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Subaru Impreza (STI) Service & Repair Manual 2008

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🏷️ Basic Information Identification Make: Subaru Model: Impreza (STI) Year: 2008 Generation Generation Code: Third Generation (GE/GH/GR/GV) Generation Years: 2007-2011 (Global) Codes Chassis Codes: GH (Hatchback), GE (Sedan), GR (Hatchback...
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Subaru Impreza (STI) Service & Repair Manual 2008
🏷️ Basic Information
Identification
Make:
Subaru
Model:
Impreza (STI)
Year:
2008
Generation
Generation Code:
Third Generation (GE/GH/GR/GV)
Generation Years:
2007-2011 (Global)
Codes
Chassis Codes:
GH (Hatchback), GE (Sedan), GR (Hatchback STI), GV (Sedan STI)
👋 Introduction
Market Position
Market Position:
The Subaru Impreza STI (Subaru Tecnica International) is a high-performance, rally-bred compact sports sedan/hatchback known for its all-wheel-drive capabilities and turbocharged engine. It occupies a niche market segment for enthusiasts seeking a potent and engaging driving experience.
Competitive Analysis
Key Competitors:
Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS (in later generations), Mazdaspeed3.
Key Features
Key Features Of Vehicle:
Symmetrical All-Wheel Drive, turbocharged Boxer engine, performance-tuned suspension, aggressive styling, driver-focused interior.
📋 Manual Details
Coverage Areas
Styles Covered:
All styles covered (Sedan, Hatchback)
Page Count
Page Count:
100+
Manual Type
Manual Type:
Service & Repair Manual
Language
Language:
English
Format
Format:
Digital (Implied by description)
📖 Manual Coverage
Systems Covered
Engine Systems:
Engine mechanical, lubrication, cooling, fuel injection, ignition, exhaust, emissions control, turbocharger system
Drivetrain Systems:
Manual transmission (TY75/TY85 series), all-wheel-drive system (DCCD), differentials (front, center, rear), clutch system
Chassis Systems:
Suspension (front struts, rear multi-link), steering system (power steering), braking system (ABS, EBD, brake calipers, rotors), wheel alignment
Electrical Systems:
Wiring diagrams, starting system, charging system, lighting, instruments, power accessories, fuse/relay locations, ECU diagnostics
Body And Interior:
Body panels, doors, windows, seats, HVAC system, interior trim, safety restraint system (airbags)
Procedures Included
Maintenance Procedures:
Oil changes, filter replacements, spark plug replacement, air filter replacement, coolant flush, brake fluid service, differential fluid change
Repair Procedures:
Engine rebuild, transmission overhaul, brake caliper replacement, suspension component replacement, turbocharger service, clutch replacement, electrical component diagnosis and replacement
Troubleshooting Guides:
Diagnostic trouble codes (DTCs), symptom-based troubleshooting, common failure analysis
Technical Depth
Technical Depth:
Comprehensive, covering routine maintenance, diagnostics, and complete mechanical and electrical repairs. Includes detailed component removal and installation procedures.
📊 Manual Specifications
File Format
File Format:
Likely PDF, ensuring searchability and printability
Print Quality
Print Quality:
High-resolution, suitable for clear printing of diagrams and text
Binding Type
Binding Type:
N/A (Digital format)
Paper Type
Paper Type:
N/A (Digital format)
⚙️ Engine Specifications
Primary Engine
Engine Code:
EJ257
Engine Type:
2.5L Flat-Four (Horizontally Opposed) Turbocharged DOHC
Performance
Horsepower:
305 bhp @ 6000 rpm
Torque:
290 lb-ft @ 3500 rpm
Fuel System
Fuel Induction:
Sequential multi-port fuel injection (MPI) with Subaru's AVCS (Active Valve Control System)
Turbocharger:
IHI VF48 Twin-Scroll Turbocharger with intercooler
Other
Bore X Stroke:
99.5 mm x 79.0 mm
Compression Ratio:
8.2:1
Firing Order:
1-3-2-4
Engine Oil Capacity:
4.8 US Quarts (with filter)
Recommended Oil Viscosity:
SAE 5W-30 (Full Synthetic)
🔧 Transmission
Standard
Transmission Type:
6-Speed Manual (TY85)
Optional
Optional Transmission:
None for STI model
Features
All Wheel Drive System:
Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD)
Center Differential Modes:
Automatic Mode, Manual Lock Mode (with 6 settings)
Fluid Specs
Manual Transmission Fluid Spec:
API GL-5, SAE 75W-90 (Subaru Extra-S or equivalent)
Rear Differential Fluid Spec:
