Autocross Classes

We class cars with a simple system of model, year and modifications. We consider a BMW to be in Stock class if it has only factory equipment. In addition, Stock classes permit any size wheel and tire; non-stock shock absorbers, bushings and strut braces; any brake pad material (brakes must be stock-size), any air filter or cold air intake or catalyst-back exhaust; and only naturally-aspirated cars may use aftermarket engine management software. Tires must be 140 treadwear rated or higher in Stock classes. ANY other performance modification, including but not limited to springs, "R"-compound tires, and engine software for turbocharged/supercharged cars, puts the car in Modified. Non-DOT tires puts the car in Gold Class. We use the honor system. Please classify your car accordingly:

ONLY alterations permitted in STOCK classes:

  • ANY size wheel and tires. Tires must have DOT treadwear rating of 140 or higher
  • ANY shock absorber using stock mounting and ANY suspension bushing material
  • ANY air filter or air intake AHEAD OF mass airflow meter
  • Non-stock software/firmware is permitted on naturally-aspirated engines only
  • ANY brake pad material is allowed with Stock-size brake components
  • Catalyst-back exhaust systems and strut tower braces are permitted

ANY other alterations* move to MODIFIED classes, including:

  • Tires with DOT treadwear rating under 140
  • Non-stock springs, camber plates, coilover suspensions, non-stock anti-roll bars
  • Software/firmware alterations to turbocharged/supercharged engines
  • Non-stock mass airflow meters, camshafts, downpipes, removed catalytic converter
  • Non-stock-size brake rotors or calipers (stock-size replacements OK in Stock)
    *Non- DOT tires go to Gold Class

Car Classes

LC - Legacy Class

4-cylinder models, other BMWs up to 1988, and E30s up to 1986.
Examples: 2002, 320i, 325e, 318ti, 318is, E12/28, E24, Z3 1.9, 3.0CS

NAS - Naturally Aspirated Stock

Stock non-turbo models newer than 1989 and E30s after 1987; and i3.
Examples: E30 325i, E36/46/90 (except 335i), E34/39/60 (except 535i)

NAM - Naturally Aspirated Modified

Modified non-turbo models newer than 1989 and E30s after 1987.
Examples: E30 325i, E36/46/90 (except 335i), E34/39/60 (except 535i)

TS - Turbo Stock

Factory-turbocharged models.
Examples: All models with the N54 or N55 engine including M235i, 4-cylinder turbos (N20), 328d, 335d, V8 turbo models

TM - Turbo Modified

Modified factory-turbocharged models.
Examples: All models with the N54 or N55 engine including M235i, 4-cylinder turbos (N20), 328d, 335d, V8 turbo models

MS - M Stock

Stock M CARS under 400 STOCK HP
Examples: E30/36/46 M3s, E28/39 M5s, E24 M6

MM - M Modified

Modified M CARS under 400 STOCK HP
Examples: E30/36/46 M3s, E28/39 M5s, E24 M6

MPS - M >400HP Stock

Stock M CARS over 400 STOCK HP
Examples: E9X and F8X M3s, V10 M5/6s, turbo M5/6s

MPM - M >400HP Modified

Modified M CARS over 400 STOCK HP
Examples: E9X and F8X M3s, V10 M5/6s, turbo M5/6s

MC - Mini Cooper

ALL R-class (built by BMW) MINI Cooper models

X - Non-BMW

ALL non-BMW or MINI models, BMWs with non BMW engines

G - Gold Class

All Instructors, opt-in drivers, and cars with non-street legal slick tires