2004.09.02


To be homologated in FIA Group N in 2005


The most competitive model "Spec.C" among the Impreza WRX STi series is upgraded further up to 2005 model.The model enhanced in its competing power is scheduled to be homologated in FIA Group N in 2005 and will play an active role in the worldwide rallying field.
* 2005 FIA Group N homologation for the model will become valid at 1st of January 2005.
Main improvements in 2005 model(WRX STi spec C)
(In comparison with 2004 Group N Homologated Car <A/N5656>)
  • Weight reduction of 70kg was achieved by light glass, thinner roof plate and aluminum boot lid etc.
  • Strengthened of hub(Front/Rear) including adopting P.C.D.114.3.
  • Improved by high caster angle front suspension. Introduce aluminum rear lateral link.
  • Turbocharger with ball bearings which enhance engine response
  • Rear crossbar which improves body rigidity
  • Large water tank for intercooler water spray to ensure stable and sustained engine performance
  • Air cooled engine oil cooler
  • Yaw rate control is newly introduced to drivers control center differential.
Aluminum boot lid Air cooled engine oil cooler Large water tank for intercooler water spray 12 litter


Weight reduction of 70kg(17inch model)
*Thinner roof plate *Aluminum boot lid(New) *Lightening the whole glass area
*Less under coats *Lightweight floor carpets *Smaller rear spoiler
*No rear wiper & smaller screenwash water tank *Less tunnel insulator *Less boot trims & carpets


Specifications of Impreza Group N 2005 Model vs 2004 Model
(In comparison with base car)
  2005 MY 2004 MY (FIA A/N5656)
TYPE GDBE4FH-UM GDBD4EH-GL
Overall length 4415mm 4415mm
Overall width 1740mm 1740mm
Overall height 1425mm 1425mm
Wheelbase 2540mm 2525mm
Front track 1490mm 1490mm
Rear track 1495mm 1485mm
Ground clearance 140mm 140mm
Weight 1370kg 1440kg
Max.output 206kW(280PS)/6400rpm 206kW(280PS)/6400rpm
Max.torque 412N.m(42.0kg.m)/4400rpm 394N.m(40.2kg.m)/4400rpm
Turbocharger Ball Bearing Plain Bearing
Gearbox 6 speed and reverse 6 speed and reverse
Final ratio 3.900 3.900
Steering Rack and pinion 13 : 1 Rack and pinion 13 : 1
Suspension Macpherson strut & coil springs(Front & Rear) Macpherson strut & coil springs(Front & Rear)
Minimum turning circle 5.7m 5.4m
Brakes Brembo 17 inch discs(Front & Rear) Brembo 17 inch discs(Front & Rear)
Wheels 17 X 8.0JJ 17 X 7.5JJ
Tyres 235 / 45R17 225 / 45ZR17
Differential Front : Helical, Center : DCCD,
Rear : Mechanical
Front : Sure Trac, Center : DCCD,
Rear : Mechanical
Roof ventilator Equipped None


Select to Group N base car for type of Rally
For tarmacWith Super Sports A.B.S., Brembo, 17inch Brake, DCCD with Auto-mode
GDBE4FH-UM
For gravelFor the above GDBE4FH-UM, VO homologation is scheduled to validate the car to run on gravel with fitting the following parts.(15 inches rally wheel and tyre can be mounted with the following Subaru production 16 inches brake)


Description Q'ty
BRAKE DISC FRONT 16 inch 2
BRAKE DISC REAR 16 inch 2
BRAKE CALIPER FR 16 inch 1
BRAKE CALIPER FL 16 inch 1
CROSS SPRING FRONT BRAKE 2
PIN DISC BRAKE FRONT 2
BOLT & WASHER 4
BRAKE CALIPER RR 16 inch 1
BRAKE CALIPER RL 16 inch 1
CROSS SPRING REAR BRAKE 2
BOLT 4
Description Q'ty
BRAKET PCV 1
MASTER CYLINDER ASSY 1
VACUUM BOOSTER ASSY 1
UNIT ASSY EMCD 1
BRAKE PIPE MASTER CYLINDER PRIMARY FRONT LSFT(LH) 1
BRAKE PIPE MASTER CYLINDER FRONT RIGHT(RH) 1
BRAKEPIPE MASTER CYLINDER PRIMARY PV 1
BRAKE PIPE MASTER CYLINDER SECONDARY PV 1


