CN Spec 55 mm FPR
#35836 from Bart Wolf · Not recommended · Minutes (2024-05 Fastrack)
Thank you for your letter. The Club Racing Board does not recommend this change. In the P2 class, Balance of Performance
(BoP) adjustments are not used to equalize top-speed performance, which is heavily affected by the balance of aerodynamic
efficiency versus the downforce package chosen by the driver. If top-speed performance were a basis for BoP adjustment in P2,
no change would be needed: race performance data obtained in several recent events from the subject CN platform and various
cars using motorcycle engine-based platforms does not indicate that the CN platform has a top-speed performance
disadvantage. In P2, the criterion for a BoP adjustment is limited to the analysis of a car's longitudinal acceleration rate in a
speed range before aerodynamic drag has a significant effect—typically between 60 and 100 mph. The data does not
indicate that the CN platform has a performance disadvantage in its acceleration rate, so no justification exists for changing the
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size of the CN platform's flat plate intake restrictor at this time.