🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Model Code:

GR/GV (Third Generation)

Model Variant:

STI (Turbocharged)

Model Variant Non Turbo Mention:

Impreza (Non-Turbo) - indicated by manual title, likely covering standard Impreza models as well for comparison/shared components.

Chassis Code:

GR (Hatchback), GV (Sedan)

Engine Codes:

EJ257 (STI - Turbocharged), EJ20 (Non-Turbo variants)

👋 Introduction

Segment:

Performance Compact Sedan/Hatchback

Usp Sti:

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

Key Competitors 2007 2008:

Mitsubishi Lancer Evolution, Subaru WRX (non-STI), Mitsubishi Eclipse GT, Volkswagen GTI, Mazdaspeed3.

Performance Focus:

Designed for enthusiasts seeking high performance, handling, and driver engagement.

All Wheel Drive:

Subaru's signature Symmetrical AWD system, crucial for traction and handling.

Dccd:

Driver-Controlled Center Differential (STI models) allowing manual adjustment of front-to-rear torque split.

📋 Manual Details

Covered Model Years:

2007, 2008

Covered Regions:

Likely Global, with potential focus on markets where these models were prominent (e.g., North America, Europe, Japan).

Estimated Page Count:

Hundreds (as stated in description, typically 1000+ pages for comprehensive service manuals of this era).

Type:

Service and Repair Manual

Purpose:

Repair, Maintenance, Rebuild, Refurbish, Restoration

Language:

English (assumed based on product description language)

Format:

PDF

📖 Manual Coverage

Powertrain:

Engine (EJ257/EJ20), Turbocharger System, Intercooler, Fuel System, Exhaust System, Drivetrain (AWD system, DCCD, differentials, axles), Transmission (6-speed manual).

Chassis:

Suspension (Front: MacPherson strut, Rear: Double wishbone), Steering (Power assisted), Brakes (ABS, Ventilated discs front/rear, Brembo calipers on STI), Wheels and Tires.

Electrical:

Engine Control Unit (ECU), Ignition System, Lighting (Headlights, Taillights, Interior), Gauges and Instruments, Power Accessories (Windows, Locks, Mirrors), Audio System, Wiper and Washer System, Cruise Control.

Body And Interior:

Body Panels, Doors, Hood, Trunk/Tailgate, Bumpers, Seats, Dashboard, Trim Panels, HVAC System (Heating, Ventilation, Air Conditioning).

Routine Maintenance:

Oil and Filter Changes, Air Filter Replacement, Spark Plug Replacement, Coolant Flush, Brake Fluid Flush, Differential Fluid Changes, Transmission Fluid Changes.

Diagnostic Procedures:

Troubleshooting guides based on symptoms, DTC (Diagnostic Trouble Code) interpretation and resolution, Electrical circuit testing, Component testing.

Component Repair And Replacement:

Engine rebuild procedures (e.g., piston, rod, bearing replacement), Turbocharger overhaul, Clutch replacement, Brake caliper and rotor replacement, Suspension component replacement (shocks, struts, bushings), Radiator replacement, Alternator and starter replacement.

Bodywork And Collision Repair:

Panel alignment, Dent repair, Rust treatment, Glass replacement, Trim component repair/replacement.

Diagnostic Tools:

Use of Subaru Select Monitor (SSM) or compatible OBD-II scanners.

Torque Specifications:

Detailed torque values for all fasteners (engine, chassis, suspension, brakes).

Wiring Diagrams:

Comprehensive electrical schematics for all systems.

Service Bulletins:

Likely includes reference to or summarization of TSBs (Technical Service Bulletins) relevant to the covered years.

📊 Manual Specifications

Searchability:

Typically, PDF manuals are text-searchable, allowing quick access to specific terms and procedures.

Printability:

Generally printable, allowing for physical reference in a workshop environment.

Resolution:

High resolution, ensuring clarity of diagrams, schematics, and images.

Digital Format:

N/A (Digital PDF)

Digital Format:

N/A (Digital PDF)

⚙️ Engine Specifications

Model Sti:

EJ257

Configuration Sti:

2.5L (2457cc) DOHC turbocharged horizontally opposed (Boxer) 4-cylinder

Non Turbo Mention:

2.0L EJ20 variants likely for standard Impreza models covered.

Horsepower Sti:

305 hp @ 6000 rpm (SAE Net, North American Spec)

Torque Sti:

290 lb-ft @ 3500 rpm (SAE Net, North American Spec)

Injection Type Sti:

Multi-point fuel injection (MPI) with Electronic Fuel Injection (EFI), Top-feed fuel injectors.

