SUBARU IMPREZA WRX STI Full Service & Repair Manual 2006-2007

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Model Generation: Third Generation (GR/GV) Model Years Covered: 2006-2007 Codes Chassis Codes: GDB (for 2006-2007 models, specifically variations within this...

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UGS: 388859

Mots clés: 2006 2007 Car Cars IMPREZA WRX STI Misc Subaru

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Model Generation:

Third Generation (GR/GV)

Model Years Covered:

2006-2007

Codes

Chassis Codes:

GDB (for 2006-2007 models, specifically variations within this generation)

👋 Introduction

Market Position

Segment:

Performance Compact Sedan/Hatchback (based on Impreza platform)

Competitors 2006-2007:

Mitsubishi Lancer Evolution, Subaru WRX (non-STI variants), Subaru Legacy GT, Honda Civic Si, Volkswagen GTI, Mazda Mazdaspeed3.

Competitive Analysis

Key Differentiators:

Symmetrical All-Wheel Drive, turbocharged boxer engine, rally-bred heritage, Driver Controlled Center Differential (DCCD).

Key Features

Performance Focus:

Designed for enthusiasts seeking high performance, handling, and all-weather capability.

Durability And Reliability:

While performance-oriented, the STI is built with robust components for demanding driving conditions.

Manual Value Proposition:

Provides in-depth technical knowledge for DIY enthusiasts and professional mechanics to maintain and repair the WRX STI efficiently.

📋 Manual Details

Coverage Areas

Primary Regions Covered:

Global (factory specifications applicable to North American, European, and Japanese markets, with specific regional variations noted where applicable)

Page Count

Estimated Page Count:

1000+ (typical for comprehensive factory service manuals of this era)

Manual Type

Type:

Factory Service Manual / Workshop Manual / Repair Manual

Language

Language:

English

Format

Format:

Digital Download (PDF)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Complete engine overhaul, internal components (pistons, connecting rods, crankshaft, camshafts, valves), timing belt/chain, cylinder heads, lubrication system, cooling system.

Engine Performance Tuning:

ECU tuning principles, fuel injection control, ignition timing, turbocharger operation and diagnosis, intercooler system.

Fuel System:

Fuel pump, fuel injectors, fuel lines, fuel pressure regulator, evaporative emission control (EVAP) system.

Exhaust System:

Exhaust manifold, catalytic converter, mufflers, oxygen sensors, emissions controls.

Transmission Manual:

Clutch system, gear selection, internal transmission components, differential, driveshafts, maintenance and repair.

Transmission Automatic:

N/A (This manual specifically covers WRX STI manual transmissions)

All Wheel Drive System:

Center differential (Driver Controlled Center Differential - DCCD), viscous coupling, drivetrain components, maintenance and diagnosis.

Suspension System:

Front and rear struts, springs, control arms, bushings, sway bars, alignment specifications, and procedures.

Steering System:

Power steering pump, rack and pinion assembly, steering column, linkages, troubleshooting.

Brake System:

Brake calipers (including Brembo on STI), rotors, pads, ABS system, brake fluid specifications, bleeding procedures, parking brake.

Electrical System:

Battery, alternator, starter, wiring diagrams, fuses, relays, lighting systems, ignition system.

Engine Control Module ECM:

ECU functions, sensor inputs and outputs, diagnostic trouble codes (DTCs), sensor calibration, idle control.

Body And Chassis:

Body panel removal and installation, door mechanisms, glass, interior trim, chassis components, corrosion protection.

HVAC System:

Air conditioning system, heater core, blower motor, controls, refrigerant handling and charging.

Safety Systems:

Airbag system, seatbelts, SRS (Supplemental Restraint System) diagnosis and repair.

Procedures Included

Routine Maintenance:

Oil and filter changes, fluid checks and top-offs, tire rotations, brake inspections, air filter replacement.

Troubleshooting Diagnostics:

Systematic diagnostic charts for common and uncommon issues, DTC interpretation, component testing procedures.

Engine Repair:

Complete engine rebuild procedures, head gasket replacement, piston ring installation, bearing replacement.

Transmission Overhaul:

Detailed steps for disassembling and reassembling the manual transmission, including gear replacement and synchro ring servicing.

Suspension Replacement:

Strut and shock absorber replacement, bushing renewal, steering component replacement.

Brake Service:

Pad and rotor replacement, caliper servicing, bleeding procedure for ABS-equipped vehicles.

Electrical Diagnostics:

Wiring harness troubleshooting, component testing using multimeters and oscilloscopes, power and ground testing.

Turbocharger Maintenance:

Inspection, lubrication, and potential repair/replacement procedures for the turbocharger unit.

Dccd Adjustment And Repair:

Procedures for diagnosing and potentially adjusting or repairing the Driver Controlled Center Differential system.

Body Panel Repair:

Guidelines for the removal, installation, and adjustment of body panels, doors, and trim.

Technical Depth

Depth:

Comprehensive. Covers everything from basic maintenance to complete engine and transmission rebuilds, including electrical system diagnostics and bodywork.

