C Sports Racer

C Sports Racer (CSR) now known as Prototype 1 (P1) is a class in the Sports Car Club of America.

it consists of open top prototype style cars.

The maximum displacement is 1615cc, in a 2 valve crossflow engine, with a minimum weight of 1300lbs w/driver.

Supercharging and turbocharging are permitted within limits, and with a maximum displacement of 765cc.

Some CSRs are Formula Atlantic or Formula SCCA cars converted by adding bodywork to the chassis.

Steve Forrer racing to his CSR win at the 2013 SCCA National Championship Runoffs