Subaru Impreza WRX STI 2011 Workshop Repair Service Manual

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🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2011 Chassis Code: GRF (Widebody Hatchback) Engine Variant: EJ257 (2.5L Turbocharged Boxer) Codes Engine Code: EJ257 Transmission Code: TY856WB1CA...

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Type: Car

Vendor:

Sku: 423867

Tags: 2011 Car Cars Impreza WRX STI Misc Subaru

Product variants

Description

🏷️ Basic Information

Identification

Make:

Subaru

Model:

Impreza WRX STI

Year:

Chassis Code:

GRF (Widebody Hatchback)

Engine Variant:

EJ257 (2.5L Turbocharged Boxer)

Codes

Engine Code:

EJ257

Transmission Code:

TY856WB1CA (6-speed Manual)

👋 Introduction

Market Position

Segment:

Performance Compact / Rally Homologation Special

Target Audience:

Enthusiast owners, DIY mechanics, performance tuners.

Competitive Analysis

Competitors:

Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS, BMW M235i.

Key Features

Performance Focus:

Engineered for high-performance driving, rally heritage.

Drivetrain:

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

Engine Technology:

Robust EJ257 Boxer engine with twin-scroll turbocharger.

📋 Manual Details

Coverage Areas

All Models Trims:

All Engines:

Page Count

Estimated Pages:

2000+

Manual Type

Type:

Workshop Repair Service Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Complete overhaul, timing belt, pistons, connecting rods, crankshaft, cylinder heads, valve train, lubrication system, cooling system.

Engine Management:

Fuel injection, ignition system, emissions control, ECU diagnosis and troubleshooting, sensors, actuators, turbocharger system.

Transmission:

6-speed manual gearbox (TY856), clutch system, drivetrain, AWD system (DCCD), differentials (front, center, rear).

Brakes:

Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, ABS, EBD, brake lines, master cylinder, brake fluid specifications.

Suspension:

Front and rear suspension components, struts, springs, sway bars, alignment specifications, bushings.

Steering:

Power steering system, steering column, tie rods, wheel alignment.

Electrical System:

Battery, charging system, starter, lighting, power windows, wipers, horn, fuses, relays, wiring diagrams.

Body And Interior:

Body panels, doors, hood, trunk, interior trim, seats, dashboard, HVAC system.

Diagnostic Tools:

OBD-II system, diagnostic trouble codes (DTCs), troubleshooting flowcharts.

Procedures Included

Routine Maintenance:

Oil change, filter replacement, fluid checks and top-offs, tire rotation.

Troubleshooting:

Diagnostic procedures for common and uncommon faults across all systems.

Repair Procedures:

Step-by-step guides for component replacement and repair for engine, transmission, brakes, etc.

Disassembly Assembly:

Detailed instructions for dismantling and reassembling major vehicle components.

Technical Specifications:

Torque specifications for fasteners, clearances, fluid capacities, and other critical measurements.

Technical Depth

Depth:

Comprehensive, covering everything from basic maintenance to full engine rebuilds and advanced diagnostics.

📊 Manual Specifications

File Format

Format:

Searchable:

Yes, text-searchable for quick information retrieval.

Printable:

Yes, designed for printing individual pages or sections.

Resolution:

High resolution for clear diagrams and images.

Binding Type

Binding:

N/A (Digital Download)

Paper Type

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Horizontally-opposed (Boxer) turbocharged 4-cylinder

Displacement:

2457 cc (2.5 Liters)

Performance

Horsepower:

305 hp @ 6000 RPM

Torque:

290 lb-ft @ 4000 RPM

Redline:

7500 RPM

Fuel System

Fuel Delivery:

Multi-point fuel injection (MPI), top-feed fuel injectors.

Fuel Requirement:

Premium Unleaded Gasoline (91 Octane or higher recommended)

Engine Internals

Compression Ratio:

8.2:1

Bore X Stroke:

99.5 mm x 80.0 mm

Turbocharger

Turbo Type:

IHI VF48 Twin-Scroll

Intercooler:

Top-mounted air-to-air intercooler

🔧 Transmission

Standard

Type:

6-speed Manual

Dccd:

Driver Controlled Center Differential (manual locking capability)

Optional

Type:

N/A (STI was manual-only for this generation)

Features

Differential Types:

Front helical limited-slip, center mechanical/electronic (DCCD), rear mechanical limited-slip.

