🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Year:

2007

Generation Code:

GD/GG (Third Generation)

Chassis Code:

GDB

👋 Introduction

Segment:

Performance Compact Sedan/Wagon

Competitors:

Mitsubishi Lancer Evolution, Honda Civic Si, Volkswagen GTI, Mazdaspeed3.

Brand Perception:

Known for its rally heritage, all-wheel-drive system, turbocharged performance, and driver engagement.

Drivetrain:

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

Engine:

2.5L turbocharged Boxer engine (EJ257).

Transmission:

6-speed manual transmission.

Brakes:

Brembo front and rear brake system.

Suspension:

Performance-tuned independent suspension.

📋 Manual Details

Manual Type:

Service Repair Manual

Language:

English

Format:

PDF Download

Page Count:

Approximately 3000+ pages (typical for comprehensive factory service manuals of this era)

📖 Manual Coverage

Engine Mechanical:

Detailed overhaul and repair procedures for EJ257 engine, including short block, cylinder heads, valvetrain, pistons, connecting rods, crankshaft, timing belt, oil pump, cooling system.

Engine Management:

ECU diagnosis, fuel injection system, ignition system, emissions control systems (EVAP, secondary air injection), sensor and actuator testing, wiring diagrams.

Transmission:

6-speed manual transmission (TY856WB1CA) overhaul, clutch system, gear selection mechanism, driveline components (driveshafts, differentials).

Suspension:

Front and rear suspension systems, struts, springs, control arms, sway bars, bushings, wheel alignment procedures.

Brakes:

Front and rear brake systems (Brembo calipers standard on STI), ABS, EBD, brake rotor/pad replacement, caliper overhaul, brake fluid bleeding.

Steering:

Power steering system, steering rack, steering column, alignment.

Electrical:

Complete electrical system, battery, charging system, starter, lighting, power windows, locks, mirrors, audio system, SRS airbag system, body control modules, comprehensive wiring diagrams.

Body:

Body panel removal and installation, exterior trim, doors, hood, trunk, bumpers, interior trim, seats, HVAC system, diagnosis and repair of body electrical components.

HVAC:

Air conditioning system, heater, climate control, refrigerant handling, component testing and replacement.

Safety Systems:

Airbag system diagnosis and service, seat belt mechanisms.

Maintenance:

Scheduled maintenance procedures, fluid changes (engine oil, coolant, transmission fluid, brake fluid, differential fluid), filter replacements, spark plug replacement, belt inspection/replacement.

Diagnostics:

Troubleshooting guides based on symptoms, diagnostic trouble codes (DTCs), on-board diagnostics (OBD-II) interpretation, component testing procedures.

Repair:

Step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation for all major vehicle systems.

Overhaul:

Complete engine and transmission overhaul procedures, including torque specifications, clearances, and critical assembly data.

Adjustment:

Clutch adjustment, parking brake adjustment, idle speed adjustment (if applicable), suspension alignment.

Calibration:

ECU relearn procedures, idle air control (IAC) valve relearn, throttle body relearn.

Depth:

Comprehensive. Covers everything from routine maintenance and diagnostics to complete engine and transmission rebuilds, detailed electrical schematics, and bodywork repair.

Target Audience:

Professional technicians and experienced DIY mechanics.

📊 Manual Specifications

Format:

PDF

Searchable:

Likely yes, if properly indexed

Printable:

Yes

Quality:

High resolution scans, typically mirroring factory publications.

Binding:

N/A (Digital PDF)

Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Engine Code:

EJ257

Engine Type:

Horizontally-opposed (Boxer), turbocharged, intercooled, DOHC, 16-valve.

Displacement:

2.5 Liters (2457 cc)

Horsepower:

305 hp @ 6000 rpm (JDM/Euro), 293 hp @ 6000 rpm (USDM)

Torque:

290 lb-ft @ 4000 rpm (JDM/Euro), 287 lb-ft @ 4000 rpm (USDM)

Fuel Delivery:

Multi-point fuel injection (MPI), sequential.

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Turbocharger:

IHI VF39 (USDM), VF36 (JDM/Euro)

Intercooler:

Top-mount, air-to-air.

🔧 Transmission

Type:

6-speed Manual (TY856WB1CA)

Type:

N/A (STI models were exclusively manual)

Dccd:

Driver Controlled Center Differential (electronic and manual modes).

Differentials:

Front: Helical limited-slip differential. Rear: Viscous coupling limited-slip differential.

