🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2015 Codes Chassis Code: GV/GRB (for hatchback, though 2015 is primarily VA generation sedan) Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan / Rally-Bred Sport Compact Reputation: Iconic performance model known for its rally heritage, all-wheel-drive system, and powerful turbocharged engine. Competitive Analysis Competitors: Mitsubishi Lancer Evolution (prior to discontinuation), Ford Focus RS, Volkswagen Golf R, Honda Civic Type R Key Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Engine Type: Turbocharged Boxer Engine Performance Focus: Designed for high-performance driving, handling, and track capability. Manual Value Purpose: Essential resource for owners and technicians performing maintenance, diagnostics, and repairs on the 2015 Subaru Impreza WRX STI. 📋 Manual Details Coverage Areas Systems: Engine, Transmission (Manual & Automatic - though STI is primarily manual), Drivetrain (AWD System, Differentials), Suspension, Steering, Brakes, Electrical System, HVAC, Body & Chassis, Emissions, Diagnostics, Troubleshooting, Specifications Page Count Estimated Pages: ~2000-3000 (typical for comprehensive factory service manuals) Manual Type Type: Factory Service Repair Workshop Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, cylinder head, block, crankshaft, pistons, connecting rods, lubrication system, cooling system, intake system, exhaust system, turbocharger system Fuel System: Fuel injectors, fuel pump, fuel lines, fuel pressure regulator, evaporative emission control (EVAP) Ignition System: Ignition coils, spark plugs, ignition timing Transmission Drivetrain: Manual transmission (6-speed TY85), clutch system, all-wheel-drive (AWD) system, center differential, front and rear differentials, driveshafts, wheel hubs Suspension Steering: Front and rear suspension components (struts, springs, control arms, sway bars), steering rack, power steering system Brake System: Front and rear brake calipers (Brembo), rotors, brake pads, master cylinder, brake lines, ABS system, electronic brake-force distribution (EBD), brake fluid specifications Electrical System: Battery, alternator, starter, lighting system, power windows, power locks, infotainment system, instrument cluster, wiring diagrams, fuses, relays, ECU/ECM diagnostics HVAC System: Air conditioning, heater core, blower motor, climate control unit Body Chassis: Body panels, doors, hood, trunk, interior trim, chassis components, corrosion protection Emissions Control: Catalytic converter, oxygen sensors, secondary air injection system Procedures Included Maintenance: Oil changes, filter replacements, spark plug replacement, coolant flushes, brake fluid service, transmission fluid service, differential fluid service, air filter replacement Diagnostics Troubleshooting: OBD-II diagnostic codes, symptom-based troubleshooting, component testing procedures, wiring diagram interpretation Repair Rebuild: Engine overhaul, transmission rebuild, suspension component replacement, brake caliper rebuild, steering rack replacement, clutch replacement, turbocharger replacement, ECU/ECM replacement Installation Adjustment: Timing belt/chain replacement, turbocharger installation, suspension alignment specifications, brake bleeding procedures, clutch pedal adjustment Technical Depth Depth: Comprehensive factory-level detail, including torque specifications, component tolerances, diagnostic trouble codes (DTCs), wiring schematics, and step-by-step repair instructions for all major systems. 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Searchable text for quick information retrieval Print Quality Quality: High-resolution, suitable for printing individual pages or the entire manual Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L DOHC 16-Valve Turbocharged Subaru BOXER Engine Displacement: 2457 cc (2.5 Liters) Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Sequential Multi-Port Fuel Injection (SMPI) with Side Feed Injectors Fuel Type: Premium Unleaded Gasoline (91 Octane or Higher Recommended) Compression Ratio Ratio: 8.2:1 Turbocharger Type: Twin-Scroll Turbocharger with Intercooler 🔧 Transmission Standard Type: 6-Speed Manual Transmission (TY85) Optional Type: N/A for WRX STI model (Manual transmission only) Features Drivetrain Coupling: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Fluid Type Manual Transmission Fluid: Subaru ExtraS synthetic gear oil (75W-90 GL-5) or equivalent Front Differential Fluid: Subaru ExtraS synthetic gear oil (75W-90 GL-5) or equivalent Rear Differential Fluid: Subaru ExtraS synthetic gear oil (75W-90 GL-5) or equivalent 📐 Dimensions Exterior Length: 180.0 inches (4572 mm) Width: 70.7 inches (1796 mm) Height: 58.1 inches (1476 mm) Wheelbase: 104.0 inches (2641 mm) Weights Curb Weight: Approximately 3,400 - 3,500 lbs (1542 - 1588 kg) Gross Vehicle Weight Rating: Not explicitly stated but typically around 4,500 lbs. 🛡️ Safety Features Ratings NHTSA Overall Rating: 5-Star Overall (NHTSA ratings vary by specific configuration and testing) Active Features Traction Control: Vehicle Dynamics Control (VDC) with SI-Drive Braking System: Four-wheel Anti-lock Braking System (ABS), Electronic Brake-force Distribution (EBD), Brake Assist Passive Features Airbags: Frontal, side-curtain, front seat-mounted side airbags, driver's knee airbag Body Structure: Advanced Ring-Shaped Reinforcement Frame 💡 Technology Features Infotainment Head Unit: Subaru Starlink infotainment system with 6.2-inch touchscreen, AM/FM/CD/MP3, SiriusXM Satellite Radio, USB port, auxiliary input, Bluetooth connectivity. Audio System: 6-speaker audio system (optional upgraded system available). Driver Assistance Performance Features: SI-Drive (Subaru Intelligent Drive) with Intelligent, Sport, and Sport Sharp modes; Multi-Mode Driver Controlled Center Differential (DCCD). Connectivity Bluetooth: Bluetooth hands-free phone connectivity and audio streaming. Instrumentation Gauges: Multi-information display...