Classes

NOTES:

• Dyno sheets must be presented and disclosed.
• Weigh-Ins:
  • Random Weigh-Ins
  • Podium Finishers
• Weight is total weight and includes all fluids and driver.

CLASSES

• Pro Spec Miata: Pro Spec Miata class rules follow the SM series and have been set by NASA and the SCCA GCR.  View Pro Spec Miata Cup Announcement.
• FF/Formula FARA: Learn more on at Formula FARA.
• GT-1A: Cars with 4-stroke engines larger than 3.8 liters, both naturally aspirated and turbocharged/supercharged are welcome as well as naturally-aspirated 4-rotor rotary engines and turbocharged/supercharged 3-rotor engines. Cars as listed 6.9 pounds per HP and under. Porsche 4.0 liters, Ferrari 458, Ginetta G55 V8 and all GT3. Full tubular or semi-tubular frames permitted.
• GT-1B: Cars with engines larger than 3.6 liters, naturally aspirated only. No full tube frames allowed except: V8 stock cars (GT2) running 15” X 10” wheels with no wing, and TA-2 Trans Am spec and Ginetta G50 V8 with no overhead cams. Cars as listed or 7.0 - 7.9 pounds per HP.
• GT-2A: Cars with engines from 3.4 liters up to 3.6 liters, rotary engines with 3-rotor normally aspirated engines, 2.5 liters turbocharged/supercharged, KTM X-BOW monocoque chassis, Ginetta G55 V6 full-tube frame permitted and all GT4 spec permitted. (SCCA T1), BOP GT4 cars and anything under 9.4 to 8.0 pounds per HP.

  • Make	Model	Weight	Comments
    Aston Martin	Vantage AMR GT4	1445	SRO 2020 MAP 3 ECU MAP BOP 2020
    Audi	R8 GT4	1460	Restrictor 44 mm
    BMW	M4 GT4	1430	Gold Stick / Silver Stick when =< 950mBar
    Ford	Mustang GT4	1490	Restrictor 60 mm ECU MAP BOP 2020
    Ginetta	G56 GT4	1300	Restrictor 44 mm
    KTM	X-BOW GT4 2022	1025	ECU 2020 BOP MAP, 2.0 bar pboost at 1010mb. Rev Limit 7000rpm max. Max camber 2.3F/2.3R
    McLaren	5705 GT4	1425	2019 MAP ECU MAP BOP 2020
    Mercedes	AMG GT4	1400	Power Level 2 MAP 2019 BOP 2020
    Porsche	718 Cayman GT4 CS MR	1301	ECU BOP MAP 2020
    Porsche	718 Cayman GT4 RS Clubsport	1330	Restrictor 53.7 mm ECU BOP MAP 2022
    Toyota	GR Supra GT4	1360	Blue Power Stick BOP 2021

• GT-2B: Cars with naturally aspirated engines from 2.9 liters up to 3.4 liters, and cars with turbocharged/supercharged engines up to 2.0 liters including 13B rotary turbos, and BMW's with S54 engines. (SCCA T2), other cars with 9.5 to 11.0 pounds per HP.
• GT-3: Cars with 11.0 to 15.9 pounds per HP.
• GT-4: Cars with engines from 1.6 liters up to 1.94 liters Open Class (Excluding K20). Includes Miata 1.8 liters (no restrictor plate.) Other cars with 16 pounds per HP minimum.