🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STi

Model Code:

GDB

Year:

2006-2007

👋 Introduction

Segment:

Compact Performance Sedan/Hatchback

Target Audience:

Enthusiasts, DIY mechanics, professional workshops specializing in performance Subarus

Key Competitors:

Mitsubishi Lancer Evolution, Honda Civic Si, Volkswagen GTI

Performance Focus:

Designed for the high-performance WRX STi variant, detailing its unique systems

Completeness:

Offers comprehensive coverage for all major vehicle systems and components

Diagnostic Value:

Provides in-depth diagnostic procedures crucial for diagnosing complex performance issues

📋 Manual Details

Coverage Countries:

Global (primary focus on North American specifications)

Language:

English

Format:

Digital Download (PDF)

Estimated Page Count:

2000+

Manual Type:

Complete Workshop Service Repair Manual

📖 Manual Coverage

Powertrain Engine:

2.5L Turbocharged EJ257 Boxer Engine

Powertrain Transmission:

6-Speed Manual Transmission (TY856)

Powertrain Drivetrain:

All-Wheel Drive System (Symmetrical AWD) with DCCD (Driver's Control Centre Differential)

Chassis Suspension:

Front MacPherson Struts, Rear Multi-link Independent Suspension

Chassis Steering:

Power Rack and Pinion Steering

Chassis Brakes:

Front Brembo 4-Piston Calipers, Rear Brembo 2-Piston Calipers, ABS System

Electrical System:

Complete Electrical Schematics, ECUs, Lighting, Ignition, Charging System

Body Exterior:

Body Panel Removal/Installation, Doors, Hood, Trunk, Bumpers

Body Interior:

Dashboard, Seats, Upholstery, Trim Components

HVAC:

Heating, Ventilation, and Air Conditioning System

Safety Systems:

Airbag System, Seatbelt Pretensioners

Routine Maintenance:

Oil Changes, Filter Replacements, Fluid Checks, Spark Plug Replacement

Engine Repair:

Complete Engine Overhaul, Turbocharger Rebuild, Piston/Ring Replacement, Cylinder Head Service

Transmission Repair:

Clutch Replacement, Gearbox Disassembly/Reassembly, Differential Service

Suspension And Steering:

Strut Replacement, Bushing Replacement, Ball Joint Service, Wheel Alignment Procedures

Brake System Service:

Brake Pad/Rotor Replacement, Caliper Service, Brake Line Flush, ABS Bleeding

Electrical Diagnostics:

Wiring Harness Troubleshooting, Sensor Diagnosis, ECU Reprogramming (where applicable), Fault Code Interpretation

Fuel System Repair:

Fuel Injector Service, Fuel Pump Replacement, Fuel Filter Replacement

Cooling System Service:

Radiator Replacement, Water Pump Service, Thermostat Replacement, Coolant Flush

Exhaust System Repair:

Muffler/Catalytic Converter Replacement, Exhaust Manifold Service

Body And Trim:

Panel Alignment, Dent Repair Procedures, Interior Trim Installation/Removal

Troubleshooting Guides:

Comprehensive Diagnostic Flowcharts for Common and Uncommon Issues

Depth Level:

Comprehensive (from basic maintenance to full engine/transmission rebuilds)

Diagnostic Capabilities:

Detailed diagnostic procedures, including specific test values and troubleshooting logic

Special Tool Requirements:

Identification and usage of Subaru-specific and general automotive specialty tools

📊 Manual Specifications

File Type:

PDF

Searchability:

Searchable text for quick information retrieval

Printability:

Printable pages for workshop use

Image Resolution:

High-resolution diagrams and illustrations

Binding:

N/A (Digital Product)

Paper:

N/A (Digital Product)

⚙️ Engine Specifications

Engine Code:

EJ257

Engine Type:

DOHC 16-Valve Turbocharged Boxer

Displacement:

2457 cc (2.5 Liters)

Bore X Stroke:

99.5 mm x 80.0 mm

Compression Ratio:

8.2:1

Horsepower Hp:

300 hp @ 6000 rpm (approx.)

Torque Lb Ft:

300 lb-ft @ 4000 rpm (approx.)

