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2025
New mods on the way...

2.35 Impreza 
WRX Type R STI Version 5

Technical Build Spec

I’ve owned this car since January 2007. Over the past 18+ years, I’ve made countless modifications, but I’ve always stayed true to one goal: maintaining the car’s standard, factory look, while packing serious performance under the hood.

Engine Spec

2.35 Stroker

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  • J22 Closed Deck Short Block

  • EJ25 K1 Technologies Crankshaft

  • Mahle EJ22 Forged Pistons

  • Carrillo Rods

  • ACL Race Bearings

  • ARP 11mm Head Studs

  • RCM 98mm Headgaskets

  • Superrtech Valve Buckets and Shims

  • JDM Version 8 AVCS Small Port Heads

  • JDM STI Version 8  Camshafts

  • GSC Valve Springs and Retainers

  • RCM Spec C Swin Scroll Group N Baffled Oil Sump Pan

  • Newage Coil on Plug Conversion

  • JTI Coil Pack Conversion Loom

  • Timing Covers (Sprayed Crinkle Red)

  • STI 1.3 Bar Radiator Cap

  • Perrin Lightweight Crank Pulley

Engine Ancillaries

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  • ​Chevron Motorsport Race Spec TMIC (Top Mount Intercooler)

  • Chevron Motorsport Race Radiator and Oil Cooler Kit

  • Chevron Motorsport Thermal Ported Plates

  • Chevron Motorsport Race Spec Swirl Pot with AEM 400 LPH High Flow Fuel Pump

  • Owen Developments GBT6176 Turbo

    • with WRC bearings & oil filter

  • 4" Inner Wing Induction with Roose Silicon Hoses

  • ITG Maxogen Conical Air Filter

  • JDM Version 9 Spec C Inlet Manifold with Version 5 Throttle body with custom Throttle body bracket

  • Teflon Braided Fuel Lines

  • Newton FIA Spec Fuel Tank Vent Valve

  • Turbosmart Fuel Regulator

  • Bachler Racing Parallel Fuel Rails

  • ASNU 900cc Top Feed Injectors

  • Bachler racing WRC Style Oil Filler Cap

  • Fuel Flex Sensor

  • Perrin Air Oil Separator

  • Perrin Turbo Blanket

  • Perrin Electronic Boost Controller

  • Perrin 4 Bar map Sensor

  • Syvecs S6 ECU

  • Walbro LP400 Fuel Pump (in tank)

  • STI Version 8 Power Steering Pump, Pipes and Reservoir

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Exhaust

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  • ​Fujitsubo RM-01A Full Decat Twin Resonator Exhaust

  • RCM Rotated Up and Down Pipe Kit

  • Turbosmart Hypergate 45 External Waste-gate

  • RCM GT Spec Gen 2 Headers & Up Pipe Wrapped

Wheels and Brakes

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Wheels​

  • Rota Grid 17x7.5” ET48 5x100 PCD Bronze

  • Yokohama Advan AD08 R Tyre 225/45/17 94W

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Brakes Front​

  • AP Racing 6 Pot Callipers

  • AP Racing 330mm Grooved Rotors

  • Mintex F4R Brake Pads

  • Goodridge Braided Hoses

  • Castrol SRF Racing Brake Fluid 

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Brakes Rear​

  • Subaru 2 pot​ Callipers

  • Subaru Type R 280mm Rotors

  • Mintex F4R Brake Pads

Fuilds

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Engine​

  • Fuchs Titan Race Pro S 10w-60

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Brakes​

  • Castrol SRF Racing Brake Fluid 

​

Gearbox​

  • Fuchs Titan Sintopoid LS SAE 75W-90

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Rear Diff​

  • Fuchs Titan Sintopoid LS  75W-140

Gearbox & Drivetrain

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  • Exedy Hyper Twin Plate Clutch Kit (incl. Flywheel)

  • Subaru WR1 6 speed DCCD gearbox 

  • Perrin 6 Speed Short Shift Adapter

  • Perrin Shifter Bushing Kit

  • Perrin Rear Shifter Bush

  • Perrin Pitch Stop Mount

  • Perrin R180 Rear Diff Cover

  • SuperPro Rear Differential Support Bracket Mount Bush Kit

  • Subaru  R180 Rear Driveshafts

  • Subaru Version 8 STI Front Driveshafts

Suspension & Handling

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  • JDM Version 8 Quick Rack

  • Chevron Motorsport Custom Modified UJ joint (built from a GC8 and GDB racks)

  • Bilstein B16 Suspension (Chevron Motorport Spec)

  • Whiteline Front Top Mounts

  • Whiteline front and rear adjustable drop links

  • STI Group N Rear Top Mounts

  • Whiteline Anti Lift Kit

  • STI New Age Front Alloy Wishbones

  • JDM STI Version 8 Front and Rear Cross Members

  • SuperPro Bush Kit

  • Chevron Motorsport Bump Steer Control Arms

  • Whiteline 22mm Rear Anti-roll Bar

  • Whiteline 27mm Front Anti-roll Bar 

  • STI Pink Lateral Link Set (Full Pillow)

  • STI Pink Rear Trailing Arms

  • Spec C Rear Stout Mounts

Interior

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  • Dash Sprayed Matt Grey

  • Zero/Sports 60mm Gauge Pod

  • Defi 60mm Gauges (Boost, Oil Pressure, Oil Temperature)

  • Defi Control Unit

  • Perrin Fat Billet Aluminium Shift Knob (Matt Black)

  • STI Aluminium Pedal Set

  • STI Stainless Steel Side Sill Entry Guards

  • Takata FIA 4-Point Harness in Green

  • OMP Velocita Superleggero 3 Spoke Flat 350mm Steering Wheel in Dark Gray Alcantara 

  • Lifeline Quick Group N Release Steering Boss

  • Works Bell Short Hub

  • Syvecs Calibration Switch for 1.2 to 1.9  Bar boost

  • Subaru Dual Cup/Drinks Holder

  • Sony XAV-AX1000 Head Unit

  • ​Alex Interior Roof Vent with Directional Nozzles

Exterior

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  • Stef-Designs.com Bonnet Vent (STI Version 7 design)

  • Impreza Version 6 Front Lip

  • 22B / STI Bonnet Vents

  • STI RA / Limited Roof Vent

  • Billet Roof Vent Catch

  • P1 Drivers Side Fog Cover

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Technical Details

Under Development

Gearbox: TY856WN4KA

6 Speed transmission

Full-time four wheel drive with Driver Control Centre Differential (DCCD)

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1st Gear Ratio:     3.636:1

2nd Gear Ratio:   2.375:1

3rd Gear Ratio:    1.761:1

4th Gear Ratio:    1.346:1

5th Gear Ratio:    0.971:1

6th Gear Ratio:    0.756:1

Reverse Gear Ratio: 3.545:1

​​

Front Differential:    Suretrac Limited Slip

Ring Gear Teeth:      39

Pinion Gear Teeth:   10

Final Drive Ratio:   3.900:1

Rear Drive Transfer Ratio:    1.100:1

Rear Differential:    3.545:1

Performance

ECU: Syvecs S6

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Min Boost: 1.2 bar (17 psi),

Max Boost: 1.9 bar (28 psi),

(Boost can be adjusted in 0.1 bar increments)

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​Actual power figures to be confirmed once new mods have been installed and a full remap and tune conducted.

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BHP: tbc

HP: tbc

PS: tbc

KW: tbc

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Ftlbs : tbc

Nm : tbc

 

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Gallery

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© 2025 EssBonJDM - 2.35 Impreza WRX Type R STI Version 5. - Mar 2025​

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