Market Segment:
Performance Compact Sedan/Wagon (Gravel Rally Homologation Special)
Key Competitors:
Mitsubishi Lancer Evolution, Subaru WRX (non-STI), Mitsubishi Lancer Ralliart, Ford Focus SVT, Volkswagen GTI.
Performance Focus:
Engineered for rally performance, featuring a powerful turbocharged engine, advanced All-Wheel Drive system, and robust chassis.
Rally Heritage:
Direct lineage from Subaru's World Rally Championship (WRC) success, offering an authentic rally-bred driving experience.
Driver Engagement:
Emphasis on driver control and feedback, with a responsive steering system and well-tuned suspension.
Engine Mechanical:
Complete engine overhaul, disassembly, assembly, cylinder head, piston, crankshaft, connecting rod, camshaft, timing belt/chain, lubrication system, cooling system.
Engine Performance:
Fuel injection system, ignition system, turbocharger system, emission control systems (EVAP, EGR), engine diagnostics, ECU mapping.
Transmission Drivetrain:
Manual Transmission (TY757), All-Wheel Drive (AWD) system, differentials (front, center, rear), driveshafts, clutch system, torque specifications.
Suspension Steering:
Front and rear suspension (MacPherson struts front, multi-link rear), anti-roll bars, bushings, steering rack, power steering system, wheel alignment specifications.
Brakes:
Front Brembo 4-piston calipers, rear 2-piston calipers, ABS system, brake fluid specifications, bleeding procedures, parking brake.
Electrical System:
Battery, charging system (alternator), starting system, lighting (headlights, taillights, interior), horn, wipers, power windows, power locks, fuses, relays, wiring diagrams.
Body Interior:
Body panels, doors, windows, mirrors, seats, dashboard, HVAC system, interior trim, sound deadening, exterior trim, spoilers, body kits.
Diagnostic Troubleshooting:
Diagnostic trouble codes (DTCs), fault finding procedures, symptom-based troubleshooting, wiring harness testing.
Routine Maintenance:
Oil changes, filter replacements, spark plug replacement, fluid level checks, tire rotation, brake pad replacement, air filter replacement.
Major Repairs:
Engine rebuilds, transmission rebuilds, clutch replacement, turbocharger replacement, suspension component replacement, brake caliper overhaul.
Diagnostics:
Step-by-step diagnostic procedures for all major systems, including electrical, fuel, ignition, and emission controls.
Electrical Repair:
Component testing, wiring harness repair, sensor diagnosis, ECU diagnosis, using multimeter and oscilloscope.
Troubleshooting Guides:
Detailed guides to diagnose and resolve common and uncommon vehicle issues.
Depth Of Coverage:
Comprehensive. Covers everything from basic maintenance to complete engine and transmission rebuilds, including detailed specifications and diagnostic procedures.
Engine Type Sti:
2.5L DOHC Turbocharged Boxer 4-Cylinder (EJ257)
Engine Type Wrx:
2.0L DOHC Turbocharged Boxer 4-Cylinder (EJ205 - North America)
Horsepower Sti:
300 hp @ 6000 rpm (approx.)
Torque Sti:
300 lb-ft @ 4000 rpm (approx.)
Horsepower Wrx:
227 hp @ 5600 rpm (approx. for EJ205)
Torque Wrx:
217 lb-ft @ 4000 rpm (approx. for EJ205)
Fuel Delivery:
Multi-point Fuel Injection (MPI)
Fuel Type:
Premium Unleaded Gasoline (91 Octane or higher recommended)
ECU Type:
Engine Control Unit (ECU) with specific tuning for STI performance
NHTSA Front Impact:
5-Star (for driver and passenger)
NHTSA Side Impact:
4-Star (for front and rear passengers)
ABS:
Standard Anti-lock Braking System (ABS) with Electronic Brakeforce Distribution (EBD)
AWD:
Subaru Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) on STI
Airbags:
Driver and passenger front airbags, front side-impact airbags.
Seatbelts:
Three-point seatbelts with pretensioners and load limiters.
Chassis Design:
Reinforced chassis with crumple zones for improved impact energy absorption.
Oil Change Interval:
Every 3,000-5,000 miles or 3-6 months, especially under spirited driving conditions. Consult manual for specific recommendations.
Timing Belt Replacement:
Every 60,000-100,000 miles or 5-7 years (for EJ257 and EJ205 engines with timing belts). Crucial interval to prevent catastrophic engine failure.
Spark Plug Replacement:
Typically every 30,000-60,000 miles, depending on plug type (Iridium recommended).
Engine Oil Spec:
SAE 0W-30 or 5W-30 synthetic engine oil meeting API SN or ACEA A3/B4 standards. Consult manual for exact specification.
Coolant Spec:
Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant with a 50/50 mix of coolant and distilled water.
Brake Fluid Spec:
DOT 3 or DOT 4 brake fluid.
Ring Land Failure:
Common issue on EJ257 engines, particularly with aggressive tuning or improper maintenance, leading to piston ring land failure. Manual provides insights into proper engine care.
Clutch Wear:
High-performance clutch can wear faster with aggressive driving. Manual details clutch inspection and replacement procedures.
Differential Noise:
Occasional reports of differential noise, often related to fluid condition or wear. Manual covers differential maintenance and troubleshooting.
