Roger Clark Motorsport
Subaru Impreza as modified by Roger Clark Motorsport. This is based on an article which appeared in EVO Magazine in October 2005, written by Phil Royle
Introduction
The Roger Clark Motorsport Subaru Impreza WRX STi is fully road legal even though the car lays claim to the following figures. 9.84secs 1/4 mile @ 143mph, its 2 litre engine develops
709bhp@7500rpm and 620lbs/ft even without the use of its 150bhp nitrous oxide system.
Roger Clark Motorsport Impreza
The car is built up from a bare shell, where a roll cage is installed, Kevlar bucket seats, MOTEC LCD data display, Nitrous Oxide System, Ohlins coil over dampers with remote reservoirs, a bespoke AP Racing big brake kit, Lightweight OZ Superleggeras to name just a handful of the performance parts used.
Engine
The bottom end in the Roger Clark Subaru Impreza is a forged steel item, the rods are elongated and connect to custom spec pistons, the cylinder heads are ported and polished and are installed with WRC titanium valve gear and suitably extreme camshafts. Fuelling is taken care of by a custom fuel cell from which 2 pumps draw fuel with the petrol being forced into the engine through 8 injectors. The inlet manifold is the exact same design as that found on the WRC Subaru Impreza, this is fed from short, lag free hard pipes leading from a massive front mounted intercooler with water spray.
Turbo
This Subaru Impreza uses a Garrett GT3040 turbo with features state of the art ball bearing technology and is mount mounted on a bespoke twisted exhaust manifold with an external waste gate with the exhaust gases exiting through a custom de catted exhaust system. The whole engine is managed by MOTEC electronics with all the mapping having been carried out by Roger Clark Motorsport themselves.
Transmission
To cope with the mega output of this Impreza engine, the Subaru transmission is totally overhauled with a Modena 6 speed dog box with straight cut gears, high grade clutch, lightweight flywheel, carbon fibre prop shaft, plated LSD and an electronic diff control.
Driving the Monster
The Roger Clark Subaru Impreza retains its flat four rumble, blip the throttle and the revs rise and fall rapidly, smoothly and deafeningly. Engaging the clutch and burying the throttle results in unbelievable acceleration which leaves your body left to fight the crushing G Forces, each new gear unveiling another slug of acceleration. And all this from a 2 litre engine. Price for this conversion is on request.
