Audi Sport Quattro group B (1984)
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2006FOS_1985AudiQuattroS1PikesPeak.jpg Source Development chain:
1981: Audi Quattro
1983: Audi Quattro A1
1983: Audi Quattro A2
1984: Audi Sport Quattro
1985: Audi Sport Quattro S1
1987: Audi Sport Quattro S2

In rallies: see video

Specifications

200 units built
Group/Class B/12 Homologation number: B264 (03/01 ET)
Years active 1984 - 1985 Homologation start: 1/5/1984
Homologation end: 31/12/1990
Engine
Type Audi R5T 20V KW, straight 5 cyl, 4 stroke, petrol engine located front longitudinal with 27.5o inclination to co-drivers side (LHD)
Capacity 2134 or 2110 cc WRC: x 1.4 = 2989 or 2954 cc
1988: x 1.7 = 3629.5 or 3587 cc
Bore x Stroke (mm) 79.3 x 86.4
79.51 x 85.0
Compression ratio 7.5:1
Output power - torgue 450 HP / 7500 rpm 46.9 kgm (460 Nm) / 5500 rpm
Main bearings die-forged steel crankshaft with 6 main bearings 54mm diameter, big end journal diameter 46mm forged steel connecting rod length center to center 136mm or 140mm, big end bearing tunnel diameter 49mm or 50.6mm, aluminium alloy piston
Materials block: aluminium alloy with GG cast iron cylinder liners cylinderhead: cross flow cast aluminium alloy with hemispherical combustion chambers
Cams/valves 2 overhead camshafts (DOHC), belt driven 4 valves/cyl. - 20 valves total. 32.2mm inlet valves diameter, 28.2mm exhaust valves diameter. 25o angle between inlet valve axis and vertical, 25o angle between inlet valve axis and vertical
Aspiration KKK K27 turbocharger (12 blades CrNiSi alloy turbine 64/76.2mm in/out diameter, 12 blades aluminium compressor 48.2/76mm or (Evolution) 60.9/87mm diameter), air/air intercooler with water injection, Bosch LH-jetronic multipoint hydraulic fuel injection. Bosch Sport multipoint electronic hydraulic fuel injection pressure:
Ignition electronic, firing order 1-2-4-5-3
Cooling system jacketed watercooled with pump, radiator, fan and thermostat
Lubrication system wet or dry sump with 1 oil cooler
Transmission
Type four wheel drive 5 speed or 6 speed power shifted or manual gearbox
Gearbox ratios 1st: 3.500/1 (28/8)
2nd: 2.083/1 (25/12)
3rd: 1.368/1 (26/19)
4th: 0.962/1 (25/26)
5th: 0.821/1 (23/28)
R: 3.500/1 (42/12)
1st: 3.111/1 (28/9)
2nd: 2.273/1 (25/11)
3rd: 1.706/1 (29/17)
4th: 1.318/1 (29/22)
5th: 1.125/1 (27/24)
R: 3.500/1 (42/12)
Evolution only:
1st: 2.700/1 (27/10)
2nd: 2.083/1 (25/12)
3rd: 1.706/1 (29/17)
4th: 1.428/1 (30/21)
5th: 1.217/1 (28/23)
6th: 1.040/1 (26/25)
R: 3.455/1 (38/11)
Diffrential ratio front and rear: 3.875/1 (31/8), 4.571/1 (32/7), Evolution only: 4.857/1 (34/7), 5.286/1 (37/7), 5.857/1 (41/7).
1985+: 5.571/1 (39/7)
100% locked center differential with two outputs, 1st to hypoid spiral bevel gear, limited slip front differential homocentrically through secondary hollow shaft of gearbox, 2nd to hypoid spiral bevel gear, limited slip rear differential
Clutch dry, single disk
Chassis-body
Type steel monocoque Typ 859 chassis version of VW B2 platform shortened by 320mm with roll-cage. Front steel subframe. 2 door coupe steel/kevlar bodyshell with plastic front/rear bonnets and bumpers. 1 side air inlet in front of each rear wheel
Front suspension mc pherson strut with lower steel/titanium/aluminium wishbone, 1 longitudinal radius arm, coil spring, telescopic gas shock absorber and antiroll bar 19-22-25-28mm diameter
Rear suspension mc pherson strut with lower steel/titanium/aluminium wishbone, 1 longitudinal radius arm, coil spring, telescopic gas shock absorber and antiroll bar 19-22-25-28mm diameter
Steering system rack and pinion with hydraulic power assistance ratio 22.4/1
Brakes front ventilated disks 295mm diameter with 4 aluminium piston calipers 41.3mm diameter (Lockheed or Girling), rear ventilated disks 295mm diameter with 4 aluminium piston calipers 41.3mm diameter. Ventilated disks all around 280/304/330mm diameter with 4 aluminium piston calipers 42.5/43mm diameter.
1985: front ventilated disks 330mm diameter with 4 aluminium piston calipers 43/44.4mm diameter or 2+2 piston calipers 2x44.4 + 2x40.7mm diameter, rear ventilated disks 280mm diameter with 4 aluminium piston calipers 31/33.9/34.9mm diameter.
dual circuit with VW/Audi hydraulic servo, adjustable ratio split front to rear
Dimensions
length: 4.160 m (163.8") width: 1.790 + 6% = 1.817 m (71.5") height: 1.340 m (52.8")
wheelbase: 2.224 m (87.6") front track: 1.520 m (59.8") rear track: 1.490 m (58.7")
Rims - tires front and rear 7" - 9" x 15" or 16" Michelin
Weight 1100 kg front-rear: 52% - 48%
Fuel tank 90 - 120 lt

Results in WRC

Statistics

1984 1985 1986 Total
Works
Races /wins 6/1 8 14/1
Entries/finishes 9/2 16/9 25/11 (44%)
Others
Races 2 2
Entries/finishes 2/1 2/1 (50%)
Total WRC results
Races 6/1 8 2 16/1
Entries/finishes 9/2 16/9 2/1 27/12 (44%)
Total points 17 71 8 96
(6.000 per race)
(3.555 per entry)

Races

Works team: Audi Sport

Season
Entry Rally event
Driver
Codriver
Team M.C (SVE)
Entry list
POR KEN TdC GRE N.Z ARG FIN S.R (CdI) RAC
Walter Röhrl
Christian Geistdörfer
works eng ine clutch acci dent
Hannu Mikkola
Arne Hertz
works steer ing
Stig Blomqvist
Björn Cederberg
works 1st
Stig Blomqvist
Björn Cederberg
RS02
works eng ine
Michèle Mouton
Fabrizia Pons
RS02
works 4th
Michèle Mouton
Fabrizia Pons
RS05
works eng ine acci dent
Total points
()
17 10 7
Statistics
Works starts/finishes 9/2 1/0 2/0 2/0 2/0 1/1 1/1

01Audi_quattro_1983RACwinner-L.jpg Source
Audi Sport Quattro in RAC rally '84
3170697925_5cce170aa2_z.jpg Source
1985_Audi_Sport_Quattro_SWB_Turbo_Rally_Replica_Engine_1.jpg Source
audi-s10.jpg Source

Drawings

audi_sport-quattro-group-b-rally-car-1984-86_r1.jpg Source

Engine

audi-sport-quattro-005.jpg
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