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

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Also called Audi Ur Quattro

Specifications

Group/Class 4/4 Homologation number: 671 and B229
Years active 1981 Homologation start: 1/1/1981 and 1/1/1983
Engine
Type WR, straight 5cyl, 4 stroke, petrol engine located front longitudinal
Capacity 2145 cc WRC: 2145 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 6 of 49mm diameter
Materials block: cast iron
1982+: aluminium alloy
cylinderhead: aluminium alloy
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 turbocharger (nickel alloy turbine 64.4mm diameter, aluminium compressor 76mm diameter) with air/air intercooler. Early editions with Hitachi MAC-10 management. Later was changed to Bosch K-jetronic mechanical injection pressure: 1.6 bar
Ignition electronic, Bosch W4DP spark plugs, firing order 1-2-4-5-3
Cooling system watercooled
Lubrication system dry sump with 1 oil cooler 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 wishbone, coil spring, telescopic gas shock absorber and antiroll bar
Rear suspension mc pherson strut with lower wishbone, coil spring, telescopic gas shock absorber and antiroll bar
Steering system rack and pinion with hydraulic power assistance 2.5 turns lock to lock, 22.4/1
Brakes front and rear ventilated disks 280 mm diameter, 4 piston calipers all around dual circuit with 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

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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
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