🏷️ Basic Information Identification Make: Subaru Model: WRX STI Year: 2008 Chassis Code: GR/GV (Hatchback/Sedan) Engine Codes: EJ257 (H4SO - Turbocharged, H4DOTC - Turbocharged DOHC) 👋 Introduction Market Market Position: The 2008 Subaru WRX STI represented the pinnacle of Subaru's rally-bred performance for that generation, positioned as a high-performance compact sports sedan and hatchback targeting enthusiasts and motorsport fans seeking exceptional handling, powerful turbocharged acceleration, and the renowned All-Wheel Drive system. Competitive Analysis Competitors: Competed directly with vehicles like the Mitsubishi Lancer Evolution, BMW 3 Series (performance variants), Audi S4, and Volkswagen Golf R. Key Features Key Features: Iconic turbocharged EJ257 boxer engine, Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD), performance-tuned suspension, aggressive aerodynamics, Recaro seating, Brembo brakes, multi-function display, driver-selectable engine maps (SI-DRIVE). 📋 Manual Details Coverage Coverage Areas: Engine (EJ257 variants including H4SO and STI specific), Transmission (6-speed manual), Drivetrain (Symmetrical AWD), Chassis (Suspension, Steering, Brakes), Body (Structure, Exterior, Interior), Electrical System (Wiring Diagrams, ECUs), HVAC, Fuel System, Cooling System, Emissions Control, Body Repair, Mechanisms and Functions, Diagnostics, Troubleshooting, Maintenance. Format Manual Type: Service Repair Manual Language: English Format: Downloadable PDF 📖 Manual Coverage Systems Systems Covered: Engine Mechanical, Engine Control (ECU), Fuel Injection, Ignition, Cooling, Lubrication, Exhaust, Intake, Turbocharger System, Clutch, Manual Transmission, Differential (Front, Center, Rear), Suspension (Front MacPherson Strut, Rear Double Wishbone), Steering, Brakes (Front 4-Piston Calipers, Rear 2-Piston Calipers, ABS, EBD), ABS/VDC Systems, SRS Airbag System, Body Electrical, Lighting, Power Accessories, HVAC, Body Structure, Exterior Panels, Interior Trim, Chassis Components. Procedures Procedures Included: Routine Maintenance (Oil Changes, Filter Replacements, Spark Plugs), Engine Diagnostics and Repair (Compression Testing, Timing Belt/Chain Service, Turbocharger Rebuild, Piston/Connecting Rod Replacement), Transmission Overhaul, Drivetrain Component Service, Brake System Bleeding and Pad/Rotor Replacement, Suspension Component Replacement (Shocks, Springs, Bushings), Steering System Service, Electrical Troubleshooting, HVAC System Diagnosis, Body Panel Alignment and Repair, Body Hardware Replacement, Diagnostic Trouble Code (DTC) Interpretation and Resolution, Wiring Harness Repair, Component Specific Removal and Installation Procedures. Depth Technical Depth: Comprehensive, covering everything from basic scheduled maintenance and fluid checks to in-depth engine rebuilds, transmission overhauls, complex electrical diagnostics, and body repair procedures. Includes detailed torque specifications, diagnostic flowcharts, and component testing methods suitable for professional technicians and advanced DIY enthusiasts. 📊 Manual Specifications File File Format: PDF (Portable Document Format) Searchability: Fully searchable text for quick access to specific information and repair procedures. Print Print Quality: High-resolution diagrams, illustrations, and text, suitable for printing individual sections or the entire manual. Binding Binding Type: N/A (Digital Download) Paper Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Primary Engine: 2.5L (2457cc) EJ257 turbocharged and intercooled Boxer 4-cylinder Performance Horsepower: Approx. 305 hp @ 6000 rpm Torque: Approx. 290 lb-ft @ 4000 rpm Fuel System Fuel System: Sequential multi-point fuel injection (MPI), Denso/Bosch fuel injectors, high-flow fuel pump. Engine Management Engine Management System: ECU (Engine Control Unit) with SI-DRIVE system for driver-selectable engine performance maps (Intelligent, Sport, Sport Sharp). Turbocharger Turbocharger Model: IHI VF48 (Ball-bearing, twin-scroll turbocharger) Compression Ratio Compression Ratio: 8.2:1 Bore X Stroke Bore X Stroke: 99.5 mm x 79.0 mm Valvetrain Valvetrain: DOHC (Dual Overhead Camshafts), 4 valves per cylinder, hydraulic lash adjusters. Intercooler Intercooler Type: Top-mounted, air-to-air intercooler. Cooling System Cooling System Type: Pressurized liquid cooling system with electric cooling fans. 🔧 Transmission Standard Standard Transmission: 6-speed manual transmission (TY856WD) Optional Optional Transmission: N/A (STI models exclusively offered with manual transmission) Features Dccd: Driver Controlled Center Differential (DCCD) with automatic and manual modes for torque distribution adjustment. Gear Ratios Gear Ratios: 1st: 3.636, 2nd: 2.200, 3rd: 1.545, 4th: 1.151, 5th: 0.971, 6th: 0.777 (Specific ratios may vary slightly by region) Fluid Type Transmission Fluid Spec: Subaru Extra-S Gear Oil (75W-90 GL-5) or equivalent high-quality synthetic GL-5. 📐 Dimensions Exterior Wheelbase: 2650 mm (104.3 inches) Length: 4415 mm (173.8 inches) - Hatchback, 4580 mm (180.3 inches) - Sedan Width: 1800 mm (70.9 inches) - Hatchback, 1795 mm (70.7 inches) - Sedan Height: 1475 mm (58.1 inches) - Hatchback, 1440 mm (56.7 inches) - Sedan Weights Curb Weight: Approx. 1550 kg (3417 lbs) - Hatchback, 1530 kg (3373 lbs) - Sedan Gross Vehicle Weight Rating: Approx. 2000 kg (4409 lbs) Cargo Cargo Volume: Approx. 300 L (10.6 cu ft) - Hatchback (with rear seats up), Approx. 400 L (14.1 cu ft) - Sedan Wheels Tires Wheel Bolt Pattern: 5x114.3 mm Standard Wheel Size: 18 x 8.5 inches (Enkei) Standard Tire Size: 245/40R18 🛡️ Safety Features Ratings NHTSA Front Impact Rating: 5 Stars (2008 Model Year, as per NHTSA data for similar Subaru models of the era) IIHS Top Safety Pick: Good (Frontal Offset, Side Impact, Roof Strength - specific rating for 2008 WRX STI may vary, but general Subaru Impreza platform performed well) Active Features Active Safety Features: Vehicle Dynamics Control (VDC) with yaw rate and G-force sensors, Anti-lock Braking System (ABS) with Electronic...