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If handicapping cars was easy, they'd have girl/boy scouts doing it.
Previous years' RTR participants'data show less than 12% difference in PPF across the spectrum of cars, tires, modifications, etc.
SCCA PAX has approx. 7% difference from SS through HS (stock) classes, which covers everything from Corvettes to Ford Fiestas. SCCA does not take tire grip into account in most classes.
I agree that HP, weight, grip, and possibly car age will factor into predicted performance. How this is quantified, I'm not sure. The SCCA PAX and definitely old Maverick region PPF are derived from a large data set.
"V"
Previous years' RTR participants'data show less than 12% difference in PPF across the spectrum of cars, tires, modifications, etc.
SCCA PAX has approx. 7% difference from SS through HS (stock) classes, which covers everything from Corvettes to Ford Fiestas. SCCA does not take tire grip into account in most classes.
I agree that HP, weight, grip, and possibly car age will factor into predicted performance. How this is quantified, I'm not sure. The SCCA PAX and definitely old Maverick region PPF are derived from a large data set.
"V"
'87 911 Coupe