While cars of many varieties may run together on the track, they are divided into different classes for purposes of timing and selection of Class trophy winners for each event.
Classifications are segmented primarily by two criteria: engine displacement and level of modification. (Note: these are subject to change!!).
Open Track and School Classification |
| Turbo/Supercharged cars are ranked 1 class above their physical displacement |
| | |
| Class 1 |
5.0+ liters, modified |
| Class 2 |
5.0+ liters, unmodified |
| Class 3 |
3.0+ liters, modified |
| Class 4 |
3.0+ liters, unmodified |
| Class 5 |
2.5+ liters, modified |
| Class 6 |
2.5+ liters, unmodified |
| Class 7 |
2.0+ liters, modified |
| Class 8 |
2.0+ liters, unmodified |
| Class 9 |
<= 2.0 liters, modified |
| Class 10 |
<= 2.0 liters, unmodified |
| Class 11 |
Exhibition |
| Class 12 |
Vintage, modified (1969 and older) |
| Class 13 |
Vintage, unmodified (1969 and older) |
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Race Group Classification |
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Minimum safety requirement is now SCCA approved 6-point roll cage instead of the previous 4-point roll bar for all race groups cars.
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GT Challenge Cup |
| GT1 |
Above 5600c.c. for NA engine. Above 3500c.c. for Turbo/Supercharge Engine. |
| GT2 |
Above 4000c.c. to 5600c.c. for NA engine. Above 2400c.c. to 3500c.c. for Turbo/Supercharge Engine. |
| GT3 |
Above 3000c.c. to 4000c.c. for NA engine. Above 1875c.c. to 2400c.c. for Turbo/Supercharge Engine. |
| GT4 |
Above 2275c.c. to 3000c.c. for NA engine. Below 1875 c.c. for Turbo/Supercharge Engine. |
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Touring Car Challenge Cup |
| T1 |
Above 1600c.c. to 2275c.c. with N.A. Engine. Turbo/Supercharge and NOS prohibited. |
| T2 |
Below 1600c.c. with N.A. Engine. Turbo/Supercharge and NOS prohibited. |
| SM |
Spec Miata |
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Toyota Challenge Cup |
| TC |
All Toyota Celica from 1986 year model or up. Front wheel drive model with N.A. Engine only. |
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Formula and Sport Racers series |
| XF |
All Formula with open wheel & open cockpit vehicles |
| SR |
All Spec Racers (FSR, RSR, CSR & DSR) |