📐 Dimensions

Length:

174.7 inches (4435 mm)

Width:

69.7 inches (1770 mm)

Height:

57.7 inches (1465 mm)

Wheelbase:

104.9 inches (2665 mm)

Track Width Front:

59.1 inches (1500 mm)

Track Width Rear:

59.3 inches (1505 mm)

Ground Clearance:

5.5 inches (140 mm)

Wheel Bolt Pattern:

5x114.3 mm (5x4.5 inches)

Wheel Size:

17 x 8.0 inches (standard), 18 x 8.5 inches (optional/STI)

Tire Size:

225/45R17 (standard), 235/40R18 (STI)

Curb Weight:

Approximately 3200-3300 lbs (1450-1500 kg)

Gross Vehicle Weight Rating:

Not specified, but typically around 4300 lbs.

🛡️ Safety Features

NHTSA Front Crash Test:

5-Star (2007 Impreza Sedan)

NHTSA Side Crash Test:

5-Star (2007 Impreza Sedan)

IIHS Front Crash Test:

Good (2007 Impreza Sedan)

IIHS Side Crash Test:

Good (2007 Impreza Sedan)

ABS:

Standard, 4-wheel Anti-lock Braking System.

Ebd:

Standard, Electronic Brake-force Distribution.

Traction Control:

Standard, with DCCD and AWD system integration.

Airbags:

Front dual-stage airbags, front side-impact airbags, side-curtain airbags (sedan).

Seatbelts:

3-point height-adjustable front seatbelts with pre-tensioners, 3-point rear seatbelts.

Child Anchors:

LATCH (Lower Anchors and Tethers for Children) system.

💡 Technology Features

Head Unit:

Factory AM/FM/CD player with optional subwoofer and amplifier.

Display:

Minimal dashboard display for audio, clock, and basic vehicle information.

Cruise Control:

Standard.

Limited Slip Differentials:

Advanced mechanical and electronic LSDs (DCCD, front helical, rear viscous) are key technological features for traction and handling.

Bluetooth:

N/A (Not available on this model year).

Usb Ports:

N/A (Not available on this model year).

🔧 Maintenance

Engine Oil Change:

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

Engine Oil Filter:

Replace with every oil change.

Air Filter:

Inspect every 15,000 miles, replace as needed or every 30,000 miles.

Cabin Air Filter:

Inspect every 15,000 miles, replace as needed or every 30,000 miles.

Spark Plugs:

Iridium type, replace every 60,000 miles.

Timing Belt:

Replace every 60,000 miles or 5 years (critical item for EJ engines).

Coolant Flush:

Every 30,000 miles or 3 years (using Subaru Super Coolant or equivalent).

Transmission Fluid:

Every 30,000-45,000 miles (manual transmission).

Differential Fluid Front Rear:

Every 30,000-45,000 miles.

Brake Fluid:

Every 30,000 miles or 2 years.

Engine Oil:

SAE 0W-30 (Synthetic recommended for performance applications), API SG, SH, SJ, SL, or SM certified.

Engine Oil Capacity:

5.5 US quarts (5.2 liters) with filter.

Coolant:

Subaru Super Coolant (Blue) or equivalent long-life silicate-free coolant.

Transmission Fluid:

API GL-5, SAE 75W-90 (synthetic recommended).

Differential Fluid Front Rear:

API GL-5, SAE 75W-90 (synthetic recommended).

Brake Fluid:

DOT 3 or DOT 4.

Engine:

Head gasket failures (less common on EJ257 compared to EJ253, but still possible), ringland failure under aggressive tuning/abuse, turbocharger wear (VF39/VF36), piston slap at cold start.

Transmission:

Clutch wear, synchro wear on certain gears (especially 2nd and 5th/6th) with hard use, differential wear with aggressive driving.

Suspension:

Bushing wear, premature shock absorber failure under aggressive driving, wheel bearing failure.

Electrical:

Alternator failure, MAF sensor issues, occasional ECU glitches.

📚 Vehicle History

Rally Roots:

Subaru's extensive involvement and success in the World Rally Championship (WRC) heavily influenced the development and marketing of the WRX STI models.

Third Gen Introduction:

The third generation (GD/GG) Impreza was introduced globally in late 2002, with the WRX STI variant evolving from previous generations. The 2007 model represents a significant iteration of this performance platform.

Specific Updates 2007:

The 2007 model year saw minor updates, including potentially revised ECU tuning and cosmetic tweaks compared to earlier GD chassis models. The EJ257 engine remained the core of the STI's performance.

Manufacturing Plant:

Mainly produced in Japan.

🏆 Awards & Recognition

Car And Driver 10Best:

Subaru Impreza WRX (non-STI) was a repeat winner of Car and Driver's 10Best list in various years prior to and around this era, highlighting the Impreza platform's overall quality.

Sport Compact Performance:

Consistently praised by automotive journalists for its performance credentials, handling dynamics, and rally-inspired driving experience.