Audi Quattro S1 E2
1984 to 1986
|Also called||S1, S1 Quattro "Audi Sport Quattro E2"|
|Predecessor||Audi Sport Quattro|
|Class||Coupé, Group B rally car|
|Body style||2-door coupé|
|Layout||longitudinal front-engine four-wheel-drive|
|Engine||2110 cc I5 turbo|
|Wheelbase||2,204 mm (86.8 in)|
|Length||4,240 mm (166.9 in)|
|Width||1,860 mm (73.2 in)|
|Height||1,344 mm (52.9 in)|
|Kerb weight||1,200 kg (2,646 lb)|
The original Audi Quattro competition car debuted in 1980, first as a development car, and then on a formal basis in the 1980 Janner Rally in Austria. Largely based on the bodyshell of the road-going Quattro models (in contrast to the forthcoming Group B cars), the engine of the original competition version produced approximately 300 bhp (224 kW; 304 PS). In 1981, Michèle Mouton became the first female driver to win a world championship rally, piloting an Audi Quattro Over the next three years, Audi would introduce the A1 and A2 evolutions of the Quattro in response to the new Group B rules, raising power from the turbocharged inline 5-cylinder engine to around 350 bhp (261 kW; 355 PS).
The Quattro A1 debuted at the WRC 1983 season opener Monte Carlo Rally, and went on to win the Swedish Rally and the Rally Portugal in the hands of Hannu Mikkola. Driven by Stig Blomqvist, Mikkola and Walter Röhrl, the A2 evolution won a total of eight world rallies; three in 1983 and five in 1984. Two examples of the same car completely dominated the South African National Rally Championships during 1984 to 1988, with S.A. champion drivers Sarel van der Merwe and Geoff Mortimer at the helm of the 4WD turbo monsters.
The Audi Sport Quattro S1 was a Quattro programme car developed for homologation for Group B rallying in 1984, and sold as a production car in limited numbers. It featured an all aluminium alloy 2,133 cc (130.2 cu in) (2.1 L) 20v DOHC engine slightly smaller than that of the Audi Quattro (in order to qualify for the 3-litre engine class after the scale factor applied to turbo engines). In road-going form, the engine was capable of producing 225 kW (306 PS; 302 bhp), with the competition cars initially producing around 331 kW (450 PS; 444 bhp).
The vehicle also featured a body shell composed of carbon-kevlar and boasting wider arches, wider wheels (nine inches as compared to the Ur-Quattro's optional 8-inch-wide (200 mm) wheel rim), 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 of this "short version" Sport Quattro were built, and were offered for sale at a heady price of 203,850 German Marks.
Sport Quattro S1 E2
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 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.