🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2014 Codes Chassis Code: GVB/GVF (Hatchback/Sedan) Engine Code: EJ257 👋 Introduction Market Position Positioning: High-performance variant of the Subaru Impreza, positioned as a rally-bred, all-wheel-drive sports sedan/hatchback. Competitive Analysis Competitors: Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf R. Key Features Performance Focus: Iconic EJ257 turbocharged boxer engine, Symmetrical All-Wheel Drive system, performance-tuned suspension, powerful braking system. Target Audience Audience: Enthusiasts, performance drivers, DIY mechanics, and owners seeking in-depth knowledge for maintenance and repair. 📋 Manual Details Coverage Areas Coverage Scope: Complete factory service and repair Page Count Page Count: Hundreds of pages (Exact count not specified in product description, but implies comprehensive) Manual Type Manual Type: Workshop Service Repair Manual (Factory Official) Language Language: English Format Format: Downloadable (Likely PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, cylinder head, block, pistons, crankshaft, camshafts, timing belt/chain, lubrication system, cooling system Engine Management: Fuel injection, ignition system, emissions control, engine control unit (ECU) diagnostics, sensors, actuators Transmission: Manual transmission (Type: TY75) service, clutch, drivetrain (front/rear differentials, driveshafts, axles) Brakes: Brake system inspection, repair, hydraulic system, ABS, brake pad/rotor replacement, bleeding procedures Suspension Steering: Front and rear suspension components, shock absorbers, springs, control arms, bushings, power steering system, wheel alignment Electrical: Battery, charging system, starting system, lighting, wiring diagrams, fuses, relays, body electrical systems Body Chassis: Body panel removal/installation, interior trim, exterior components, chassis lubrication, rust prevention HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system service, refrigerant handling, component replacement Safety Systems: Airbag system, seatbelt mechanisms, SRS (Supplemental Restraint System) diagnosis Procedures Included Maintenance Procedures: Oil changes, filter replacements, spark plug replacement, fluid level checks, brake inspections, tire rotation Repair Procedures: Engine rebuilding, transmission overhauls, component replacement (e.g., turbocharger, intercooler), suspension repairs, electrical diagnostics and repair Troubleshooting: Diagnostic charts, symptom-based troubleshooting, fault code interpretation, common issue diagnosis Specifications Data: Torque specifications, clearances, fluid capacities, wiring diagrams, diagnostic trouble codes (DTCs) Technical Depth Depth: Comprehensive (covers from basic maintenance to full engine and drivetrain rebuilds) 📊 Manual Specifications File Format File Type: PDF (assumed for download format) Print Quality Printability: Printable in its entirety or specific sections Binding Type Binding: N/A (Downloadable, user prints and binds) Paper Type Paper Quality: N/A (Downloadable, user chooses paper type) ⚙️ Engine Specifications Primary Engine Engine Type: 2.5L DOHC Turbocharged Boxer (EJ257) Performance Horsepower: Approx. 305 hp @ 6000 rpm (US Spec) Torque: Approx. 290 lb-ft @ 4000 rpm (US Spec) Fuel System Fuel Delivery: Multi-point Fuel Injection (MPI) with twin-scroll turbocharger Engine Build Engine Block: Closed-deck aluminum alloy block (a key performance feature) Cooling System Cooling Type: Liquid-cooled, pressurized system 🔧 Transmission Standard Transmission Type: 6-speed Manual (TY75) Optional Optional Transmission: Not available for 2014 WRX STI Features Drivetrain: Symmetrical All-Wheel Drive (AWD) with Driver Controlled Center Differential (DCCD) Clutch Clutch Type: Hydraulically operated, single dry plate clutch 📐 Dimensions Exterior Length: Hatchback: 173.8 inches / Sedan: 180.9 inches Width: 70.7 inches Height: 58.1 inches Weights Curb Weight: Approx. 3,375 lbs (Hatchback) / 3,307 lbs (Sedan) Wheelbase: 103.3 inches 🛡️ Safety Features Ratings NHTSA Overall: 4 Stars (for 2014 model year, generally) Active Features Active Safety: Vehicle Dynamics Control (VDC), Traction Control System (TCS), Brembo Brakes, All-Wheel Drive Passive Features Passive Safety: Front, side, and curtain airbags, Whiplash Protection System 💡 Technology Features Infotainment Infotainment System: Subaru's standard infotainment system with touchscreen, CD player, AM/FM/SiriusXM, USB port, Bluetooth connectivity. Driver Assistance Driver Assistance Features: Vehicle Dynamics Control (VDC), All-Wheel Drive, performance-oriented braking system. (Note: Advanced driver-assistance systems like adaptive cruise control were not standard on this performance variant). Performance Tech Driver Controlled Center Differential: DCCD allows manual adjustment of front-to-rear torque split for optimal traction and handling. Engine Management: Engine control unit (ECU) with performance tuning capabilities, often referred to as the 'ECU Tune' or 'mapping'. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles or 3 months (severe driving) / 7,500 miles or 6 months (normal driving), consult manual for specifics. Spark Plug Replacement: Refer to manual, typically around 30,000-60,000 miles for iridium plugs. Fluid Specifications Engine Oil: SAE 5W-30, API SN/SM, ILSAC GF-5 certified (e.g., Subaru Synthetic 5W-30) Coolant: Subaru Super Coolant (Blue) or equivalent (50/50 mix with distilled water) Transmission Fluid: API GL-5, SAE 75W-90 (Manual Transmission) Differential Fluid: API GL-5, SAE 75W-90 (Front and Rear) Known Issues Engine Reliability: Ring land failures (especially with aggressive tuning/modification), oil consumption, head gasket issues (though less common on EJ257 compared to some older Subaru engines), turbocharger wear. Drivetrain Wear: Clutch wear due to aggressive driving, potential issues with DCCD actuator. Suspension Components: Bushing wear over time, especially on performance-oriented components. Preventative Maintenance Key Checks: Regular oil changes with quality oil, inspection of turbo oil feed/return lines, checking intercooler hoses for leaks, proper break-in procedures for new or rebuilt engines. 📚...