🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2012 Codes Chassis Code: GV/GR 👋 Introduction Market Position Vehicle Segment: Performance Compact Sedan/Hatchback (rally-bred homologation special) Target Audience: Enthusiasts, performance drivers, rally fans, DIY mechanics. Competitive Analysis Key Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R. Key Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver's Control Centre Differential (DCCD) and Active Torque Distribution. Engine Performance: High-output turbocharged Boxer engine with strong low-end and mid-range torque. Handling: Renowned for exceptional grip, steering response, and chassis dynamics. Braking: Powerful Brembo brakes providing superior stopping power and fade resistance. Interior Focus: Driver-centric cockpit with performance-oriented seating and controls. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual Language: English Format: PDF Documentation Scope: Repair and Overhaul Procedures Assumed Technician Knowledge: Fully conversant with general automobile practices 📖 Manual Coverage Systems Covered Engine: EJ257 2.5L Turbocharged Boxer Engine, including assembly, disassembly, diagnostics, tuning, and emissions control systems. Transmission: 6-speed Manual Transmission (TY856), including clutch, drivetrain components (differentials, axles), and gearbox overhaul. Suspension: Performance-tuned suspension system (STI specific), including struts, springs, anti-roll bars, bushings, and alignment procedures. Brakes: Brembo performance braking system, including front and rear calipers, rotors, pads, fluid flush, and ABS system diagnostics. Electrical: Comprehensive electrical schematics, wiring diagrams, battery, alternator, starter, ignition system, lighting, audio system, and diagnostic port (OBD-II). Body And Chassis: Body panel repair, structural integrity, door mechanisms, glass replacement, and underbody protection. Cooling System: Radiator, thermostat, water pump, coolant specifications, and leak detection procedures. Fuel System: Fuel injectors, fuel pump, fuel lines, fuel pressure regulation, and emissions control (EVAP). Exhaust System: Catalytic converter, mufflers, exhaust manifold, and gasket replacement. HVAC: Air conditioning system, heater core, climate control unit, and refrigerant handling. Procedures Included Maintenance: Oil changes, filter replacements (oil, air, cabin), spark plug replacement, fluid checks and top-offs, belt inspection. Troubleshooting: Diagnostic charts, symptom-based troubleshooting for engine, transmission, electrical, and chassis issues. Repair: Engine rebuild, transmission overhaul, brake caliper replacement, suspension component replacement, electrical component repair. Overhaul: Complete disassembly and reassembly of major components like the engine and transmission. Diagnostics: Advanced diagnostic procedures using scan tools, testing of sensors, actuators, and control modules. Alignment: Wheel alignment specifications and procedures for performance handling. Torque Specifications: Detailed torque values for all critical fasteners across all systems. Technical Depth Depth Level: Comprehensive, covering routine maintenance to complete engine and transmission rebuilds. Diagnostic Capability: Advanced diagnostic fault code interpretation and system-specific testing. Component Rebuild: Detailed instructions for rebuilding major mechanical and electrical assemblies. Schematics Detail: High-resolution electrical wiring diagrams with component identification. 📊 Manual Specifications File Format File Type: PDF Searchability: Text-searchable PDF for easy navigation and information retrieval. Printability: Printable pages for workshop use. Resolution: High-resolution graphics and diagrams. Binding Type Binding Type Physical: Not applicable (PDF format) Paper Type Paper Type Physical: Not applicable (PDF format) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5L DOHC 16-valve turbocharged horizontally-opposed (Boxer) 4-cylinder Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.4:1 Horsepower: 305 HP @ 6000 RPM Torque: 290 lb-ft @ 4000 RPM Performance Redline: 7000 RPM Fuel System Fuel Delivery: Multi-point fuel injection (MPI) with high-flow injectors Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Turbocharger: Single-scroll IHI VF48 turbocharger with intercooler 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission (TY856) Gear Ratios: 1st: 3.636, 2nd: 2.244, 3rd: 1.615, 4th: 1.243, 5th: 0.972, 6th: 0.756, Reverse: 3.545 Optional Optional Transmission: N/A for WRX STI model year 2012 Features Drivetrain Layout: Symmetrical All-Wheel Drive (AWD) Center Differential: Driver's Control Centre Differential (DCCD) with Auto/Manual modes Rear Differential: Mechanical Limited-Slip Differential (LSD) Front Differential: Viscous Coupling Limited-Slip Differential (VLSD) 📐 Dimensions Exterior Length: 179.5 inches (4560 mm) Width: 70.7 inches (1796 mm) Height: 57.7 inches (1466 mm) Wheelbase: 103.2 inches (2620 mm) Track Width Front: 60.6 inches (1540 mm) Track Width Rear: 60.4 inches (1535 mm) Ground Clearance: 5.0 inches (127 mm) Weights Curb Weight: Approx. 3,417 lbs (1550 kg) for sedan, 3,439 lbs (1560 kg) for hatchback Gross Vehicle Weight Rating: 4,630 lbs (2100 kg) Towing Capacity: Not Recommended Cargo Trunk Volume Sedan: 11.3 cubic feet (320 Liters) Cargo Volume Hatchback: 20.0 cubic feet (566 Liters) with rear seats up Cargo Volume Hatchback Seats Folded: 44.5 cubic feet (1260 Liters) 🛡️ Safety Features Ratings NHTSA Overall Rating: 4 Stars (for 2012 model) IIHS Top Safety Pick: Yes (for 2012 model) Active Features ABS: 4-wheel Anti-lock Braking System (ABS) with Electronic Brake-force Distribution (EBD) Traction Control: Vehicle Dynamics Control (VDC) with Traction Control System (TCS) AWD: Symmetrical All-Wheel Drive (AWD) for enhanced traction and stability Brake Assist: Brake Assist System (BAS) Passive Features Airbags: Dual-stage front airbags, front side-impact airbags, side-curtain airbags (front and rear). Seatbelts: 3-point height-adjustable front seatbelts with pretensioners and load limiters, rear 3-point seatbelts. Child Anchors: LATCH...