🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Model Generation:

GD/GG (Second Generation)

Applicable Model Years:

2001, 2002

Chassis Code:

GDB (STI variant)

👋 Introduction

Vehicle Segment:

Compact Sports Sedan / Rally Homologation Special

Target Audience:

Enthusiasts, performance drivers, rally fans, DIY mechanics, professional technicians specializing in performance Subarus.

Key Competitors:

Mitsubishi Lancer Evolution (Evo) VII/VIII, Ford Focus RS Mk1, Honda Civic Type R (EP3), Toyota Celica GT-Four.

Performance Focus:

Iconic EJ207 engine with twin-scroll turbocharger, Subaru's signature Symmetrical All-Wheel Drive (SAWD) system, advanced Driver Controlled Center Differential (DCCD), stiffened chassis for rally performance.

Rally Heritage:

Direct lineage to Subaru's WRC championship-winning cars, known for exceptional handling, grip, and driver feedback.

📋 Manual Details

Manual Type:

Service and Repair Manual

Language:

English

Format:

Digital (likely PDF, but confirm with seller)

Page Count:

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

📖 Manual Coverage

Engine:

EJ207 (2.0L DOHC Turbocharged Boxer Engine) - including diagnostics, disassembly, assembly, and tuning specifics for the STI variant.

Transmission:

6-speed manual transmission (TY757) - clutch, gearbox, differentials, driveline components.

Suspension:

Front: MacPherson strut with lower wishbone, Rear: Multi-link independent - including alignment specifications, shock absorber replacement, bushing services.

Brakes:

Front: Ventilated discs with 4-piston Brembo calipers, Rear: Ventilated discs with 2-piston calipers - including ABS system, brake fluid flush, pad and rotor replacement.

Electrical System:

Full wiring diagrams, ECU pinouts, charging system, starting system, lighting, interior electronics, immobilizer system, power windows, central locking.

Fuel System:

Fuel injection, fuel pump, injectors, fuel filter replacement, fuel tank servicing.

Cooling System:

Radiator, coolant hoses, water pump, thermostat, fan control.

Exhaust System:

Catalytic converter, mufflers, exhaust manifold, turbocharger exhaust housing.

Steering System:

Power steering system, steering column, tie rods, wheel alignment.

Body And Chassis:

Body panel removal and installation, structural components, interior trim, glass replacement, weather stripping.

HVAC:

Air conditioning system servicing, heater core, blower motor, climate control unit.

Maintenance:

Oil changes, filter replacements (oil, air, fuel, cabin), spark plug replacement, coolant flush, brake fluid flush, transmission fluid change, differential fluid change, timing belt inspection/replacement (if applicable to EJ207 variant), belt tensioner service.

Troubleshooting:

Diagnostic trouble codes (DTCs), engine performance issues, electrical faults, transmission problems, brake system malfunctions, HVAC issues, common Subaru specific diagnostics.

Repair:

Engine rebuild procedures (detailed torque specs, component clearances), turbocharger overhaul, transmission overhaul, brake caliper rebuild, suspension component replacement, bodywork repair, electrical component repair/replacement.

Installation:

Component installation procedures for major systems, accessory installation guides.

Diagnostic Capabilities:

Advanced diagnostic procedures utilizing Subaru's Select Monitor (or equivalent OBD-II tools for the era), sensor data interpretation, live data analysis.

Engine Rebuild Detail:

Detailed specifications for piston ring gap, bearing clearances, cylinder bore honing, valve seat grinding, camshaft timing, torque sequences for cylinder heads and main bearings.

Transmission Rebuild Detail:

Gearbox component tolerances, synchro ring inspection, bearing pre-load adjustment, shift fork alignment, clutch assembly specifications.

Electrical Schematics:

Comprehensive, color-coded wiring diagrams for all circuits, allowing for precise tracing of electrical faults.

Special Tools:

Identification and usage instructions for specialized Subaru tools required for specific repairs (e.g., spring compressors, bearing pullers, seal installers).

📊 Manual Specifications

Digital Format:

Likely PDF; searchable text is highly desirable for efficient information retrieval.

Image Resolution:

High-resolution images and diagrams for clarity; essential for visual guides.

Physical Binding:

If printed: Spiral-bound or perfect-bound for lay-flat usability in a workshop environment.

Physical Paper:

If printed: Durable, possibly laminated pages to withstand grease and workshop conditions.

⚙️ Engine Specifications

Engine Code:

EJ207

Engine Type:

2.0L (1994cc) DOHC 16-valve turbocharged boxer-four

Bore X Stroke:

92.0 mm x 75.0 mm

Compression Ratio:

8.0:1 (typical for EJ207 STI variants for higher boost tolerance)

Horsepower:

Approx. 265-280 PS (195-206 kW) at 6000 rpm (JDM/European spec - US market often saw less powerful WRX models without STI badging)

Torque:

Approx. 343-370 Nm (253-273 lb-ft) at 4000 rpm (JDM/European spec)

Redline:

Approx. 8000 rpm (depending on specific ECU tune and model variation)

Fuel Delivery:

Multi-point sequential electronic fuel injection (MPI)

Turbocharger:

IHI VF30 or VF34 (twin-scroll, ball-bearing, intercooled)

Fuel Type:

