Subaru Impreza WRX STI 2011 Workshop Service Repair Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2011 Codes Chassis Code: GV / GR Engine Code: EJ257 👋 Introduction Market Position Segment: Performance Compact Sedan/Hatchback Target...

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Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Codes

Chassis Code:

GV / GR

Engine Code:

EJ257

👋 Introduction

Market Position

Segment:

Performance Compact Sedan/Hatchback

Target Audience:

Enthusiasts, rally fans, performance driving community

Competitive Analysis

Key Rivals:

Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf GTI/R

Key Features

Performance Drivetrain:

Turbocharged Boxer engine, Symmetrical All-Wheel Drive

Suspension Tuning:

Performance-tuned suspension for agile handling

Chassis Stiffness:

Reinforced chassis for rally-bred performance

Braking System:

Performance braking system, often Brembo equipped

📋 Manual Details

Coverage Areas

Manual Type:

Workshop Service Repair Manual

Language:

English

Format:

Digital Download (Printable)

Page Count

Estimated Pages:

1000+

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Complete overhaul, component testing, torque specifications

Engine Management System:

ECU diagnosis, sensor testing, fuel injection, ignition timing

Transmission Manual:

Clutch system, gearbox overhaul, gear ratios, shift linkage

Transmission Automatic:

Not applicable for WRX STI model

Drivetrain:

Symmetrical All-Wheel Drive system, differentials, driveshafts, prop shaft

Suspension:

Front/rear suspension components, alignment specifications, damper service

Brakes:

ABS system, brake fluid specifications, caliper/rotor service, parking brake

Steering:

Power steering system, steering rack, column components

Electrical System:

Wiring diagrams, battery, alternator, starter, lighting, fuses, relays

Climate Control:

HVAC system diagnosis, refrigerant, compressor service

Body And Chassis:

Body panel removal/installation, chassis components, collision repair basics

Interior:

Seating, dashboard, trim panel removal, airbags

Procedures Included

Routine Maintenance:

Oil changes, filter replacements, fluid checks, spark plug replacement

Troubleshooting:

Diagnostic procedures for common faults, symptom-based diagnostics

Component Repair:

Step-by-step instructions for removing, repairing, and reinstalling major components

Overhaul Procedures:

Complete engine and transmission rebuild procedures

Wiring Diagrams:

Detailed electrical schematics for all systems

Specifications Data:

Torque values, clearances, fluid capacities, electrical specifications

Diagnostic Trouble Codes:

Listing and interpretation of OBD-II codes

Technical Depth

Depth Level:

Comprehensive Factory Level

Diagnostics:

Advanced diagnostics, scan tool usage, sensor data interpretation

Rebuilding:

Full rebuild procedures for engine, transmission, differentials

📊 Manual Specifications

File Format

Digital Format:

Print Quality

Reproducibility:

High resolution, suitable for printing professional quality pages

Binding Type

Print Binding:

Not Applicable (Digital Download)

Paper Type

Print Paper Type:

Not Applicable (Digital Download)

Searchability

Text Search:

Searchable PDF content for quick information retrieval

⚙️ Engine Specifications

Primary Engine

Engine Type:

EJ257 Turbocharged Boxer 4-Cylinder

Displacement:

2.5 Liters (2457 cc)

Bore X Stroke:

99.5 mm x 79.0 mm

Compression Ratio:

8.2:1

Performance

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 4000 rpm

Redline:

6500 rpm

Fuel System

Fuel Type:

Unleaded Premium (91+ Octane Recommended)

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Turbocharger:

Twin-Scroll Turbocharger with Intercooler

Fluid Specifications

Engine Oil Type:

SAE 5W-30 Synthetic (API SN/SP or ILSAC GF-5/GF-6)

Engine Oil Capacity:

4.8 US quarts (4.5 Liters) with filter change

Coolant Type:

Subaru Super Coolant (Blue)

Coolant Capacity:

7.4 US quarts (7.0 Liters)

🔧 Transmission

Standard

Transmission Type:

6-Speed Manual Transmission

Transmission Code:

TY856WB1AA

Features

All Wheel Drive:

Symmetrical All-Wheel Drive with Driver-Controlled Center Differential (DCCD)

Differentials:

Front Helical Limited Slip Differential (LSD), Rear Mechanical Limited Slip Differential (LSD)

Fluid Specifications

Manual Transmission Fluid Type:

Subaru Extra-S GL5 75W-90 or equivalent

Manual Transmission Fluid Capacity:

2.5 US quarts (2.4 Liters)

Front Differential Fluid Type:

Subaru Extra-S GL5 75W-90 or equivalent

Front Differential Fluid Capacity:

0.9 US quarts (0.85 Liters)

Rear Differential Fluid Type:

Subaru Extra-S GL5 75W-90 or equivalent

Rear Differential Fluid Capacity:

0.9 US quarts (0.85 Liters)

📐 Dimensions

Exterior

Length:

179.7 inches (4565 mm)

Width:

70.7 inches (1795 mm)

Height:

57.7 inches (1465 mm)

Wheelbase:

103.0 inches (2615 mm)

Front Track:

60.2 inches (1530 mm)

Rear Track:

60.0 inches (1525 mm)

Ground Clearance:

5.1 inches (130 mm)

Weights

Curb Weight:

3397 lbs (1541 kg) (Sedan) / 3417 lbs (1550 kg) (Hatchback)

Gross Vehicle Weight Rating:

4500 lbs (2041 kg)

Cargo

Trunk Capacity:

11.3 cu ft (Sedan)

Hatch Cargo Capacity:

19.1 cu ft (Seats Up) / 43.8 cu ft (Seats Down) (Hatchback)

Wheels Tires

Wheel Size:

18 x 8.5 inches

Bolt Pattern:

5 x 114.3 mm (5 x 4.5 inches)

Tire Size:

245/40R18

Tire Pressure Front:

30 psi

Tire Pressure Rear:

30 psi

🛡️ Safety Features

Ratings

NHTSA Front Crash:

5-Star (Driver & Passenger)

NHTSA Side Crash:

5-Star (Front & Rear Seat)

NHTSA Rollover:

4-Star

Active Features

Traction Control:

Standard

Electronic Stability Control:

Standard (Vehicle Dynamics Control - VDC)

Antilock Braking System:

Standard (ABS)

Brake Assist:

Standard

Passive Features

Airbags Front:

Driver and Front Passenger Airbags

Airbags Side:

Front Side-Impact Airbags

Airbags Curtain:

Front and Rear Side-Curtain Airbags

Seatbelts:

3-Point ELR Front and Rear Seatbelts with Pretensioners

Child Seat Anchors:

LATCH System

💡 Technology Features

Infotainment

Audio System:

Premium audio system with CD player, MP3 compatibility, auxiliary input, and optional navigation.

Display:

Multi-function display in dashboard for vehicle settings and audio information.

Driver Assistance

Cruise Control:

Standard cruise control system.

Keyless Entry:

Standard keyless entry system.

Intermittent Wipers:

Adjustable intermittent front wipers.

Connectivity

Usb Input:

Optional USB input for media playback.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 6 months, whichever comes first (severe driving conditions)

Air Filter Replacement:

Every 15,000 miles or 12 months

Spark Plug Replacement:

Every 30,000 miles (NGK Iridium)

Coolant Flush:

Every 30,000 miles or 24 months

Timing Belt Replacement:

Not applicable (Timing Chain)

Transmission Fluid Change:

Every 30,000 miles or 24 months (Manual Transmission)

Fluid Specifications

Brake Fluid Type:

DOT 3 or DOT 4

Power Steering Fluid Type:

Subaru ATF-HP or equivalent

Clutch Fluid Type:

DOT 3 or DOT 4

Known Issues

Head Gaskets:

Less common on EJ257 compared to earlier EJ25, but still a potential concern requiring specific repair procedures detailed in the manual.

Ring Land Failure:

Can occur with aggressive tuning or improper maintenance; manual provides critical torque and lubrication specs.

Clutch Wear:

High-performance usage can lead to premature clutch wear; manual details replacement procedures.

Turbocharger Issues:

Potential for oil starvation or bearing failure if maintenance is neglected; manual outlines proper lubrication and service.

📚 Vehicle History

Brand Heritage

Rally Legacy:

Subaru's long and successful history in World Rally Championship (WRC) influences the WRX STI's design and performance

Model Evolution

Impreza Generation:

Third Generation (GR/GV, 2008-2014)

Sti Distinction:

STI (Subaru Tecnica International) variants represent the highest performance level of the Impreza line

Production

Manufacturing Plant:

Ota City, Gunma, Japan

Production Years:

2008-2014 (Third Generation)

🏆 Awards & Recognition

Recognitions

Car And Driver Ten Best:

The Subaru Impreza WRX STI (and its predecessors) has frequently been recognized by Car and Driver on its annual '10Best Cars' list, highlighting its performance and value.

Motor Trend Car Of The Year:

While the WRX STI often competes in categories for performance cars, the Impreza line has historically been considered for MotorTrend's Car of the Year awards.

Certifications

Emission Standards:

Meets U.S. EPA and CARB emission standards for its model year.