API GL-5, SAE 75W-90 (Subaru Extra-S or equivalent)
📐 Dimensions
Exterior
Wheelbase:
103.2 inches (2620 mm)
Length:
173.8 inches (4415 mm) (Sedan) / 174.0 inches (4420 mm) (Hatchback)
Width:
70.1 inches (1780 mm)
Height:
57.7 inches (1465 mm) (Sedan) / 58.1 inches (1475 mm) (Hatchback)
Weights
Curb Weight:
Approx. 3373 lbs (1530 kg) (Sedan) / 3395 lbs (1540 kg) (Hatchback)
Gross Vehicle Weight Rating:
Approx. 4300 lbs (1950 kg)
Cargo
Trunk Volume:
Approx. 11.6 cu ft (328 L) (Sedan) / 19.0 cu ft (538 L) with seats up (Hatchback)
Wheels Tires
Wheelbase Bolt Pattern:
5x114.3 mm (5x4.5 inches)
Standard Wheel Size:
18 x 8.5 inches
Standard Tire Size:
245/40R18
🛡️ Safety Features
Ratings
NHTSA Front Crash Test Rating:
5 Stars (for comparable models in this generation)
IIHS Moderate Overlap Front Rating:
Good (for comparable models in this generation)
Active Features
Active Safety Features:
Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Traction Control System (TCS), Vehicle Stability Control (VSC) with Sport Mode, Brembo performance brakes (front and rear)
Passive Features
Passive Safety Features:
Front dual-stage airbags, front side-impact airbags, curtain airbags (front and rear), front seatbelt pretensioners, crumple zones, high-strength steel body structure
💡 Technology Features
Infotainment
Infotainment System:
Standard Subaru CD player with MP3 capability, AM/FM tuner, and auxiliary input jack. Optional dealer-installed upgrades or aftermarket head units were common.
Speaker System:
Typically 6-speaker system. Higher trims might have premium audio options.
Driver Assistance
Driver Assistance Features:
ABS, EBD, TCS, VSC. No advanced driver-assistance systems (ADAS) like adaptive cruise control or lane-keeping assist were standard on this model.
Connectivity
Connectivity Features:
Auxiliary audio input. Bluetooth connectivity was an optional dealer-installed accessory or found in aftermarket head units.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Every 3,750 miles or 3.75 months (severe conditions), or 7,500 miles or 7.5 months (normal conditions), but often recommended more frequently for STI models due to performance driving.
Engine Air Filter:
Inspect every 7,500 miles, replace as needed (often sooner with performance driving).
Cabin Air Filter:
Inspect every 7,500 miles, replace annually or as needed.
Spark Plugs:
Replace every 60,000 miles (iridium type).
Fluid Specifications
Coolant Type:
Subaru Super Coolant (Blue) or equivalent silicate-free, long-life antifreeze/coolant.
Brake Fluid Spec:
DOT 3 or DOT 4
Power Steering Fluid Spec:
Subaru Genuine Power Steering Fluid or Dexron III ATF
Known Issues
Common Issues:
Head gasket failures (though less common on EJ257 than previous EJ25 variants), ringland failure in cylinders 3 and 4 under high boost/poor tuning, clutch wear due to performance driving, turbocharger wear/failure, attention to DCCD system maintenance.
Maintenance Importance:
Due to its performance nature, strict adherence to maintenance schedules and using quality fluids is crucial to prevent premature component failure.
📚 Vehicle History
Brand Heritage
Brand Rally Heritage:
Subaru's rich history in World Rally Championship (WRC), achieving multiple manufacturer and driver championships, directly influencing the STI's development and performance DNA.
Model Evolution
Previous Generation Sti:
The 2008 STI represents the first generation of the Impreza STI to be officially sold in the United States, succeeding the more limited Subaru Impreza WRX STI (GD chassis) which was available in limited numbers previously.
Styling Change:
This generation (GE/GH/GR/GV) marked a significant departure from the previous 'bug-eye', 'blob-eye', and 'hawkeye' designs, adopting a more mainstream and less aggressive 'C-shaped' headlight design, though the STI retained its distinctive aerodynamic enhancements.
Production
Production Location:
Gunma Plant, Japan
🏆 Awards & Recognition
Recognitions
Performance Awards:
Consistently ranked highly by automotive publications for its performance, handling, and all-wheel-drive capabilities. Often featured in 'best performance car' lists within its price bracket.
Ratings
Driving Enthusiast Ratings:
Praised for driver engagement, steering feel, and the effectiveness of its AWD system, particularly in challenging conditions.
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