Audi Quattro Group B (1986)
The Audi Sport Quattro S1 E2 was introduced in late 1985 as an upgrade to the Audi Sport Quattro. The car featured an inline five-cylinder engine that displaced 2,110 cc and produced an officially rated value of 350 kW. However, the turbocharger used an air recirculation system to keep the turbo spinning at high speeds when the driver closed the throttle, to retreat during cornering, or to the gears. This allowed the engine to resume full power immediately after resuming the full throttle, reducing turbo lag. The actual power was over 500 bhp (373 kW, 507 hp) at 8000 rpm.
In addition to the enhanced power, 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, and the S1 could accelerate from 0 to 100 km / h in 3.1 seconds. Some of the cars came with a power-shift gearbox, a precursor to DSG technology.
The S1 E2 debuted at the 1985 Argentine Rally, with Blomqvist riding. This variant was successful in the rally circuit, with Röhrl and Christian Geistdörfer winning the San Remo Rally 1985. A modified version of E2 was also directed by Michèle Mouton. The evolution of the S1 would become the final car of Group B produced by Audi, with the team retiring from the Championship after the 1986 rally in Portugal. The machines manufactured at the end of 1986 were evaluated at 441 kW (600 PS, 591 HP). In 1987, the car won the Pikes Peak piloted by Walter Röhrl.