Fuel Type:

Unleaded Gasoline (91+ Octane Recommended)

Fuel Delivery:

Sequential Multi-Port Fuel Injection (MPI)

Turbocharger:

IHI VF39 Ball Bearing Turbocharger

Intercooler:

Top-Mount Air-to-Air Intercooler

🔧 Transmission

Type:

6-Speed Manual

Code:

TY856

Availability:

N/A (Only Manual Offered)

Dccd:

Driver's Control Centre Differential (Manual and Automatic Modes)

Center Differential:

Viscous coupling and electronically controlled mechanical LSD

Rear Differential:

Helical Limited Slip Differential (LSD)

📐 Dimensions

Length:

4415 mm (173.8 in)

Width:

1795 mm (70.7 in)

Height:

1440 mm (56.7 in)

Wheelbase:

2625 mm (103.3 in)

Front Track:

1530 mm (60.2 in)

Rear Track:

1525 mm (60.0 in)

Curb Weight:

1505 kg (3318 lbs) approx.

Gross Vehicle Weight Rating:

1930 kg (4255 lbs) approx.

🛡️ Safety Features

NHTSA Front Impact:

5-Star (Model Year 2006)

IIHS Front Impact:

Good (Model Year 2006)

ABS:

Yes (4-Wheel Anti-lock Braking System)

Traction Control:

Yes (Subaru Vehicle Dynamics Control - VDC)

Brake Bias Control:

Electronic Brake-force Distribution (EBD)

Airbags:

Driver, Passenger, Side Curtain (Front and Rear, depending on trim)

Seatbelts:

3-Point ELR Front and Rear, Pretensioners with Force Limiters

Body Structure:

Reinforced Safety Structure

💡 Technology Features

Audio System:

Factory AM/FM/CD Player with optional subwoofer and amplifier (specifics vary by trim)

Display:

Basic LCD display for radio and climate information

Stability Control:

Subaru Vehicle Dynamics Control (VDC) – integrates ABS, traction control, and active center differential

Aux Input:

Available auxiliary audio input (depending on trim/head unit)

Dccd:

Driver's Control Centre Differential allows manual adjustment of front/rear torque split, enhancing traction and handling dynamics.

Engine Management:

Engine Control Unit (ECU) manages fuel injection, ignition timing, boost pressure, and VDC integration. Manual covers ECU diagnostics and pinouts.

🔧 Maintenance

Oil Change Interval:

Every 3,000-5,000 miles (5,000-8,000 km) or 6 months, especially under spirited driving conditions. Refer to manual for specific severe duty intervals.

Engine Air Filter:

Every 15,000 miles (24,000 km) or 12 months

Spark Plugs:

Iridium type: 60,000 miles (96,000 km)

Transmission Fluid:

Every 30,000 miles (48,000 km) for manual transmission fluid

Differential Fluid:

Every 30,000 miles (48,000 km) for front and rear differential fluid

Engine Oil:

SAE 5W-30 Synthetic (API SN or higher, ILSAC GF-5 or higher recommended). Check owner's manual for specific viscosity based on climate.

Transmission Fluid:

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

Coolant:

Subaru Super Coolant (Blue) or equivalent OAT/HOAT coolant

Brake Fluid:

DOT 3 or DOT 4 (High-performance driving may benefit from DOT 4 or higher)

Piston Ring Land Failure:

Common on early EJ25 engines, particularly if improperly tuned or subjected to detonation. Manual covers inspection and rebuild procedures.

Turbocharger Failure:

IHI VF39 can fail prematurely if oil supply is restricted or maintenance is neglected. Manual details turbo removal and inspection.

Clutch Wear:

High-performance clutch can wear quickly with aggressive driving. Manual provides clutch replacement instructions.

Rear Differential Clunking:

Can be indicative of worn differential bushings or internal wear. Manual covers differential inspection and repair.

Suspension Component Wear:

Bushings and ball joints can wear over time, affecting handling. Manual details suspension component replacement.

📚 Vehicle History

Brand Identity:

Subaru is renowned for its Symmetrical All-Wheel Drive system and horizontally opposed ('boxer') engines, providing a low center of gravity and excellent handling characteristics.

Gd Generation:

This manual covers the 'Bugeye' (pre-facelift 2002-2003) and 'Blobeye' (facelift 2004-2005) as part of the broader GDB platform, with the 2006-2007 models being the final iteration of this highly regarded generation, often referred to as the 'Hawkeye'.

Manufacturing Plant:

Ota City, Gunma Prefecture, Japan

Production Years:

GDB generation: 2000-2007 (MY 2006-2007 specifically for this manual)

🏆 Awards & Recognition

Performance Awards:

Consistently praised by automotive media for its rally-bred performance, handling, and AWD capabilities. Often featured in 'best performance car' lists.

Road And Track Performance:

Recognized for its exhilarating driving experience and track-ready potential.

Automotive Journalism Acclaim:

The 2006-2007 WRX STi is considered a benchmark for affordable all-wheel-drive performance and a cult classic among enthusiasts.