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher recommended)

ECU Type:

Engine Control Unit (ECU) with advanced engine management for turbocharging and AWD.

🔧 Transmission

Type:

6-speed Manual Transmission (TY757)

Type:

None for STI models in this generation.

Dccd Integration:

Integrated with DCCD for driver-selectable front-to-rear torque bias.

Manual Transmission Fluid Sti:

Subaru Genuine Gear Oil API GL-5 75W-90 or equivalent.

Manual Transmission Capacity Sti:

Approx. 2.7 Liters (2.9 US Quarts)

📐 Dimensions

Length:

4,415 mm (173.8 in)

Length:

4,580 mm (180.3 in)

Width:

1,795 mm (70.7 in)

Height:

1,475 mm (58.1 in) (Hatchback), 1,440 mm (56.7 in) (Sedan)

Wheelbase:

2,650 mm (104.3 in)

Curb Weight Sti Hatchback:

Approx. 1,505 kg (3,318 lbs)

Curb Weight Sti Sedan:

Approx. 1,470 kg (3,241 lbs)

🛡️ Safety Features

NHTSA Front Impact Driver:

5-Star (for equivalent 2008 Impreza models)

NHTSA Front Impact Passenger:

5-Star (for equivalent 2008 Impreza models)

IIHS Front Offset Crash Rating:

Good (for equivalent 2008 Impreza models)

ABS:

Anti-lock Braking System (ABS) with EBD (Electronic Brake-force Distribution)

Traction Control:

Vehicle Dynamics Control (VDC) / Traction Control System (TCS)

AWD:

Symmetrical All-Wheel Drive enhances active safety.

Airbags:

Frontal airbags (driver and passenger), Side curtain airbags (front and rear), Front seat-mounted side-impact airbags.

Seatbelts:

Three-point height-adjustable front seatbelts with pretensioners and load limiters, Three-point rear seatbelts.

Child Seat Anchors:

LATCH (Lower Anchors and Tethers for CHildren) system.

💡 Technology Features

Audio System:

Factory AM/FM/CD audio system with optional subwoofer and amplifier. Bluetooth connectivity may be optional depending on trim.

Navigation:

Optional factory navigation system available on higher trims.

Cruise Control:

Standard cruise control system.

Keyless Entry:

Available keyless entry and ignition systems.

OBD Ii:

On-Board Diagnostics II (OBD-II) port for scanning and diagnostics.

🔧 Maintenance

Engine Oil And Filter:

Every 3,750 miles or 3 months (severe conditions), 7,500 miles or 6 months (normal conditions). Consult manual for exact schedule.

Engine Air Filter:

Inspect every 7,500 miles, Replace as needed or every 15,000-30,000 miles.

Spark Plugs:

Typically iridium plugs with longer intervals, around 60,000 - 105,000 miles, depending on specific plug and driving conditions. Consult manual for exact type and interval.

Drivetrain Fluids:

Rear Differential: 30,000 miles. Transmission: 30,000 - 60,000 miles. DCCD Fluid: 60,000 miles. Consult manual for exact intervals.

Engine Oil Type:

SAE 5W-30, API SN or higher, Synthetic recommended (e.g., Subaru Synthetic Engine Oil 5W-30).

Coolant Type:

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

Engine Oil Capacity:

Approx. 5.1 Liters (5.4 US Quarts) with filter change.

Ej257 Ringland Failure:

A known potential issue in higher-mileage or aggressively driven EJ257 engines, often exacerbated by poor tuning or detonation. The manual would cover inspection and potential repair strategies.

Clutch Wear:

Performance clutches can wear faster with aggressive driving. Manual details clutch inspection and replacement.

Turbo Maintenance:

Proper warm-up and cool-down procedures are critical. Manual will detail turbocharger lubrication and inspection.

📚 Vehicle History

Motorsport Roots:

Subaru's extensive history and success in World Rally Championship (WRC) directly influenced the Impreza STI's development and performance characteristics.

Generation Start:

Third Generation (GR/GV chassis) introduced for the 2008 model year, replacing the GDB chassis.

Design Changes 2008:

Introduction of the hatchback body style alongside a new sedan design, featuring a more aggressive and wider stance compared to previous generations.

Manufacturing Location:

Japan (primarily Gunma Plant)

🏆 Awards & Recognition

Performance Awards:

While specific awards for the 2007-2008 model year might vary, the Impreza STI consistently received praise from automotive journalists for its handling, performance, and value in the enthusiast segment.

Consumer Reports Reliability:

Ratings varied by year and specific issues, often falling average to below average due to performance-oriented components and complexity. Manual is crucial for proactive maintenance.