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Page Updated: 4/13/2004 12:07:28 PM

2004 Corvette Challenge Series Classification

Though the classing is centered around C5-era Corvettes, C4, C3, etc are welcome to participate, though they may be at a competitive disadvantage depending on their level of modification.

A note on weight reduction: Any weight reduction will be normalized based upon the weight of a stock coupe. For instance, a modified coupe at standard weight may weigh 3200lbs w/430hp, giving it a ratio of 7.44lbs per hp. This is the limit for the stock classes. If you have a Vette with 350hp which weighs 2600lbs, your ratio is 7.42lbs / hp. This places you squarely in Modified at the least, despite the fact you have only 350hp. Incidentally, the weight difference between a stock convertible and a stock coupe is not great enough to warrant a hp exemption for the vert.

This classification system is subject to change at any time.

Draft #3: Currently in force.

STOCK
Allowed on all cars:

Tires: up to 295 width rear tire, 120+ treadwear
Alignment – any setting
Any brake pad
Any oem vette-sized rotor may be drilled / slotted
Any brake fluid
Brake ducting allowed
Brakelines
Thermostat
Radiator cap
Heat Shield
Rollbars, seats, or any other safety equipment allowed
Removal of any part not listed above is allowed, as long as it is not replaced with an aftermarket or modified stock version.

C5's are also allowed the following in Stock (not allowed on Z06 in this class):

Any air filter
Any cat-back exhaust
Modified stock throttle body
X, H pipes

MODIFIED

C5's: same as Stock + up to 100 points from Points Listing below
Z06's: same as Stock + up to 50 points from Points Listing below

PRODUCTION
C5's: same as Stock + up to 200 points from Points Listing below
Z06's: same as Stock + up to 150 points from Points Listing below

UNLIMITED (Anything goes, including any tire, no points limitations)


NOTE: please bear in mind that the points below do not strictly reflect the performance value of each modification on the track, they also reflect the cost of the modification.

Modifications & Points
Turbocharger 100
Supercharger 100
Cam 25
Non-spec Competition Tires* 100
Transmission Mods/replacement 75
Shocks & Springs 75
Spec Competition Tires* 50
Shocks (w/stock springs only) 25
ECU/Ignition Control 25
Remove Catalytic Converter 25
Final Drive gear change 25
Differential 25
Rear Wing/Spoiler (other than OEM) 20
Springs (w/stock shocks only) 15
Any Intake 15
Calipers & Rotors 15
Air Fuel Control (piggybacking) 15
Front swaybar 15
Front wing/dive planes/aerodynamics (non-OEM) 10
Hood (vented, etc.) 10
Rear swaybar 10
Flywheel 10
Header 10
Clutch 5


A note on tires:

Spec competition tires would include Toyo RA-1's, Kumho Victoracers and Ecsta 700's, Yokohama A032R's and the new A032RS.

Hoosiers are temporarily in the spec to allow those who have them to use them up, but the current plan is to define them as a non-spec tire a few events into the season. Defining spec tires is an effort to keep costs down, as Hoosiers are considerably more expensive.

Non-Spec tires will include: non-DOT Slicks, and any r-compound (tires with a treadwear less than 120). The only slicks allowed are hard-compound slicks.