Audi Sport quattro S1
The Audi Sport Quattro S1 was a variant of the Quattro developed for homologation for Group B rallying in 1984, and sold as a production car in limited numbers. It featured 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. The 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 after the 1.4 multiplication factor applied to turbocharged engines. In road-going form, the engine was capable of generating 306 PS (302 hp; 225 kW) at 6,700 rpm and 350 N⋅m (258 lb⋅ft) at 3,700 rpm, with the engine on the competition cars initially generating around 331 kW (450 PS; 444 hp).
The car in competition form also featured a body shell composed of carbon-kevlar and wider wheel arches, wider wheels (nine inches as compared to the Ur-Quattro's optional 8-inch-wide (200 mm) wheels), the steeper windscreen rake of the Audi 80 (requested by the Audi Sport rally team drivers to reduce internal reflections from the dashboard for improved visibility) and, most noticeably, a 320 mm (12.6 in) shorter wheelbase.
In addition to Group B competition in rallying, the Sport Quattro won the 1985 Pikes Peak International Hill Climb with Michèle Mouton in the driving seat, setting a record time in the process. 224 cars in total of this "short version" Sport Quattro were built, and were offered for sale for DM 203,850.
The Audi Sport Quattro S1 E2 was introduced at the end of 1985 as an update to the Audi Sport Quattro S1. The car featured an inline five-cylinder engine that 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) and generated an officially quoted power output figure of 480 PS (353 kW; 473 hp). However, the turbocharger utilised a recirculating air system, with the aim of keeping the unit spinning at high rpm, when the driver closed the throttle, either to back off during cornering, or on gearshifts. This allowed the engine to resume full power immediately after the resumption of full throttle, reducing turbo lag. The actual power figure was in excess of 500 PS (368 kW; 493 hp) at 8,000 rpm.
In addition to the improved power output, an aggressive aerodynamic kit was added that featured very distinctive wings and spoilers at the front and rear of the car to increase downforce. The weight was reduced to 1,090 kg (2,403 lb). The S1 could accelerate from 0-100 km/h (62 mph) in 3.1 seconds. Some of the cars were supplied with a "power-shift gearbox", a forerunner of the DSG technology.
The S1 E2 made its debut at the 1985 Rally Argentina, with Blomqvist driving. This variant was successful in the rally circuit, with Röhrl and Christian Geistdörfer winning the 1985 San Remo Rally. A modified version of the E2, was also driven by Michèle Mouton. The S1 E2 would become the final Group B car produced by Audi, with the works team withdrawing from the Championship following the 1986 rally in Portugal. The final factory cars of 1986 were rated at 600 PS (441 kW; 592 hp). In 1987, the car won the Pikes Peak International Hill Climb driven by Walter Röhrl.
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