In Pixar's Cars 3, what racing series does Lightning McQueen enter against Jackson Storm?

In Pixar's Cars 3, Lightning McQueen competes in the Piston Cup Racing Series against Jackson Storm.

The film begins with McQueen still racing in the Piston Cup, but a new generation of faster computer-designed racers quickly changes the sport. Jackson Storm becomes the leading example of that generation, and McQueen struggles to keep pace with him and other high-tech competitors.

The Piston Cup is the central stock-car racing competition in the Cars films. Its name is a fictional reference to engine parts and is also the trophy contested in the original Cars. Cars 3 returns the series to this established racing world after Cars 2 expanded the story into international espionage.

The Rust-eze Racing Center is a training facility, not the racing series itself. Similarly, the World Grand Prix belongs to Cars 2. These names are related to the franchise but identify different competitions or locations.