🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2011 Chassis Code: GRF (Widebody Hatchback) Engine Variant: EJ257 (2.5L Turbocharged Boxer) Codes Engine Code: EJ257 Transmission Code: TY856WB1CA (6-speed Manual) 👋 Introduction Market Position Segment: Performance Compact / Rally Homologation Special Target Audience: Enthusiast owners, DIY mechanics, performance tuners. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, BMW M235i. Key Features Performance Focus: Engineered for high-performance driving, rally heritage. Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD). Engine Technology: Robust EJ257 Boxer engine with twin-scroll turbocharger. 📋 Manual Details Coverage Areas All Models Trims: True All Engines: True Page Count Estimated Pages: 2000+ Manual Type Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, timing belt, pistons, connecting rods, crankshaft, cylinder heads, valve train, lubrication system, cooling system. Engine Management: Fuel injection, ignition system, emissions control, ECU diagnosis and troubleshooting, sensors, actuators, turbocharger system. Transmission: 6-speed manual gearbox (TY856), clutch system, drivetrain, AWD system (DCCD), differentials (front, center, rear). Brakes: Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, ABS, EBD, brake lines, master cylinder, brake fluid specifications. Suspension: Front and rear suspension components, struts, springs, sway bars, alignment specifications, bushings. Steering: Power steering system, steering column, tie rods, wheel alignment. Electrical System: Battery, charging system, starter, lighting, power windows, wipers, horn, fuses, relays, wiring diagrams. Body And Interior: Body panels, doors, hood, trunk, interior trim, seats, dashboard, HVAC system. Diagnostic Tools: OBD-II system, diagnostic trouble codes (DTCs), troubleshooting flowcharts. Procedures Included Routine Maintenance: Oil change, filter replacement, fluid checks and top-offs, tire rotation. Troubleshooting: Diagnostic procedures for common and uncommon faults across all systems. Repair Procedures: Step-by-step guides for component replacement and repair for engine, transmission, brakes, etc. Disassembly Assembly: Detailed instructions for dismantling and reassembling major vehicle components. Technical Specifications: Torque specifications for fasteners, clearances, fluid capacities, and other critical measurements. Technical Depth Depth: Comprehensive, covering everything from basic maintenance to full engine rebuilds and advanced diagnostics. 📊 Manual Specifications File Format Format: PDF Searchable: Yes, text-searchable for quick information retrieval. Printable: Yes, designed for printing individual pages or sections. Resolution: High resolution for clear diagrams and images. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Horizontally-opposed (Boxer) turbocharged 4-cylinder Displacement: 2457 cc (2.5 Liters) Performance Horsepower: 305 hp @ 6000 RPM Torque: 290 lb-ft @ 4000 RPM Redline: 7500 RPM Fuel System Fuel Delivery: Multi-point fuel injection (MPI), top-feed fuel injectors. Fuel Requirement: Premium Unleaded Gasoline (91 Octane or higher recommended) Engine Internals Compression Ratio: 8.2:1 Bore X Stroke: 99.5 mm x 80.0 mm Turbocharger Turbo Type: IHI VF48 Twin-Scroll Intercooler: Top-mounted air-to-air intercooler 🔧 Transmission Standard Type: 6-speed Manual Dccd: Driver Controlled Center Differential (manual locking capability) Optional Type: N/A (STI was manual-only for this generation) Features Differential Types: Front helical limited-slip, center mechanical/electronic (DCCD), rear mechanical limited-slip. Fluid Specifications Gear Oil Capacity: 3.0 L (Rear Diff), 2.5 L (Center Diff/Transfer Case) Gear Oil Type: API GL-5, SAE 75W-90 (Subaru Extra-S recommended) 📐 Dimensions Exterior Length: 4415 mm (173.8 in) Width: 1800 mm (70.9 in) Height: 1475 mm (58.1 in) Wheelbase: 2650 mm (104.3 in) Track Width Front: 1530 mm (60.2 in) Track Width Rear: 1535 mm (60.4 in) Ground Clearance: 140 mm (5.5 in) Weights Curb Weight: Approximately 1550 kg (3417 lbs) Gross Vehicle Weight Rating: 1990 kg (4387 lbs) Towing Capacity: Not Recommended Cargo Cargo Volume: Approximately 301 L (10.6 cu ft) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star NHTSA Side Impact: 5-Star IIHS Headlight Rating: Good Active Features ABS: Standard Anti-lock Braking System Ebd: Standard Electronic Brake-force Distribution Vsc: Standard Vehicle Stability Control Traction Control: Standard Traction Control System Passive Features Airbags: Driver and front passenger airbags, front side-impact airbags, side curtain airbags. Seatbelts: 3-point height-adjustable front seatbelts with pretensioners and load limiters, rear 3-point seatbelts. Body Structure: Reinforced chassis with crumple zones. 💡 Technology Features Infotainment Head Unit: Standard AM/FM/CD/MP3 audio system with auxiliary input. Optional Audio: Available Bose premium audio system. Navigation: Optional factory navigation system available on some trims. Driver Assistance Cruise Control: Standard electronic cruise control. Keyless Entry: Standard keyless entry and alarm system. Connectivity Bluetooth: Not standard on all models, some may have aftermarket or dealer-installed options. Climate Control System: Manual or automatic climate control depending on trim level. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 6 months (severe driving conditions), 7,500 miles or 6 months (normal driving). Engine Air Filter: Inspect every 15,000 miles, replace as needed or every 30,000 miles. Cabin Air Filter: Inspect every 15,000 miles, replace as needed or every 15,000 miles. Spark Plugs: Replace every 30,000 miles (NGK iridium recommended). Timing Belt: Replace every 105,000 miles or...