Non-BMW Car Classification

Non-BMW autocross classes are determined similarly to SCCA events.
Please note that all SS cars with less than 200tw tires (even OEM) will have to run SSR in Class J.
Non-BMW Autocross Classes
Class G Stock, street tires (PAX: SS, AS, BS, FS)
Class H Stock, R compound tires (PAX: CS, DS, ES, GS, HS)
Class I Non-stock, street tires, SCCA Street Modified or Street Prepared classes
Class L Non-stock, street tires, SCCA Street Touring classes
Class J Non-stock, R compound tires
Class M Modified or race cars
You may use the following guidelines to determine if your non-BMW car is stock:

  • Anything available on the exact model and year of your car as standard or optional equipment, as installed on the factory assembly line.
  • Standard OEM identical replacement parts are allowed.
  • Accessories, gauges, appearance, comfort, and convenience items that don’t help your car’s performance. A replacement driver’s seat is not stock.
  • Added roll bar or roll cage. (Roll bars and cages are not required for autocross.)
  • Driver harness is allowed.
  • Trailer hitch and/or tow bar mountings are allowed.
  • Any wheel of diameter and width identical to a stock or factory optional wheel, offset within +/- 0.25 inch, is considered stock.
  • Most street legal tires that will fit the mounted wheels and stock bodywork are considered stock.
  • Any strut/shock absorber of the same type and mounting as original. No change to standard spring mountings is allowed. Suspension geometry may not be altered. Gas, hydraulic, and/or adjustable shocks are permitted.
  • Any brake pads are considered stock.
  • Any front anti-roll bar is considered stock. Change to stock/optional rear anti-roll bar (if present) are not permitted.
  • Any replacement air filter element (or removal of air filter element), but no plumbing changes (intake runner changes or cone air filter).
  • Engine bored no more than .020 inch. No balancing or porting/polishing of head is allowed.
  • Replacement of any part of the exhaust system past the catalytic converter.
  • Any oil filter is allowed.

For a complete and up-to-date list, refer to SCCA’s Class Definitions.
If your car meets these definitions, you will run in Class G, or Class H.
If your car does not meet these definitions, your car most likely belongs to Class I or L (street tires) and J (R-comp tires). You are in class L if you run on street tires and your SCCA class is STS, STX, or ST (the Street Touring classes). Otherwise you are class I (street tires) and your SCCA class is ASP, BSP, CSP, DSP, ESP, FSP, SM, SM2 (the Street Prepared and Street Modified classes).
SCCA Solo II Class and PAX Scoring
Times for Non-BMW classes are adjusted using SCCA’s Solo II PAX index. The PAX index attempts to equalize the field by assigning a time penalty for each run. The time penalty is based on the car’s potential performance.
In order to determine the PAX index for each car, we must know your car’s SCCA Solo II Class. You will be asked for your car’s SCCA Class during online event registration so the timing system would be able to PAX your score. If you don’t know your car’s SCCA Class, please find it using the SCCA Solo Rules. If you are unsure of your car’s SCCA Class, please contact the Autocross Registrar.
Modified and Race Class
Class M is a modified/race category for all cars (including BMW) that are not street legal or are judged to be SCCA Modified or higher. All cars that compete in Class M will have their respective SCCA PAX used to adjust their raw times.