🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Year:

2011

Chassis Code:

GV / GR

Engine Code:

EJ257

👋 Introduction

Vehicle Segment:

Performance Compact Sedan/Hatchback

Target Audience:

Enthusiasts, rally fans, performance-oriented drivers seeking a capable all-wheel-drive vehicle.

Key Competitors:

Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS.

Performance Focus:

Emphasis on turbocharged power, all-wheel-drive grip, and sporty handling.

Rally Heritage:

Direct lineage from Subaru's successful World Rally Championship campaigns.

Dccd System:

Driver's Control Center Differential for adjustable front-to-rear torque split.

📋 Manual Details

Systems Covered Summary:

Comprehensive repair and overhaul of all major vehicle systems.

Estimated Pages:

Approximately 2500-3500 pages (typical for full workshop manuals of this era).

Manual Type:

Workshop Service Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, cylinder head, piston, crankshaft, camshaft, timing system, lubrication system, cooling system, engine management.

Engine Performance:

Turbocharger system, intercooler, fuel injection system, ignition system, emissions control system.

Transmission Drivetrain:

Manual transmission (6-speed), clutch system, differential, driveshafts, axles, AWD system (DCCD - Driver's Control Center Differential).

Suspension:

Front suspension (MacPherson strut), rear suspension (double wishbone), springs, dampers, anti-roll bars, alignment specifications.

Brakes:

Front and rear disc brakes, ABS (Anti-lock Braking System), brake fluid specifications, caliper and rotor replacement, brake bleeding.

Steering:

Power steering system, steering column, steering rack, tie rod ends.

Electrical System:

Battery, alternator, starter motor, lighting system, power windows, power locks, wiper system, horn, fuses, relays.

Electronics Control Units:

ECU (Engine Control Unit), TCM (Transmission Control Module), ABS/VDC control unit, SRS control unit, diagnostic trouble codes (DTCs).

Body Exterior:

Body panels, doors, hood, trunk, bumpers, glass, trim, corrosion protection.

Interior Components:

Seats, dashboard, center console, door panels, headliner, HVAC system, airbags (SRS).

Restraint Systems:

SRS airbag system, seatbelts, pre-tensioners.

Scheduled Maintenance:

Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections.

Engine Overhaul:

Complete engine rebuild procedures, component specifications, torque values, assembly sequences.

Transmission Repair:

Manual transmission disassembly, inspection, repair, and reassembly.

Brake System Repair:

Disc brake pad replacement, rotor replacement, caliper service, brake line repair, ABS bleeding.

Suspension Component Replacement:

Shock absorber/strut replacement, ball joint replacement, control arm replacement, wheel bearing replacement.

Electrical Troubleshooting:

Wiring diagrams, circuit testing procedures, component diagnosis, common electrical faults.

Diagnostic Procedures:

OBD-II diagnostic scan, DTC interpretation, live data analysis, system-specific troubleshooting trees.

Body Panel Repair:

Dent repair, panel replacement, welding procedures, seam sealing, corrosion prevention.

Air Conditioning Service:

Refrigerant handling, system evacuation and recharge, component replacement.

Depth Of Coverage:

Expert-level detail suitable for professional technicians and advanced DIY enthusiasts.

Diagnostic Troubleshooting:

Extensive troubleshooting guides with step-by-step procedures based on symptoms and diagnostic codes.

Component Specifications:

Precise torque specifications, clearances, fluid capacities, and measurement tolerances for all components.

Wiring Diagrams:

Detailed electrical wiring schematics for all vehicle systems.

Special Tools:

Identification and usage of Subaru-specific and general automotive special tools required for repairs.

📊 Manual Specifications

File Format:

PDF (Portable Document Format)

Searchability:

Typically text-searchable for quick information retrieval.

Printability:

Printable pages for workshop use.

Image Resolution:

Generally high-resolution images and diagrams suitable for clarity.

Binding Type:

N/A (Digital PDF format)

Paper Type:

N/A (Digital PDF format)

⚙️ Engine Specifications

Engine Type:

2.5L Turbocharged Boxer 4-Cylinder

Engine Code:

EJ257

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 4000 rpm

Redline:

7000 rpm

Fuel Induction:

Multi-point Fuel Injection (MPI) with Electronic Throttle Control (ETC)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Turbocharger:

IHI VF48 Twin-Scroll Turbocharger

Engine Oil Capacity:

5.8 US quarts (5.5 Liters) with filter change (check manual for precise capacity).

🔧 Transmission

Transmission Type:

6-speed Manual Transmission

Transmission Type:

N/A (STI models were manual-only).

