In Pixar's Cars, what name is given to the racing championship?

The racing championship in Pixar's Cars is called the Piston Cup.

The Piston Cup is the fictional stock-car racing series in which Lightning McQueen competes. The championship is modeled broadly on American stock-car racing, with races held at large oval tracks and drivers supported by sponsors, crews, and transporters.

The first film's central conflict begins when Lightning, Chick Hicks, and The King finish tied in the championship standings. A tiebreaking race is scheduled at the Los Angeles International Speedway, creating the journey that strands Lightning in Radiator Springs.

The name is sometimes mixed up with Dinoco, which is a major sponsor and racing team rather than the championship itself. The series later changes its branding and includes new generations of racers, but the Piston Cup remains the central domestic competition in the Cars films.