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  Article Image gallery (32) 008-91 Specifications  
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Country of origin:United States
Produced in:1991
Designed by:Roush Racing
Author:Wouter Melissen
Last updated:May 15, 2020
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Click here to download printer friendly versionBetween 1984 and 1997, Roush Racing built 33 'silhouette' racers for the Ford Motor Company. Sophisticated machines they were designed together with Ford Special Vehicles Operation (SVO) using the latest CAD/CAM technology. Depending the particular model Ford wanted to promote that particular year, the body designs were changed. Under the easily interchangeable skin, the cars were virtually identical, sporting a spaceframe chassis and a small-block V8. Among the few exceptions were the pair of Mustang built for the 1991 IMSA GT Championship.

Some ten months in the making, the new-for-1991 Mustangs did feature the latest version of the familiar spaceframe chassis. Mounted as far back in the chassis the engine of choice was not a V8 but instead a Pinto-based, turbocharged four-cylinder engine. The stock cast-iron block of the 2.5-litre was carried over but thanks to the custom aluminium-alloy cylinder head and Garrett turbo, it produced 750-950 bhp depending on the boost level. What also set the car apart was the use of a transaxle gearbox.

The very potent rolling chassis was clothed with a composite body that to a certain extent resembled the production 'Fox body' Mustang of the day. The bodywork was wider still than that of the earlier cars to clear the massive front and rear Goodyear tyres fitted. On the rear deck a full-width wing was mounted. It boasted a single exhaust mounted in the right-hand sill underneath what would have been that side's door.

The Roush Racing team started the year with the 1990-specification cars and did not debut the new cars until the Miami round at the start of April. Liveried in Whistler colours, the two cars were entered for Robby Gordon and Dorsey Schroeder. Gordon was particularly successful that year, winning at Portland and Del Mar. He ended the year second in the driver standings of the IMSA GTO championship.

For the long distance races at the start of the 1992 season, Roush Racing fielded the cars fitted with the more reliable V8 engines. At the Daytona 24 Hours, one car finished 9th overall and first in the GTS class.

The Roush tube-frame Fords continued to be raced with great success in the IMSA GT and TransAm series. The 1991 cars remain the last fitted with the turbocharged 'four' and a transaxle gearbox.

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  Article Image gallery (32) 008-91 Specifications