Premium Unleaded (91 octane or higher recommended)

🔧 Transmission

Transmission Type:

6-speed manual transmission

Transmission Code:

TY757

All Wheel Drive System:

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

Front Differential:

Helical Limited Slip Differential (LSD)

Rear Differential:

Viscous Limited Slip Differential (VLSD)

Transmission Fluid Type:

API GL-5, SAE 75W-90 synthetic gear oil (Subaru Extra-S or equivalent)

Transmission Fluid Capacity:

Approx. 3.2-3.5 Liters

📐 Dimensions

Length:

Approx. 4,405 mm (173.4 in)

Width:

Approx. 1,770 mm (69.7 in)

Height:

Approx. 1,440 mm (56.7 in)

Wheelbase:

Approx. 2,530 mm (99.6 in)

Track Width Front:

Approx. 1,515 mm (59.6 in)

Track Width Rear:

Approx. 1,505 mm (59.3 in)

Curb Weight:

Approx. 1,440 kg (3,175 lbs)

Gross Vehicle Weight Rating:

Not readily available, but typically around 1900 kg.

Trunk Volume:

Approx. 0.305 m³ (10.8 cu ft)

🛡️ Safety Features

NHTSA Front Crash Test:

5 Stars (for 2001-2003 models)

IIHS Front Offset:

Good

ABS:

Standard 4-wheel Anti-lock Braking System (ABS)

Traction Control:

Subaru's Traction Control System (TCS) and Vehicle Dynamics Control (VDC) may be available on specific trims or options.

Airbags:

Front dual-stage airbags, optional side airbags.

Seatbelts:

Three-point front and rear seatbelts with pre-tensioners and load limiters.

Body Structure:

Reinforced safety cell with front and rear crumple zones.

💡 Technology Features

Audio System:

Factory AM/FM/CD player, likely with 4 or 6 speakers. Aftermarket head unit installation is common.

AWD Control:

Advanced Symmetrical All-Wheel Drive (SAWD) with Driver Controlled Center Differential (DCCD) for adjustable torque distribution.

ABS And Traction:

Integrated ABS and Traction Control (TCS/VDC) for enhanced stability and braking performance.

Factory Connectivity:

Limited to basic audio inputs (e.g., CD changer port). No Bluetooth or USB connectivity natively.

🔧 Maintenance

Engine Oil Change:

Every 7,500 miles (12,000 km) or 6 months, whichever comes first (severe use may require shorter intervals).

Oil Filter Replacement:

With every oil change.

Air Filter Replacement:

Every 15,000 miles (24,000 km) or 12 months.

Cabin Air Filter Replacement:

Every 15,000 miles (24,000 km) or 12 months (if equipped).

Spark Plug Replacement:

Iridium-tipped plugs: 60,000-100,000 miles (100,000-160,000 km) (check manual for exact type and interval).

Transmission Fluid Change:

Every 30,000 miles (48,000 km) or 24 months.

Differential Fluid Change:

Every 30,000 miles (48,000 km) or 24 months.

Coolant Replacement:

Every 30,000 miles (48,000 km) or 24 months.

Engine Oil Specification:

API SG or SH, ILSAC GF-II or GF-III, SAE 10W-30 or 10W-40 (check manual for exact viscosity and API rating recommendations for performance engines).

Engine Oil Capacity:

Approx. 4.5 Liters (with filter)

Brake Fluid Specification:

DOT 3 or DOT 4, low viscosity (LV) recommended for ABS systems.

Power Steering Fluid:

Subaru Genuine Power Steering Fluid or equivalent ATF Dexron II/III.

Engine Reliability:

Potential for piston ring land failure (ringland failure) if subjected to excessive detonation or aggressive tuning without proper supporting modifications. Head gasket leaks can also occur on higher mileage examples.

Turbocharger Wear:

Turbocharger failure can occur due to poor maintenance (infrequent oil changes) or oil starvation. Ball-bearing turbos are generally more robust but require proper cool-down periods.

Suspension Components:

Wear on suspension bushings, ball joints, and wheel bearings is common on performance cars driven hard.

Clutch Wear:

Clutch wear is dependent on driving style; aggressive launches and spirited driving will reduce clutch life.

📚 Vehicle History

Subaru Motorsport Legacy:

Subaru's extensive history in rallying, including multiple WRC manufacturer and driver championships, forms the bedrock of the Impreza WRX STI's performance reputation.

Gd Gg Generation:

This generation (introduced in late 2000 for the 2001 model year) saw significant chassis stiffening, improved aerodynamics, and the debut of the 6-speed transmission and DCCD system on STI models.

Sti Development:

STI (Subaru Technica International) variants represent the pinnacle of Impreza performance, featuring unique engine tuning, suspension geometry, braking systems, and aerodynamic enhancements compared to standard WRX models.

Production Period:

2000-2007 (for GD/GG generation, with 2001-2002 being early models of this platform)

Manufacturing Location:

Japan

🏆 Awards & Recognition

Rally Performance:

Consistently praised by automotive journalists and enthusiasts for its exceptional handling, all-wheel-drive capability, and rally-bred performance.

Enthusiast Rankings:

Often featured in 'best affordable sports cars' or 'greatest rally homologation specials' lists due to its driving dynamics and iconic status.