Initial Divisions
The 1971 season was the first racing season, and featured six races. GT cars, similar to the European classes Group 2 and Group 4, were competing in the early seasons. They were divided into four groups.
- GTO cars were Grand Touring type cars with an engine of 2.5 L displacement or more. The letter "O" colloquially for "Over 2.5L." This category was dominated by the Corvettes, then by the Shelby Mustangs and then the various factory teams consisting of Cougars, 280zx, Celicas and finally, the 300ZX.
- GTU cars were Grand Touring type cars with engines of 2.5 L displacement or less. The letter "U" colloquially for "Under 2.5L." This series was dominated by the Porsche 914-6 and by the SA22 Mazda RX-7s (1978–1985) through the end of the 80's.
- TO were touring-type cars such as the Camaro with an engine of 2.5 L or more displacement.
- TU were touring-type cars with an engine of 2.5 L or less displacement.
In essence, these groups had been absorbed from the Trans Am Series. Trans Am would quickly become a support series for IMSA GT.
Read more about this topic: IMSA GT Championship
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