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Subaru Impreza WRX STI 2015 Service Repair Workshop Manual
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Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2015 Codes Chassis Code: GVB (Hatchback), GRF (Hatchback) Engine Code: EJ257 Introduction Market Position Segment: Performance Compact Sedan/Hatchback (WRC Homologation...
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Art.-Nr: 425182
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| Basic Information | |
| Identification | |
| Make: | Subaru |
| Model: | Impreza WRX STI |
| Year: | 2015 |
| Codes | |
| Chassis Code: | GVB (Hatchback), GRF (Hatchback) |
| Engine Code: | EJ257 |
| Introduction | |
| Market Position | |
| Segment: | Performance Compact Sedan/Hatchback (WRC Homologation Special) |
| Target Audience: | Enthusiasts, performance drivers, rally sport fans |
| Competitive Analysis | |
| Key Competitors: | Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, Honda Civic Type R |
| Key Features | |
| Performance Focus: | Symmetrical All-Wheel Drive, turbocharged Boxer engine, performance-tuned suspension, aggressive styling |
| Manual Value Proposition: | Provides in-depth, professional-level repair and maintenance guidance for the specialized WRX STI variant |
| Manual Details | |
| Coverage Areas | |
| Major Topics: | Engine, Transmission, Drivetrain, Suspension, Brakes, Electrical Systems, HVAC, Bodywork, Diagnostics, Maintenance, Repair, Troubleshooting |
| Page Count | |
| Estimated Pages: | 2000+ |
| Manual Type | |
| Type: | Service and Repair Workshop Manual |
| Language | |
| Language: | English |
| Format | |
| Format: | Digital (PDF) |
| Manual Coverage | |
| Systems Covered | |
| Engine Mechanical: | Engine assembly, cylinder heads, pistons, crankshaft, timing belt/chain, lubrication system, cooling system |
| Engine Performance: | Fuel injection system, ignition system, turbocharger, intercooler, emission control systems (EVAP, secondary air injection) |
| Transmission Drivetrain: | Manual transmission (TY856), clutch system, all-wheel drive system (DCCD), differentials (front, rear, center), driveshafts, axles |
| Suspension Steering: | Front and rear suspension components (struts, springs, control arms, sway bars), power steering system, steering rack |
| Brakes: | Brake system components (calipers, rotors, pads, master cylinder, ABS), parking brake |
| Electrical Systems: | Wiring diagrams, battery, charging system, starting system, lighting (headlights, taillights, interior), power windows, mirrors, central locking |
| HVAC: | Air conditioning system, heating system, ventilation, blower motor, climate control unit |
| Bodywork Interior: | Exterior panels, doors, hood, trunk, bumpers, interior trim, seats, airbags |
| Diagnostics: | OBD-II diagnostic codes, troubleshooting procedures, sensor testing, ECU diagnosis |
| Procedures Included | |
| Scheduled Maintenance: | Oil changes, filter replacements, fluid flushes, spark plug replacement, inspections |
| Engine Repair: | Engine rebuilds, head gasket replacement, turbocharger overhaul, timing belt/chain replacement procedures |
| Transmission Service: | Transmission fluid change, clutch replacement, drivetrain component inspection and repair |
| Brake Service: | Brake pad and rotor replacement, brake fluid flush, caliper overhaul |
| Electrical Troubleshooting: | Fault finding for various electrical systems using wiring diagrams and diagnostic steps |
| Body Repair: | Panel replacement, dent repair, bumper repair, door mechanism adjustment |
| Technical Depth | |
| Depth: | Comprehensive from basic maintenance to complex overhauls and diagnostics, suitable for professional mechanics and experienced DIYers |
| Manual Specifications | |
| File Format | |
| File Type: | |
| Searchability: | Searchable text content |
| Printability: | Printable pages |
| Print Quality | |
| Image Resolution: | High-resolution diagrams and illustrations |
| Binding Type | |
| Binding: | N/A (Digital Format) |
| Paper Type | |
| Paper: | N/A (Digital Format) |
| Engine Specifications | |
| Primary Engine | |
| Engine Type: | 2.5L Turbocharged DOHC Flat-4 (EJ257) |
| Bore X Stroke: | 99.5 mm x 79.0 mm |
| Compression Ratio: | 8.2:1 |
