.) • Any form of driver-controlled ride height adjustment is not permitted Wheelbase • 2476+/-10mm Overall Length • 4456 +/-5mm Overall Width of • Front: 1817mm +/- 1% Bodywork Overhang • Front: 1778 +/-10mm / Measured from the center of the Front axle to the leading edge of the front splitter along the vehicle centerline • Rear: 1809+/-10mm / Measured from the center of the Rear axle to the trailing edge of the rear wing along the vehicle centerline Camber • Note: Cambers subject to Tire manufacturer’s recommendation. • Front: -4.0 degrees • Rear: -3.7 degrees Camber Spacers • The maximum spacer washer thickness in the Front and Rear axle control arms. • Front axle: 18mm • Rear axle: 15mm Page 24 of 44 02.12.21 v 04.0
Induction System • No Cold Air Intake (MR), holes resulting from kit removal must be covered. The following parts will not be permitted for competition use: Z Air Cleaner Part# 9F2129407 Hose Air Suction Part# 9F2815373 Tube Suction-Air Part# 9F2129557 Bracket Part# 9F2129559 Z Cover Rear Left Part# 9F2853989 Z Cover Rear Right Part# 9F2853990 Intake Hose Part# 9F2129627 Insert Air Filter Part# 9GT129815 Raw Air Induction LH Part# 9F2129521 Raw Air Induction RH Part# 9F2129522 Exhaust System • The entire exhaust system must remain OE, including the tail pipes • Factory optional louder exhaust permitted. Subject to Track restrictions as published in the event SR’s Exhaust manifold Cyl. 1-3 Part# 9F2251215A Exhaust manifold Cyl. 4-6 Part# 9F2251216A Exhaust manifold left with cat Part# 9F2254351A Exhaust manifold right with cat Part# 9F2254350A Exhaust muffler GT4CS II Part# 9F2251053 ABS System Type • OE Porsche ABS with factory calibration Shock • OE Porsche as delivered or as stated below. Absorbers/Springs • Only the following combination is allowed. Spring combinations may only be completely installed as stated in the below table. Trackday (Upgrade)/Comp/MR Trackday (OE Porsche as Delivered) Brakes Front Axle • Six-Piston aluminum racing brake calipers in mono-bloc design with “anti- knock-back” piston springs • Ventilated and grooved steel brake disc 380mm diameter with aluminum disc bells. Front left Part# 9F2615283 Front right Part# 9F2615284 Racing brake pads (endurance) Part# 9913519428B Rear Axle Page 25 of 44 02.12.21 v 04.0
• Four-piston aluminum racing brake calipers in mono-bloc design with “anti- knock-“ piston springs • Ventilated and grooved steel brake disc 380mm diameter with aluminum disc bell Rear left Part# 9F2615583 Rear right Part# 9F2615584 Racing brake pads (endurance) Part# 9F2615117A • Optimized brake cooling duct layout A knock-back spring must be installed in each case under each brake piston of all brake calibers. External thermal or checmical tratment of these springs is prohibited. Front knock-back spring Part# 9913519638A Rear knock-back spring Part# 9913529638A Lubrication system Engine Oil Mobil 1 ESP X3 0W-40 Transmission Clutch oil (ATF): Pentonsin FFI 3 Final drive: 75W 90 Mobilube PTX Fuel System • Fuel cell: OE as delivered and as stated below • A safety fuel tank according to FIA standard FT3-1999 by Art. 253.14 is installed. The maximum fuel volume of 115 liters is made up of the internal volume of all fuel-carrying components, including e.g. the filler pipe or the filler neck. Only the participant is responsible for ensuring that the maximum permitted volume is not exceeded. It is permitted to reduce the volume of the fuel tank using volume displacers/displacement balls. Two different refuelling systems are allowed. One of those two system must be installed. Only original parts specified in the Porsche Motorsport and/or Manthey Racing catalog can be used. Option: Fuel Gun/Dumping Barrels (Trackday “Upgrade”/Comp/MR) Page 26 of 44 02.12.21 v 04.0
Option: Fuel Tower (Trackday “Upgrade”/Comp/MR) Windscreen • OE as delivered 718 GT4 Cayman CS “COMP/Trackday” (982) • Laminated glass front windscreen 718 GT4 Cayman CS “MR” (982) Part# MTH541911 Page 27 of 44 02.12.21 v 04.0
