Subaru Legacy BC RS group A (1990)
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Driven with Colin McRae in Tour de Corse '93

Specifications

Group/Class A/8 Homologation number: A5399
Years active 1990 - 1993 Homologation start: 1/1/1990
Engine
Type Subaru EJ20G HLA Rocker-style, boxer V4 cyl, (180o degrees), 4 stroke, petrol engine located front longitudinally with 7o15' front inclination
Capacity 1994.3 cc WRC: x 1.7 = 3390.3 cc
Bore x Stroke (mm) 92.0 x 75.0
Compression ratio 8.8:1
Output power - torgue 300 HP / 6500 rpm 40.0 kgm (392 Nm) / 4500 rpm
47.0 kgm (461 Nm) / 5000 rpm
Main bearings 5 of 64mm diameter connecting rod length between centers 130.5mm, big end bearing diameter 55mm
Materials block: aluminium alloy 401mm height cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers 127mm height
Cams/valves 2 x 2 overhead camshaft (DOHC), belt driven 4 valves/cyl. - 16 valves total. 36.2mm inlet valve diameter, 32.2mm exhaust valve diameter. 26o angle between inlet valve axis and vertical, 26o angle between exhaust valve axis and vertical. 2 or 1 coil spring per valve. Hydraulic Lash Adjusters (HLA)
Aspiration IHI RHB52 VF15 turbocharger (52.8mm steel turbine, 56.2mm aluminium compressor) with chargecooler (water-to-air intercooler) and 40mm turbo restrictor fitted, JECS L-jetronic multi point eletronic fuel injection.
1992-1994: 38mm turbo restrictor fitted.
1995+: 34mm turbo restrictor fitted.
pressure: 1.6 bar
Ignition electronic. Firing order 1-3-2-4
Cooling system jacketed watercooled with pump, radiator, fan and thermostat 7.3 lt
Lubricating system wet sump with 1 oil cooler 5.3 lt
Transmission
Type four wheel drive 5 speed or X-Trac 6 speed manual gearbox
Gearbox ratios 1st: 3.545/1 (39/11)
2nd: 2.111/1 (38/18)
3rd: 1.448/1 (42/29)
4th: 1.088/1 (37/34)
5th: 0.825/1 (33/40)
R: 3.416/1 (41/12)
1st: 2.916/1 (35/12)
2nd: 2.000/1 (30/15)
3rd: 1.500/1 (27/18)
4th: 1.133/1 (34/30)
5th: 0.871/1 (34/39)
R: 3.416/1 (41/12)
dog, 1st: 2.923/1 (38/13)
2nd: 2.125/1 (34/16)
3rd: 1.736/1 (33/19)
4th: 1.450/1 (29/20)
5th: 1.227/1 (27/22)
6th: 1.043/1 (24/23)
R: 2.000/1 (32/16)
1991+, 1st: 3.454/1 (38/11)
2nd: 2.333/1 (33/15)
3rd: 1.750/1 (35/20)
4th: 1.354/1 (42/31)
5th: 0.871/1 (34/39)
R: 2.000/1 (32/16)
Diffrential ratio Front/rear: 4.111/1 (37/9), 3.364/1 (37/11), 3.444/1 (31/9), 3.455/1 (38/11), 3.545/1 (39/11), 3.700/1 (37/10), 3.875/1 (31/8), 3.889/1 (35/9), 3.900/1 (39/10), 4.364/1 (48/11), 4.375/1 (35/8), 4.444/1 (40/9), 4.625/1 (37/8), 4.875/1 (39/8), 5.143/1 (36/7).
Transfer box: 1.000/1 (31/31), 1.111/1 (30/27), 1.100/1 (33/30), 1.250/1 (30/24), 1.273/1 (28/22), 1.043/1 (24/23), 1.182/1 (26/22), 1.333/1 (28/21), 1.450/1 (29/20). 1991+: 1.087/1 (25/23), 1.136/1 (25/22)
gearbox driven shaft permanently coupled with central differential case. Viscous coupling center differential, with 1st output through hollow driven gearbox shaft to hypoid spiral bevel gears limited slip front differential, and 2nd output to helical gears transfer box, and then to hypoid spiral bevel gears limited slip rear differential
Clutch dry, single disk 225mm diameter
Chassis-body
Type Steel monocoque BC chassis with roll-cage. Front and rear steel subframes. 4 door saloon steel bodyshell with steel supported polypropylene bumpers
Front suspension macpherson strut with lower L wishbones, coil springs, telescopic gas shock absorbers and anti-roll bar
Rear suspension macpherson strut with 2 tranverse and 1 longitudinal links, coil springs, telescopic gas shock absorbers and anti-roll bar
Steering system rack and pinion with power assistance 15/1, 13/1, 20/1, 17/1
Brakes front and rear ventilated disks with 270/280/290/304/315/330mm disk diameter and 4/2 aluminium piston calipers. 1991+: ventilated front disks with 340/356mm disk diameter.
gravel: 304mm diameter front/rear, tarmac: 355/332mm disk diameter front/rear
dual circuit with servo, adjustable ratio slit front to rear
Dimensions
length: 4.510 m (177.6 in) width: 1.705 m (67.1 in) height: 1.420 m (55.9 in)
wheelbase: 2.580 m (101.6 in) front track: 1.495m (58.9 in) rear track: 1.485 m (58.5 in)
Rims - tires 15" - 16" michelin
Weight 1100 - 1200 kg 60%-40% front-rear distribution
Weight/power 3.8 kg/HP
Fuel tank

