🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2011 Codes Chassis Code: GR/GV Engine Code: EJ257 👋 Introduction Market Position Positioning: The Subaru Impreza WRX STI 2011 represents a pinnacle of rally-inspired performance in a production sedan. It is positioned as a highly capable performance vehicle appealing to enthusiasts seeking all-wheel-drive traction, turbocharged power, and responsive handling. Competitive Analysis Competitors: Primary competitors include the Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf R, and other sport compacts offering high performance and AWD capabilities. Key Features Performance Highlights: Symmetrical All-Wheel Drive, turbocharged Boxer engine, performance-tuned suspension, Brembo brakes, Driver-Controlled Center Differential (DCCD). Target Audience: Automotive enthusiasts, rally fans, performance car drivers, experienced DIY mechanics. 📋 Manual Details Coverage Areas Primary Coverage: North America Secondary Coverage: Global (technical specifications generally applicable) Page Count Estimated Page Count: Approximately 2000+ pages (typical for comprehensive service manuals of this era) Manual Type Type: Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder head, block, pistons, crankshaft, camshafts, timing system, lubrication system, cooling system, intake manifold, exhaust manifold. Engine Performance: Turbocharger system, intercooler, fuel injection system, ignition system, emissions control system. Transmission: 6-speed manual transmission (TY856WR1AA), clutch system, drivetrain components (front, center, rear differentials), driveshafts, axles. Brakes: Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, ABS, EBD, brake fluid specifications, hydraulic system. Suspension: Front MacPherson struts, rear multi-link suspension, springs, dampers, anti-roll bars, alignment specifications. Steering: Power-assisted rack and pinion, steering column, tie rods. Electrical System: Battery, charging system (alternator), starting system, lighting, ignition, audio system, power windows, mirrors, central locking. Body And Chassis: Body structure, doors, hood, trunk, bumpers, interior trim, sound deadening, chassis components. HVAC: Air conditioning system, heating system, ventilation, climate control. Safety Systems: Airbag system (SRS), seat belts, pre-tensioners. Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and changes, spark plug replacement, brake pad/rotor replacement, belt inspections. Troubleshooting: Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides, electrical circuit diagnostics, engine performance issues. Repair: Engine overhaul, transmission rebuild, suspension component replacement, brake caliper repair, electrical component diagnosis and replacement, body panel repair. Installation: Component replacement procedures (e.g., alternator, starter, radiator, turbocharger). Specifications And Tolerances: Torque specifications, measurement tolerances, clearances, diagnostic data. Technical Depth Depth: Comprehensive, suitable for professional technicians and advanced DIY enthusiasts. Covers everything from basic maintenance to complex diagnostics and complete engine/transmission rebuilds. 📊 Manual Specifications File Format Quality: High-resolution, searchable PDF with clear diagrams and schematics. Printable pages. Print Quality Print Quality: Designed for clear printing of diagrams and text. Binding Type Binding Type: Not applicable (PDF Download) Paper Type Paper Type: Not applicable (PDF Download) ⚙️ Engine Specifications Primary Engine Engine Type: 2.5L Turbocharged DOHC 16-valve Boxer (EJ257) Performance Horsepower: 305 hp @ 6000 rpm Torque: 290 lb-ft @ 2800 rpm Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Cooling System Coolant Type: Subaru Super Coolant (or equivalent ethylene glycol-based coolant with Subaru conditioners) Lubrication System Oil Type: SAE 5W-30 Synthetic Engine Oil Oil Capacity: 5.5 US quarts (5.2 liters) with filter change Turbocharger Turbo Model: IHI VF48 (or similar) 🔧 Transmission Standard Type: 6-speed Manual Transmission Gear Ratios: Refer to manual for specific ratios (e.g., 1st: 3.636, 2nd: 2.235, 3rd: 1.524, 4th: 1.121, 5th: 0.971, 6th: 0.763) Transmission Fluid Type: GL-5 Hypoid Gear Oil (e.g., Subaru Extra S or equivalent 75W-90) Features Dccd: Driver-Controlled Center Differential (allows manual adjustment of front/rear torque split) 📐 Dimensions Exterior Length: 179.5 inches (4560 mm) Width: 70.7 inches (1795 mm) Height: 58.1 inches (1475 mm) Wheelbase: 103.0 inches (2615 mm) Weights Curb Weight: Approximately 3375 lbs (1530 kg) Gross Vehicle Weight Rating: Refer to vehicle placard (typically around 4500 lbs) Cargo Trunk Volume: 11.3 cu ft (320 L) Wheels And Tires Wheel Size: 18 x 8.5 inches Bolt Pattern: 5x114.3mm (5x4.5 inches) Tire Size: 245/40R18 🛡️ Safety Features Ratings NHTSA Front Crash: 5-star NHTSA Side Crash: 5-star NHTSA Rollover: 4-star Active Features Traction Control: Yes (with AWD and DCCD) Electronic Stability Control: Yes (VDC - Vehicle Dynamics Control) Anti Lock Brakes: Yes (ABS) Brake Bias: Electronic Brake-force Distribution (EBD) Passive Features Airbags: Driver and front passenger airbags, front side-impact airbags, side curtain airbags. Seatbelts: 3-point front and rear seatbelts with pretensioners and force limiters. 💡 Technology Features Infotainment Audio System: Standard AM/FM/CD/MP3 player with auxiliary input. Optional premium audio system available. Navigation: Optional factory navigation system available. Driver Assistance Cruise Control: Standard Tire Pressure Monitoring System: Standard (TPMS) Connectivity Auxiliary Input: Standard 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles (6,000 km) or 3 months, whichever comes first, under severe driving conditions (rally-style driving, frequent short trips, track use). Standard interval typically 7,500 miles (12,000 km) or 6 months. Air Filter Replacement: Every 15,000 miles (24,000...