Chaparral Cars was a United States automotive company which built prototype race cars from the 1960s through the early 1980s. Chaparral was founded by Jim Hall, a Texas oil magnate with an impressive combination of skills in engineering and race car driving. Throughout the 1960s and 1970s, Chaparral's distinctive race cars experienced strong success in both American and European racing circuits. Despite winning the Indy 500 in 1980, the Chaparrals left motor racing in 1982. Chaparral cars also featured in the SCCA/CASC CanAm series and in the European FIA Group 7. It is also said in popular culture that the Chaparral race cars were barred from events because of them being too effective and fast, especially the 2J.

Chaparral was the first to introduce effectively designed air dams and spoilers ranging from the tabs attached to the earliest 2 model to the driver-controlled high wing 'flipper' on the astoundingly different looking 2E, all the way through to Hall's most idealistically inspired creation, the 2J, the car that would forever be known as the 'vacuum cleaner'. The use by Jim Hall of a semi-automatic transmission in the Chaparral created flexibility in the use of adjustable aerodynamic devices.

The development of the Chaparral chronicles the key changes in race cars in the '60s and '70s in both aerodynamics and tires. Jim Hall's training as an engineer taught him to approach problems in a methodical manner and his access to the engineering team at Chevrolet as well as at Firestone changed aerodynamocs and race car handling from an art to empirical science. The embryonic data acquisition systems created by the GM R&D group adided these efforts. An interview with Jim Hall by Paul Haney [1] illustrates many of theese developemnts.