2008 Subaru Impreza Wrx Sti Service Workshop Repair Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2008 Codes Chassis Code: GR/GV Engine Code: EJ257 👋 Introduction Market Position Vehicle Segment: Compact sports sedan/hatchback Target Audience:...

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Codes

Chassis Code:

GR/GV

Engine Code:

EJ257

👋 Introduction

Market Position

Vehicle Segment:

Compact sports sedan/hatchback

Target Audience:

Enthusiasts, performance-oriented drivers, rally-inspired vehicle owners

Competitive Analysis

Key Competitors:

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

Key Features

Performance Orientation:

Symmetrical All-Wheel Drive (AWD), turbocharged Boxer engine, performance-tuned suspension

Rally Heritage:

Direct lineage from Subaru's successful World Rally Championship (WRC) cars

📋 Manual Details

Coverage Areas

Manual Scope:

Comprehensive service, repair, and diagnostic information

Page Count

Estimated Page Count:

Over 2000 pages (typical for comprehensive factory service manuals)

Manual Type

Manual Format Type:

Factory Service Manual / Workshop Manual / Repair Manual

Language

Language:

English

Format

Delivery Format:

Digital (PDF)

📖 Manual Coverage

Systems Covered

Engine System:

Engine mechanical, lubrication, cooling, fuel, ignition, emissions, starting, charging

Transmission System:

Manual transmission (TY856), clutch system, drivetrain components (driveshafts, differentials)

Braking System:

Front and rear brakes (Brembo calipers), ABS, brake fluid, parking brake

Suspension System:

Front and rear suspension (MacPherson struts front, double wishbone rear), alignment, steering components

Electrical System:

Wiring diagrams, lighting, instruments, audio system, power accessories, fuses, relays, battery, starter, alternator

Body And Chassis:

Body construction, interior trim, exterior trim, doors, windows, glass, safety systems (airbags), frame and structure

HVAC System:

Heating, ventilation, and air conditioning system diagnosis and repair

ECU And Sensors:

Engine Control Unit (ECU) diagnosis, sensor readings, wiring, diagnostic trouble codes (DTCs)

Procedures Included

Maintenance Procedures:

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

Repair Procedures:

Engine overhaul, transmission rebuild, brake caliper replacement, suspension component replacement, turbocharger service

Troubleshooting Procedures:

Step-by-step diagnostic guides for common and complex issues, electrical troubleshooting charts

Diagnostic Procedures:

On-Board Diagnostics (OBD-II) system usage, reading DTCs, data stream interpretation

Special Tools:

Identification and usage of specialized tools required for specific repairs

Technical Depth

Diagnostic Capability:

Advanced diagnostics including sensor data interpretation, ECU programming (if applicable/covered)

Repair Complexity:

Covers everything from routine maintenance to complete engine and transmission overhauls

Wiring Diagrams:

Detailed, section-specific electrical wiring diagrams

📊 Manual Specifications

File Format

File Type:

Searchability:

Searchable text for quick information retrieval

Compatibility:

Compatible with all PDF readers on PC, Mac, tablet, and smartphone.

Print Quality

Image Resolution:

High-resolution images and diagrams for clarity

Binding Type

Binding:

N/A (Digital Format)

Paper Type

Paper Quality:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Type:

EJ257 Flat-4 (Boxer)

Displacement:

2.5 Liters (2457 cc)

Aspiration:

Turbocharged and Intercooled

Performance

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 4000 rpm

Redline:

7000 rpm

Fuel System

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Compression Ratio:

8.4:1

🔧 Transmission

Standard

Transmission Type:

6-speed Manual Transmission (TY856)

Optional

Optional Transmission:

N/A (STI models exclusively featured manual transmission)

Features

Drivetrain:

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

Clutch Type:

Hydraulically actuated, multi-plate clutch

Differentials:

Front Helical Limited-Slip Differential (LSD), Rear Mechanical Limited-Slip Differential (LSD)

📐 Dimensions

Exterior

Length:

174.2 inches (Hatchback), 179.7 inches (Sedan)

Width:

70.9 inches

Height:

57.7 inches (Hatchback), 57.3 inches (Sedan)

Wheelbase:

103.0 inches

Weights

Curb Weight:

Approx. 3300-3350 lbs (depending on body style)

Gross Vehicle Weight Rating:

Approx. 4500 lbs

Cargo

Cargo Volume Hatchback:

Approx. 19.0 cu ft (rear seats up)

Cargo Volume Sedan:

Approx. 11.3 cu ft

🛡️ Safety Features

Ratings

NHTSA Front Crash Test:

5-star

NHTSA Side Crash Test:

5-star

IIHS Top Safety Pick:

Yes (for models with specific features)

Active Features

Traction Control:

Standard

Electronic Stability Control:

Standard (Vehicle Dynamics Control - VDC)

Antilock Braking System:

Standard (ABS)

Passive Features

Airbags:

Driver and front passenger airbags, front side-impact airbags, side-curtain airbags

Seat Belts:

3-point height-adjustable front seat belts with pre-tensioners and force limiters

💡 Technology Features

Infotainment

Audio System:

Standard AM/FM/CD with MP3 capability, SiriusXM Satellite Radio compatibility, auxiliary input. Optional navigation system.

Display:

Multi-function display in dashboard for climate control and audio information.

Driver Assistance

All Wheel Drive System:

Subaru's Symmetrical AWD with Driver Controlled Center Differential (DCCD) offering manual adjustment of torque split.

Performance Modes:

SI-DRIVE (Subaru Intelligent Drive) system offering three modes: Intelligent, Sport, and Sport Sharp.

Connectivity

Usb Port:

Auxiliary input standard, USB may vary by trim/options.

🔧 Maintenance

Service Intervals

Oil Change Interval:

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

Air Filter Replacement:

Every 15,000 miles or 12 months

Spark Plug Replacement:

Every 30,000 miles (specific iridium type)

Fluid Specifications

Engine Oil Type:

SAE 5W-30 Synthetic (API SN or ILSAC GF-5 certified)

Engine Oil Capacity:

Approx. 4.7 US quarts (with filter)

Coolant Type:

Subaru Super Coolant (Blue) or equivalent

Transmission Fluid Type:

Subaru ExtraS (or equivalent) for 6MT, or API GL-4 SAE 75W-90 Gear Oil

Brake Fluid Type:

DOT 3 or DOT 4 Brake Fluid

Known Issues

Head Gaskets:

While less prevalent on EJ257 than earlier EJ25s, it's a common concern for EJ engines. Manual will guide inspection.

Ringland Failure:

Can occur in high-mileage or heavily modified engines. Manual provides diagnostic paths.

Clutch Wear:

Performance driving can accelerate clutch wear. Manual details inspection and replacement.

📚 Vehicle History

Brand Heritage

Subaru Legacy:

Subaru's long history in motorsport, particularly WRC, cemented the Impreza's performance reputation.

Model Evolution

Third Generation Launch:

The 2008 model marked the beginning of the third generation (GR/GV), introducing a significant styling change with the hatchback model.

Sti Distinction:

The STI variant consistently represented the pinnacle of Impreza performance, featuring enhanced engines, suspensions, and drivetrains.

Production

Production Location:

Gunma Plant, Japan

🏆 Awards & Recognition

Recognitions

Car And Driver 10Best:

While not always specifically the STI, the Impreza WRX platform has been a frequent recipient of Car and Driver's 10Best lists.

Motorsport Achievements:

Subaru's extensive rally and racing success significantly contributes to the STI's desirability and technical development.