BMW E30 M3 group A (1987)
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Snijers-Colebunders-Manx-Rally-1988.jpg Source Development chain
1969: BMW 2002 Ti
1974: BMW 2002 Turbo
1987: BMW E30 M3

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Specifications

Service info
M10
1.5748 crank
5.3149 rod
1.6653 CH
8.5550 total
8.560 deck height
0.005 piston below deck @ TDC

S14
1.6535 crank
5.6496 rod
1.2598 CH (custom)
8.5629 total
8.560 deck height
0.0029 piston above deck @ TDC

Group/Class A/8 Homologation number: A5327
Years active 1987 - 1990 Homologation start: 1/3/1987
Homologation end: 31/12/1995
Engine
Type BMW S14 B23, straight 4 cyl, 4 stroke, petrol engine located front longitudinal with 30o right inclination (to co drivers side)
Capacity 2302 cc WRC: 2302 cc
Bore x Stroke (mm) 93.4 x 84.0
Compression ratio 10.5:1, 12.0:1
Output power - torgue 280 - 300 HP / 8400 rpm 29.0 kgm (285 Nm) / 6500 rpm
Main bearings forged steel crankshaft with 5 main bearings 55mm diameter, big end journals diameter 48mm connecting rod length 144mm, big end bearing tunnel diameter 52mm, aluminium alloy pistons with 32 mm compression height and 22mm pin diameter
Materials block: cast iron, 100mm bore spacing, 217.4mm deck height, 277.5mm height cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers, 95.9mm height
Cams/valves 2 overhead camshafts (DOHC), chain driven 4 valves/cyl. - 16 valves total. 37mm inlet valves diameter, 32mm exhaust valves diameter. Angle between valves 38o, symmetrical with vertical direction. 2 concentric coil springs per valve
Aspiration natural, Bosch DME Motronic electronic multi point fuel injection
Ignition Bosch DME mapped electronic, firing order 1-3-4-2
Cooling system jacketed watercooled with pump, radiator, 5 blades-380mm diameter fan and thermostat 10.5 lt
Lubricating system wet sump with 1 oil cooler 5 lt
Transmission
Type rear wheel drive Getrag 265, 5 speed manual gearbox, 1988+: 6 speed manual gearbox
Gearbox ratios constant, 1.652/1 (38/23)
1st: 3.717/1 (36/16)
2nd: 1.681/1 (32/22)
3rd: 2.403/1 (31/29)
4th: 1.766/1 (26/34)
5th: 1.000/1
R: 4.234/1 (41/16)		 constant, 1.038/1 (27/26)
1st: 2.337/1 (36/16)
2nd: 1.681/1 (34/21)
3rd: 1.358/1 (34/26)
4th: 1.150/1 (31/28)
5th: 1.000/1
R: 2.660/1 (41/16)		 1988: constant, 1.148/1 (31/27)
1st: 2.449/1 (32/15)
2nd: 1.913/1 (30/18)
3rd: 1.579/1 (33/24)
4th: 1.332/1 (29/25)
5th: 1.148/1 (24/24)
6th: 1.000/1
R: 2.449/1 (32/15)		 1989: constant, 1.083/1 (27/26)
1st: 2.466/1 (38/16)
2nd: 1.913/1 (30/18)
3rd: 1.537/1 (37/25)
4th: 1.309/1 (29/23)
5th: 1.133/1 (24/22)
6th: 1.000/1
R: 2.745/1 (37/21x21/14)		 1991, Holinger: constant, 1.300/1 (26/22)
1st: 3.066/1 (33/14)
2nd: 2.218/1 (29/17)
3rd: 1.671/1 (27/21)
4th: 1.357/1 (24/23)
5th: 1.144/1 (22/25)
6th: 1.000/1
R: 3.064/1 (31/14)
Diffrential ratio 3.250/1 (39/12), 3.150/1 (41/13), 3.460/1 (45/13), 3.64/1 (40/11), 3.73/1 (41/11), 3.91/1 (43/11), 4.10/1 (41/10), 4.27/1 (47/11), 4.45/1 (49/11), 4.75/1 (38/8), 5.00/1 (40/8), 5.28/1 (37/7), 5.44/1 (49/9).
1988: 4.56/1 (41/9), 4.67/1 (42/9), 3.15/1 (41/13).
1989: 4.88/1 (44/9), 5.12/1 (41/8).
1990: 4.00/1 (36/9), 4.18/1 (46/11), 4.36/1 (48/11)		 hypoid spiral bevel gear limited slip rear differential. 1988: aluminium housing
Clutch dry single disk, 228mm diameter
Chassis-body
Type Steel monocoque BMW E30 chassis with roll-cage. 2 door steel coupe bodyshell with rear cross member sub frame for suspension. Steel doors and steel front bonnet, plastic rear bonnet with plastic spoiler, plastic front and rear bumbers. 1988: reinforced double plastic rear spoiler
Front suspension macpherson strut with lower steel or aluminium 'L' wishbone, coil springs, telescopic gas shock absorbers and anti-roll bar
Rear suspension semi-trailing arm with coil springs, telescopic gas shock absorbers and anti-roll bar
Steering system rack and pinion with or without hydraulic power assistance 2 turns lock to lock, 19.6/1 or 17.025/1 ratio. 1988: 14.4/1, 14.6/1 ratio
Brakes Front ventilated discs 280 diameter with 1 GGG50 cast iron piston caliper 54mm diameter, rear solid discs 282mm diameter with 1 GGG50 cast iron piston caliper 38mm diameter.
Front ventilated discs 332mm diameter with 4 aluminium piston calipers 42.8/[2x38+2x42]mm pairs diameter, rear ventilated discs 280mm diameter with 4 aluminium piston calipers 38/[2x33.8+2x38]mm pairs diameter.
Front ventilated discs 330mm diameter with 4 aluminium piston calipers 44.5mm diameter, rear ventilated discs 302mm diameter with 4 aluminium piston calipers 2x31.7+2x38.1mm pairs diameter.
Front ventilated discs 332mm diameter with 4 aluminium piston calipers 2x38.1+2x42.7mm pairs diameter, rear ventilated discs 304mm diameter with 4 aluminium piston calipers [2x38.1+2x41.7]/[2x36+2x32]mm pairs diameter.
4 aluminium piston calipers [2x44+2x41]/[2x44+2x40]mm pairs diameter.
1988: rear Brembo ventilated discs 278mm diameter with 4 aluminium piston calipers 2x34+2x38mm pairs diameter
1989: Front carbon fibre ventilated discs 332mm diameter with 4 AP aluminium piston calipers 2x44.5.1+2x41.3mm pairs diameter, rear carbon fibre ventilated discs 280mm diameter with 4 AP aluminium piston calipers 31.75/36/[2x31.75+2x38.1]/[2x33.9+2x38.1]/[2x31.75+2x34.9]/[2x31.75+2x36]mm pairs diameter.
1990: Front ventilated discs 332/343/348/355mm diameter with 4 Girling aluminium piston calipers 42.8/[2x45+2x40]mm pairs diameter, rear ventilated discs 280/304mm diameter with 4 Girling aluminium piston calipers 2x33.9+2x38mm pairs diameter.
1992: front ventilated discs 367mm diameter		 adjustable ratio split front to rear with ATE-Mastervac vacuum servo, with or without Anti-lock Braking System (ABS). 1988: front air hose for disc cooling
Dimensions
length: 4.355 m (171.5 in) width: 1.680 m (66.1 in) height: 1.350 m (53.1 in)
wheelbase: 2.565 m (101.0 in) front track: 1.412 m (55.6 in) rear track: 1.424 m (56.0 in)
Rims - tires 7" x 15", 1988: 9x16" Michelin, slick or semi-slick, 235/590/16 or 245/610/17
Weight 1025 kg 52% - 48% distribution front - back
Fuel tank 55+15 lt
Drag coefficient 0.33

