🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2011 Codes Chassis Code: GR/GV 👋 Introduction Market Position Positioning: The 2011 Subaru Impreza WRX STI is positioned as a high-performance, rally-bred compact sports sedan, targeting enthusiasts seeking exceptional handling, turbocharged power, and all-weather capability. Competitive Analysis Competitors: Key competitors at the time included the Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, and similar performance-oriented vehicles in the compact segment. Key Features Distinguishing Features: Symmetrical All-Wheel Drive, Driver's Control Center Differential (DCCD), SI-Drive system, potent turbocharged Boxer engine, performance-tuned suspension, aggressive styling, and a legacy of motorsport success. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Manual / Repair Manual Language: English Format: PDF Completeness: Comprehensive, covering all aspects of repair and maintenance. 📖 Manual Coverage Systems Covered Engine: 2.5L EJ257 Turbocharged Boxer Engine Engine Management: ECU diagnostics, fuel injection, ignition system, emissions control Transmission: 6-speed Manual Transmission (TY757) Drivetrain: All-Wheel Drive (Symmetrical AWD) system, differentials (front, center, rear), driveshafts Suspension: Front strut type, rear multi-link, springs, dampers, anti-roll bars Brakes: Front Brembo 4-piston calipers, Rear Brembo 2-piston calipers, ABS, EBD, brake fluid specifications Steering: Hydraulic power steering system Electrical System: Battery, alternator, starter, lighting, wiring diagrams, fuse box locations, relays Climate Control: HVAC system, A/C refrigerant, heater core, blower motor Body And Chassis: Body panels, doors, hood, trunk, interior trim, chassis components, chassis reinforcement Safety Systems: Airbag system, seatbelts, SRS components Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspection Troubleshooting: Diagnostic procedures, fault codes, symptom analysis for all major systems Repair: Component removal and installation, engine overhaul, transmission rebuild, suspension component replacement, brake caliper rebuild, electrical component repair Diagnostics: Detailed diagnostic flowcharts, component testing procedures, use of Subaru Select Monitor (SSM) or equivalent tools Calibration: Alignment procedures, steering angle sensor calibration, other necessary system calibrations Technical Depth Depth: Expert level, suitable for professional technicians and advanced DIY enthusiasts. Includes detailed specifications, torque values, special tool requirements, and step-by-step instructions. 📊 Manual Specifications File Format PDF Quality: High resolution, clear text and images. Searchable content. Printable: Yes, printable for workshop use. Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Code: EJ257 Engine Type: 2.5-liter turbocharged, horizontally opposed (Boxer) 4-cylinder Bore X Stroke: 99.5 mm x 79.0 mm Compression Ratio: 8.4:1 Valve Train: DOHC, 16 valves, AVCS (Active Valve Control System) Performance Horsepower Hp: 305 hp @ 6000 rpm Torque Lb-Ft: 290 lb-ft @ 4000 rpm Fuel System Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Fuel Delivery: Multi-point fuel injection, Turbocharged by a twin-scroll IHI VF48 turbocharger 🔧 Transmission Standard Transmission Type: 6-speed Manual Transmission Transmission Code: TY757 Optional Optional Transmission: N/A (Only Manual Available for STI) Features Dccd: Driver's Control Center Differential (DCCD) for manual adjustment of center differential locking characteristics 📐 Dimensions Exterior Length: 179.5 inches (4559 mm) Width: 70.7 inches (1796 mm) Height: 57.7 inches (1466 mm) Wheelbase: 103.0 inches (2616 mm) Weights Curb Weight: Approximately 3373 lbs (1530 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star NHTSA Side Impact: 5-Star IIHS Frontal Offset: Good Active Features ABS: Standard Anti-lock Braking System Ebd: Standard Electronic Brake-force Distribution Vcs: Standard Vehicle Stability Control TCS: Standard Traction Control System 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 load limiters 💡 Technology Features Infotainment Audio System: Standard AM/FM/CD stereo with auxiliary input and SiriusXM Satellite Radio capability. Optional upgraded Boston Acoustics audio system. Navigation: Optional factory-installed GPS navigation system. Driver Assistance Si Drive: Subaru Intelligent Drive (SI-DRIVE) system offering three distinct engine and drivetrain response modes: Intelligent (I), Sport (S), and Sport Sharp (S#). Connectivity Bluetooth: Available Bluetooth hands-free phone connectivity and audio streaming on equipped models. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,750 miles or 3.75 months for severe driving, or 7,500 miles or 7.5 months for normal driving (refer to owner's manual for specifics). Engine Oil Type: Synthetic SAE 0W-30 or 5W-30 (meeting API SN or ILSAC GF-5) Engine Oil Capacity: 5.8 US quarts (5.5 liters) with filter change Coolant Type: Subaru Super Coolant (Blue) or equivalent silicate-free, long-life coolant Brake Fluid: DOT 3 or DOT 4 brake fluid Transmission Fluid Type: API GL-5, SAE 75W-90 (Synthetic recommended for STI) Differential Fluid Type: API GL-5, SAE 75W-90 (Synthetic recommended for STI) Known Issues Head Gaskets: While less common on EJ257 compared to earlier EJ25 engines, head gasket integrity is a point of vigilance. Regular coolant checks and proper engine operating temperatures are crucial. Piston Ringland Failure: Can occur in high-performance applications due to detonation or improper tuning. The manual details engine inspection and repair procedures to mitigate this. Clutch Wear: As with...