Links
Roger Clark Motorsport
Forums
SIDC
ScoobyNet
ScoobyMods
For insurance quotes see the High Performance Car Insurance section
Redline mini feature of the Roger Clark Motorsport built Team Ice Subaru Impreza
Roger Clarke Motorsport now have a new demo car. This model produces 605bhp
Photo courtesy of timeattack.co.uk
Specs:
ENGINE
2L 16ν QUAD CAM EJ20 ENGINE
CLOSED-DECK SUBARU BLOCK
WRC R-PROFILE HIGH WRAP CAM ΒΕLΤ SYSTEM
MODIFIED ΟIΙ PUMP
WRC S10 ΙΝLΕΤ MANIFOLD. ElGHT INJECTOR ΚΙΤ
72 ΜΜ ΤΗRΟΤΤΙΕ ΒΟΟΥ
5.5-LlTER ΑLLΟΥ SUMP
ΟIL CATCH ΤΑΝΚ ΑΝD BREATHER SYSTEM
SUBARU S202 ΟIL COOLER
GOODRICH ΒRAIDED VACUUM HOSES
INTERNALS
EXTREME ARROW Η- SECTION RODS
STEEL ΒΙLLΕΤ CRANKSHAFT
OMEGA CERAMIC-COATED FLAT-TOP PISTONS 9.75:1 COMPRESSION
ΡΑRΤΕD STI 4 CYLINDER HEADS MODIFIED FOR LΟΒΕ CLEARANCE. FITTED WITH WRC/RCMS A-RING ΗΕΑD GASKETS ΑΝΟ GAS RINGS
RCMS CAMSHAFTS EXHAUST 270-DEGREE 1Ο.5ΜΜ LIFT. ΙΝLΕΤ 290-DEGREE DURΑΤΙΟΝ ΑΝD 0.5ΜΜ LIFT
ONE-PlECE NIMONIC EXHAUST VALVES
ΟΝΕ PIECE STAINLESS ΙΝLΕΤ VALVES
UPRΑΤΕD VALVE SPRINGS
PLASMA ΝΙΤRΙDΕD ΤΙΤΑΝIUΜ SPRING CAPS
WRC ΜΑΙΝ ΑΝD BIG ΕΝD BEARINGS
INDUCTION
GARRET GT40/88 TWIN SCROLL TURΒΟ RUNNING 2.1-BAR BOOST
I.C.E. ADJUSTABLE BOOST (1.2 TO 2.1 ΒΑR)
Κ&Ν AIR FILTER WITH 1Ο0ΜΜ ΙΝLΕΤ TRUMPET
RCMS HIGH-FLOW 100ΜΜ THICK FRONT-MOUNT INTERCOOLER WITH TWIN-TUBE CORE
70ΜΜ STAINLESS STEEL INTERCOOLER PIPEWORK
WIZARDS OF NOS dIRECT-PORT NITROUS KIT SET FOR 100ΒΗΡ lNCREASE
FUELLING
8 Χ 700CC INJECTORS
BLUEPRINTED BOSCH 044 FUEL PUMPS (200-LITRE ΡΕR PUMP)
SX FUEL REGULATORS SET ΑΤ 4-BAR STATIC PRESSURE
GOODRIDGE FUEL FEED ΡΙΡΕ
GOODRIDGE FUEL RETURN ΡΙΡΕ
RCMS FUEL DISTRIBUTION BLOCK
FIA SPEC 28-LlTER RUBBER/KEVLAR BAG FUEL ΤΑΝΚ ΙΝ ALUMINUM COVER
VΡ120 RACE FUEL
ENGINE MANAGEMENT
Μ800 MOTEC ECU WITH TRACTlON CONTROL. NITROUS CONTROL. ANTI-LAG. ΡΑDDLΕ SHIFT CONTROL ΑΝD FULL DΑΤΑ LOGGING
EXHAUST
WRC SHORT RUNNER CERAMIC COATED EXHAUST MANIFOLD
ΤΙΑL 45 ΜΜ ΕΧΤΕΑΝΑL WASTEGATE
3.5-INCH UNSILENCED STAINLESS STEEL SYSTEM WITH CERAMIC COATED DOWNPIPE
DRIVETRAIN
R180 STI REAR ΑΧLΕ 3.91 CWP ΑΝD ΡLΑΤΕD ΜΟDΕΝΑ
LSD DIFFERENTIAL
GKN RΑLLΥ DRIVESHAFTS
TOROUE LΙΝΕ CARBON-FIBRE PROPSHAFT
