The GTO class was dominated by Corvettes, then by Shelby Mustangs, and then various factory teams consisting of Cougars, 280zxs, Celicas and finally, 300ZXs. GTO - Grand touring-type cars with engines of 2.5L displacement or more, the letter O meaning "over 2.5L".The early years of the series featured GT cars, similar to the European Group 2 and Group 4 classes, divided into four groups: The 1971 season was the first racing season, and lasted six races. Robin McCall in the Hoerr Racing GTO Oldsmobile (1987) For legal reasons, both the 1999-2013 ALMS and the current WeatherTech SportsCar Championship are regarded as a continuation of the original IMSA GT Championship. Despite having various official names, the GT series was known commonly as the "IMSA series", as it was the sanctioning body. In 1999, PSCR decided to affiliate with the Automobile Club de l'Ouest and adopt the sanctioning body's rule book, renaming the series the American Le Mans Series. In deference to the series deviating from the FIA's naming of the class to Sports Racers and Le Mans Prototypes by the French Automobile Club de l'Ouest (ACO) in Europe for their then separate series, the new class was designated IMSA World Sports Car.Īfter a period of multiple ownerships, the organization, by then owned by Don Panoz, was eventually renamed Professional Sports Car Racing (PSCR). After a period of decline in the early 1990s, the Sports Racer Prototype category was introduced in 1993 to replace the top IMSA GTP category in 1994. In 1989, Bishop sold off his organization. In 1981, after Bishop decided to not follow FIA's newly introduced Group C rules, he introduced the GTP class for sports prototypes. IMSA permitted turbocharged cars to compete for the first time, as well as introducing a new category: GTX, based on Group 5 rules. In 1977, the series went through a series of major changes.
Reynolds, and in 1975 introduced a new category: All American Grand Touring (AAGT). įor the following year, John Bishop brought in sponsor R. The first race was held at Virginia International Raceway it was an unexpected success, with both the drivers and the handful of spectators who attended.
Racing began in 1971, and was originally aimed at two of FIA's stock car categories, running two classes each the GT ( Groups 3 and 4) and touring ( Group 1 and 2) classes. The series was founded in 1969 by John and Peggy Bishop, and Bill France, Sr. Races took place primarily in the United States and occasionally in Canada.
IMSA GT was a sports car racing series organized by International Motor Sports Association. (front to rear) Tommy Kendall and Wayne Taylor (both driving an Intrepid RM-1) leads eventual winner Davy Jones ( Jaguar XJR-16) and Chip Robinson, followed by Geoff Brabham (both in Nissan NPT-91), Raul Boesel (XJR-16) and James Weaver ( Porsche 962) in the Nissan Grand Prix of Ohio, at Mid-Ohio Sports Car Course, 1991
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