Audi Sport Quattro S1 (1985)
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014708337-10.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

Chassis numbers here and here
On board in Verzegnis hillclimb 2012: see video
On board: see video (2006) and video
Walter Röhrl: see video
Rallying: see video and video2

Specifications

20 units built
Group/Class B/12 Homologation number: B264 (12/01 ES)
Years active 1985 - 1986 Homologation start: 1/7/1985
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 2110 cc WRC: x 1.4 = 2954 cc
1988: x 1.7 = 3587 cc
Bore x Stroke (mm) 79.51 x 85.0
Compression ratio 7.5:1
Output power - torgue 550 HP / 7500 rpm
600 HP / 8000 rpm
56.0 kgm (550 Nm) / 5500 rpm
60.1 kgm (590 Nm) / 5500 rpm
Main bearings die-forged steel crankshaft with 6 main bearings 58mm diameter, big end journal diameter 47.6mm forged steel connecting rod length center to center 144mm, big end bearing tunnel diameter 50.6mm, aluminium alloy piston
Materials block: aluminium alloy with GG cast iron cylinder liners, 88mm bore spacing, 220mm deck height 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 60.9/87mm diameter), air/air intercooler with antilag system (no water 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 dry sump with 1 oil cooler
Transmission
Type four wheel drive 5 speed manual or 6 speed PDK (Porsche-Doppelkupplung) power shifted gearbox
Gearbox ratios 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: 0.962/1 (25/26)
R: 3.500/1 (42/12)
1st: 3.000/1 (36/12)
2nd: 2.000/1 (32/16)
3rd: 1.526/1 (29/19)
4th: 1.167/1 (28/24)
5th: 0.963/1 (26/27)
R: 2.875/1 (46/16)
1st: 3.500/1 (28/8)
2nd: 2.273/1 (25/11)
3rd: 1.706/1 (29/17)
4th: 1.318/1 (29/22)
5th: 1.04/1 (26/25)
6th: 0.889/1 (24/27)
R: 3.455/1 (38/11)
Diffrential ratio front and rear: 3.875/1 (31/8), 4.571/1 (32/7), 4.857/1 (34/7), 5.286/1 (37/7), 5.571/1 (39/7), 5.857/1 (41/7).
4.375/1 (35/8), 4.625/1 (37/8)
output from secondary gearbox shafto to open or locked or limited slip 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. From FIN '85: torsen center differential with Ferguson coupling and adjustable torgue distribution 20%-80% to 80%-20% front to rear automatically
Clutch dry, double disc
Chassis-body
Type steel monocoque Typ 85 chassis version of VW B2 platform shortened by 320mm with roll-cage. Front steel subframe. 2 door coupe steel/kevlar bodyshell with front/rear plastic bonnets and bumpers. Aerodynamic spoilers to the front and rear of the car to increase downforce
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. 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: 4.240 m (166.9") width: 1.860 m (73.2") height: 1.344 m (52.9")
wheelbase: 2.224 m (87.6") front track: 1.465 m (57.7") rear track: 1.502 m (59.1")
Rims - tires front and rear 7" - 9.75" x 16" Michelin
Weight 1090 kg front-rear: 52% - 48%
Fuel tank 90 - 120 lt

Results in WRC

Statistics

1985 1986 Total
Total works WRC results
Races /wins 4/1 2 6/1
Entries/finishes 6/2 3/2 9/4 (44.4%)
Total points 19 15 34
(5.667 per race)
(3.778 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
Stig Blomqvist
Björn Cederberg
WAUZZZ85ZGA905005
works eng ine 2nd
Walter Röhrl
Christian Geistdörfer
WAUZZZ85ZGA905011
works 1st
Walter Röhrl
Christian Geistdörfer
WAUZZZ85ZGA905002
works acci dent
Hannu Mikkola
Arne Hertz
WAUZZZ85ZGA905003
works oil loss
Hannu Mikkola
Arne Hertz
WAUZZZ85ZGA905010
works eng ine
Total points
()
19 9 10
Statistics
Works starts/finishes 6/2 1/0 2/1 1/1 2/0

Article from AUTOSPORT 7/1985

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Drawings

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