P1 Stohr rules
#30484 from Johnnie Crean · No action required · Minutes (2021-05 Fastrack)
Thank you for your letter. Equalizing lap times is contrary to the P1 class philosophy. P1 cars are not built to a formula, and the
variety of chassis and engine combinations does not lend itself to the balance of performance adjustments seen in some
professional prototype series. P1 cars are therefore subject to balance of power adjustments. The Club Racing Board uses an
SCCA-developed Power Factor formula (PF = Weight/Peak HP + Peak Torque/2) to set weight and power parameters and
periodically collects on-track data to confirm that cars have similar acceleration rates from roughly 60 to 100 mph, before
aerodynamic forces become significant. Competitors may choose the chassis, engine, and tires they wish to race, and the rules
allow for the improvement of aerodynamics, suspension design, brakes, and other systems to make the platform more
competitive, so it should be not assumed that a manufactured car will be capable of running at the front without modification.
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Adding performance parts and components may make it more difficult to meet the applicable minimum weight. The burden is
on the competitor to weigh the pros and cons and decide whether the benefits of adding such parts and components exceed the
penalty of additional weight. Smaller/lighter cars such as the Stohr do not need to develop the same level of downforce or have
the same amount of tire on the road as larger/heavier cars such as the DP02 and converted FA cars to be able to compete with
those cars.