CACC Rule Change Proposal
RCP-2026-6282

18.7.1 Time Attack, Time Attack – Passing and Hillclimb
The following classes and categories are the official for all Time Attack, Time Attack – Passing,
and Hill Climb* events:
18.7.1.1 Sport (S1, S2, S3, S4, S5, S6)
18.7.1.2 Tuner T1, T2, T3, T4, T5)
18.7.1.3 Max (M1, M2, M3, M4, M5)
18.7.1.4 Unlimited (U1, U2, U3)
18.7.1.4.1 U3 minimum weight:1,750 Lbs. (With Driver.)
18.7.1.4.2 U3 Maximum Displacement, 1.999 Litres corrected displacement.
18.7.1.4.3 U2 minimum weight:1,750 Lbs. (With Driver.)
18.7.1.4.4 U2 Maximum Displacement, 3.0 Liters corrected displacement.
18.7.1.4.5 U1 minimum weight: None
18.7.1.5 Formula/Open Wheel/Sports Racer Classification
18.7.1.5.1 Time Trial Special (TTS)
18.7.1.5.2 Time Trial Atlantic (TTA)
18.7.1.5.3 Time Trial Winged (TTW)
18.7.1.5.4 Time Trial Non-Winged (TTN)
18.7.1.5.5 Time Trial V (TTV)

18.7.2.7.2 For Hill Climb events, Max class participants who take advantage of of the
preceding rule will be bumped up on class. For example, a Max 5 car
running 40TW tires would be Max 4. For Hill Climb events, Max 1 class
participants who take advantage of the preceding rule will be bumped up to
Max 1R.

18.7.1 Time Attack, Time Attack – Passing and Hillclimb
The following classes and categories are the official for all Time Attack, Time Attack – Passing,
and Hill Climb* events:
18.7.1.1 Sport (S1, S2, S3, S4, S5, S6)
18.7.1.2 Tuner T1, T2, T3, T4, T5)
18.7.1.3 Max (M1, M2, M3, M4, M5)
18.7.1.4 Unlimited (U1, U2, U3)
18.7.1.4.1 U3 minimum weight:1,750 Lbs. (With Driver.)
18.7.1.4.2 U3 Maximum Displacement, 1.999 Litres corrected displacement.
18.7.1.4.3 U2 minimum weight:1,750 Lbs. (With Driver.)
18.7.1.4.4 U2 Maximum Displacement, 3.0 Liters corrected displacement.
18.7.1.4.5 U1 minimum weight: None
18.7.1.5 Formula/Open Wheel/Sports Racer Classification
18.7.1.5.1 Time Trial Special (TTS)
18.7.1.5.2 Time Trial Atlantic (TTA)
18.7.1.5.3 Time Trial Winged (TTW)
18.7.1.5.4 Time Trial Non-Winged (TTN)
18.7.1.5.5 Time Trial V (TTV)

18.7.7 Hillclimb
The following classes and categories are the official for all Hill Climb* events:
18.7.7.1 Sport (S1, S2, S3, S4, S5, S6)
18.7.7.2 Tuner T1, T2, T3, T4, T5)
18.7.7.2 Max Race (M1R, M2R, M3R, M4R, M5R)
18.7.7.3 Max (M1, M2, M3, M4, M5)
18.7.7.4 Unlimited (U1, U2, U3)
18.7.7.4.1 U3 minimum weight:1,750 Lbs. (With Driver.)
18.7.7.4.2 U3 Maximum Displacement, 1.999 Litres corrected displacement.
18.7.7.4.3 U2 minimum weight:1,750 Lbs. (With Driver.)
18.7.7.4.4 U2 Maximum Displacement, 3.0 Liters corrected displacement.
18.7.7.4.5 U1 minimum weight: None
18.7.7.5 Formula/Open Wheel/Sports Racer Classification
18.7.7.5.1 Time Trial Special (TTS)
18.7.7.5.2 Time Trial Atlantic (TTA)
18.7.7.5.3 Time Trial Winged (TTW)
18.7.7.5.4 Time Trial Non-Winged (TTN)
18.7.7.5.5 Time Trial V (TTV)

In addition to the above, Max Race class will be added for Hill Climb. This is to give a home to cars that are prepped beyond the limit of max but do not properly fit into unlimited.

Cars that fit within the Max category but have weight reduction or race prep modifications that do not otherwise fit in the class can run in Max Race. The class number is the same however the following rules are allowed in Max Race:

Lexan windows complying with CACC GCR are allowed.
Removal of headlights, brake lights, turn signals, corner markers, fog lights, horns, and dashes are allowed.
Running sub 200tw tires conforming to 18.7.2.7.1 are allowed.

The addition of Max Race is to accommodate existing cars that are not at the performance level for unlimited but are beyond the modification allowances for Max. Given that max is considered a “street car class”, making significant allowance changes to accommodate these cars is confusing and muddies the competition. Given that some max competitors do not meet the safety requirements for running sub 200tw tires and some do, it makes competition potentially one sided and does not fit the ethos of “heavily modified street car”.

This rule would remove the “bumping up” a class to allow for sub 200tw race tires and instead move those cars into max race. Deviating significantly from the max rules by allowing sub 200tw tires, weight reduction modifications.

The intention is to reduce the overall number of classes by either combining sport and tuner into a single class or to combine sport and tuner into max class with a performance modifier.