Parts list for Impreza Group N 2005 Model
1. For Group N (Fundamental competition parts)
Fundamental competition parts for Impreza Group N 2005 Model now on sale as following. (Some parts will be on sale)
For further information, please refer to our Group N web site. ( http://www.subaru-sti.co.jp/e/GRN/index.html )
PARTS No. PARTS NAME Qty/unit PARTS No. PARTS NAME Qty/unit
1. Chassis 2. Engine
ST2031055000 STRUT TOP MOUNT F 2 ST4511355010 RADIATOR CAP 1
ST203704S020 STRUT MOUNT R 2 TBA RESTRICTOR 32mm WITH HOUSING 1
ST203704S030 STRUT MOUNT R 2 TBA DUCT TURBO INTAKE 1
ST2022044010 BUSH TRAILING LINK R 2 TBA ECU Gr.N 1
ST2022044020 BUSH LATERAL LINK OUTER 4 ST224014S020 SPARK PLUG 1
ST2022044040 BUSH LATERAL LINK INNER R 2 ST165464S000 AIR FILTER 1
ST2022044030 BUSH LATERAL LINK INNER F 2 3. Transmission / LSD
ST4100055110 ENGINE MOUNT RH 1 TBA LSD FRONT 1
ST4100055120 ENGINE MOUNT LH 1 TBA F LSD OVERHAUL KIT 1
410224S020 ENGINE MOUNT SET 1 TBA R LSD OVERHAUL KIT 1
410224S010 ENGINE MOUNT 2 TBA CROWN WHEEL 1
410314S000 ENGINE MOUNT BRACKET RH 1 381004S000 PINION SET (HYPOID) 4.444 1
410314S010 ENGINE MOUNT BRACKET LH 1 ST350104S030 GEAR SHIFT LEVER ASSY 1
ST410224S000 GEARBOX MOUNT 1 ST5500055210 DIFF GUARD 1
ST410224S040 GEARBOX MOUNT 1 390004S010 DCCD OVERHAUL KIT 1
ST410224S030 CROSS MEMBER RUBBER SET 1 4.Miscellaneous
ST4130055010 BUSH REAR DIFF MTG F 2 TBA WHEEL 15 INCH PCD114.3 4
ST413224S030 BUSH REAR DIFF MTG F RH 1 TBA REINFORCED DRIVE SHAFT F 2
ST413104S020 DIFF MEMBER ASSY REAR 1 TBA REINFORCED DRIVE SHAFT R 2
ST440314S000 MUFFLER HANGER 4 TBA HYDRAULIC HAND BRAKE KIT 1
ST410404S000 PITCHING STOPPER 1 TBA HIGH FRICTION REAR BRAKE SHOE
* "Bush T/V Link RH, LH" and "Bush Triling Link F" are not necessary to be changed. (Production one is recommended)
* Conversion kit for left-hand drive vehicle will be announced in the end of September 2004.


2. Group N equipment parts
Although STI does not develop certain Group N parts such as suspension, dog gearbox, rollcage homologated by ASN, safety fuel tank, carbon interior and exterior parts, STI Group N base company in Europe(Prodrive, TopRun and Tommi makinen Racing) do deal in them. Correspondence will be operated only by the language of the country or in English.
Name of Company Country Person in charge Address/Tel/Fax
Prodrive Motorsport Ltd UK Mr. Nigel Riddle
Mr. Jason Hill
Banbury Oxfordshire OX16 3ER England United Kingdom.
tel : (44) 1295-273355 fax:(44) 1295-255473
TopRun Racing Italy Mr. Michele Agnello Via lV Novembre, 36 21043 Castiglione Olone (VA) Italy.
tel : (39) 0331-861151 fax:(39) 0331-861199
Tommi Mäkinen Racing oy Finland Mr. Esko Reiners Tervamaantie 9 FIN-41120 Puuppola Finland
tel : (358) 14-211240 fax:(358) 14-211230

* The STI Group N base companies mentioned above also supply Group N competition vehicles for a various specifications and all the associated parts(parts listed in No. 1 and 2 above, genuine parts from Fuji Heavy Industries Ltd. as well)
* For the other areas, please consult STI.


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PRESS RELEASE (PDF FORMAT)


Group N Information
For further information, please contact to our Group N web site
http://www.subaru-sti.co.jp/e/GRN/index.html

IMPREZA WRX STi spec C
Fuji Heavy Industries Applies to the FIA for Group N Homologation
[2004.09.01]
SUBARU TECNICA INTERNATIONAL INC.
3-9-6 Osawa Mitaka Tokyo 181-8577 JAPAN
PHONE : +81 422-33-7848 FACSIMILE : +81 422-33-7844