🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Year:

2011

Chassis Code:

GR/GV

Engine Code:

EJ257

👋 Introduction

Positioning:

The Subaru Impreza WRX STI 2011 represents a pinnacle of rally-inspired performance in a production sedan. It is positioned as a highly capable performance vehicle appealing to enthusiasts seeking all-wheel-drive traction, turbocharged power, and responsive handling.

Competitors:

Primary competitors include the Mitsubishi Lancer Evolution, Ford Focus RS, Volkswagen Golf R, and other sport compacts offering high performance and AWD capabilities.

Performance Highlights:

Symmetrical All-Wheel Drive, turbocharged Boxer engine, performance-tuned suspension, Brembo brakes, Driver-Controlled Center Differential (DCCD).

Target Audience:

Automotive enthusiasts, rally fans, performance car drivers, experienced DIY mechanics.

📋 Manual Details

Primary Coverage:

North America

Secondary Coverage:

Global (technical specifications generally applicable)

Estimated Page Count:

Approximately 2000+ pages (typical for comprehensive service manuals of this era)

Type:

Repair Service Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine Mechanical:

Engine assembly, cylinder head, block, pistons, crankshaft, camshafts, timing system, lubrication system, cooling system, intake manifold, exhaust manifold.

Engine Performance:

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

Transmission:

6-speed manual transmission (TY856WR1AA), clutch system, drivetrain components (front, center, rear differentials), driveshafts, axles.

Brakes:

Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, ABS, EBD, brake fluid specifications, hydraulic system.

Suspension:

Front MacPherson struts, rear multi-link suspension, springs, dampers, anti-roll bars, alignment specifications.

Steering:

Power-assisted rack and pinion, steering column, tie rods.

Electrical System:

Battery, charging system (alternator), starting system, lighting, ignition, audio system, power windows, mirrors, central locking.

Body And Chassis:

Body structure, doors, hood, trunk, bumpers, interior trim, sound deadening, chassis components.

HVAC:

Air conditioning system, heating system, ventilation, climate control.

Safety Systems:

Airbag system (SRS), seat belts, pre-tensioners.

Maintenance:

Oil changes, filter replacements, fluid checks and changes, spark plug replacement, brake pad/rotor replacement, belt inspections.

Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides, electrical circuit diagnostics, engine performance issues.

Repair:

Engine overhaul, transmission rebuild, suspension component replacement, brake caliper repair, electrical component diagnosis and replacement, body panel repair.

Installation:

Component replacement procedures (e.g., alternator, starter, radiator, turbocharger).

Specifications And Tolerances:

Torque specifications, measurement tolerances, clearances, diagnostic data.

Depth:

Comprehensive, suitable for professional technicians and advanced DIY enthusiasts. Covers everything from basic maintenance to complex diagnostics and complete engine/transmission rebuilds.

📊 Manual Specifications

Quality:

High-resolution, searchable PDF with clear diagrams and schematics. Printable pages.

Print Quality:

Designed for clear printing of diagrams and text.

Binding Type:

Not applicable (PDF Download)

Paper Type:

Not applicable (PDF Download)

⚙️ Engine Specifications

Engine Type:

2.5L Turbocharged DOHC 16-valve Boxer (EJ257)

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 2800 rpm

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher recommended)

Coolant Type:

Subaru Super Coolant (or equivalent ethylene glycol-based coolant with Subaru conditioners)

Oil Type:

SAE 5W-30 Synthetic Engine Oil

Oil Capacity:

5.5 US quarts (5.2 liters) with filter change

Turbo Model:

IHI VF48 (or similar)

🔧 Transmission

Type:

6-speed Manual Transmission

Gear Ratios:

Refer to manual for specific ratios (e.g., 1st: 3.636, 2nd: 2.235, 3rd: 1.524, 4th: 1.121, 5th: 0.971, 6th: 0.763)

Transmission Fluid Type:

GL-5 Hypoid Gear Oil (e.g., Subaru Extra S or equivalent 75W-90)