Results in WRC

Statistics

1987 1988 1989 1990 1991 1992 1993 1994 1995 Total
Total WRC results
Races/wins 1/1 3 5 3 2 3 4 4 3 28/1
Entries/ finishes 3/2 6/2 9/7 5/3 3/2 6/1 6/0 7/3 4/1 49/21 (41.7%)
Total points 15 11 33 8 4 1 2 74
(2.643 per race)
(1.542 per entry)

Races

Works team: -

Season
Entry Rally event
Driver
Codriver		 Team MC SVE
Entry list		 POR KEN TdC GRE Oly (NZ) ARG FIN (CdI) SR RAC
Bernard Béguin
Jean-Jacques Lenne		 Rothmans BMW Motul 1st
Marc Duez
Georges Biar		 Prodrive BMW 6th
Patrick Bernardini
José Bernardini		 gear box
Jari Niemi
Jacek Lewandowski		 Rally Cape Company acci dent* 16th (4th)* dnf* dnf*
Francis Serpaggi
Antoine Buresi		 dnf*
Pigoni dnf*
Maurizio Bonamico
Roberto Dotti		 dnf*
Total points
()		 15 15
Statistics
Starts/finishes 3/2 3/2

*Group N4 entries

Article from 4T 199, 4/1987

Click here

Beguin.jpg Source
Bernard Béguin in Tour de Corse 1987

Drawings

bmw_m3_group_a_11.jpg Source
bmw-m3-e30-2.gif Source

Suspension

E30_front_suspension_diagram.jpg Source
e30_rear_susp_diagram.jpg Source
page revision: 142, last edited: 15 Dec 2019 14:31
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