🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Model Variant:

Turbo & Non-Turbo

Year:

2005

Chassis Code Sti:

GDB

Chassis Code Wrx:

GDA

👋 Introduction

Segment:

Performance Compact / Rally Homologation Special

Reputation:

Renowned for its rallying heritage, potent turbocharged engine, and advanced All-Wheel Drive system

Key Competitors 2005:

Mitsubishi Lancer Evolution, Subaru WRX (non-STI), Ford Focus RS, Honda Civic Type R (in some markets)

Drivetrain:

Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) on STI models

Engine Sti:

EJ257 turbocharged Boxer engine (2.5L)

Engine Wrx:

EJ205 turbocharged Boxer engine (2.0L) or EJ253 naturally aspirated Boxer engine (2.5L) depending on market

Performance Focus:

Emphasis on handling, grip, and driver engagement

Body Style:

Available as a 4-door sedan and 5-door wagon

📋 Manual Details

Coverage Scope:

Comprehensive factory service and repair

Specific Models Covered:

All 2005 Subaru Impreza WRX STI and WRX variants (Turbo and Non-Turbo)

Estimated Pages:

1500+

Type:

Factory Service Manual / Workshop Manual

Language:

English

Digital Format:

PDF (Instant Download)

📖 Manual Coverage

Engine Mechanical:

Complete overhaul, disassembly, assembly, inspection, and repair of all engine components (EJ20/EJ25 series)

Engine Management:

Fuel injection, ignition system, emissions control, ECU diagnostics, sensor testing

Transmission Manual:

Disassembly, inspection, repair, and adjustment of 5-speed and 6-speed transmissions (TY757/TY856)

Transmission Automatic:

If applicable to 2005 WRX/STI models, coverage of automatic transmission service

Drivetrain AWD:

All-Wheel Drive system, center differential, rear differential service and repair

Suspension:

Front and rear suspension components, alignment procedures, shock absorber/strut replacement, bush inspection

Steering:

Power steering system, steering rack, tie rods, alignment

Brakes:

Front and rear brake systems, ABS, EBD, parking brake, hydraulic system service

Electrical System:

Wiring diagrams, component testing, charging system, starting system, lighting, power accessories

Body And Trim:

Exterior and interior trim removal/installation, body panel repair, glass replacement

Heating Ventilation Air Conditioning:

HVAC system diagnosis and repair, refrigerant handling

Safety Systems:

Airbag system diagnosis and servicing

Routine Maintenance:

Oil changes, filter replacements, spark plug service, fluid checks and replacements, belt inspection

Diagnostic Troubleshooting:

System-by-system troubleshooting guides, fault code interpretation, symptom-based diagnostics

Component Replacement:

Step-by-step instructions for replacing virtually all serviceable parts

Engine Rebuild:

Detailed procedures for complete engine disassembly, cleaning, inspection, and reassembly

Transmission Overhaul:

In-depth guidance for complete transmission disassembly and rebuilding

Suspension Geometry:

Wheel alignment specifications and procedures

Electrical Diagnostics:

Testing procedures for all electrical components, including wiring harnesses and connectors

Torque Specifications:

Comprehensive list of all critical torque values for fasteners across all systems

Special Tools:

Identification and usage instructions for Subaru-specific special tools required for certain repairs

Depth:

Factory-level diagnostic and repair procedures

Detail Level:

Includes detailed diagrams, schematics, and exploded views

Target Audience:

Professional technicians and advanced DIY enthusiasts

📊 Manual Specifications

Format:

Digital PDF

Searchability:

Searchable text for quick information retrieval

Printability:

Printable pages

Image Resolution:

High-resolution diagrams and illustrations

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Sti Engine Code:

EJ257

Sti Engine Type:

2.5L DOHC turbocharged Boxer 4-cylinder

Wrx Engine Code:

EJ205 (Turbo) or EJ253 (NA)

Wrx Engine Type:

2.0L DOHC turbocharged Boxer 4-cylinder (EJ205) or 2.5L SOHC naturally aspirated Boxer 4-cylinder (EJ253)

Sti Horsepower Net:

300 hp @ 6000 rpm (JDM/UKDM), 300 hp @ 6000 rpm (USDM)

Sti Torque Net:

290 lb-ft @ 4000 rpm (JDM/UKDM), 290 lb-ft @ 4000 rpm (USDM)

Wrx Horsepower Net:

227 hp @ 5600 rpm (Turbo USDM), 165 hp @ 5600 rpm (NA USDM)

Wrx Torque Net:

217 lb-ft @ 3600 rpm (Turbo USDM), 170 lb-ft @ 4000 rpm (NA USDM)

Fuel Injection:

Multi-point fuel injection (MPI) with Electronic Throttle Control (ETC)

Turbocharger:

IHI VF39 (STI) or TD04L-13T (WRX)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended for STI)

Sti Pistons:

Forged pistons

Sti Connecting Rods:

H-beam connecting rods

Sti Crankshaft:

