Subaru Impreza GDF WRC2007 (S12b)
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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 WRC2007 S12b and Hawk eye

Specifications

Group/Class A/8 Homologation number: A 5695 (18/02 WR plus 29/03 WR)
Years active 2007-2008 Homologation start: 1/3/2007 plus 1/1/2008
Homologation end: 31/12/2015
Engine
Type EJ207, boxer V4cyl (180o) located front longitudinal
Capacity 1997 cc WRC: x 1.7 = 3395 cc
Bore x Stroke (mm) 92.01 x 75.1
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. Nippon Denso MPI multipoint electronic fuel injection with a drive-by-wire throttle pressure: 2.0 bar
Ignition 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 3.900/1 (39/10), rear 3.545/1 (39/11), transfer box 1.100/1 (33/30) 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 limited slip front differential. Hypoid spiral bevel gears limited slip rear differential
Clutch dry double carbon plate, 240mm diameter
Chassis-body
Type steel monocoque GDF 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: 368/326/310mm diameter front/rear with 6 piston calipers
gravel: 316mm diameter with 4 piston calipers front/rear
dual circuit with Bosch servo
Dimensions
length: 4.465 m (175.8") width: 1.800 m (70.9") height: 1.390 m (54.7")
wheelbase: 2.540 m (100.0") front track: 1.510 m (59.5") rear track: 1.515 m (59.6")
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

2007 2008 2009 2010 Total
Works
Races 13 6 19
Entries/finishes 34/27 12/10 46/37 (80.4%)
Others
Races/wins +6 4 3 13
Entries/finishes 14/11 5/4 3/3 22/18 (80.4%)
Total WRC results
Races/wins 13 12 4 3 33
Entries/finishes 34/27 26/21 5/4 3/3 68/55 (80.9%)
Total points 110 57 6 9 182
(5.515 per race)
(2.676 per entry)

Races

Works team: Subaru World Rally Team

Season
Entry Rally event
Driver
Codriver
Team MON SVE NOR MEX POR ARG ITA GRE FIN DE N.Z ESP TdC JAP IR GB
Petter Solberg
Phil Mills
works oil leak 2nd eng ine 5th 3rd mec hani cal 6th 7th 6th 5th 16th 5th 4th
Chris Atkinson
Glenn MacNeall/ Stéphane Prévot
works 5th acci dent 7th 10th 6th 4th 15th 4th 8th 6th acci dent 42th 7th
Xavier Pons
Xavier Amigo
works 6th 18th acci dent 9th 8th 35th acci dent 9th
Total points
()
110 6 9 4 7 13 12 5 11 10 14 6 13
Statistics
Others Starts/finishes 34/27 2/1 2/1 2/1 2/2 2/2 3/2 3/3 3/2 3/3 3/3 3/2 3/2 3/3

Chris_Atkinson_-_2008_Rally_d%27Italia_Sardegna.jpg Source
Chris Atkinson in Italian rally '08

Drawings

Turbocharger

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

Transmission

subaru-manual-transmission-visco.jpg Source
Active center differential assembly
subaru-mt-diff-visco.jpg Source
Viscous coupling center differential
subaru-manual-transmission.jpg Source
Manual transmission 6 speed
si-wrx-sti-5-6.jpg Source
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