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Description
The Audi Sport Quattro S1 E2 was introduced at the end of 1985 as an update to the Audi Sport Quattro. The car featured an inline 5-cylinder engine that displaced 2,110 cc (128.8 cu in) and produced an officially quoted figure of 350 kW (480 PS; 470 bhp). However, the turbocharger utilised a recirculating air system, with the aim of keeping the turbo 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 bhp (373 kW; 507 PS) at 8000 rpm.

In addition to the improved power output, an aggressive aerodynamic kit was added that featured very distinctive wings and spoilers to the front and rear of the car to increase downforce. The weight was reduced to just 1,090 kg (2,403 lb), and the S1 could accelerate from 0-100 km/h (62 mph) in just 3.1 seconds. Some of the cars were supplied with a "power-shift gearbox", a forerunner of today's DSG technology.

The S1 E2 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 E2, was also driven by Michèle Mouton. The S1 evolution would become the final Group B car produced by Audi, with the works team withdrawing from the Championship following the 1986 rally in Portugal.

Twenty-three years after the cancellation of Group B, the Sport Quattro S1 E2 is still widely regarded as the most powerful rally car ever fielded in international competition[citation needed], with the final factory machines of 1986 rated at 441 kW (600 PS; 591 bhp). In 1987, the car won the Pikes Peak at the hands of Walter Röhrl.

Description
The Audi Sport Quattro S1 E2 was introduced at the end of 1985 as an update to the Audi Sport Quattro. The car featured an inline 5-cylinder engine that displaced 2,110 cc (128.8 cu in) and produced an officially quoted figure of 350 kW (480 PS; 470 bhp). However, the turbocharger utilised a recirculating air system, with the aim of keeping the turbo 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 bhp (373 kW; 507 PS) at 8000 rpm.

In addition to the improved power output, an aggressive aerodynamic kit was added that featured very distinctive wings and spoilers to the front and rear of the car to increase downforce. The weight was reduced to just 1,090 kg (2,403 lb), and the S1 could accelerate from 0-100 km/h (62 mph) in just 3.1 seconds. Some of the cars were supplied with a "power-shift gearbox", a forerunner of today's DSG technology.

The S1 E2 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 E2, was also driven by Michèle Mouton. The S1 evolution would become the final Group B car produced by Audi, with the works team withdrawing from the Championship following the 1986 rally in Portugal.

Twenty-three years after the cancellation of Group B, the Sport Quattro S1 E2 is still widely regarded as the most powerful rally car ever fielded in international competition[citation needed], with the final factory machines of 1986 rated at 441 kW (600 PS; 591 bhp). In 1987, the car won the Pikes Peak at the hands of Walter Röhrl.