Subaru Impreza GD WRC2007 (S12b)

Home » Rally Cars » Subaru Impreza GD WRC2007

Source

Develompent chain 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 S44 WRC2007 S12b and Hawk eye

Specifications

10 units built, plus 3 conversions from WRC2006

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

2007Season

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 PRO.07.0015	works				oil leak		eng ine			mec hani cal
Petter Solberg Phil Mills PRO.07.014	works					2nd		5th	3rd			7th			16th		4th
Petter Solberg Phil Mills PRO.07.016	works										6th		6th	5th		5th
Chris Atkinson Glenn MacNeall/ Stéphane Prévot PRO.06.011	works				5th		7th			4th
Chris Atkinson Stéphane Prévot PRO.07.015	works																7th
Chris Atkinson Glenn MacNeall/ Stéphane Prévot PRO.06.008	works					acci dent					15th		8th	6th		42th
Chris Atkinson Glenn MacNeall/ Stéphane Prévot PRO.06.006	works							10th	6th			4th			acci dent
Xavier Pons Xavier Amigo PRO.07.017	works									6th		mecha nical			35th		9th
Xavier Pons Xavier Amigo PRO.07.018	works										18th		9th	8th		acci dent
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

2008Season

Entry		Rally event
Driver Codriver	Team	MON	SVE	MEX	ARG	JOR	ITA	GRE	TUR	FIN	DE	NZ	ESP	TdC	JAP	GB
Petter Solberg Phil Mills PRO.07.019	works	5th	4th	11th	ele ctri cal
Petter Solberg Phil Mills PRO.07.018	works					acci dent
Petter Solberg Phil Mills PRO.07.016	works						10th
Chris Atkinson Stéphane Prévot PRO.07.020	works	3rd	21st			3rd	6th
Chris Atkinson Stéphane Prévot PRO.07.016	works			2nd	2nd
Mads Østberg Ole Kristian Unnerud PRO.06.008	Adapta		9th				11th	24th		acci dent			14th	9th
Mads Østberg Ole Kristian Unnerud PRO.07.014	Adapta															acci dent
Gareth Jones David Moynihan/ Clive Jenkins PRO.07.018											16th		18th	16th		tran smis sion
Mark van Eldik Michel Groenewoud PRO.06.002											23rd
Eamonn Boland Michael Morrissey PRO.07.015													15th			34th
Total points ()	57	14	9	9	9	8	6							2
Statistics
Works Starts/finishes	12/10	2/2	2/2	2/2	2/1	2/1	2/2
Others Starts/finishes	14/11		1/1				1/1	1/1		1/0	2/2		3/3	2/2		3/1

2009Season

Entry		Rally event
Driver Codriver	Team	IR	NOR	CY	POR	ARG	ITA	GRE	POL	FIN	AUS	ESP	GB
Eamon Boland Damien Morrissey PRO.07.020		9th
Eamon Boland Damien Morrissey PRO.07.015			eng ine
Tim McNulty Eugene O'Donnell PRO.07.017		12th
Jari Ketomaa Mika Stenberg PRO.06.008										7th
Graham Coffey David Gamblin PRO.07.019												20th
Total points ()	6	2								4
Statistics
Others Starts/finishes	5/4	2/2	1/0							1/1		1/1

2010Season

Entry		Rally event
Driver Codriver	Team	SVE	MEX	JOR	TUR	NZ	POR	BG	FIN	DE	J	ALS	ESP	GB
Mads Ostberg Jonas Andersson PRO.06.008	Adapta AS	8th
Mads Ostberg Jonas Andersson PRO.07.014	Adapta AS								7th					9th
Total points ()	9	3							4					2
Statistics
Others Starts/finishes	3/3	1/1							1/1					1/1

---

Source
Chris Atkinson in Italian rally '08

Drawings

Turbocharger

Transmission

Source
Active center differential assembly
Source
Viscous coupling center differential
Source
Manual transmission 6 speed
Source