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  Article Image gallery (17) 001 Specifications  
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Country of origin:Germany
Produced in:1992
Numbers built:2
Internal name:C4
Author:Wouter Melissen
Last updated:July 25, 2017
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Click here to download printer friendly versionHaving pioneered all-wheel drive in rallying during the first half of the 1980s, Audi then decided to use the same technology for circuit racing. Following successful campaigns in Trans-Am in 1988 and IMSA GT in 1989, Audi created a third new race car in as many years to compete in the prestigious DTM series for 1990. This left the hugely sophisticated Audi 90 Quattro IMSA GTO that had been used for less than a season collecting dust.

Audi had sent the 200 Quattro TransAm cars to South Africa to race in the popular Wesbanks Modified but with no Audi 90 model on sale in the country, the IMSA GT car was not eligible to run. By 1991, however, the 200 was losing its competitiveness, so a replacement was badly needed. A compromise was found by using the shell of the new Audi 100 S4, which was for sale in South Africa, and transplanting as much of the running gear from the IMSA GTO car as possible.

In Germany, specialists Matter and Obermoser prepared the S4 shells for shipment to South Africa. Audi Sport also conveniently shipped over one of the two surviving 90 IMSA GTO cars to serve as an inspiration for the new S4 GTOs. Here the cars were built up by Audi and Volkswagen Motorsport Department of South Africa or Voldi for short. The first car was ready towards the end of the 1992 season while, the team was up to two cars by the final round at Kyalami.

While a stock S4 monocoque formed the basis for the rolling chassis, the front and rear sections were cut off. These were replaced with purpose built tubular frames to allow for much more freedom in suspension design. A substantial roll-cage was installed that also connect the front and rear subframes further increasing the rigidity of the chassis. At the front, the S4 GTO was fitted McPherson struts, while at the rear a multi-link setup was used.

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  Article Image gallery (17) 001 Specifications