🏷️ Basic Information

Make:

Subaru

Model:

Impreza

Year:

2005

Trim Level:

WRX STI (GD chassis)

Engine Variants Covered:

2.0L Turbo EJ207 (JDM/EDM), 2.5L Turbo EJ257 (USDM/AUDM)

Chassis Code:

GDB (for STI models)

Engine Codes:

EJ207, EJ257

👋 Introduction

Positioning:

The 2005 Subaru Impreza WRX STI (GD chassis) is a highly regarded performance compact car, known for its rally-bred all-wheel-drive system, turbocharged boxer engines, and agile handling. This manual caters to enthusiasts and professional mechanics alike who seek to maintain, repair, or modify these iconic vehicles.

Competitors 2005:

Mitsubishi Lancer Evolution, Ford Focus RS (in relevant markets), Volkswagen Golf GTI (less performance-oriented but segment competitor).

Vehicle Highlight:

Symmetrical All-Wheel Drive, DCCD (Driver Controlled Center Differential), turbocharged Boxer engine, strong aftermarket support.

Value:

This manual provides the comprehensive technical knowledge required to service the 2005 Impreza STI, covering both mechanical and electrical aspects in detail, making it an indispensable tool for owners and technicians.

📋 Manual Details

Engine Mechanical:

Yes

Engine Performance:

Yes

Fuel System:

Yes

Ignition System:

Yes

Cooling System:

Yes

Exhaust System:

Yes

Transmission Manual:

Yes

Transmission Automatic:

No (Typically not for STI models, but confirmation would depend on specific manual)

Drivetrain:

Yes

All Wheel Drive System:

Yes (DCCD, differentials)

Suspension:

Yes

Steering System:

Yes

Brake System:

Yes

Electrical System:

Yes

Body And Interior:

Yes

HVAC System:

Yes

Safety Restraint Systems:

Yes (Airbags, Seatbelts)

Diagnostic Troubleshooting:

Yes

Torque Specifications:

Yes

Wiring Diagrams:

Yes

Estimated Pages:

Refer to product listing for exact count, but typically thousands for a comprehensive workshop manual.

Type:

Workshop Service and Repair Manual

Language:

English (Likely, based on typical product offerings)

Format:

Digital (PDF, likely)

Printability:

Printable pages

📖 Manual Coverage

Engine Management:

ECU, sensors, actuators, emissions control

Turbocharger System:

Inspection, repair, replacement, intercooler

Clutch System:

Operation, inspection, replacement

Power Steering:

Hydraulic pump, rack and pinion, fluid service

Anti-Lock Braking System:

ABS module, sensors, pump, bleeding procedures

Air Conditioning:

Refrigerant, compressor, condenser, evaporator, service

Lighting System:

Headlights, taillights, interior lights, bulb replacement

Instrumentation And Gauges:

Speedometer, tachometer, warning lights, sensor diagnostics

Routine Maintenance:

Oil changes, filter replacements, spark plug service, fluid checks

Engine Rebuild:

Complete disassembly, inspection, repair, and reassembly

Transmission Overhaul:

Component replacement, gear set inspection, synchronizer service

Brake Pad And Rotor Replacement:

Step-by-step guide with torque values

Suspension Component Replacement:

Struts, shocks, ball joints, control arms

Electrical Component Testing:

Alternator, starter, battery, ECU testing

Troubleshooting Guide:

Common symptoms and their causes, diagnostic flowcharts

Body Panel Replacement:

Fenders, doors, bumpers

Interior Trim Removal And Installation:

Dashboard, door panels, seats

Wheel Alignment Procedures:

Specifications and adjustments

Depth:

Comprehensive: Covers everything from basic maintenance to complete engine and transmission overhauls, including advanced diagnostics and electrical troubleshooting.

📊 Manual Specifications

Format:

PDF (Portable Document Format)

Image Resolution:

High-resolution, suitable for clear printing of diagrams and photos.

Binding:

N/A (Digital format)

Paper Quality:

N/A (Digital format, but designed for printing on standard paper)

Text Search:

Likely searchable text for quick information retrieval.

