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Impreza 555 Group A cutaway © Prodrive

SUBARU IMPREZA 555 GROUP A TECHNICAL SPECIFICATIONS
ENGINE


Flat four ‘boxer’ quad-cam 16 valve
Bore: 92mm
Stroke: 75mm
Capacity: 1994cc
Compression ratio: 8.8:1
Power: 320-330bhp @ 5500rpm
Power band: 2500-6000rpm
Maximum engine speed: 8000rpm
Torque: 325-339lbft @ 4-5000rpm
Air filter: Ramair
Water injection
Engine bay

TRANSMISSION


Prodrive 6 speed semi-auto pneumatic paddle-shift + regular H pattern
Front diff: Active
Centre diff: Active
Rear diff: Mechanical/locked
Clutch: AP carbon

TURBOCHARGER


IHI VF15 RHB52with FIA regulation 34mm restrictor
Maximum boost: 3 bar @ 2500rpm

CONTROL AND DISPLAY UNITS


Engine: FHI/STI
Datalogging: GEMS
Rally computer: Coralba
Driver’s instruments: Stack ST400 0-8000 tachometer
VDO water temperature gauge
Dashboard

EXHAUST


3″ straight pipe with catalytic converter + optional 5″ rear silencer (98dba)

FUEL SYSTEM


75 litre boot-mounted safety tank
Bag tank installation inside boot

SUSPENSION


Bilstein MacPherson struts
Springs:
Tarmac: (F) 400-600 (R) 250-450
Gravel: (F)160-275 (R)130-200

Anti roll bars:
(F mm) 15 17 20 25 28 28.5 30
(R mm) 15 17 20 22 25 30

WHEELS


Speedline
Tarmac: 18×8″ SL856 (Type 2013)
Gravel: 15×7″ SL846 (Type 2011)
Snow: 16×5.5″ SL846 (Type 2011)
Gravel Speedline SL846 and Front AP Brakes Tarmac Speedline SL856 and Front AP Brakes

BRAKES


AP Callipers and vented discs
Front Rear
Tarmac: 366mm 6 pot * 304mm 4 pot
Gravel: 304mm 4 pot 304mm 4 pot
Snow: 330mm 4 pot 304mm 4 pot
* optionally water cooled
Pads:
Pagid RS44 Orange
Pagid RS12 Grey
Pagid RS42 Blue

CAR DIMENSIONS


Length: 4340mm
Width: 1690mm
Height: 1405mm
Wheelbase: 2520mm
Front track: 1465mm
Rear track: 1465mm
Weight: 1230kg FIA regulation minimum

FIA HOMOLOGATION


Group A: A5480
Validity: 1st April 1993 to 31st December 2010
© STi Japan

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