The Audi Sport Quattro S1 was an exclusive variant of the Quattro built for homologation to compete in Group B rallying in 1984. It was fitted with an all-aluminium 2,133 cc (2.1 L) Inline-five engine with a bore x stroke of 79.3 mm × 86.4 mm (3.1 in × 3.4 in) DOHC 4 valves per cylinder, Bosch LH Jetronic fuel injection and a KKK K27 turbocharger, generating 306 PS (302 hp; 225 kW). Road-going versions also featured the steeper windscreen rake of the Audi 80 to reduce internal reflections from the dashboard.
A total of 224 cars, the so-called "short version", were built and sold. Using a 1.4 multiplication factor applied to turbocharged engines, its engine was slightly smaller than that of the standard Audi Quattro in terms of displacement in order to qualify for the 3-litre engine class. The car also featured a body shell composed of carbon-kevlar, wider wheel arches, and wider wheels (nine inches as compared to the Ur-Quattro's optional 8-inch-wide (200 mm) wheels). Furthermore, it had a shorter wheelbase of 320 mm (12.6 in).
Due to its undeniably impressive performance on the race track, the Sport Quattro S1 went on to win the 1985 Pikes Peak International Hill Climb with Michèle Mouton behind the wheel, setting a record time in the process. In addition, this version of the car was successful at the 1985 San Remo Rally, with Röhrl and Christian Geistdörfer taking first place.
Sport Quattro S1 E2
In 1985, the Audi Sport Quattro S1 was upgraded and released as the S1 E2. Its five-cylinder engine displaced 2,110 cc (128.8 cu in) from a bore and stroke of 79.5 mm × 85.0 mm (3.13 in × 3.35 in), officially generating an output of 480 PS (353 kW; 473 hp). It was also fitted with a recirculating air system for the turbocharger with the idea that it would keep the unit spinning at high rpm. This in turn made it capable of achieving a power figure of more than 500 PS (368 kW; 493 hp) at 8,000 rpm. An aggressive aerodynamic kit and lighter bodyweight of 1,090 kg (2,403 lb) meant it could accelerate from 0-100 km/h (62 mph) in just 3.1 seconds.
The S1 E2 made its debut at the 1985 Rally Argentina, with Blomqvist driving. It was also driven by Michèle Mouton and in 1986, won the Pikes Peak International Hill Climb with Walter Röhrl behind the wheel. The S1 E2 became the last Group B car produced by Audi, when the works team withdrew from the Championship following the 1986 rally in Portugal.
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