🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2015 Codes Chassis Code: GVB/GRB (Wagon/Hatchback based) Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Target Audience: Enthusiasts, Performance Drivers, DIY Mechanics, Professional Technicians Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf R, Ford Focus RS (though often categorized slightly differently due to AWD focus) Key Features Drivetrain: Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD) Engine: High-performance turbocharged boxer engine Suspension: STI-tuned performance suspension for superior handling Brakes: Performance Brembo braking system Rally Heritage: Direct lineage from Subaru's successful World Rally Championship (WRC) program 📋 Manual Details Coverage Areas Primary Coverage: Full Workshop Service and Repair Secondary Coverage: Diagnostics, Troubleshooting, Maintenance, Reassembly Page Count Estimated Pages: 2000+ Manual Type Type: Workshop Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Powertrain: Engine (EJ257), Turbocharger System, Exhaust System, Fuel System, Cooling System Drivetrain: All-Wheel Drive System (Symmetrical AWD), Differential Units (Front, Center DCCD, Rear), Driveshafts, Axles Transmission: 6-Speed Manual Transmission (TY856) Suspension: Front MacPherson Struts, Rear Double Wishbone, STI-specific Tuning, Springs, Dampers, Bushings Brakes: Front 6-Piston Brembo Calipers, Rear 2-Piston Brembo Calipers, ABS, EBD, Brake Fluid Specifications Steering: Power Assisted Rack and Pinion, Steering Column Components Electrical: Battery, Charging System, Ignition System, Lighting, Fuses, Relays, ECUs, Wiring Diagrams, CAN Bus System Body And Chassis: Body Panels, Doors, Hood, Trunk, Bumpers, Chassis Structure, Sound Deadening Interior: Seating, Dashboard, Trim Panels, Airbags, Seatbelts, HVAC System Diagnostics: OBD-II Procedures, DTC Codes, Scan Tool Usage, Sensor Testing Procedures Included Engine Repair: Engine Overhaul, Piston Ring Replacement, Valve Adjustment, Timing Belt/Chain Service, Turbocharger Rebuild/Replacement Transmission Repair: Clutch Replacement, Gearbox Rebuild, Differential Service, DCCD System Adjustment Brake Service: Brake Pad/Rotor Replacement, Caliper Overhaul, Bleeding Procedures, ABS Component Testing Suspension And Steering Repair: Strut Replacement, Bushing Replacement, Wheel Alignment Specifications, Power Steering System Service Electrical Diagnostics: Wiring Harness Repair, Sensor Troubleshooting, ECU Diagnosis, Component Testing Body And Interior Repair: Panel Replacement, Dent Repair, Trim Installation, Airbag System Diagnosis Routine Maintenance: Oil Changes, Filter Replacements, Spark Plug Service, Fluid Checks and Replenishment Troubleshooting: System-specific diagnostic flowcharts and fault isolation procedures Technical Depth Depth: Comprehensive: From basic maintenance to complete engine and transmission rebuilds, including detailed diagnostic procedures and specifications. Diagnostic Capabilities: Advanced, including ECU learning/reset procedures, sensor data interpretation, and detailed electrical system troubleshooting. Rebuild Procedures: Detailed steps for major component overhauls, including torque specifications, clearances, and assembly sequences. 📊 Manual Specifications File Format Type: PDF Searchability: Searchable text content for quick information retrieval. Digital Rights: Instant Download, Accessible on Multiple Devices Print Quality Resolution: High resolution, suitable for printing individual pages or sections. Binding Type Type: N/A (Digital Download) Paper Type Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally Opposed (Boxer) 4-Cylinder, Turbocharged, Intercooled Displacement: 2.5 Liters (2457 cc) Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.4:1 Valve Train: DOHC, 4 Valves per Cylinder, Variable Valve Lift and Timing (AVCS) Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft (393 Nm) @ 4000 rpm Fuel System Induction: Multi-Point Fuel Injection (MPI) with Turbocharging Fuel Type: Premium Unleaded Gasoline (91 Octane or higher recommended) Fuel Pump: High-flow, in-tank electric fuel pump Fluid Specifications Engine Oil Capacity: 5.0 US quarts (4.7 Liters) with filter change Engine Oil Type: SAE 5W-30 Synthetic (per Subaru specification) Coolant Type: Subaru Super Coolant (Blue) or equivalent HOAT coolant 🔧 Transmission Standard Type: 6-Speed Manual Transmission Model Code: TY856 (specific variant) Features Dccd: Driver Controlled Center Differential (manual operation with auto modes) Differentials: Front Helical Limited-Slip Differential (LSD), Rear Torsen Limited-Slip Differential (LSD) Fluid Specifications Transmission Fluid Type: API GL-5, SAE 75W-90 Synthetic Gear Oil (check specific service bulletin for exact specs) Transmission Oil Capacity: Approx. 3.3 US quarts (3.1 Liters) 📐 Dimensions Exterior Wheelbase: 104.1 inches (2645 mm) Length: 173.4 inches (4405 mm) Width: 70.1 inches (1780 mm) Height: 58.1 inches (1475 mm) Ground Clearance: 5.0 inches (127 mm) Weights Curb Weight: Approx. 3417 lbs (1550 kg) Gross Vehicle Weight Rating: Approx. 4542 lbs (2060 kg) Wheels And Tires Wheel Size: 18 x 8.5 inches (standard) Bolt Pattern: 5 x 114.3 mm (5x4.5 inches) Tire Size: 245/40R18 (standard) 🛡️ Safety Features Ratings IIHS Rating: Good (various categories, check specific model year reports) NHTSA Rating: 4-Star Overall (check specific model year reports) Active Features ABS: Anti-lock Braking System with Electronic Brake-force Distribution (EBD) Traction Control: Multi-mode Traction Control System (TCS) Stability Control: Vehicle Dynamics Control (VDC) with STI tuning AWD System: Symmetrical All-Wheel Drive with DCCD for enhanced traction and stability Passive Features Airbags: Front, Side, Curtain Airbags; Driver's Knee Airbag Seatbelts: Pretensioners and Load Limiters Body Structure: High-strength steel body structure 💡 Technology Features Infotainment Head Unit: Subaru's infotainment system with 6.1-inch touchscreen (standard on STI), Bluetooth connectivity, USB port. Audio System: Available 9-speaker...