Segment:
Performance Compact Sedan/Wagon
Target Audience:
Enthusiasts, DIY mechanics, professional technicians
Competitors:
Mitsubishi Lancer Evolution, Ford Focus RS (era)
All Wheel Drive:
Subaru's Symmetrical All-Wheel Drive System
Turbocharged Engine:
High-performance EJ207 Boxer Engine
Handling:
Renowned for exceptional grip and agility
Rally Heritage:
Direct lineage from Subaru's WRC success
Engine:
Complete Overhaul, Diagnostics, Tuning
Transmission:
Manual (6-speed), Clutch, Drivetrain
Suspension:
Front & Rear McPherson Struts, Anti-Roll Bars, Alignment
Brakes:
ABS, Front/Rear Discs, Brembo Calipers (STI)
Electrical:
Wiring Diagrams, ECU, Lighting, Sensors
Body And Chassis:
Frame, Panels, Doors, Exterior Trim
HVAC:
Air Conditioning, Heating, Ventilation
Fuel System:
Fuel Pump, Injectors, Lines, Tank
Cooling System:
Radiator, Water Pump, Thermostat
Exhaust System:
Catalytic Converter, Mufflers, Piping
Interior:
Seats, Dashboard, Trim Panels
Routine Maintenance:
Oil Changes, Filter Replacements, Spark Plugs
Troubleshooting:
Diagnostic Codes, Symptom Analysis, Component Testing
Engine Rebuild:
Top-End and Bottom-End Overhaul, Piston/Ring Replacement
Transmission Repair:
Gearbox Disassembly, Reassembly, Bearing Replacement
Brake Service:
Pad/Rotor Replacement, Caliper Service, Bleeding
Suspension Replacement:
Strut/Shock Absorber, Bushing, Ball Joint Replacement
Electrical Diagnostics:
Component Testing, Wiring Harness Repair
Turbocharger Service:
Inspection, Rebuild, Installation
Timing Belt Replacement:
Procedure for EJ207 Engine
Wheel Alignment:
Specifications and Adjustment Procedures
Depth:
Comprehensive: From basic maintenance to full engine and transmission rebuilds, including advanced diagnostics.
Engine Type:
EJ207 Flat-4 (Boxer), DOHC, 16 Valves, Turbocharged
Displacement:
2.0 Liters (1994 cc)
Bore X Stroke:
92.0 mm x 75.0 mm
Engine Management:
ECU controlled sequential fuel injection, distributorless ignition
Horsepower:
265-280 PS (195-206 kW) at 5600-6000 rpm (varies by market)
Torque:
253-272 lb-ft (343-369 Nm) at 4000-4400 rpm (varies by market)
Fuel Type:
Premium Unleaded (91+ octane recommended)
Fuel Delivery:
Multi-point Fuel Injection (MPI)
Turbocharger Spec:
IHI VF34 (or similar twin-scroll configuration)
Intercooler:
Air-to-Air Top Mount Intercooler
Transmission Type:
6-Speed Manual (TY757)
Optional Transmission:
N/A (STI models exclusively manual)
Differentials:
Driver Controlled Center Differential (DCCD), Helical front LSD, Helical rear LSD
Gear Ratios:
Refer to manual for specific ratios (typically close-ratio)
Clutch Type:
Hydraulically actuated multi-plate clutch
NHTSA Front Impact:
4-star (Driver), 4-star (Passenger)
NHTSA Side Impact:
5-star (Driver), 5-star (Rear Passenger)
IIHS Frontal Offset:
Good
ABS:
Standard Anti-lock Braking System
Traction Control:
Standard
Electronic Brake-Force Distribution:
Standard (EBD)
Airbags:
Driver and Passenger Front Airbags, Side Airbags
Seatbelts:
3-point front and rear seatbelts with pretensioners
Body Structure:
Reinforced chassis with crumple zones
Head Unit:
Factory AM/FM/CD player with optional premium sound system.
Display:
Basic LCD display for radio and clock.
Driver Assistance Systems:
Limited to ABS and Traction Control. No advanced driver-assistance systems (ADAS).
Connectivity Options:
No Bluetooth or USB connectivity in standard configuration.
Oil Change Interval:
Every 3,750 miles (6,000 km) or 6 months, whichever comes first (severe driving conditions recommended for performance vehicles)
Timing Belt Replacement Interval:
Every 105,000 miles (168,000 km) or 7 years
Spark Plug Replacement Interval:
Every 30,000 miles (48,000 km) for iridium-tipped plugs
Coolant Flush:
Every 30,000 miles (48,000 km) or 2 years
Engine Oil Type:
SAE 5W-30 Synthetic (API SG or SH, ACEA A2/B2)
Engine Oil Capacity:
4.5 Liters (4.8 US Quarts) with filter change
Coolant Type:
Subaru Super Coolant (Blue) or equivalent
Transmission Fluid Type:
SAE 75W-90 (API GL-5) Gear Oil (Front & Rear Differentials and Transmission)
Brake Fluid Type:
DOT 3 or DOT 4
Piston Ringland Failure:
Common in heavily modified or poorly maintained EJ207 engines, especially with aggressive tuning.
Clutch Wear:
Can wear prematurely with aggressive driving.
Suspension Bushings:
Can degrade over time, leading to creaks and handling issues.
Water Pump Leaks:
Common failure point, often replaced with timing belt service.
Oil Cooler Leaks:
Can develop leaks over time.
Brand Focus:
Symmetrical All-Wheel Drive and Boxer Engines
Motorsport Connection:
Extensive World Rally Championship (WRC) history and success
Generation:
Second Generation (GD) Impreza
Design Change From Previous:
Introduction of 'bug-eye' or 'blob-eye' headlights for 2003-2005 models, distinguishing it from the first generation.
Manufacturing Location:
Gunma, Japan
Production Period For Gd Sti:
2002-2007 (with facelifts)
