The is the most successful purpose-built road racing car in the United States, with over 1,000 units manufactured by SCCA Enterprises . It is a single-seat, open-cockpit sports racer designed for paved road courses , known for its "momentum car" driving style that rewards smooth inputs and high cornering speeds over raw horsepower. Evolution of the Class

: Introduced in 1994, it utilized a sealed 1.9L Ford engine producing 105 hp and 115 lb-ft of torque.

: Sealed Ford 1.6L fuel-injected DOHC 4-cylinder (approx. 135-136 hp). Transmission : Sealed Ford 5-speed manual transaxle.

: Fully adjustable lower A-arms and upper rockers with sealed, rebound-adjustable Penske or Koni shocks.

The SRF is built with a strictly controlled one-design specification to ensure a level playing field:

: The current standard introduced in 2015. It features a lighter 1.6L Ford Sigma engine producing approximately 135 hp. This upgrade reduced the car's minimum weight with driver from 1,670 lbs to 1,560 lbs and increased the top speed to roughly 150 mph. Technical Specifications (Gen3)

The class originated in 1984 as the "Sports Renault," featuring a 1.7L Renault engine. It has since gone through several major iterations:

: Steel tube frame with a three-piece fiberglass body.