Subaru Impreza GC8 WRC97 (S3)
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1993: Subaru Impreza GC8 555
1997: Subaru Impreza GC8 WRC97
1998: Subaru Impreza GC8 WRC98
1999: Subaru Impreza GC8 WRC99
2000: Subaru Impreza GC8 WRC2000
2001: Subaru Impreza GDA WRC2001
2002: Subaru Impreza GDA WRC2002
2003: Subaru Impreza GDB WRC2003
2004: Subaru Impreza GDB WRC2004
2005: Subaru Impreza GDB WRC2005
2006: Subaru Impreza GDF WRC2006
2007: Subaru Impreza GDF WRC2007
2008: Subaru Impreza GE WRC2008

Also called Subaru Impreza 22B WRC97

On board Colin Mcrae: see video

Specifications

Group/Class A/8 Homologation number: A 5480 (24/01 WR)
Years active 1997 - 1998 Homologation start: 1/1/1997
Homologation end: 31/12/2010
Engine
Type EJ20G, Shim-over-bucket, boxer 4 cyl (180o degrees), 4 stroke, petrol engine located front longitudinal
Capacity 1994.3 cc WRC: x 1.7 = 3390.3 cc
Bore x Stroke (mm) 92.0 x 75.0
Compression ratio 9.0:1
Output power - torgue 300 HP / 5500 rpm (360 HP / 6500 rpm at 1.9 bar) 48.0 kgm (471 Nm) / 4000 rpm
Main bearings 5 of 64mm diameter, 52mm big end journals diameter connecting rod length between centers 130.5mm, big end bearing diameter 55mm
Materials block: die-cast aluminium alloy, with cast iron "dry type" cylinder liners, 201mm height cylinderhead: die-cast aluminium alloy 127mm height
Cams/valves 2 x 2 overhead camshafts (DOHC), belt driven 4 valves/cyl. - 16 valves total. 36.2mm inlet valve diameter, 32.2mm exhaust valves diameter. 20.5o angle between inlet axis and vertical, 20.5o angle between exhaust valve axis and vertical. 1 coil spring per inlet/exhaust valve
Aspiration IHI RHB52 turbocharger (steel turbine 58mm diameter, aluminium compressor 60mm diameter), or IHI RH turbocharger (steel turbine 53mm diameter, aluminium compressor 60.4mm diameter), with chargecooler (water-to-air intercooler), 34mm turbo restrictor, anti-lag system and catalytic converter fitted, Jecs Bosch D-jetronic multi point eletronic fuel injection pressure: 2 bar
Ignition electronic. Firing order 1-3-2-4
Cooling system watercooled 7.7 lt
Lubricating system wet sump with 1 oil cooler 5.5 lt
Transmission
Type four wheel drive Prodrive 6 speed semi-automatic gearbox with pneumatic paddle-shift or conventional H-pattern
Gearbox ratios 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 (36/12)
1st: 2.923/1 (38/13)
2nd: 2.125/1 (34/16)
3rd: 1.667/1 (30/18)
4th: 1.333/1 (28/21)
5th: 1.087/1 (25/23)
6th: 0.893/1 (25/28)
R: 2.000/1 (36/12)
1st: 2.923/1 (38/13)
2nd: 2.125/1 (34/16)
3rd: 1.667/1 (30/18)
4th: 1.333/1 (28/21)
5th: 1.087/1 (25/23)
6th: 0.853/1 (29/34)
R: 2.000/1 (36/12)
Diffrential ratio front/rear differentials: 4.111/1 (37/9), 3.364/1 (37/11), 3.454/1 (38/11), 3.545/1 (39/11), 3.700/1 (37/10), 3.900/1 (39/10), 4.364/1 (48/11), 4.444/1 (40/9), 4.625/1 (37/8), 4.875/1 (39/8), 5.143/1 (36/7), 3.889/1 (35/9), 3.875/1 (31/8), 3.444/1 (31/9), 4.375/1 (35/8)
Transfer box: 1.111/1 (30/27), 1.100/1 (33/30), 1.250/1 (30/24), 1.273/1 (28/22), 1.182/1 (26/22), 1.043/1 (24/23), 1.333/1 (28/21), 1.450/1 (29/20), 1.087/1 (25/23), 1.136/1 (25/22)
gearbox driven shaft permanently coupled with central differential case. Active hydro/electronically controlled viscous coupling center differential, with 1st output through hollow driven gearbox shaft to hypoid spiral bevel gears viscous coupling front differential, and 2nd output to helical gears transfer box, and then to hypoid spiral bevel gears limited slip rear differential
Clutch dry, double carbon disk 240mm diameter
Chassis-body
Type Steel monocoque GC8D chassis with roll-cage. Front and rear steel tubular subframes with central tubular steel tunel for rear axle. 2 door coupe steel bodyshell with extended steel wheel arches, aluminium front bonnet, steel supported polypropylene bumbers, and plastic rear spoiler
Front suspension macpherson strut with lower L wishbones, coil springs, Bilstein telescopic watercooled gas shock absorbers and 17 to 35mm diameter anti-roll bar
Rear suspension macpherson strut with 2 lower transverse and 1 longitudinal links, coil springs, Bilstein telescopic watercooled gas shock absorbers and 17 to 35mm diameter anti-roll bar
Steering system rack and pinion with hydraulic power assistance
Brakes ventilated front disks with 270-380mm disk diameter and 4/6/8 aluminium piston calipers. Ventilated rear disks with 270-380mm disk diameter with 4 aluminium piston calipers. Tarmac: 368/326/310mm diameter front/rear with 6/4 piston calipers, gravel: 316mm diameter with 4 or 2 piston calipers front/rear dual circuit with servo, adjustable ratio split front to rear
Dimensions
length: 4.340 m (170.9 in) width: 1.770 m (69.7 in) height: 1.405 m (55.3 in)
wheelbase: 2.520 m (99.2 in) front track: 1.510m (59.4 in) rear track: 1.510 m (59.4 in)
Rims - tires tarmac 8"x18", gravel 7"x15", snow 5.5"x16" Pirelli, 206/65x15 or 205/50x16
Weight 1230 kg
Weight/power 4.1 kg/HP
Fuel tank 70-120 lt