EJ20G engines

EJ20G engines fall in to 3 categories:

[edit] 1. Rocker-style HLA EJ20G usage:Legacy RS 89-93
Legacy RS-RA 89-93
Legacy GT 89-93
Power output ranges from 200 PS (147 kW; 197 bhp) @ 6000 rpm and 260 Nm for the GT to 220 PS (162 kW; 217 bhp) @ 6400 rpm and 270 Nm for the RS versions. Engines can be identified by coil on plug with 2 M6 bolts per coil and valve covers with 4CAM 16VALVE and horizontal lines above and below the plug holes. All these engines have the air-to-water intercooler setup (chargecooler) and Oil squirters.

[edit] 2. Bucket-style HLA EJ20G usage:Impreza WRX 92~96.
Impreza WRX Wagon 92~96.
Impreza WRX STI 93~96
EUDM Subaru Impreza Turbo 94~96
Power output ranges from 220 PS @ 6000 rpm and 260 Nm for the WRX Wagons to 275 PS @ 6500 rpm and 319 Nm for the WRX STI Version II. Engines can be identified by coil on plug with 1 M8 bolt per coil and valve covers with 4CAM 16VALVE and horizontal lines above the plug holes. Generally these engines all have the slanted intercooler. Some engines may not have HLA buckets but solid buckets with shims underneath. These engines also feature lighter valves, the intake valves are marked INKO and the exhaust valves are marked EXKO. The standard HLA valves are I252 and E283 respectively. All WRX Wagon engines and automatic sedan engines came with a TD04 with 90 deg elbow, all manual WRX sedans including STI versions all had a TD05 with 90 deg elbow.

[edit] 3. Shim-over-bucket style EJ20G usage:Impreza WRX AT 97~98
Impreza WRX AT Wagon 97~98
JDM Forester Turbo 97~98
EUDM Subaru Impreza Turbo 97~98
Power output is 250 PS @ 6000 rpm for the Japanese versions and 211 PS for the European model. Engines can be identified by smooth valve covers, plug leads and a wasted spark coil in the middle of the intake manifold. These engines were available with both manual and automatic transmission in Japan, but generally had manual the transmission in Europe in the Impreza Turbo.


Results in WRC

Statistics

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 Total
Works
Races /wins 7 8 6 7/1 28/1
Entries/finishes 14/5 13/8 11/6 15/10 53/29 (54.7%)
Others
Races +1 +1 +4 4 5 4 3 3 2 1 2 30
Entries/finishes 4/2 7/3 12/6 11/5 10/3 6/3 4/2 4/4 3/1 1/0 2/2 63/31 (49.2%)
Total WRC results
Races/wins 7 9 7 11/1 4 5 4 3 3 2 1 2 58/1
Entries/finishes 14/5 17/10 18/9 26/16 11/5 10/3 6/3 4/2 4/4 3/1 1/0 2/2 116/60 (51.7%)
Total points 25 46 50 73 5 5 7 211
(3.638 per race)
(1.819 per entry)

Races

Works team:

  • works: Subaru World Rally Team (1993+)
  • works2: Subaru Rally Team Europe (1991 - 1992)
  • works3: Subaru Technica International (1990)
Season
Entry Rally event
Driver
Codriver
Team M.C
Entry list
POR KEN TdC GRE (N.Z) ARG FIN AUS S.R (CdI) RAC
Markku Alén
Ilkka Kivimäki
works3 eng ine eng ine 4th trans miss ion eng ine
François Chatriot
Michel Périn
works3 clutch
Derek Warwick
Ronan Morgan
works3 acci dent
Jim Heather-Hayes
Anton Levitan
works3 6th
Mike Kirkland
Surinder Thatthi
works3 eng ine clutch
'Possum' Bourne
Rodger Freeth
works3 eng ine 5th 4th
Ian Duncan
Ian Munro
works3 eng ine
Total points
()
25 5 6 7 7
Statistics
Works starts/finishes 14/5 5/2 1/0 2/1 1/1 1/1 2/0 2/0

Article from 4T 263, 8/92

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Article from 4T 230, 11/89

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Drawings

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