Grand Touring Over
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 | It has been suggested that this article be merged with Grand Touring Experimental, All American Grand Touring, IMSA GTP, GT3 (1998–1999), Grand Touring Under, Grand Touring Supreme and American Challenge to List of IMSA GT classes. (Discuss) Proposed since December 2023. |
Grand Touring Over (GTO)[1] is the name of a former classification designated to grand touring cars competing in sports car racing, originally by IMSA in the IMSA GT Championship, and later by Grand-Am in the Rolex Sports Car Series. IMSA used the class between 1971 and 1991,[2] and Grand-Am used the class for a single season in 2000. The class had its origins in the original "TO" class used by the SCCA in the Trans-Am series, and was also similarly modeled to the FIA's Group 4 and Group 5 racing classes, but eventually evolved over time into its own category.[3] The class specified an engine displacement of more than 2.5 L (150 cu in), with engine design and number of cylinders being unrestricted. turbocharging and supercharging was allowed on engines up to a size of 6.0 L (370 cu in). Engines over 6.0 L (370 cu in) were required to be naturally aspirated. The original class became known as Grand Touring Supreme (GTS) in 1992.[4]
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