RCMS SIX-SPEED SUBARU GEARBOX CASING MODIFIEO FOR SEQUENTIAL GEARBOX SYSTEM
SIX-SPEED ΜΟDΕΝΑ GEAR ΚΙΤ
SUBARU 3.9:1 FRONT CWP
RCMS ΡΑDDLΕ SHIFT SYSTEM
ΡLΑΤΕD CENTER DIFFERENTIAL WITH 1:1 UΡRΑΤΕD OUTPUT ΜΟDΕΝΑ GEARS
ΡLΑΤΕD FRONT ΜΟDΕΝΑ DIFFERENTIAL
RCMS SPEC ΤRIPLE-ΡLΑΤΕ OS GIKEN CLUTCH ΑΝD FLYWHEEL
RCMS HYDRAULlC LIGHT PRESSURE SYSTEM
BRAKES
FRONT ΑΡ RACING 355ΜΜ OISCS ΑΝΟ SIX-POT CALIPERS
RΕΑR ΑΡ RACING GP N 270ΜΜ OISCS ΑΝΟ FOUR-POT CALIPERS
FERODO DS3000 RACING PADS
RCMS HYDRAULlC CARBON ΗΑΝD ΒRΑΚΕ
-3 STAINLESS STEEL GOODRIDGE ΡΙΡΕ WORK ΑΝD QUICK RELEASE FITTINGS
BIAS ΡΕDΑL ΒΟΧ WITH DASH-MOUNTED ADJUSTER
QUICK CHANGE ΒRΑΚΕ BIAS ADJUSTER ΟΝ CENTER CONSOLE
QUICK-RELEASE DRΥ ΒRΑΚΕ FLUID CONNECTlON
SUSPENSION
WRC SPEC EXE-TC FULLY ADJUSTABLE DAMPERS WITH HIGH- ΑΝD LOW-SPEED BUMP ΑΝD REBOUND ADJUSTMENT
350-POUND FRONT SPRINGS ΑΝD 325-POUND REARS
STI ROSE-JOINTED RΕΑR LΑΤΕRΑL LlNKS
STI ROSE JOINTED REAR TRAILING LINKS
EXE-TC ΒΟΤΤΟΜ ROSE JOINTED UPRIGHT BUSHES
STI ΑLLΟΥ FRONT ARMS
STI QUICK-STEER STEERING RACK
RCMS ADJUSTABLE ROSE JOINTED ARMS FRONT ΑΝD RΕΑR
RCMS FULLY ADJUSTABLE ΤΟΡ MOUNTS
WHEELS AND TYRES
8.5Χ18 DYMAG CARBON MAGNESIUM ALLOYS
245/40-18 MICHELIN ΡΙLΟΤ SPORT CUP ΑΝD ΤΟΥΟ R888 TIRES
EXTERIOR
WRC STEEL ARCHES ΑΝD SKIRTS
WRC FRONT ΑΝD REAR BUMPERS
WRC CARBON REAR SPOILER WITH ΑDDΙΤΙΟΝΑL WING SUPPORTS
STI ΑLLΟΥ ΒΟΝΝΕΤ WITH 22Β VENTS
RCMS CARBON VΕΝΤ
WRC FRONT VΕΝΤ ΑΝD RCMS GAS STRUTS
ΗΕΑΤΕD FRONT SCREEN
WRC NON-HEATED LlGHTWEIGHT RΕΑR SCREEN
MODIFIED FRONT ΑΝD RΕΑR ΙΝΝΕR ARCHES
SEMI-TUBBED FRONT ARCHES
SEMI SEAM-WELDED CHASSIS
CARBON-FIBRE RACE MIRRORS
MOTEC DΑΤΑ LOGGING TRANSPONDER MOUNTED ΙΝ DRIVERS WING MIRROR
22Β ΑLLΟΥ WING BADGE ΟΝ FRONT GRILLE
INTERIOR
FIA GPN Τ45 ΜULΤΙΡΟΙΝΤ WELDED-IN ROLLCAGE
MOTEC DIGITAL DASHBOARD
DEFI TURBO/FUEL PRESSURE GAUGES
CARBON KEVLAR RECARO SPA PRO SEATS
SABELT SIX-POINT HARNESS
WRC RΟLLΕR BEARING SINGLE-PlECE STEERING COLUMN
ΜΟΜΟ STEERING WHEEL
RCMS SEQUENTIAL GEAR STICK WITH REVERSE LOCK OUT MECHANISM
RCMS STEERING WHEEL MOUNTED ΡΑDDLΕ SHIFTERS
FULL PLUMBED-IN FIRE EXTINGUISHER SYSTEM
RCMS CARBON-FIBRE DOOR CARDS
Related External Links:
see also:
subaru tuners
subaru impreza gc8 buying guide
subaru impreza history
subaru impreza insurance specialists
track day organisers
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