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Current Motorsport Status and History including Formula 1 (F1), World Endurance and GT (WEC, IMSA, Weathertech), IndyCar (NTT), and NASCAR (Monster Cup) racing. Please explore and enjoy your niche for speed.

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1991 IMSA GT Season

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1991 IMSA GT Season
Photo Credit: Mike Garrett.
Champion Constructor: None
Putative Constructor: Mazda (JP,0,1)
Champion Driver: Pete Halsmer (US,2,1)
Putative Driver: Pete Halsmer (US)
Putative Constructor Entry Specification: Model RX-7, 2.62-liter, four-cylinder rotary, fuel injection, five-speed, ventilated disc brakes, carbon composite/steel tubular spaceframe chassis, double wishbone-pushrod/coil independent suspension, 605 horsepower (Lee Dykstra, Matasaburo Maeda).

IMSA in 1991 terminates its Manufacturers Championship honorific after just one season. Mazda with its RX-7 entry breaks through and ends Roush dominance in the IMSA GT category with its maiden putative constructors' title. Mazda veteran Peter Halsmer with his second place finish at Lime Rock in September and a sixth-place result in the season finale at Del Mar at October proves enough to hold off Roush pilot Robby Gordon for his second drivers' crown.

HeM applies the Putative Model to all racing seasons for two primary purposes: First, to effectively normalize all racing seasons for empirical comparison across the decades, and second, to step clear of series organizers which score season championships primarily out of commercial interest or to attract manufacturer participation. The Putative Model simply scores all seasons in the same fashion as a standard track and field meeting, with the only purpose of tracking what takes place at the finishing stripe If the Putative Champion differs from the nominal Series Champion, please note the (SC) notation below.

Mazda163     Halsmer90
Roush Mustang128     Gordon R85
Cunningham Nissan125     Millen S80
FTR Dodge Daytona16     Cobb P74
Riggins Cutlass7     Dale65
Lindley Camaro5     Schroeder Dr38

Noteworthy 1991 Races

1991 Grand Prix of Palm Beach West Palm Beach, Florida1991 1991 Grand Prix of Palm Beach At West Palm Beach for the Grand Prix (one hour) in March, the race comes to a Mazda RX-7 under Pete Halsmer (US) that covers 84.24 miles (average 83.79 mph), under a second (.543) ahead of a companion Mazda driven by Price Cobb. Halsmer moves out front after passing race leader Cobb on the inside line in Turn 10 on the final circuit for a slender and dramatic victory. Photo Credit: