🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Year:

2013

Chassis Code:

GR/GV (for sedan and hatchback variants respectively)

Engine Code Primary:

EJ257

👋 Introduction

Segment:

Performance Compact Sedan/Hatchback

Niche:

Rally-inspired, all-wheel-drive performance vehicle

Direct Competitors:

Mitsubishi Lancer Evolution, Volkswagen Golf GTI/R, Ford Focus RS (in some markets), Subaru WRX (non-STI variant).

Performance Drivetrain:

Symmetrical All-Wheel Drive system with driver-controlled center differential (DCCD).

Engine Performance:

High-output turbocharged Boxer engine.

Suspension Handling:

Performance-tuned suspension and brakes for superior handling dynamics.

Rally Heritage:

Direct lineage to Subaru's World Rally Championship success.

📋 Manual Details

Coverage Scope:

Complete factory service repair workshop manual

Estimated Pages:

Extensive (typical factory manuals are 2000+ pages, specific count not provided but implied to be comprehensive)

Type:

Service Repair Workshop Manual

Language:

English

Format:

Downloadable PDF

📖 Manual Coverage

Engine Mechanical:

Complete engine overhaul, disassembly, assembly, timing, cooling system, lubrication system.

Engine Performance:

Fuel injection, ignition system, emissions control, turbocharger system, intercooler, intake and exhaust manifolds.

Transmission Manual:

6-speed manual transmission (TZ1B5LYAA), clutch system, driveshafts, differentials (front, center, rear).

Transmission Automatic:

Not applicable for WRX STI model in 2013.

Drivetrain:

All-Wheel Drive (Symmetrical AWD) system, viscous coupling center differential, helical front limited-slip differential, Torsen rear limited-slip differential.

Suspension:

Front MacPherson struts, rear double wishbone, springs, shock absorbers, anti-roll bars, bushings, wheel bearings.

Brakes:

Front Brembo 4-piston calipers, rear Brembo 2-piston calipers, ventilated discs, ABS system, brake fluid specifications, bleeding procedures.

Steering:

Hydraulic power steering system, steering rack, tie rods, steering column.

Electrical System:

Battery, alternator, starter, wiring diagrams, fuse box locations, relays, lighting systems (headlights, taillights, interior), horn.

Engine Control Unit:

ECU, sensors (MAP, MAF, TPS, O2, knock, crank, cam), actuators, diagnostic trouble codes (DTCs), troubleshooting procedures.

Body Exterior:

Body panels, doors, hood, trunk, bumpers, fenders, spoilers, glass, seals, chassis components.

Body Interior:

Seats, dashboard, interior trim, airbags, seat belts, HVAC controls, infotainment system integration.

Climate Control:

Air conditioning system, heater core, blower motor, refrigerant R134a, diagnosis and repair.

Safety Systems:

Airbag system diagnosis, SRS control module, seatbelt pre-tensioners, ABS/VDC integration.

Scheduled Maintenance:

Oil changes, filter replacements, spark plug replacement, fluid checks and changes (coolant, brake fluid, transmission fluid, differential fluid, power steering fluid), belt inspections.

Troubleshooting:

Systematic diagnostic procedures for common and uncommon faults, DTC interpretation, component testing.

Repair Rebuild:

Detailed instructions for engine rebuilds, transmission overhaul, suspension component replacement, brake caliper and rotor replacement, turbocharger replacement, clutch replacement.

Diagnostic Tools:

Information on using Subaru Select Monitor (SSM) or compatible OBD-II scanners for diagnosis.

Torque Specifications:

Precise torque values for all critical fasteners across all systems.

Wiring Diagrams:

Comprehensive electrical system wiring diagrams for easy diagnosis and repair.

Body Repair:

Panel alignment, dent repair, welding procedures (where applicable), rust prevention.

Emissions Control Service:

Catalytic converter diagnostics, EVAP system testing, EGR system service.

Depth:

Factory-level technical detail, suitable for professional technicians and advanced DIY enthusiasts.

Diagnostic Capability:

Advanced diagnostic procedures, including sensor data interpretation and component testing.

Rebuild Instructions:

Complete step-by-step rebuild procedures for major mechanical components.

📊 Manual Specifications

Format:

PDF (Portable Document Format)

Quality:

High resolution, suitable for printing individual pages or the entire manual.

Type:

Not applicable (Digital Download PDF)

Type:

Not applicable (Digital Download PDF)

Text Search:

Likely text-searchable PDF, allowing quick navigation to specific topics.

License:

No expiry dates (per product description), implying a perpetual license for the user.

Fees:

No extra fees (per product description).

⚙️ Engine Specifications

Engine Type:

Horizontally-opposed (Boxer), turbocharged, intercooled, DOHC, 16-valve

Displacement:

2.5 Liters (2457 cc)

Bore X Stroke:

99.5 mm x 79.0 mm

Compression Ratio:

8.2:1

Fuel Requirement:

Premium Unleaded Gasoline (91 octane or higher recommended)

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 4000 rpm

Induction:

Sequential Electronic Fuel Injection (SEFI)

Ignition:

Electronic ignition with knock control

Coolant Type:

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

Oil Type:

SAE 5W-30 Synthetic Engine Oil (API SN or ILSAC GF-5 certified)

Oil Capacity:

Approx. 5.1 quarts (4.8 liters) with filter change

🔧 Transmission

Type:

6-speed manual transmission

Gear Ratios Final Drive:

3.55:1

Type:

None available for STI model in 2013

Dccd:

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

Manual Transmission Fluid Type:

API GL-4 (Subaru Extra-S or equivalent)

Differential Fluid Front Type:

API GL-5 Hypoid Gear Oil (Subaru Extra-S or equivalent)

Differential Fluid Rear Type:

API GL-5 Hypoid Gear Oil (Subaru Extra-S or equivalent)

📐 Dimensions

Length Hatchback:

174.0 inches (4420 mm)

Length Sedan:

180.9 inches (4595 mm)

Width:

70.7 inches (1795 mm)

Height Hatchback:

58.3 inches (1480 mm)

Height Sedan:

58.1 inches (1475 mm)

Wheelbase:

103.0 inches (2615 mm)

Ground Clearance:

5.1 inches (130 mm)

Curb Weight Hatchback:

Approx. 3400 lbs (1540 kg)

Curb Weight Sedan:

Approx. 3300 lbs (1495 kg)

Gross Vehicle Weight Rating Gvwr:

Approx. 4387 lbs (1990 kg)

Towing Capacity:

Not recommended

Wheelbase:

103.0 inches (2615 mm)

Track Width Front:

60.4 inches (1535 mm)

Track Width Rear:

60.2 inches (1530 mm)

Tire Size Front:

245/40R18

Tire Size Rear:

245/40R18

Wheel Size:

18 x 8.5 inches

Bolt Pattern:

5 x 100 mm

Offset:

ET55

Cargo Volume Hatchback:

22.0 cu ft (seats up) / 47.2 cu ft (seats down)

Cargo Volume Sedan:

11.3 cu ft

🛡️ Safety Features

NHTSA Overall Rating:

4 out of 5 stars (for related Impreza models, STI specific data may vary slightly).

IIHS Top Safety Pick:

Likely achieved 'Good' ratings in crashworthiness tests for models of this generation, but specific STI variant data should be confirmed.

ABS:

Anti-lock Braking System with Electronic Brake-force Distribution (EBD)

Vdc:

Vehicle Dynamics Control (Traction Control and Stability Control)

AWD:

Symmetrical All-Wheel Drive system for enhanced traction and stability.

Akebono Brakes:

High-performance Brembo brakes designed for increased stopping power and heat dissipation.

Airbags:

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

Seatbelts:

3-point seatbelts with pre-tensioners and force limiters for front occupants, 3-point seatbelts for rear occupants.

Crumple Zones:

Advanced body structure with front and rear crumple zones for impact energy absorption.

Child Seat Anchors:

LATCH (Lower Anchors and Tethers for CHildren) system.

💡 Technology Features

Head Unit:

Base models typically featured a 6-speaker audio system with a CD player, auxiliary input, and Bluetooth connectivity. Higher trims may have had optional navigation systems.

Display:

Multi-function display in the instrument cluster for vehicle information and performance settings.

Traction Control:

Integrated into the Vehicle Dynamics Control (VDC) system.

Stability Control:

Vehicle Dynamics Control (VDC).

All Wheel Drive Control:

Driver Controlled Center Differential (DCCD) for adjustable torque split.

Bluetooth:

Standard Bluetooth hands-free phone and audio streaming capabilities.

Usb Aux Input:

Standard USB port and 3.5mm auxiliary audio input for media devices.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles (6,000 km) or 6 months, whichever comes first (severe driving conditions) OR 7,500 miles (12,000 km) or 12 months (normal driving conditions). Consult manual for specific driving condition definitions.

Engine Air Filter Replacement:

Every 15,000 miles (24,000 km) or 12 months, or more frequently if driving in dusty conditions.

Cabin Air Filter Replacement:

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

Spark Plug Replacement:

Every 30,000 miles (48,000 km) due to high-performance nature ( iridium-tipped plugs).

Coolant Flush Replacement:

Initial replacement at 60,000 miles (96,000 km) or 60 months, then every 30,000 miles (48,000 km) or 30 months thereafter.

Brake Fluid Replacement:

Every 15,000 miles (24,000 km) or 12 months, or more frequently based on usage and conditions.

Transmission Fluid Change Interval:

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

Differential Fluid Change Interval:

Every 30,000 miles (48,000 km) or 24 months (front and rear differentials).

Power Steering Fluid:

Subaru ATF-HP or Dexron III compatible fluid.

Brake Fluid:

DOT 3 or DOT 4 high-performance brake fluid.

Head Gaskets:

While the EJ257 is generally robust, early EJ series engines had head gasket issues. Later revisions like those in the 2013 STI are improved, but regular inspection and maintenance are crucial. The manual will detail inspection procedures.

Piston Ringland Failure:

Can occur with aggressive tuning or prolonged high heat without proper cooling. Manual details engine internal inspection and maintenance of cooling system.

Clutch Wear:

High-performance driving can accelerate clutch wear. Manual provides clutch inspection, replacement, and adjustment procedures.

Turbo Charger Maintenance:

Proper warm-up and cool-down procedures are vital. Manual outlines turbocharger system checks and maintenance.

Suspension Bushings:

Performance-oriented suspension can experience wear in bushings over time. Manual covers inspection and replacement of all suspension components and bushings.

📚 Vehicle History

Rally Legacy:

Subaru's extensive and successful history in the World Rally Championship (WRC), heavily influencing the WRX STI's development and performance characteristics.

Generations:

The 2013 model represents the third generation (GE/GH/GR/GV) of the Subaru Impreza WRX STI, which debuted in 2007 for the standard Impreza and received significant updates for the STI variant, including the introduction of the hatchback body style and revised powertrains/suspension.

Major Updates 2013:

While the core platform remained, the 2013 model year typically saw minor aesthetic tweaks and potentially calibration changes, building on the previous years' updates. The GR hatchback and GV sedan body styles were the primary offerings.

Manufacturing Location:

Ota, Gunma, Japan (Subaru's primary manufacturing facility)

Production Years For Generation:

Third generation WRX STI: approximately 2008-2014.

🏆 Awards & Recognition

Performance Awards:

The Subaru WRX STI has consistently been lauded by automotive publications for its performance, handling, and rally-inspired driving experience. While specific awards for the 2013 model are numerous, it typically continued the legacy of praise for its segment.

Track Day Performance:

Highly regarded for its capability in track day environments and autocross events, often outperforming more expensive sports cars in certain metrics.

Emissions Compliance:

Meets relevant emissions standards for the model year (e.g., EPA, CARB). The manual will detail specific emission control system components and diagnostics.