Fluid Specifications

Gear Oil Capacity:

3.0 L (Rear Diff), 2.5 L (Center Diff/Transfer Case)

Gear Oil Type:

API GL-5, SAE 75W-90 (Subaru Extra-S recommended)

📐 Dimensions

Exterior

Length:

4415 mm (173.8 in)

Width:

1800 mm (70.9 in)

Height:

1475 mm (58.1 in)

Wheelbase:

2650 mm (104.3 in)

Track Width Front:

1530 mm (60.2 in)

Track Width Rear:

1535 mm (60.4 in)

Ground Clearance:

140 mm (5.5 in)

Weights

Curb Weight:

Approximately 1550 kg (3417 lbs)

Gross Vehicle Weight Rating:

1990 kg (4387 lbs)

Towing Capacity:

Not Recommended

Cargo

Cargo Volume:

Approximately 301 L (10.6 cu ft)

🛡️ Safety Features

Ratings

NHTSA Front Impact:

5-Star

NHTSA Side Impact:

5-Star

IIHS Headlight Rating:

Active Features

Standard Anti-lock Braking System

Standard Electronic Brake-force Distribution

Standard Vehicle Stability Control

Traction Control:

Standard Traction Control System

Passive Features

Airbags:

Driver and front passenger airbags, front side-impact airbags, side curtain airbags.

Seatbelts:

3-point height-adjustable front seatbelts with pretensioners and load limiters, rear 3-point seatbelts.

Body Structure:

Reinforced chassis with crumple zones.

💡 Technology Features

Infotainment

Head Unit:

Standard AM/FM/CD/MP3 audio system with auxiliary input.

Optional Audio:

Available Bose premium audio system.

Navigation:

Optional factory navigation system available on some trims.

Driver Assistance

Cruise Control:

Standard electronic cruise control.

Keyless Entry:

Standard keyless entry and alarm system.

Connectivity

Bluetooth:

Not standard on all models, some may have aftermarket or dealer-installed options.

Climate Control

System:

Manual or automatic climate control depending on trim level.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,750 miles or 6 months (severe driving conditions), 7,500 miles or 6 months (normal driving).

Engine Air Filter:

Inspect every 15,000 miles, replace as needed or every 30,000 miles.

Cabin Air Filter:

Inspect every 15,000 miles, replace as needed or every 15,000 miles.

Spark Plugs:

Replace every 30,000 miles (NGK iridium recommended).

Timing Belt:

Replace every 105,000 miles or 84 months.

Fluid Specifications

Engine Oil Capacity:

5.5 US Quarts (5.2 Liters) with filter (SAE 5W-30 Synthetic)

Coolant Capacity:

7.7 US Quarts (7.3 Liters) (Subaru Super Coolant or equivalent)

Brake Fluid Type:

DOT 3 or DOT 4

Known Issues

Head Gaskets:

While less common than in earlier EJ engines, gasket leaks can still occur, especially with modified engines.

Piston Ring Land Failure:

Can occur in higher-mileage or heavily modified engines due to detonation or excessive cylinder pressure.

Clutch Wear:

High-performance clutch can wear faster with aggressive driving.

Suspension Bushings:

Can degrade over time, affecting handling and ride quality.

📚 Vehicle History

Brand Heritage

Motorsport Legacy:

Strong rally heritage dating back to Subaru's WRC success.

Model Evolution

Generation Code:

Third Generation (2007-2014) - GR/GH/GE/GV chassis

Trim Level Distinction:

WRX STI represents the top-tier performance variant of the Impreza line.

Styling Changes:

This model year (2011) typically refers to the facelifted version of the GR chassis with revised styling.

Production

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Motor Trend Award:

While the Impreza line has received awards, specific 2011 WRX STI awards are less prominent compared to earlier generations; however, it consistently ranked highly in performance compact categories.

Ratings

Car And Driver 10Best:

The Impreza WRX/STI has frequently appeared on Car and Driver's 10Best lists in previous generations, establishing its performance credentials.

Certifications

Homologation:

Built with motorsport (rallying) homologation in mind, influencing its chassis and drivetrain design.