VEHICLE CLASSIFICATION GUIDE

DRIVERS ARE RESPONSIBILE FOR VEHICLE CLASSIFICATION –However, any obvious mis-classification can be corrected at the discretion of a member of the Competition Committee or the Event Chairman. The Autocross Club of Central Oregon follows the car classification rules as outlined in the current SCCA Solo Rulebook and subsequent updates. The following are highlights of allowances for a particular category. If the rulebook doesn’t say you can do a particular modification, you can’t do it!

STOCK CATEGORY – Cars having little if any modifications. Aftermarket fluids, filters, other maintenance items are permitted. Tires must be DOT legal, including R-tires. Shocks can be changed but must retain the OEM geometry and dimensions. Wheels must be the same size as stock but any size tire that fits on the stock rim is permitted. Only the front sway bar may be changed or modified.

Classes are S, A, B, C, D, E, F, G, & H.

List as AS, BS, etc.

STREET TOURING CATEGORY – Sport compact cars with four seats, common suspension, engine, and appearance modifications competing on true street tires with a minimum tread wear rating of 140. Modifications relate to basic bolt on that still meet the car’s emissions standards. Suspension allowances are similar to Street Prepared.

STS has a maximum engine displacement of 3.1 liters and some small displacement turbo cars.

STX has a maximum engine displacement of 5.0 liters or 2.0 liter turbo or supercharged.

Classes and list as STS & STX.

STREET PREPARED CATEGORY – Allowances in excess of Stock and Street Touring. Full interiors but race seats are permitted. Engine intake and exhaust are free but no modifications to turbo or supercharger systems. Emissions control systems may be removed. Coil-over suspensions with adjustable perches and camber plates, etc. permitted. Update/backdate.

Classes are A, B, C, D, E, & F.

List as ASP, BSP, etc.

OVER STREET PREPARED CATEGORY UNDER 2.5L - A vehicle must be street legal and run on street (DOT approved) tires. The vehicle must be capable of being licensed by having the required following equipment; Safety Belts, 2-headlights, 2-taillights, 2-rear reflectors, Registration plate light, 2-brake lights, Turn signal (F&B), 2-Brake systems (Brake & E-Brake), Exhaust System, Wipers, Rear view mirror, Horn, Fenders, & min clearance (nothing lower than the rims).

List as OSPU

OVER STREET PREPARED 2.5L AND OVER - Same as above except for engine displacement.

List as OSPO

STREET MODIFIED – Sedans equipped with drive train and suspension modifications that are beyond those allowed in the Street Prepared Category. Unrestricted brake and suspension components but with original pickup points. Engine swaps within the same model line and turbo or supercharger may be added. Non-Stock hoods and fenders are permitted.

Classes and List as SM (sedans, coupes) & SM2 (sports cars).

PREPARED - Prepared cars are defined as those having extensive mechanical and weight saving modifications and racing slicks. The basic body and engine configuration on Prepared cars remains as delivered from the factory.

Classes are A, B, C, D, E, & F.

List as AP, BP, etc.

MODIFIED - Modified cars are defined as those having very extensive mechanical and weight saving modifications and racing slicks. The modified classes contain specials, formula cars, and engine swaps.

Classes are A, B, C, D, E, & F.

List as AM, BM, etc.

LADIES CLASSES - Women are free to compete in the Open class in which their car is legal. However, ladies' classes will be established in the following manner:

Multiple Classes - A complete set of parallel classes using the same preparation and scoring system as in the Open classes.

List as ASL, STSL, ASPL, OSPUL, SML, APL, AML, etc.

NOVICE CLASS – This is for anyone in any car that has never before autocrossed. This will give you time to understand and figure out what category and class your car should be in. You can run in this class from one to ten events within the same season. You will not earn any points or be able to compete for a Season Championship in this class.
Compare Modifications, 2007 Solo Rules.pdf,(Small download = 3.6 MB)