The Audi Sport Quattro S1 is an all-wheel-drive Group B rally car introduced in 1985 by Audi as an update to the 1984 Audi Quattro Sport. The car features a inline 5-cylinder engine that displaces 2110 cc and produces 444 bhp.
The S1 proved to be an immediate success in the rally circuit, helping Walter Röhrl and Christian Geistdörfer win the 1985 San Remo Rally. A modified version of the S1, driven by Michèle Mouton, won the 1985 Pikes Peak International Hillclimb, setting a record time in the process.
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