Audi Quattro group 4 (1981)
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3511475094_a31e88aa37_z.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
Click here for T85q.com
Also called Audi Ur Quattro

Specifications

Group/Class 4/4 Homologation number: 671 and transfer group B, B242
Years active 1981-1982 Homologation start: 1/1/1981, 1/5/1983
Homologation end: 1/1/1982, 31/12/1994
Engine
Type Audi R5T GV/WR, straight 5 cyl, 4 stroke, petrol engine located front longitudinal with 27.5o inclination to the co-drivers side (LHD)
Capacity 2145 cc WRC: x 1.4 = 3003 cc
1988: x 1.7 = 3646.5 cc
Bore x Stroke (mm) 79.51 x 86.4
Compression ratio 6.3:1
Output power - torgue 300 - 320 HP / 6500 rpm 42.0 kgm (412 Nm) / 3500 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, big end bearing tunnel diameter 49mm, aluminium alloy piston
Materials block: grey cast iron or 22kg lighter aluminium alloy with GG cast iron cylinder liners, 88mm bore spacing, 220mm deck height cylinderhead: reverse flow cast aluminium alloy with hemispherical combustion chambers and vertical valves
Cams/valves 1 overhead camshaft (SOHC), belt driven 2 valves/cyl. - 10 valves total. 38.2mm inlet valve diameter, 33.3mm exhaust valve diameter. 0o angle between inlet valve axis and vertical, 0o angle between inlet valve axis and vertical
Aspiration KKK K26 53269706416 turbocharger (12 blades nickel alloy turbine 54.6/64.4mm in/out diameter, 12 blades aluminium alloy compressor 42/66mm in/out diameter) with air/air intercooler. Early editions with Hitachi MAC-10 management. 1982: Bosch K-jetronic multipoint mechanical fuel injection pressure: 1.6 bar
Ignition electronic, Bosch W4DP spark plugs, 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 located on rear upper spoiler 12 lt
Transmission
Type four wheel drive 016, 5 speed manual gearbox
Gearbox ratios 1st: 3.600/1 (36/10)
2nd: 2.125/1 (34/16)
3rd: 1.360/1 (34/25)
4th: 0.967/1 (29/30)
5th: 0.778/1 (28/36)
R: 3.500/1 (42/12)		 1st: 3.000/1 (27/9)
2nd: 2.000/1 (24/12)
3rd: 1.500/1 (27/18)
4th: 1.217/1 (28/23)
5th: 1.040/1 (26/25)
R: 3.500/1 (42/12)
Diffrential ratio front and rear, 3.888/1 (35/9), 3.222/1 (29/9), 3.444/1 (31/9), 3.556/1 (32/9), 3.700/1 (37/10), 4.111/1 (37/9), 4.300/1 (43/10), 4.375/1 (35/8), 4.556/1 (41/9), 4.625/1 (37/8), 4.778/1 (43/9), 4.875/1 (39/8), output from gearbox secondary shaft to open or locked center differential with two outputs, 1st to hypoid spiral bevel gear, open front differential homocentrically through secondary hollow shaft of gearbox, 2nd to hypoid spiral bevel gear, 75% limited slip rear differential
Clutch Fichtel & Sachs dry, single disk, 240mm diameter
Chassis-body
Type steel monocoque Typ 85 chassis version of VW B2 platform with roll-cage. Front steel subframe. 2 door coupe steel bodyshell with plastic bumpers
Front suspension mc pherson strut with lower steel/titanium/aluminium wishbone, coil spring, telescopic gas shock absorber and antiroll bar
Rear suspension mc pherson strut with lower steel/titanium/aluminium wishbone, coil spring, telescopic gas shock absorber and antiroll bar
Steering system rack and pinion with hydraulic power assistance 3.44 turns lock to lock, 22.4/1. 2.5 turns
Brakes front ventilated disks 280 mm diameter with 1 piston caliper 54mm diameter, rear solid discs 245 mm diameter with 1 piston caliper 36mm diameter. Ventilated discs all around with 4 piston calipers 42.5mm diameter dual circuit with vacuum servo, standard ratio split front to rear: 60%-40%
Dimensions
length: 4.404 m (173.4") width: 1.733 m (68.2") height: 1.346 m (53.0")
wheelbase: 2.524 m (99.4") front track: 1.465 m (57.7") rear track: 1.502 m (59.1")
Rims - tires speedline light alloy
snow or gravel: 6" - 7" x 15", tarmac: 10" x 15"		 Kleber
Weight 1190 - 1240 kg 60% - 40% front to rear distribution
Weight/power 3.9 kg/HP
Fuel tank 90 - 120 lt
Drag coefficient 0.43

Results in WRC

Statistics

1981 1982 1983 1984 1985 1986 Total
Works
Races /wins 8/3 11/5 19/8
Entries/finishes 18/7 30/16 48/23 (47.9%)
Others
Races/wins +1 /2 4 2 1 2 10/2
Entries/finishes 1/0 17/11 6/4 5/1 2/1 3/0 34/17 (50%)
Total WRC results
Races/wins 9/3 11/7 4 2 1 5 29/10
Entries/finishes 19/7 47/27 6/4 5/1 2/1 3/0 82/40 (48.8%)
Total points 52 142 194
(6.690 per race)
(2.366 per entry)

Races

Works team: Audi Sport

Season
Entry Rally event
Driver
Codriver		 Team M.C (SVE)
Entry list		 POR KEN TdC GRE ARG (BRA) FIN S.R CdI RAC
Hannu Mikkola
Arne Hertz		 works brakes 1st eng ine pis ton excl uded 3rd 4th 1st
Michèle Mouton
Annie Arrii		 works fuel 4th cam shaft excl uded 13th 1st acci dent
Franz Wittmann
Kurt Nestinger		 works excl uded with drawn
Michele Cinotto
Emilio Radaelli		 works acci dent
Adolphe Choteau
Pierre-Yves Burel		 fuel
Total points
()		 52 10 7 8 17 10
Statistics
Works starts/finishes 18/7 2/0 1/1 2/1 2/0 3/0 3/2 3/2 2/1
Others starts/finishes 1/0 1/0

Information and articles

Article from 4T 129, 6/1981

Click here

3511475094_a31e88aa37_z.jpg Source
mzF1biF9Th5sja-UAh7z64g.jpg
RevisedMotronicECUDiagram_1.jpg Source
Bosch Motronic for ABY and ADU engines

Drawings

f3b9dcf4bb2358c08b1e10a808f293c6.jpg Source
audi-quattro-rally.GIF Source
UrquattroOrig-1-whitenedCustom.jpg Source

Engine

audiquattro1981engine.jpg

KKK K26 turbocharger

k26-explode-legend.jpg Source

Transmission

audi-quattro-I_x.jpg Source
audi-quattro-I_xx.jpg Source
page revision: 104, last edited: 20 Feb 2019 16:34
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