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 GD WRC2001
2002: Subaru Impreza GD WRC2002
2003: Subaru Impreza GD WRC2003
2004: Subaru Impreza GD WRC2004
2005: Subaru Impreza GD WRC2005
2006: Subaru Impreza GD WRC2006
2007: Subaru Impreza GD WRC2007
2008: Subaru Impreza GE WRC2008

Also called Subaru Impreza 22B WRC98

Specifications

15 units built. Plus all WRC97 converted to WRC98
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 32/17 11/7 8/2 4/2 1/0 57/29 (50.9%)
Total WRC results
Races 13/3 12 10 7 4 1 47/3
Entries/finishes 28/17 35/17 11/7 8/2 4/2 1/0 87/45 (51.7%)
Total points 114 11 10 135
(2.872 per race)
(1.552 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
PRO.98.020
works eng ine
Colin McRae
Nicky Grist
PRO.97.019
works 1st
Colin McRae
Nicky Grist
PRO.98.022
works diff eren tial 5th
Colin McRae
Nicky Grist
PRO.98.024
works 1st 1st 5th
Colin McRae
Nicky Grist
PRO.98.026
works 3rd eng ine
Colin McRae
Nicky Grist
PRO.98.023
works susp ens ion 4th
Colin McRae
Nicky Grist
PRO.97.015
works 3rd
Ari Vatanen
Fabrizia Pons
PRO.97.015
works ele ctri cal
Piero Liatti
Fabrizia Pons
PRO.97.015
works 9th 6th
Piero Liatti
Fabrizia Pons
PRO.97.014
works 4th
Piero Liatti
Fabrizia Pons
PRO.98.021
works eng ine
Piero Liatti
Fabrizia Pons
PRO.98.023
works eng ine 6th
Piero Liatti
Fabrizia Pons
PRO.98.025
works 3rd 6th acci dent
Piero Liatti
Fabrizia Pons
PRO.98.022
works 6th
Piero Liatti
Fabrizia Pons
PRO.98.027
works 2nd
Alister McRae
David Senior
PRO.98.027
works acci dent
Juha Kangas
Pentti Kuukkala
PRO.98.031
works acci dent
Jarmo Kytölehto
Arto Kapanen
works 8th
Achim Mörtl
Jörg Pattermann
PRO.21
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

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Article from 4T 331, 4/1998

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