🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Year:

2009

Chassis Code:

GR/GV

Engine Code:

EJ257

👋 Introduction

Segment:

Performance compact sedan/hatchback, rally-bred sports car.

Competitors:

Mitsubishi Lancer Evolution, Subaru WRX (non-STI), Volkswagen Golf R, Ford Focus RS (later generations).

Drivetrain:

Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD).

Engine Type:

Turbocharged Boxer-4 (EJ257).

Suspension:

Performance-tuned suspension with inverted struts and upgraded components.

Brakes:

Large, high-performance Brembo brakes (front and rear).

Body Styles:

Available as a 4-door sedan (GV) and 5-door hatchback (GR).

📋 Manual Details

Coverage Scope:

Complete service and repair for all 2009 Subaru Impreza WRX STI models and engines.

Estimated Pages:

Over 1500

Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine:

Engine mechanical, lubrication system, cooling system, fuel injection system, ignition system, exhaust system, turbocharger system, engine management system (ECU).

Transmission:

Manual transmission (TY757) maintenance, repair, and overhaul, including clutch system, driveshafts, and differentials.

Brakes:

Brake system diagnostics, repair, and maintenance, including ABS, EBD, brake fluid, pads, rotors, and calipers.

Suspension:

Front and rear suspension systems, shock absorbers, springs, control arms, wheel alignment specifications, and chassis components.

Steering:

Power steering system, steering rack, tie rods, and steering column repair and maintenance.

Electrical:

Complete electrical system diagrams, wiring harnesses, fuses, relays, lighting, power windows, mirrors, audio system, immobilizer, and ECU diagnostics.

Body:

Body panel repair, interior trim, door mechanisms, hood, trunk, bumpers, and collision repair guidelines.

HVAC:

Heating, ventilation, and air conditioning system diagnosis and repair, including refrigerant handling.

Maintenance:

Routine maintenance, oil changes, filter replacements, fluid checks, belt inspections, and spark plug replacement.

Diagnostics:

Troubleshooting guides, diagnostic trouble codes (DTCs), fault finding for all major systems.

Repair:

Step-by-step repair instructions for all major components and systems, including engine rebuild, transmission overhaul, brake replacement, and electrical component repair.

Specifications:

Torque specifications for all fasteners, fluid capacities, clearances, and diagnostic data.

Installation:

Instructions for replacing common wear items and optional accessories.

Depth:

Comprehensive, covering basic maintenance to complete engine and transmission rebuilds, including advanced electrical diagnostics.

📊 Manual Specifications

Searchability:

Fully searchable text for quick access to information.

Resolution:

High-resolution scans for clear diagrams and text.

Quality:

Printable, allowing users to print specific sections or the entire manual.

Type:

N/A (Digital PDF)

Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Engine Code:

EJ257

Configuration:

2.5-liter turbocharged, horizontally opposed (Boxer) 4-cylinder.

Horsepower Hp:

305 hp @ 6000 rpm

Torque Lb Ft:

290 lb-ft @ 4000 rpm

Bore X Stroke:

99.5 mm x 79.0 mm

Compression Ratio:

8.2:1

Redline Rpm:

6700 RPM

Type:

Multi-point fuel injection (MPI) with side-feed fuel injectors.

Fuel Type:

Premium Unleaded Gasoline (91+ octane recommended)

Type:

Twin-scroll turbocharger with intercooler.

ECU:

Engine Control Unit (ECU) with advanced diagnostics.

🔧 Transmission

Type:

6-speed manual transmission (TY757)

Type:

N/A (STI models are manual only)

Dccd:

Driver Controlled Center Differential (DCCD) with manual/auto modes.

Manual Transmission Fluid:

Subaru ExtraS Gear Oil (GL-5) 75W-90 or equivalent.

Manual Transmission Capacity Liters:

2.2 Liters

📐 Dimensions

Wheelbase Inches:

103.0 in

Length Sedan Inches:

179.7 in

Length Hatchback Inches:

173.8 in

Width Inches:

70.9 in

Height Sedan Inches:

57.7 in

Height Hatchback Inches:

58.1 in

Curb Weight Lbs Sedan:

3340 lbs

Curb Weight Lbs Hatchback:

3373 lbs

Wheel Size:

18 x 8.5 inches

Tire Size:

245/40R18

Bolt Pattern:

5x100

🛡️ Safety Features

NHTSA Overall Rating:

Not explicitly rated for 2009 model year by NHTSA, but predecessor models generally performed well.

Traction Control:

Standard Subaru Vehicle Dynamics Control (VDC) system.

ABS:

Standard Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD).

AWD:

Standard Symmetrical All-Wheel Drive (AWD) for enhanced traction and stability.

Airbags:

Front airbags, front side-impact airbags, and side-curtain airbags (standard on most trims).

Seatbelts:

3-point front and rear seatbelts with pretensioners and load limiters.

Crumple Zones:

Engineered crumple zones for improved crash energy absorption.

💡 Technology Features

Audio System:

Standard AM/FM/CD audio system with optional subwoofer and amplifier. Bluetooth connectivity may be optional or aftermarket.

Navigation:

Optional factory navigation system.

Cruise Control:

Standard electronic cruise control.

Keyless Entry:

Standard keyless entry system.

Usb Port:

Typically not standard; often an aftermarket addition.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 3 months (severe driving) / 7,500 miles or 6 months (normal driving). Recommended to check manually for specific recommendations.

Air Filter Replacement:

Every 15,000 miles or 12 months.

Spark Plug Replacement:

Iridium spark plugs recommended replacement at 60,000 miles.

Timing Belt Or Chain:

EJ257 utilizes a timing chain, generally maintenance-free for the life of the engine, but regular inspection for tensioner issues is advised.

Engine Oil Type:

SAE 5W-30 Synthetic (API SN or higher, ILSAC GF-5 or higher recommended).

Engine Oil Capacity Liters:

4.8 Liters (5.1 US Quarts) with filter change.

Coolant Type:

Subaru Super Coolant (Blue) or equivalent. Mixture 50/50 with distilled water.

Brake Fluid Type:

DOT 3 or DOT 4 brake fluid.

Engine Reliability:

Potential for head gasket failures (less common on EJ257 compared to earlier EJ25 variants), piston ring land failures under extreme conditions, and turbocharger wear. Proper maintenance and avoiding excessive revving/harsh conditions are key.

Clutch Wear:

Clutch can wear prematurely with aggressive driving.

Suspension Components:

Bushings and ball joints can wear over time, affecting handling and alignment.

📚 Vehicle History

Subaru Motorsports:

Subaru's rich heritage in World Rally Championship (WRC) racing, influencing the Impreza WRX STI's development.

Generation Designation:

Third Generation (2008-2014), specifically the GR/GV chassis code.

Design Change 2009:

The 2009 model year saw the discontinuation of the sedan body style in North America for the WRX STI, with the hatchback becoming the sole offering for a period, before the sedan returned for later model years.

Manufacturing Location:

Gunma Plant, Japan.

🏆 Awards & Recognition

Automotive Press:

Consistently lauded by automotive journalists for its performance, handling, and rally-inspired capabilities. Often cited as a benchmark in the performance compact segment.