21. APPENDIX 2B- Silver Class 718 GT4 Cayman (Type 981) Class: Silver Description: (981) GT4 Cayman Clubsport “MR” Silver Description: (981) GT4 Cayman Clubsport “Trophy” NOTE #1: 981 GT4 Cayman defined by Porsche using FIA standards for safety components. ITEM DESCRIPTIPON Series Number (Typical) • WPOZZZ98ZGK299xxx (X= Variable Digit) Engine Specification • Engine: OE as delivered • Number and layout of cylinders/ 6-cylinder Boxer • Type of charging/ Normally Aspirated • Location of engine/ Mid Longitudinal • Cylinder capacity/ 3,800 cm3 Electronics • Only the OE Engine and Chassis Electronics as programed by PMNA are allowed Minimum Weight • 3,125 lbs. (Without Fuel/ WITH Driver) GT4 Cayman CS “MR” (982) Minimum Ride Heights • Front: and Measuring Location • 81mm Minimum GT4 Cayman CS (981) (graphic for location TBD) • Rear: • 94mm Minimum GT4 Cayman CS (981) (graphic for location TBD) • Any form of driver-controlled ride height adjustment is not permitted Wheelbase • 2476+/-10mm Overall Length • 4564 +/-5mm Overall Width of • Front: 1978mm +/- 1% Bodywork • Rear: 2002mm +/- 1% Overhang • Front: 1054mm +/-10mm / Measured from the center of the Front axle to the leading edge of the front splitter along the vehicle centerline • Rear: 908+/-10mm / Measured from the center of the Rear axle to the trailing edge of the rear wing along the vehicle centerline Camber • Note: Cambers subject to Tire manufacturer’s recommendation. • Front: -3.5 degrees (suggested minimum) • Rear: -3.0 degrees (suggested minimum) Camber Spacers • The maximum spacer washer thickness in the Front and Rear axle control arms. • Front axle: 18mm • Rear axle: 15mm Exhaust System • The entire exhaust system must remain OE, including the tail pipes Page 28 of 44 02.12.21 v 04.0
• Factory optional louder exhaust permitted. Subject to Track restrictions as published in the event SR’s Exhaust manifold left with catalyst Part# 9811132118C Exhaust manifold right with catalyst Part# 9811132128C Exhaust silencer assembly Part# 98111192006 Shock • Only the following combinations are allowed. Spring combinations may only be Absorbers/Springs completely installed as stated below. ABS System Type • OE Porsche ABS with factory calibration Brakes Front Axle • Six-Piston aluminum racing brake calipers in mono-bloc design with “anti- knock-back” piston springs • Ventilated and grooved steel brake disc 380mm diameter with aluminum disc bells. Front left Part# 9813511058A Front right Part# 9813511068A Racing brake pads (endurance) Part# 9913519428B Rear Axle • Four-piston aluminum racing brake calipers in mono-bloc design with “anti- knock-“ piston springs Page 29 of 44 02.12.21 v 04.0
• Ventilated and grooved steel brake disc 380mm diameter with aluminum disc bell Rear left Part# 9813521078A Rear right Part# 9813511088A Racing brake pads (endurance) Part# 9913529428B • Optimized brake cooling duct layout A knock-back spring must be installed in each case under each brake piston of all brake calibers. External thermal or checmical tratment of these springs is prohibited. Front knock-back spring Part# 9913519638A Rear knock-back spring Part# 9913529638A Lubrication system Engine Oil Mobil 1 ESP X3 0W-40 Transmission Clutch oil (ATF): Pentonsin FFI 3 Final drive: 75W 90 Mobilube PTX Fuel System • Type (981) Only the OE 70L or 100L FT3 Fuel Cell permitted. Modifications of the cell or components are forbidden. • Type (981) 90L Fuel tank option from the production car is not allowed. Car can be converted to FT3 Fuel Cell. OE filler locking cap or OE Dry Break allowed. Windscreen • Type (981) Clubsport Trophy Spec./ OE Safety Glass • Type (981) MR Spec./ OE Safety Glass or OE Polycarbonate • Cracked or Damaged windscreens must be approved by the Series Technical Director prior to use. • Any tear-off film applied to the windscreen must be clear with the sole purpose of protecting the windscreen. • Windscreen wiper in working order is compulsory. Page 30 of 44 02.12.21 v 04.0
22. APPENDIX 3 - Minimum Ground Clearance GT3 Cup • GT3 Classes – Platinum, Gold Minimum ground clearance (Ride Height) of Rear axle measurement point. • Platinum Class • Gold Class Minimum ground clearance (Ride Height) of Front axle measurement point Page 31 of 44 02.12.21 v 04.0
23. APPENDIX 4 - Minimum Ground Clearance GT4 GT4 Classes – Silver Minimum ground clearance (Ride Height) of Rear axle measurement point. Page 32 of 44 02.12.21 v 04.0
Ground Clearance of Vehicle 982 (718)/(Comp, Trackday, MR) The minimum ground clearance of the vehicle (with the driver in the vehicle), tires at 29psi +/- 1psi must not be less than the specified dimension, as measured at the specific measuring points, at any time during the event. For the entire duration of the race event the minimum ground clearance of the front axles is 85mm and the minimum ground clearance at the rear axle is 95mm. The measuring points at the front axles are the mounting bolts (M12x105) of the cross member/ bodywork. The measuring points at the rear axle are the mounting bolts (M10x35) of the diagonal brace mounted to the body used as a fixing point for the rear engine underbody panel. The ground clearance is allowed to be changed within the existing adjustment range. Page 33 of 44 02.12.21 v 04.0
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