The GT, or Grand Touring, class has long been a staple of sports car racing, both in national and international competition. The cars are historically those production-based cars built from the street and modified for the race track, though some cars in international series have been built as specific based race cars with production-lookalike bodies.
Currently, the Rolex Sports Car Series GT class sports some of the top models of sports cars in the world, with competitors
adhering to GRAND-AM's level-playing field. Among those cars eligible for competition in the Rolex Series GT
class are the Aston Martin Vantage GT3, Audi R8, BMW M3, Chevrolet Camaro GT.R, Chevrolet Corvette, Ferrari 458,
Ford Mustang, Lamborghini Gallardo, Mazda RX-8 and Porsche GT3.
GT cars competing in the Rolex Series can be unibodied production cars (Prep 1) or custom tube frame chassis (Prep
2). The rules for GT employ several methods of equalization, including race car weight, tire size and engine RPM limits
to provide an even playing field for the variety of different cars. Engines in GT machines produce between 390 and
450 horsepower depending on the car.
The GRAND-AM Rolex Sports Car Series ran multiple GT classes from 2000-2004, including GTU, GTO, AGT, GTS and
Top Speed: 180 mph
Maximum Race Length: 24 hours
Wheelbase: As production
Weight (min.): 2,200-2,800 pounds
Height (max): Production (based on ride height)
Width (max.): 74 inches
Cars: Aston Martin Vantage GT3, Audi R8, BMW M3, Dodge Viper, Chevrolet Camaro, Chevrolet Corvette, Ferrari 458, Ford Mustang, LMazda RX-8, Porsche GT3
Engines: Audi 5.0-liter V10, 5.0L BMW 4V; 5.0L Ford 4V; 6L GM Pushrod 2V; 4.5L Ferrari V8, Mazda 3 Rotor; 3.6L Porsche Flat 6
Gearbox: Five- or six-speed
Tires: Continental Tires
Chassis: Steel tubing with integral roll cage or production tub with cage
Suspension: Front and rear - independent coil springs, upper and lower A arms
Traction Control: Not permitted