RX Audi Sport quattro S1 E2 – Olle Arnesson

s1rx
AUDI SPORT QUATTRO S1 E2 RX (Olle Arnesson)

Olle Arnesson already was a veteran of rallycross when the Group B era came along. In the European Championship, he had already won the 1980 title while driving a Porsche. He switched to an Audi quattro and captured the 1983 & 1986 titles. For the 1987 season, he switched to a short wheelbase Audi Sport quattro S1 E2 where he finished 3rd. Arnesson’s S1 competed in the European Championship until 1989 when he quit to compete in his national Swedish series instead. The car went through several liveries and aerodynamic variations over the years up until the Group B cars were forcefully retired from rallycross in 1992. Arnesson still owns the car and has since made appearances in retro race events.

Little is known about the full specifications of Arnesson’s S1 E2 but since the WRC version was known to produce up to 600 HP, it is safe to assume that it probably had been augmented in the area of 700 to 800 HP in the rallycross horsepower wars.

SPECIFICATIONS

Group/Class Formula A / Division 2 Championships: none
Years active 1987~1992 Best finish: 3rd (1987)
Engine
Type I-5, DOHC 20v, gas engine located front longitudinal with 27.5right inclination
Displacement 2110 cc
Compression ratio 7.5:1
Output power – torque 600+ HP @ – rpm – lb-ft @ – rpm
Materials block: aluminium cylinder head: aluminium
Aspiration
  • turbocharger
  • air/air intercooler with water injection
  • Bosch LH-jetronic multipoint electronic fuel injection
Boost: N/A
Ignition electronic / firing order 1-2-4-5-3
Cooling system water-cooled
Lubrication system dry sump with 1 oil cooler
Transmission
Type four wheel drive 5 or 6 speed manual gearbox
Gearbox ratios N/A
Differential ratio N/A torsen center differential with Ferguson coupling and adjustable torque distribution 20%-80% to 80%-20% front to rear automatically
Clutch dry – double plate
Chassis-body
Type Steel monocoque Typ-85 chassis version of VW B2 platform shortened by 320mm with roll-cage. Typ-81 windshield. Front steel subframe. 2 door coupe steel/kevlar bodyshell with plastic front/rear bonnets and bumpers. Aerodynamic spoilers to the front and rear of the car to increase downforce.
Front suspension McPherson strut with lower wishbone, coil spring, gas shock absorber and antiroll bar
Rear suspension McPherson strut with lower wishbone, 1 longitudinal radius arm, coil spring, gas shock absorber and antiroll bar
Steering system rack and pinion with hydraulic power assistance 12.4:1
Brakes front/rear ventilated rotors with 4 piston calipers dual circuit with servo
Dimensions
length: 4240 mm (166.9 in) width: 1860 mm (73.2 in) height: 1344 mm (52.9 in)
wheelbase: 2224 mm (87.6 in) front track: 1520 mm (59.8 in) rear track: 1502 mm (59.1 in)
Rims – tires 16 inch Firestone
Dry/Unladen Weight 1050 kg (2315 lb) *estimated Bias: N/A
Weight/power N/A
Fuel tank 25 liters

PICTURES & VIDEOS

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S1rx2

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Arnesson doing an exhibition lap at the 2014 Lydden Hill RX
Arnesson doing an exhibition lap at the 2014 Lydden Hill RX


Article by Jay Auger

Website owner & author


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