Diagnostic Tools:

Details required diagnostic tools, scan tool protocols (OBD-II), and specialized Subaru diagnostic equipment.

Torque Specifications:

Exact torque values for all critical fasteners, critical for engine assembly, suspension, and chassis components.

Clearances And Tolerances:

Specifications for engine bearing clearances, piston ring gaps, valve lash, and other critical mechanical tolerances.

Wiring Diagrams:

Detailed, color-coded wiring diagrams for all electrical systems, including engine control, body electrical, and chassis electronics.

Special Tools:

Lists and descriptions of Subaru-specific special tools required for certain repair procedures.

📊 Manual Specifications

File Format

File Type:

Searchability:

Text-searchable PDF for quick information retrieval.

Print Quality

Quality:

High resolution, suitable for printing specific sections or the entire manual.

Binding Type

Binding:

N/A (Digital Download)

Paper Type

Paper:

N/A (Digital Download)

Compatibility

Device Compatibility:

Compatible with computers, tablets, and smartphones via PDF reader applications.

⚙️ Engine Specifications

Primary Engine

Engine Code:

EJ257

Engine Type:

2.5L DOHC 16-valve turbocharged flat-four (Boxer)

Performance

Horsepower:

300 hp @ 6000 rpm (approximate, varies slightly by market/spec)

Torque:

300 lb-ft @ 4000 rpm (approximate, varies slightly by market/spec)

Fuel System

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Turbocharger:

IHI VF39 (or similar twin-scroll turbocharger)

Intercooler:

Top-mounted air-to-air intercooler

Recommended Fuel

Octane Rating:

Premium Unleaded (91+ Octane)

🔧 Transmission

Standard

Type:

6-speed Manual Transmission

Drivetrain:

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

Optional

Type:

N/A for WRX STI models in these years

Features

Dccd Modes:

Manual and Automatic modes for center differential locking force.

📐 Dimensions

Exterior

Body Styles:

4-door Sedan, 5-door Hatchback

Length Sedan:

Approx. 179.5 inches

Width:

Approx. 70.1 inches

Height Sedan:

Approx. 57.0 inches

Weights

Curb Weight:

Approx. 3300-3400 lbs (depending on body style)

🛡️ Safety Features

Ratings

NHTSA Front Impact:

5-star (for driver and front passenger, based on 2006 model year Impreza ratings which WRX STI shares platform with)

IIHS Side Impact:

Good (for 2006 model year Impreza ratings)

Active Features

Standard Anti-lock Braking System (ABS)

Traction Control:

Standard Traction Control System (TCS)

Electronic Stability Control:

Standard Electronic Stability Control (VDC - Vehicle Dynamics Control)

Passive Features

Airbags:

Frontal airbags, side-impact airbags, curtain airbags (depending on trim).

Seatbelts:

3-point front and rear seatbelts with pretensioners.

💡 Technology Features

Infotainment

Audio System:

Standard CD player with AM/FM radio, often with auxiliary input. Optional premium sound systems available.

Driver Assistance

ABS Ebd:

ABS with Electronic Brakeforce Distribution (EBD).

Dccd:

Driver Controlled Center Differential provides adjustable torque split for enhanced traction and handling.

Connectivity

Auxiliary Input:

Standard 3.5mm auxiliary audio input.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,000-5,000 miles or 6 months, depending on driving conditions (severe vs. normal).

Timing Belt Replacement:

105,000 miles or 7 years (refer to manual for specific EJ257 timing belt replacement details and associated components like water pump and idlers).

Fluid Specifications

Engine Oil:

SAE 5W-30, API SJ or higher, ILSAC GF-3 or higher (e.g., Mobil 1 5W-30 Synthetic, Castrol Syntec 5W-30).

Coolant:

Subaru Super Coolant (blue) or equivalent ethylene glycol-based coolant with long-life additives.

Brake Fluid:

DOT 3 or DOT 4 brake fluid.

Transmission Fluid:

75W-90 GL-5 Gear Oil (for manual transmission).

Rear Differential Fluid:

75W-90 GL-5 Gear Oil.

Known Issues

Engine Reliability:

Head gasket failures (though less common on EJ257 than earlier EJ25s), piston ring land failure due to detonation or inadequate fueling, turbocharger failures, oil leaks from seals.

Clutch Wear:

Clutch wear can be accelerated with aggressive driving or track use.

Suspension Component Wear:

Bushings and end links can wear over time, affecting handling.

📚 Vehicle History

Brand Heritage

Rally Roots:

Subaru's legendary success in the World Rally Championship (WRC) directly influenced the development and tuning of the WRX and WRX STI models.

Model Evolution

Third Generation Transition:

The 2006-2007 models represent a transitional period for the Impreza and WRX STI, leading into the GR/GV chassis. This generation (GDB) saw stylistic and mechanical refinements.

Production

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Car And Driver તિહાસિક:

Consistently featured on Car and Driver's '10Best' lists in previous generations, establishing its performance reputation.

Ratings

Sport Compact Car Awards:

Frequently recognized by automotive publications for its performance, handling, and rally-inspired capabilities.

Certifications

Manual Certification:

Factory Original (derived from Subaru's official service documentation).