Car Classification

Our objective in classing the cars for the championship is to keep to no more than 4 classes + an exhibition (or open) class for all the cars entered. This makes for a simple classification system and large fields of competitors for each class. We think this is the most fun.

The classes from highest to lowest are:
Exhibition, GT1, GT2, GT3, GT4

Car classification works as follows: Your car, before modifications or tire choice are accounted for, begins in 1 of the 5 classes listed above according to its stock wt/HP ratio and any stock upclassing or downclassing befitting your car model.

Most of the participant's cars will be classified using the stock car weight to engine power definition established in the classification below. However, because of various car designs, engine, induction, or exhaust modifications or other merit, some cars will be upclassed or downclassed in order to provide the most level playing field. When registering to participate in the championship, the organizers will work with you to properly class your car.

Modifications and tire choice may then reclassify your car up or down 1 class (but never greater than 1 class). These parameters are:

Street tires = (-1) class

Race (slick) tires = (+1) class

R-Compound tires = (no class effect). Allowed r-compound tires are: Toyo RA-1, Kumho v700 victoracers, Kumho ecsta v700, Hoosier, Michelin Pilot Sport Cup, Yoko AO32R

Non OEM forced induction or engine displacement upgrade = (+1) class

Modifications that cumulatively count to up-classing

Modifications in 4 of the listed categories below results in +1 class:

• Lightening except removal of spare tire, tools, jack
• Upgraded/Aftermarket ECU, Chip
• Headers, Exhaust (full or cat back), cat removal
• Airbox removal / modification of intake
• Suspension any of: Shocks, springs, swaybars
• Big brake kit (stainless lines, aftermarket fluids, hot pads do not count)
• Engine or drivetrain including cams, porting, lightened flywheel, short gears, ignition, race fuel, aftermarket intercooler to OEM turbo, Nitrous Oxide.

Therefore after looking up your beginning class and applying any modifiers your car will either result in a final class up 1 class, down 1 class or no change from your starting class. Modifications and tire choices that lead to +2 class increments are treated as only 1 class increment. Class increments do not apply to the exhibition class.

Car Class Overview Table | Car Class Complete Table

Class	Definition wt / Hp	Examples of beginning class
GT1	Less than 10	Viper, Z06, ZR1, 911 Turbo, 360 Modena
GT2	10 to 11.99	E46 M3, Vettes, Z28's, 911, Boxster S, S200, Mustang GT, Supra TT, 300ZX, 3rd Gen RX7, 944T, NSX
GT3	12 to 15.49	WRX, E36 M3, E30 M3, Audi S4, 944,MR2T, Boxster, Z3, 2nd Gen RX7, Integra GSR, Celica GTS, Eclipse GST
GT4	15.5 and above	Miata, 318is, Civic Si, Integra, Eclipse GS, Mustang, Camaro, TransAm