Subaru Impreza GC8 WRC98 (S4)
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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 WRC98

Specifications

Group/Class A/8 Homologation number: A 5480 (31/02 WR)
Years active 1998 - 1999 Homologation start: 1/1/1998
Homologation end: 31/12/2010
Engine
Type EJ207 JDM, 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 48.0 kgm (471 Nm) / 4000 rpm
Main bearings 5 of 64mm diameter, 52mm big end journals diameter connecting rod length between centers 134.5mm, 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 RH turbocharger (steel turbine 53mm diameter, aluminium compressor 60mm 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, and electronic throttle pressure: 2 bar
Ignition MoTeC M800 mapped 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)
1s1st: 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 viscous coupling 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

1998 1999 2000 2001 2002 2003-2004 2005 Total
Works
Races 13/3 1 14/3
Entries/finishes 27/16 3/0 30/16 (53.3%)
Others
Races +11 10 7 4 1 33
Entries/finishes 1/1 33/18 11/7 8/2 4/2 1/0 58/30 (51.7%)
Total WRC results
Races 13/3 12 10 7 4 1 47/3
Entries/finishes 28/17 36/18 11/7 8/2 4/2 1/0 88/46 (52.3%)
Total points 114 13 10 137
(2.915 per race)
(1.557 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 S.R AUS RAC
Colin McRae
Nicky Grist
works 3rd eng ine 1st diff eren tial 1st 5th 1st 5th susp ens ion 3rd 4th eng ine
Piero Liatti
Fabrizia Pons
works 4th 9th eng ine 6th eng ine 3rd 6th 6th 6th 2nd acci dent
Juha Kangas
Pentti Kuukkala
works acci dent
Jarmo Kytölehto
Arto Kapanen
works 8th
Alister McRae
David Senior
works acci dent
Ari Vatanen
Fabrizia Pons
works ele ctri cal
Achim Mörtl
Jörg Pattermann
17th
Total points
()
114 15 2 15 18 11 15 11 3 17 7
Statistics
Works starts/finishes 27/16 2/2 1/1 2/0 2/1 2/0 2/2 2/2 2/2 3/2 2/1 2/2 2/1 3/0
Others starts/finishes 1/1 1/1

1998+3+montecarlo0201ln0.jpg Source
Colin McRae in Monte Carlo '98

Information and articles

Article from 4T 347, 8/1999

Click here

Article from 4T 331, 4/1998

Click here

motec-03.jpg Source
Motec M800 electronic control unit
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