Drivetrain:

Symmetrical All-Wheel Drive (AWD) with Driver's Control Center Differential (DCCD).

Manual Transmission Fluid:

Subaru Extra-S API GL-5 75W-90 Gear Oil (or equivalent).

Manual Transmission Capacity:

2.2 US quarts (2.1 Liters) (check manual for precise capacity).

📐 Dimensions

Length:

Sedan: 180.9 inches (4595 mm) / Hatchback: 173.8 inches (4415 mm)

Width:

70.1 inches (1780 mm)

Height:

58.1 inches (1475 mm)

Wheelbase:

103.0 inches (2615 mm)

Ground Clearance:

5.0 inches (127 mm)

Curb Weight:

Approximately 3373-3417 lbs (1530-1550 kg) depending on body style.

Gross Vehicle Weight Rating Gvwr:

Refer to vehicle's VIN plate or manual for exact GVWR.

🛡️ Safety Features

NHTSA Front Crash Rating:

4 Stars (for the Impreza model range of this generation, specific STI rating may vary).

IIHS Frontal Offset Rating:

Good (for the Impreza model range of this generation).

ABS:

Yes (4-wheel Anti-lock Braking System)

Traction Control:

Yes (Vehicle Dynamics Control - VDC)

Electronic Brake Force Distribution:

Yes (EBD)

Airbags:

Front dual-stage airbags, front side-impact airbags, front and rear side curtain airbags.

Seatbelts:

3-point front and rear seatbelts with pretensioners and force limiters.

Child Seat Anchors:

LATCH (Lower Anchors and Tethers for CHildren) system.

💡 Technology Features

Head Unit:

Factory-installed audio system with CD player, AM/FM radio, and auxiliary input. Optional navigation system may be present.

Vcsystem:

Vehicle Dynamics Control (VDC) with Sport mode integration.

Cruise Control:

Standard cruise control.

Auxiliary Input:

Standard auxiliary audio input jack.

Engine Management:

Subaru's Engine Control Unit (ECU) manages fuel delivery, ignition timing, boost pressure, and VDC integration.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 3 months (severe driving conditions) or 7,500 miles or 6 months (normal driving conditions) - consult manual for specifics.

Air Filter Replacement:

Every 15,000 miles or 12 months.

Cabin Air Filter Replacement:

Every 15,000 miles or 12 months.

Spark Plug Replacement:

Every 30,000 miles (platinum-tipped).

Timing Belt Replacement:

N/A (EJ257 uses a timing chain, not a belt).

Coolant Flush Interval:

Every 30,000 miles or 24 months.

Engine Oil Specification:

SAE 5W-30 Synthetic (API SN or higher, ILSAC GF-5 or higher).

Brake Fluid Specification:

DOT 3 or DOT 4

Power Steering Fluid Specification:

Subaru Genuine Power Steering Fluid (or equivalent).

Engine Knock Or Hesitation:

Potential for detonation on stock tune, especially with lower octane fuel or high ambient temperatures. Manual will cover diagnostic procedures.

Clutch Wear:

Can experience premature wear under aggressive driving conditions. Manual details clutch inspection and replacement.

Turbocharger Failure:

Can occur due to oil starvation or improper shutdown procedures. Manual covers inspection and maintenance for longevity.

Hatch Rattles:

Some owners report interior rattles, particularly from the rear hatch area. Manual may offer insights into trim adjustments.

Intercooler Sprayer Issues:

Potential for pump or nozzle issues on models equipped with the intercooler sprayer. Manual will cover troubleshooting.

📚 Vehicle History

Brand Focus:

Subaru is renowned for its Symmetrical All-Wheel Drive system and boxer engine configurations, often associated with rally racing and all-weather capability.

Impreza Lineage:

The Impreza WRX STI is the pinnacle performance variant of the Subaru Impreza line, born from Subaru's WRC success.

Third Generation Gd Gg To Gr Gv:

The 2011 model represents the transition of the WRX STI from the 'bug eye', 'blob eye', and 'hawkeye' GD/GG chassis to the GR/GV hatchback and sedan chassis, marking a significant design and platform update.

Production Years:

2007-2014 (GR/GV chassis generation)

Manufacturing Location:

Japan

🏆 Awards & Recognition

Popular Mechanics Editors Choice:

Often recognized for performance and handling by automotive publications.

Rally Performance Accolades:

Consistently praised for its motorsport-derived performance and rallying capabilities.

Car And Driver 10Best:

While specific WRX STI trims might not always make the '10Best' list, the WRX platform has frequently been included, highlighting its segment leadership.