The Classes

The IMSA Continental Tire SportsCar Challenge features sports cars from worldwide manufacturers, straight from the showroom floor, raced side-by-side with only minor modifications. The Continental Tire Challenge has three different classes:

Classes

Grand Sport (GS) - As with all Continental Tire Challenge cars, GS cars start out as stock, production model cars that race with only minor modifications. Following the introduction of GT4 specifications, a wealth of manufacturers like Audi, BMW, Chevrolet, Ford, McLaren, Mercedes-AMG and Porsche have flocked to the class. The engines are tuned to produce between 400 and 500 horsepower and are capable of reaching speeds up to 175 mph.

Touring Car (TCR) - The new-for-2018 TCR class is intermediate in performance to GS and ST. Manufacturers such as Alfa Romeo, Audi, Honda and Volkswagen take to the track in four- or five-door production model cars that only have minor modifications and follow universal specifications. The engines are tuned to produce between 300 and 350 horsepower and are capable of reaching speeds up to 155 mph. For more information on TCR, click here.

Street Tuner (ST) - The history and number of manufacturers that have participated in the ST class is unparalleled. ST also has often been an avenue for drivers to begin their climb up the IMSA ladder. These cars, again production-based, use many of the same stock parts one would find on a passenger car. The engines are tuned to produce between 220 and 280 horsepower and are capable of reaching speeds up to 150 mph.

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