Nitrided crankshaft

Sti Cylinder Head:

Dual Overhead Camshafts (DOHC) with 4 valves per cylinder

🔧 Transmission

Sti Transmission Type:

6-speed manual (TY856)

Wrx Transmission Type:

5-speed manual (TY757)

Automatic Transmission:

Not typically offered on STI, may be available on some WRX variants in specific markets

Sti AWD System:

Symmetrical AWD with Driver Controlled Center Differential (DCCD)

Wrx AWD System:

Viscous coupling center differential

Manual Transmission Fluid:

Subaru Extra-S Gear Oil (or equivalent API GL-5 75W-90)

Rear Differential Fluid:

Subaru Extra-S Gear Oil (or equivalent API GL-5 75W-90)

Sti Final Drive Ratio:

3.545

📐 Dimensions

Length:

4,485 mm (176.6 in) for Sedan

Width:

1,740 mm (68.5 in)

Height:

1,410 mm (55.5 in) for Sedan

Wheelbase:

2,625 mm (103.3 in)

Sti Curb Weight:

Approx. 1,430 kg (3,153 lbs)

Wrx Curb Weight:

Approx. 1,360 kg (2,998 lbs)

Gvw:

Varies by model and market

🛡️ Safety Features

NHTSA Front Impact:

Not directly rated for 2005 model, but typically performed well in its class.

IIHS Rating:

Not explicitly rated for 2005 model year by IIHS.

Traction Control:

Available on some WRX models, less common on STI (focus on AWD)

Electronic Stability Control:

Not standard on 2005 models

Anti Lock Brakes:

Standard

Electronic Brake Force Distribution:

Standard

Airbags Front:

Driver and front passenger airbags

Airbags Side:

Available as an option or standard on higher trims/later models

Seatbelts:

Three-point seatbelts with pretensioners

Rollover Protection:

Reinforced body structure

💡 Technology Features

Head Unit:

Basic AM/FM/CD player with optional premium audio system

Display:

Digital clock and odometer display

Cruise Control:

Standard

All Wheel Drive System:

Core technology, with advanced DCCD on STI for variable torque split

Auxiliary Input:

Rarely present, typically requires aftermarket modification

Bluetooth:

Not factory equipped

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 6 months (severe duty) / 7,500 miles or 12 months (normal duty)

Engine Oil Filter Replacement:

At every oil change

Spark Plug Replacement:

Iridium spark plugs: 100,000 miles. Platinum: 60,000 miles. (Check specific type for model variant)

Air Filter Replacement:

Every 15,000-30,000 miles or as needed based on driving conditions

Coolant Flush:

Every 30,000 miles or 2 years

Timing Belt Replacement:

105,000 miles or 7 years (for EJ257 and EJ205 engines). Essential maintenance item.

Engine Oil Type:

5W-30 or 10W-30 Synthetic (API SN or higher, ILSAC GF-5 or higher)

Coolant Type:

Subaru Super Coolant (Blue) or equivalent silicate-free, OAT-based antifreeze

Brake Fluid Type:

DOT 3 or DOT 4

Power Steering Fluid:

Subaru Active Power Steering Fluid or equivalent ATF Dexron III

Engine Ringland Failure:

Potential issue on EJ257 engines, especially if poorly maintained or subjected to aggressive driving without proper cooling. Manual will detail inspection procedures.

Clutch Wear:

Wear items, replacement procedures are detailed. STI clutches can be heavy-duty.

Suspension Bushings:

Wear on suspension and differential bushings over time, affecting handling. Manual covers inspection and replacement.

Turbocharger Failure:

Can occur due to oil starvation or age. Manual provides diagnostic steps.

Cracked Exhaust Manifold:

Reported issue on some EJ engines, especially turbocharged ones.

📚 Vehicle History

Subaru Rally History:

Subaru's extensive motorsport heritage, particularly in the World Rally Championship (WRC), heavily influenced the development of the Impreza WRX STI.

Gd Generation:

This 2005 model represents the second generation (GD/GG) Impreza, commonly known as the 'Bugeye' or 'Blobeye' depending on the exact year and market facelift.

Sti Vs Wrx:

The STI variant is a homologation special derived from the rally car, featuring a more potent engine, enhanced drivetrain, and superior suspension tuning compared to the standard WRX.

Manufacturing Location:

Japan

Production Period:

The GD/GG generation ran from 2000 to 2007, with facelifts occurring in 2002 ('Blobeye') and 2005 ('Hawkeye'). This manual covers the 2005 model year updates.

🏆 Awards & Recognition

Motor Trend Import Car Of The Year Impreza:

The Impreza line, including WRX variants, has received numerous accolades over the years for performance and value.

Rally Championships:

Subaru Imprezas (based on this generation) secured multiple WRC Manufacturers' and Drivers' Championships, cementing its performance credentials.

Car And Driver 10Best:

WRX models frequently appeared on Car and Driver's 10Best lists.