Segment:
Performance Compact Sedan/Hatchback
Usp:
All-wheel drive, turbocharged boxer engines, rally-inspired performance.
Competitors:
Mitsubishi Lancer Evolution, Volkswagen GTI, Mazdaspeed3, Honda Civic Si
Performance Focus:
Engineered for spirited driving and track-day capability.
Diy Support:
Specifically targets 'do-it-yourself' mechanics with clear instructions.
Powertrain:
Engine mechanical, Engine control (ECU), Fuel system, Ignition system, Exhaust system, Lubrication system, Cooling system, Turbocharger system
Drivetrain:
Transmission (manual, DCCD), Transfer case, Front differential, Rear differential, Driveshafts, Axles
Chassis:
Suspension (front/rear), Steering system, Brake system (ABS, EBD), Wheel bearings
Electrical:
Wiring diagrams, Lighting, Instrumentation, Power accessories, Engine management sensors, Body control modules, Audio system, Immobilizer
Body:
Exterior panels, Interior trim, Doors, Hood, Trunk, Glass, Seats, Safety restraints (SRS)
Maintenance:
Oil changes, Filter replacements, Fluid checks/changes, Spark plug replacement, Belt inspection/replacement, Brake pad/rotor replacement, Tire rotation
Repair:
Engine rebuilds, Turbocharger replacement, Transmission overhaul, Clutch replacement, Suspension component replacement, Brake caliper rebuild, Electrical component diagnosis and replacement
Diagnostics:
OBD-II diagnostic trouble codes (DTCs), Sensor testing, Actuator testing, Wiring continuity checks, Pressure testing (fuel, oil, coolant)
Depth:
Comprehensive factory-level detail, suitable for professional technicians and advanced DIY enthusiasts.
Documentation Style:
Step-by-step instructions with detailed illustrations and diagrams.
Engine Type:
2.5L DOHC Turbocharged Boxer (EJ255)
Horsepower Wrx:
224 hp @ 5600 rpm
Torque Wrx:
226 lb-ft @ 3600 rpm
Engine Type:
2.5L DOHC Turbocharged Boxer (EJ257, Semi-closed deck)
Horsepower Sti:
305 hp @ 6000 rpm
Torque Sti:
350 lb-ft @ 3600 rpm
Compression Ratio Wrx:
8.4:1
Compression Ratio Sti:
8.2:1
Fuel Delivery:
Sequential Multi-point Fuel Injection (MPI)
Fuel Type:
Premium Unleaded (91+ Octane Recommended)
Ignition System:
Electronic Ignition with Coil-on-Plug (COP) system
NHTSA Front Impact:
5-Star
NHTSA Side Impact:
5-Star
ABS:
Anti-lock Braking System
Ebd:
Electronic Brake-force Distribution
Traction Control:
Standard on WRX, Advanced (Active) on STI
Airbags:
Frontal, Side Curtain, Front Side-Impact
Seatbelts:
Pretensioners with Force Limiters
Oil Change Interval:
Every 3,750 miles or 3 months (severe duty), 7,500 miles or 6 months (normal duty).
Timing Belt Replacement:
105,000 miles (or as per manual inspection/recommendation).
Engine Oil:
SAE 0W-30 Synthetic (API SG, SH, SJ, SL, SM or ILSAC GF-2, GF-3)
Transmission Fluid Wrx:
SAE 75W-90 GL-5
Transmission Fluid Sti:
SAE 75W-90 GL-5 (consider higher-spec for performance)
Coolant:
Subaru Super Coolant (50/50 mix with distilled water)
Engine Ringland Failure:
Common on EJ257 engines under high stress/poor tuning. Manual covers engine assembly and specifications.
Clutch Wear:
High-performance nature can lead to faster clutch wear with aggressive driving. Manual details clutch inspection and replacement.
Turbocharger Failures:
Can occur due to oil starvation or contamination. Manual provides oil system diagnostics and turbo removal/installation.