| Valve Train: | Dual Overhead Camshafts (DOHC), 4 valves per cylinder |
| Performance | |
| Horsepower: | 305 hp @ 6000 rpm |
| Torque: | 290 lb-ft @ 4000 rpm |
| Fuel System | |
| Fuel Delivery: | Multi-point Fuel Injection (MPI) with Electronic Throttle Control |
| Fuel Type: | Premium Unleaded Gasoline (91 Octane or higher recommended) |
| Turbocharging | |
| Turbocharger Model: | IHI VF48 |
| Intercooler: | Top-mounted air-to-air intercooler |
| Transmission | |
| Standard | |
| Type: | 6-speed Manual Transmission (TY856) |
| Optional | |
| Type: | N/A for WRX STI model year 2015 |
| Features | |
| Dccd: | Driver Controlled Center Differential (DCCD) with automatic and manual modes |
| Differentials: | Helical LSD front differential, Torsen LSD rear differential |
| Dimensions | |
| Exterior | |
| Length: | 173.8 inches (Hatchback) |
| Width: | 70.7 inches |
| Height: | 58.1 inches (Hatchback) |
| Wheelbase: | 104.9 inches |
| Weights | |
| Curb Weight: | Approx. 3,373 lbs (Hatchback) |
| Gross Vehicle Weight Rating: | Not specified, consult vehicle label |
| Safety Features | |
| Ratings | |
| NHTSA Overall Rating: | 5-Star (2015 Model Year Impreza) |
| Active Features | |
| ABS: | 4-wheel Anti-lock Braking System (ABS) |
| Traction Control: | Vehicle Dynamics Control (VDC) with Sport Mode |
| AWD: | Subaru Symmetrical All-Wheel Drive |
| Passive Features | |
| Airbags: | Front dual-stage airbags, front side-impact airbags, side-curtain airbags, driver's knee airbag |
| Seatbelts: | 3-point front and rear seatbelts with pretensioners and force limiters |
| Technology Features | |
| Infotainment | |
| Head Unit: | Standard touchscreen infotainment system with CD player, AM/FM/HD Radio, USB/iPod control, Bluetooth connectivity |
| Driver Assistance | |
| Vehicle Dynamics Control: | Advanced VDC system with Sport Mode for enhanced handling and stability control |
| All Wheel Drive Control: | DCCD allows driver to adjust center differential lockup for various driving conditions. |
| Connectivity | |
| Bluetooth: | Bluetooth hands-free phone and audio streaming |
| Maintenance | |
| Service Intervals | |
| Oil Change Interval: | Every 3,750 miles or 6 months (severe duty) / 7,500 miles or 12 months (normal duty) |
| Engine Oil Type: | SAE 5W-30, API SN/SP, ILSAC GF-5/GF-6A certified synthetic oil recommended |
| Oil Filter Part Number: | Subaru: 15208AA100, Aftermarket: Wix 57712, K&N HP-3001 |
| Fluid Specifications | |
| Coolant Type: | Subaru Super Coolant (Blue) or equivalent silicate-free, long-life coolant |
| Transmission Fluid Type: | Subaru Extra MT (75W-90 GL-5) for 6MT |
| Differential Fluid Type: | Subaru Extra-S (75W-90 GL-5) for Front and Rear Diffs, and DCCD Center Diff |
| Brake Fluid Type: | DOT 3 or DOT 4 brake fluid |
| Known Issues | |
| Engine Ringland Failure: | Potential for ringland failure on piston #4 due to detonation, especially with aggressive tuning or poor fuel. Manual details proper diagnosis and repair. |
| Clutch Wear: | High-performance clutch can wear faster under aggressive driving. Manual provides clutch inspection and replacement procedures. |
| Turbo Failure: | Turbocharger bearing failure can occur due to lack of lubrication or oil contamination. Manual covers turbo inspection and replacement. |
| Vehicle History | |
| Brand Heritage | |
| Rally Roots: | Subaru's long and successful history in World Rally Championship (WRC) series, influencing the WRX STI's development. |
| Model Evolution | |
| Generation: | Third Generation (GR/GV Chassis, 2008-2014, with facelift in 2011) and Fourth Generation (VA Chassis, starting 2015). This manual covers the transition and initial VA chassis. |
| Production | |
| Production Years: | 2007-2014 (GR/GV), 2015-2021 (VA) |
| Manufacturing Location: | Ota City, Gunma Prefecture, Japan |
| Awards & Recognition | |
| Recognitions | |
| Performance Awards: | Consistently praised by automotive journalists for its handling, AWD system, and rally-bred performance heritage. |
| Ratings | |
| Consumer Reports Rating: | Varies by specific year and reporting period, often noted for performance but with caveats on fuel economy and interior refinement. |
| Certifications | |
| Emissions Certification: | Meets EPA and California Air Resources Board (CARB) emission standards for its model year. |