Subaru Impreza GDA WRC2001 (S7)
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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 named Subaru Impreza S44 WRC2001 S7 and Bug Eye

Specifications

Group/Class A/8 Homologation number: A 5621 (01/01 WR)
Years active 2001 - 2002 Homologation start: 1/1/2001
Homologation end: 31/12/2009
Engine
Type EJ207, boxer V4 cyl (180o), 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 53.0 kgm (520 Nm) / 4000 rpm
Main bearings 5 of 64mm diameter, 52mm big end journals diameter connecting rod length between centers 132.5mm, 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 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 RX turbocharger (steel turbine 62mm diameter, aluminium compressor 69mm diameter) with chargecooler (air/water intercooler), 34mm turbo restrictor, anti-lag system and catalytic converter fitted. Boshc L-jetronic electronic multi point 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 7.5 lt
Lubrication system wet sump with 1 oil cooler 5.5 lt
Transmission
Type four wheel drive 5 speed or Prodrive ATM (Automated Manual Transmission) 6-speed semi-automatic gearbox, electronically controlled, hydraulically actuated paddle-shift, or conventional H-pattern
Gearbox ratios 1st: 3.454/1 (38/11)
2nd: 1.947/1 (37/19)
3rd: 1.366/1 (41/30)
4th: 0.972/1 (35/36)
5th: 0.738/1 (31/42)
R: 3.333/1 (26/12 x 40/26)
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)
or 6th: 0.853/1 (29/34)
R: 2.000/1 (32/16)
Diffrential ratio center differential (transfer box): 1.100/1 (33/30), and 1.000/1 (53/53), 1.087/1 (25/23), 1.136/1 (25/22), 1.181/1 (26/22), 1.273/1 (28/22), 1.304/1 (30/23), 1.333/1 (28/21), 1.364/1 (30/22), 1.450/1 (29/20).
front/rear: 3.900/1 (39/10), and 3.444/1 (31/9), 3.875/1 (31/8), 3.889/1 (35/9), 4.111/1 (37/9), 4.375/1 (35/8)
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. 2006+: friction disk limited slip front/rear differentials
Clutch dry double carbon plate, 230mm diameter
Chassis-body
Type steel monocoque GDA chassis with roll-cage, front and rear steel subframes. 4 door saloon steel bodyshell with extended wheel arches, aluminium front bonnet, polypropylene front and rear bumbers, and synthetic rear wing
Front suspension mac pherson strut with lower L wishbone, coil springs, Bilstein telescopic watercooled gas shock absorbers and anti-roll bar 10 to 40mm diameter
Rear suspension mac pherson strut with 2 transverse and 1 longitudinal links, coil springs, Bilstein telescopic watercooled gas shock absorbers and anti-roll bar 10 to 40mm diameter
Steering system power assisted rack and pinion
Brakes front ventilated disks 366/330/304mm diameter with 6/4 piston calipers, rear ventilated disks 290/304mm diameter with 4/2 piston calipers dual circuit with Bosch vacuum servo, adjustable ratio split front to rear
Dimensions
length: 4.405 m (173.4") width: 1.770 m (69.7") height: 1.440 m (56.7")
wheelbase: 2.525 m (99.4") 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

2001 2002 2003 2004 2005 2006-2007 2008 Total
Works
Races 14/1 11/2 25/3
Entries/finishes 47/25 17/9 64/34 (53.1%)
Others
Races 2 3 1 1 7
Entries/finishes 6/2 1/1 3/1 3/2 1/0 1/1 15/7 (46.7%)
Total WRC results
Races 14/3 11 2 3 1 1 32/3
Entries/finishes 53/27 18/10 3/1 3/2 1/0 1/1 79/41 (51.9%)
Total points 134 62 196
(6.125 per race)
(2.481 per entry)

Races

Works team: Subaru World Rally Team

Season
Entry Rally event
Driver
Codriver
Team MC SVE POR ESP ARG CY GRE KEN FIN NZ S.R TdC AUS RAC
Richard Burns
Robert Reid
works ele ctri cal 16th 4th 7th 2nd 2nd tran smis sion sus pens ion 2nd 1st acci dent 4th 2nd 3rd
Petter Solberg
Phil Mills
works acci dent 6th sus pen sion acci dent 5th fire 2nd acci dent 7th 7th 9th 5th 7th mec hani cal
Markko Märtin
Michael Park
works ele ctri cal 12th acci dent mec hani cal sus pens ion 5th acci dent 6th eng ine
Toshi Arai
Glenn MacNeall
works acci dent 8th 4th fire front sus pen sion 14th lost wheel acci dent eng ine 10th
Frédéric Dor
Didier Breton
F. Dor Rally Team sus pen sion
Achim Mörtl
Stefan Eichhorner
Promotor World Rally Team mec hani cal acci dent 15th
Hamed Al-Wahaibi
Tony Sircombe
Oman Arab World Rally Team 13th
Neil Wearden
Trevor Agnew
acci dent
Total points
()
134 5 7 4 18 16 9 19 14 2 18 13 9
Statistics
Works starts/finishes 46/25 3/0 3/3 4/1 3/1 3/3 3/2 4/1 3/0 3/3 3/3 4/1 4/3 3/2 4/2
Others starts/finishes 6/2 1/0 1/0 1/0 2/2 1/0

WRC01.JPG Source

Information and articles

Article from 4T 364, 1/2001

Click here

impreza01.jpg

Drawings

subaru-impreza-wrc-2001-eng.gif Source

Gearbox, front, center differentials and transfer case

subaru-mt-diff-visco.jpg Source
Viscous coupling center differential
subaru-manual-transmission.jpg Source
1. Input shaft from engine/clutch
3. 3rd gear of primary shaft
4. 4th gear of primary shaft
5. 5th gear of primary shaft
6. Central differential case
7. Output gear of transfer case
8. Transfer case
9. Input gear of transfer case
10. Cental differential
11. Viscous coupling
12. Front differential pinion shaft
13. Gearbox secondary hollow axle
14. 3rd gear of secondary shaft
15. 2nd gear of secondary shaft
16. 1st gear of secondary shaft
18. Front differential
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