Subaru Impreza GDB WRC2004 (S10)
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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 S44 WRC2004 S10 and Blob eye

Specifications

Group/Class A/8 Homologation number: A 5652 (09/02 WR)
Years active 2004-2005 Homologation start: 1/3/2004
Homologation end: 31/12/2013
Engine
Type EJ207, boxer V4cyl (180o) located front longitudinal
Capacity 1994 cc WRC: x 1.7 = 3390 cc
Bore x Stroke (mm) 92.0 x 75.0
Compression ratio 9.0:1
Output power - torgue 300 HP / 5500 rpm 60 kgm (589 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 with Active Valve Control System (AVCS) and Tumble Generator Valves (TGVs) 4 valves/cyl. - 16 valves total. 36.2mm inlet valves diameter, 32.2mm exhaust valves diameter. 20.5o angle between inlet valves and vertical, 20.5o angle between exhaust valves and vertical. 1 coil spring per inlet/exhaust valve
Aspiration IHI RH twin scroll turbocharger (oil lubricated and watercooled) with chargecooler (water-to-air intercooler), 34mm turbo restrictor, anti-lag system and catalytic converter fitted. Electronic fuel injection with a drive-by-wire throttle pressure: 2.0 bar
Ignition MoTeC M800 mapped electronic. Firing order 1-3-2-4
Cooling system watercooled 7.7 lt
Lubrication system wet sump with 1 oil cooler 5.5 lt
Transmission
Type four wheel drive Prodrive ATM (Automated Manual Transmission) 6-speed semi-automatic gearbox, electronically controlled, hydraulically actuated paddle-shift, or conventional H-pattern
Gearbox ratios 1st: 3.636/1 (40/11)
2nd: 2.375/1 (38/16)
3rd: 1.761/1 (37/21)
4th: 1.346/1 (35/26)
5th: 1.062/1 (34/32)
6th: 0.842/1 (32/38)
R: 3.545/1 (26/11 x 39/26)
1st: 3.000/1 (30/10)
2nd: 2.250/1 (27/12)
3rd: 1.800/1 (27/15)
4th: 1.470/1 (25/17)
5th: 1.210/1 (23/19)
6th: 1.000/1 (21/21)
R: 3.545/1 (26/11 x 39/26)
Diffrential ratio front and rear 3.900/1 (39/10), transfer box1.000/1 (31/31) active hydro/electronically controlled epicyclical center differential with viscous coupling, 1st output to helical gears transfer box, 2nd output through hollow secondary gearbox shaft to hypoid spiral bevel gears active hydro/electronically controlled viscous coupling front differential. Hypoid spiral bevel gears active hydro/electronically controlled viscous coupling rear differential
2006+: Limited slip front and rear differentials
Clutch dry double carbon plate, 240mm diameter
Chassis-body
Type steel monocoque GDB chassis with roll-cage, front steel subframe for front suspension and gearbox, and rear steel subframe for rear suspension. 4 door saloon steel bodyshell with extended wheel arches, aluminium front bonnet, polypropylene and steel front and rear bumbers, and synthetic rear wing
Front suspension mac pherson strut with lower wishbone, coil springs, Bilstein telescopic watercooled gas shock absorbers and anti-roll bar
Rear suspension mac pherson strut with longitudinal and transverse links, coil springs, Bilstein telescopic watercooled gas shock absorbers and anti-roll bar
Steering system power assisted rack and pinion
Brakes ventilated disks all around,
tarmac: 368/310mm diameter front/rear with 6 piston calipers
gravel: 310mm diameter with 4 piston calipers front/rear
Dimensions
length: 4.415 m (173.8") width: 1.770 m (69.7") height: 1.390 m (54.7")
wheelbase: 2.540 m (100.0") front track: 1.510 m (59.5") rear track: 1.510 m (59.5")
Rims - tires tarmac: 8" x 18", gravel: 7" x 15" Pirelli
Weight 1230 kg
Weight/power 4.1 kg/HP
Fuel tank 70-120 lt

Results in WRC

Statistics

2004 2005 2006 2007 2008 2009 Total
Works
Races 14/5 2/1 16/6
Entries/finishes 28/21 5/4 33/25 (75.8%)
Others
Races/wins +6 3 6 1 16
Entries/finishes 13/6 6/4 8/5 1/1 28/16 (57.1%)
Total WRC results
Races/wins 14/5 8/1 3 6 1 32/6
Entries/finishes 28/21 18/10 6/4 8/5 1/1 61/41 (67.2%)
Total points 134 12 6 5 157
(4.906 per race)
(2.574 per entry)

Races

Works team: Subaru World Rally Team

Season
Entry Rally event
Driver
Codriver
Team MON SVE [MEX NZ CY GRE TUR ARG FIN DE JAP GB ITA FRA ESP AUS
Petter Solberg
Phil Mills
works 4th 1st 4th 1st 3rd eng ine acci dent acci dent 1st 1st 1st 5th 5th acci dent
Mikko Hirvonen
Jarmo Lehtinen
works 5th 7th 5th acci dent 6th 4th acci dent 8th 7th 7th gear box 10th 8th 4th
Total points
()
134 13 14 13 10 13 7 3 14 14 10 7 9 7
Statistics
Works starts/finishes 28/21 2/2 2/2 2/2 2/1 2/2 2/1 2/0 2/1 2/2 2/2 2/1 2/2 2/2 2/1

Article from 4T 419, 8/2005

Original article

petter_2.jpg Source
Petter Solberg Japan rally '04 (gravel)
Rally+Of+Corsica+Final+Day+OhNiJhn1fc2l.jpg Source
Petter Solberg in Tour de Corse '04 (tarmac)

Drawings

subaru-impreza-wrc-2004-rally-japan.gif Source

Turbocharger

modp-0906-03-o-twin-scroll-diagram.jpg

Transmission

si-wrx-sti-5-6.jpg Source
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