⚙️ Engine Specifications

Engine Type Jdm Edm:

EJ207, 2.0L Flat-4 DOHC Turbocharged Boxer

Engine Type Usdm Audm:

EJ257, 2.5L Flat-4 DOHC Turbocharged Boxer

Horsepower Ej207:

Approximately 261 hp @ 6000 rpm (JDM/EDM variations apply)

Torque Ej207:

Approximately 258 lb-ft @ 4000 rpm (JDM/EDM variations apply)

Horsepower Ej257:

Approximately 300 hp @ 6000 rpm (USDM/AUDM)

Torque Ej257:

Approximately 300 lb-ft @ 4000 rpm (USDM/AUDM)

Fuel Delivery:

Multi-point Fuel Injection (MPI) with sequential firing

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher recommended)

Ignition Type:

Distributorless Ignition System (DIS) with coil-on-plug

Coolant Type:

Subaru Super Coolant (Blue) or equivalent silicate-free ethylene glycol-based coolant

Oil Capacity Ej207:

Approx. 4.8 US quarts (4.5 liters) with filter change

Oil Capacity Ej257:

Approx. 5.8 US quarts (5.5 liters) with filter change

Recommended Oil Viscosity:

5W-30 or 10W-30 (depending on climate, consult manual for specifics)

🔧 Transmission

Transmission Type:

6-speed Manual Transmission (TY856)

Automatic Transmission:

Not typically offered on WRX STI models of this generation.

Dccd:

Driver Controlled Center Differential (manual or auto modes)

Manual Transmission Fluid:

Subaru Extra-S Gear Oil or equivalent API GL-5, SAE 75W-90

Manual Transmission Capacity:

Approx. 3.2 US quarts (3.0 liters)

📐 Dimensions

Length:

Approx. 173.8 inches (4415 mm)

Width:

Approx. 69.1 inches (1755 mm)

Height:

Approx. 56.7 inches (1440 mm)

Wheelbase:

Approx. 100.1 inches (2540 mm)

Curb Weight:

Approx. 3200-3300 lbs (1450-1500 kg), varies by market and specific equipment

Cargo Volume:

Approx. 11.6 cu ft (sedan variant)

🛡️ Safety Features

NHTSA Front Impact:

5-Star (driver and passenger, for models tested)

IIHS Crash Test Ratings:

Good (for models tested)

Active Safety Systems:

ABS, EBD (Electronic Brakeforce Distribution), Symmetrical AWD, DCCD.

Passive Safety Features:

Front airbags, Side-impact airbags (optional/market dependent), front seatbelt pre-tensioners, crumple zones.

💡 Technology Features

Audio System:

Factory premium audio system with CD player, radio. Manual covers unit removal and basic electrical connections.

Driver Assistance Features:

ABS, EBD, DCCD are primary electronic aids. Limited other electronic driver aids common in modern vehicles.

Connectivity Options:

No integrated Bluetooth or navigation in standard factory configuration for this model year. Aftermarket installations covered by general electrical principles in the manual.

🔧 Maintenance

Oil Change Interval:

Every 3,000-5,000 miles or 6 months, whichever comes first (recommendation for high-performance driving).

Spark Plug Replacement:

Typically every 60,000 miles for iridium spark plugs, or as per manual recommendations.

Timing Belt Replacement:

Around 90,000-105,000 miles for EJ engines (critical item, consult manual for exact interval and recommended replacement parts).

Brake Fluid Type:

DOT 3 or DOT 4, consult manual for specific recommendation.

Power Steering Fluid:

ATF Dexron III or Subaru's recommended power steering fluid.

Ej257 Ringland Failure:

Known issue in early EJ257 engines, particularly with aggressive tuning or poor maintenance. Manual will detail engine inspection procedures.

Clutch Wear:

Can be accelerated with aggressive driving, manual covers clutch inspection and replacement.

Turbocharger Failure:

Requires proper oil changes and warm-up/cool-down procedures; manual covers inspection and maintenance.

📚 Vehicle History

Subaru Rally History:

Subaru's deep roots in motorsport, particularly the World Rally Championship (WRC), heavily influence the Impreza WRX STI's design and engineering.

Gd Chassis Generation:

The 2005 model is part of the second generation (GD/GG) Impreza, often referred to as the 'Bugeye' (pre-facelift) or 'Blobeye' (facelifted) depending on the specific build date within the generation. The 2005 model year is part of the 'Blobeye' facelift.

Manufacturing Locations:

Japan (Ota, Gunma Prefecture)

Production Years Gd Chassis:

2000-2007 (with facelifts in 2002 and 2005)

🏆 Awards & Recognition

Car And Driver 10Best:

The Impreza WRX and STI models have historically been recognized by automotive publications like Car and Driver for their performance and handling capabilities.

Rally Heritage Impact:

Strong reputation due to Subaru's success in WRC, translating to enthusiast demand and perceived performance.