Results in WRC

Statistics

1997 1998 1999 2000 2001 Total
Works
Races/wins 14/8 1 15/8
Entries/finishes 28/17 2/1 30/18 (60%)
Others
Races 9 4 2 1 16
Entries/finishes 21/17 4/3 2/1 1/0 28/21 (75%)
Total WRC results
Races/wins 14/8 10 4 2 1 31/8
Entries/finishes 28/17 23/18 4/3 2/1 1/0 58/39 (67.2%)
Total points 147 28 7 182
(5.871 per race)
(3.138 per entry)

Races

Works team: Subaru World Rally Team

Season
Entry Rally event
Driver
Codriver
Team MC SVE KEN POR ESP TdC ARG GRE N.Z FIN IND S.R AUS RAC
Colin McRae
Nicky Grist
works acci dent 4th 1st elec tri cal 4th 1st 2nd stee ring eng ine eng ine fire 1st 1st 1st
Piero Liatti
Fabrizia Pons
works 1st 2nd 5th 2nd 7th
Kenneth Eriksson
Staffan Parmander
works 1st susp ens ion eng ine 3rd susp ens ion 1st eng ine 3rd acci dent
Total points
()
147 10 17 10 16 16 17 10 8 19 10 14
Statistics
Works starts/finishes 28/17 2/1 2/2 2/1 2/0 2/2 2/2 2/2 2/0 2/1 2/0 2/1 2/2 2/1 2/2

Article from 4T 338, 11/1998

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1997-impreza-wrc-97.jpg Source
suretrac.jpg Source
Suretrac limited slip mechanical differential

Drawings

impreza_wrc_cutaway.gif Source
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