CACC Rule Change Proposal
RCP-2023-1196

18.7.1.4 Unlimited (U1, U2)
Vehicles are to be classed as per the current year’s SCCA Time Trials National regulations.

18.7.1.4 Unlimited (U1, U2, U3)

Cars which are production silhouette and meet the following criteria:

1. U3 minimum weight:1,750 Lbs. (With Driver.)
2. U3 Maximum Displacement, 1.999 Litres corrected displacement.
3. U2 minimum weight:1,750 Lbs. (With Driver.)
4. U2 Maximum Displacement, 3.0 Liters corrected displacement.
5. U1 minimum weight: None

Note: U3 is not an SCCA class but a CACC Class. All safety expectations for Unlimited must be met.

While the SCCA rules allow for FI modifiers and also rotary and 2 stroke modifiers, the current U2 classification places cars like a Vintage Mini or Vauxhall (Larry Sandham) and VW GTi (Brad Davidson) against AWD turbo Mitsubishi's (Garrett Mealing) with 600whp. While Tuner, Sport, and Max offer a wide variety of displacement ranges, the Unlimited class is very narrow. It works if you've built for this classification system, but as we have newly adopted the SCCA classification system (3 years ago) and Knox Mountain Hill Climb (who still accept legacy classes in 2023 but will not in 2024 and following) attracts a wide range of racers with cars that cannot fit the Max classification system, this additional class will allow existing builds to participate in a fairer environment.