Dccd:

Driver-Controlled Center Differential (allows manual adjustment of front/rear torque split)

📐 Dimensions

Length:

179.5 inches (4560 mm)

Width:

70.7 inches (1795 mm)

Height:

58.1 inches (1475 mm)

Wheelbase:

103.0 inches (2615 mm)

Curb Weight:

Approximately 3375 lbs (1530 kg)

Gross Vehicle Weight Rating:

Refer to vehicle placard (typically around 4500 lbs)

Trunk Volume:

11.3 cu ft (320 L)

Wheel Size:

18 x 8.5 inches

Bolt Pattern:

5x114.3mm (5x4.5 inches)

Tire Size:

245/40R18

🛡️ Safety Features

NHTSA Front Crash:

5-star

NHTSA Side Crash:

5-star

NHTSA Rollover:

4-star

Traction Control:

Yes (with AWD and DCCD)

Electronic Stability Control:

Yes (VDC - Vehicle Dynamics Control)

Anti Lock Brakes:

Yes (ABS)

Brake Bias:

Electronic Brake-force Distribution (EBD)

Airbags:

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

Seatbelts:

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

💡 Technology Features

Audio System:

Standard AM/FM/CD/MP3 player with auxiliary input. Optional premium audio system available.

Navigation:

Optional factory navigation system available.

Cruise Control:

Standard

Tire Pressure Monitoring System:

Standard (TPMS)

Auxiliary Input:

Standard

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles (6,000 km) or 3 months, whichever comes first, under severe driving conditions (rally-style driving, frequent short trips, track use). Standard interval typically 7,500 miles (12,000 km) or 6 months.

Air Filter Replacement:

Every 15,000 miles (24,000 km) or 12 months, or as needed based on inspection.

Cabin Air Filter Replacement:

Every 15,000 miles (24,000 km) or 12 months.

Spark Plug Replacement:

Iridium spark plugs typically last up to 105,000 miles (168,000 km), but inspection is recommended earlier, especially for performance driving.

Brake Fluid Flush:

Every 30,000 miles (48,000 km) or 24 months.

Transmission Fluid Change:

Every 30,000 miles (48,000 km) for manual transmission, or as specified for differential fluids.

Engine Oil Viscosity:

SAE 5W-30 (Synthetic recommended for STI)

Coolant Type:

Subaru Super Coolant or equivalent with Subaru conditioners

Brake Fluid Type:

DOT 3 or DOT 4

Transmission Fluid:

GL-5 Hypoid Gear Oil 75W-90

Differential Fluid:

GL-5 Hypoid Gear Oil 75W-90 (front and rear)

Head Gaskets:

While less common on the EJ257 compared to earlier EJ series, head gasket integrity should always be monitored. Proper maintenance is crucial.

Ring Land Failures:

Can occur in high-performance applications with inadequate tuning or excessive boost pressure. The manual provides critical torque and assembly data to prevent this.

Clutch Wear:

Aggressive driving can lead to accelerated clutch wear. The manual details clutch inspection and replacement procedures.

Turbocharger Issues:

Oil starvation or debris can damage the turbo. Regular oil changes with quality oil are essential. The manual covers turbo inspection and replacement.

📚 Vehicle History

Rally Connection:

Subaru's extensive history in the World Rally Championship (WRC), utilizing Impreza models, significantly influenced the WRX and WRX STI's performance and brand image.

Gd To Gr/Gv Transition:

The 2011 model is part of the third generation (GR/GV) Impreza, which transitioned from the sedan-only GD chassis to a hatchback (GR) and then a sedan (GV) for the performance models, representing a significant styling and engineering update.

Manufacturing Location:

Ota City, Gunma Prefecture, Japan

🏆 Awards & Recognition

Sport Compact Car Achievement Award:

The WRX STI platform has historically received accolades from automotive publications for its performance and handling capabilities.

Performance Car Of The Year:

Often cited in 'best performance car' lists within its segment during its production years.