Segment:
Performance Compact Sedan/Wagon, Rally-Bred Sports Car
Target Audience:
Enthusiasts, Performance Drivers, DIY Mechanics, Professional Technicians
Competitors 2006:
Mitsubishi Lancer Evolution, Subaru WRX (non-STI variants), Ford Focus SVT, Volkswagen GTI
Rally Heritage:
Direct lineage from World Rally Championship (WRC) winning cars, emphasizing AWD grip and performance
Dccd:
Driver Controlled Center Differential (DCCD) for adjustable torque distribution, enhancing handling and traction
Turbocharged Engine:
High-performance turbocharged boxer engine known for its unique sound and power delivery
Authenticity:
Represents genuine factory service information used by Subaru technicians
Completeness:
Covers all aspects of the vehicle, making it an indispensable resource for owners and mechanics alike
Usability:
Detailed illustrations, schematics, and step-by-step instructions facilitate accurate repairs and maintenance
Primary Coverage:
Complete Service, Repair, Maintenance, Troubleshooting, Diagnostics, Wiring Diagrams
Secondary Coverage:
Bodywork, Chassis, Electrical Systems, HVAC, Emissions
Estimated Page Count:
Approximately 2000+
Type:
Workshop Service Repair Manual
Format:
Digital (Likely PDF)
Powertrain:
Engine Mechanical, Engine Control System (ECU), Fuel System, Ignition System, Lubrication System, Cooling System, Exhaust System, Turbocharger System, Intercooler System
Drivetrain:
Manual Transmission (6-speed DCCD), All-Wheel Drive System (AWD), Center Differential (DCCD), Rear Differential, Driveshafts, Axles
Suspension Steering:
Front Suspension (MacPherson Strut), Rear Suspension (Multi-link), Power Steering System, Wheel Alignment
Brakes:
Front Brakes (Ventilated Discs, Brembo Calipers), Rear Brakes (Solid Discs), ABS (Anti-lock Braking System), Brake Fluid Specifications
Electrical:
Battery, Charging System, Starting System, Lighting System, Fuses, Relays, Instrumentation, ECU Pinouts, Wiring Diagrams for all systems
Body Chassis:
Body Panels, Doors, Hood, Trunk, Glass, Interior Trim, Chassis Components, Corrosion Protection
Comfort Convenience:
HVAC (Heating, Ventilation, Air Conditioning), Power Windows, Power Locks, Mirrors, Seats, Audio System
Maintenance:
Oil Change, Filter Replacements (Oil, Air, Fuel, Cabin), Spark Plug Replacement, Fluid Checks and Replenishments, Brake Pad Replacement, Belt Inspection and Replacement
Diagnostics:
Troubleshooting Common Issues, OBD-II Diagnostic Trouble Codes (DTCs), Sensor Testing, Actuator Testing, Performance Diagnosis
Repair Rebuild:
Engine Overhaul, Transmission Rebuild, Turbocharger Rebuild, Brake System Repair, Suspension Component Replacement, Electrical Component Repair
Installation Adjustment:
Timing Belt Replacement, Clutch Replacement, Suspension Geometry Adjustment, Wheel Alignment Procedures, Turbocharger Installation/Removal
Depth:
Comprehensive (from basic maintenance to full engine and transmission rebuilds, including detailed torque specifications and diagnostic procedures)
Digital Format:
PDF (Portable Document Format)
Quality:
High-resolution scans of original factory documentation, ensuring clarity of text and diagrams
Paper Type:
N/A (Digital)
Search Functionality:
Likely text-searchable PDF, allowing quick access to specific information
Navigation Features:
Bookmarked sections, clickable links within the PDF for easy navigation between topics and diagrams
Engine Type:
Horizontally Opposed (Boxer), Turbocharged, Intercooled, DOHC, 16-valve
Displacement:
2.5 Liters (2457 cc)
Bore X Stroke:
99.5 mm x 80.0 mm
Engine Management:
Subaru Engine Control Unit (ECU), Electronic Fuel Injection (EFI)
Horsepower:
300 PS (296 bhp / 221 kW) @ 6400 rpm (European/JDM spec, US spec slightly lower)
Torque:
392 Nm (289 lb-ft) @ 4400 rpm (European/JDM spec, US spec slightly lower)
Fuel Type:
Unleaded Gasoline (91 Octane or higher recommended)
Fuel Delivery:
Sequential Electronic Fuel Injection (SEFI)
Fuel Pump:
High-pressure electric fuel pump
Oil Type:
SAE 5W-30 Synthetic (Refer to manual for exact specifications and approvals)
Oil Capacity:
4.8 US quarts (4.5 liters) with filter change
Spark Plugs:
Iridium type, specific part numbers in manual (e.g., NGK PFR7B or equivalent)
Timing Belt:
Timing belt driven, replacement interval typically 105,000 miles or 7 years (refer to manual)
Coolant Type:
Subaru Super Coolant (Blue) or equivalent silicate-free ethylene glycol coolant
Transmission Type:
6-speed Manual Transmission with Driver Controlled Center Differential (DCCD)
Optional Transmission:
N/A (Only manual transmission offered for STI)
Dccd Modes:
Manual mode (driver adjustable center diff lockup) and Auto mode (ECU controlled)
Gear Ratios:
Specific ratios provided in the manual for each gear and final drive
Transmission Fluid Type:
Hypoid Gear Oil, API GL-5 (e.g., Subaru Extra-S or equivalent)
Transmission Fluid Capacity:
Approximately 3.5 liters (Manual transmission)
Rear Differential Fluid Type:
Hypoid Gear Oil, API GL-5 (e.g., Subaru Extra-S or equivalent)
Rear Differential Fluid Capacity:
Approximately 1.0 liter
NHTSA Front Impact:
5-star (as per available data for similar Subaru models of the era)
IIHS Side Impact:
Good (as per available data for similar Subaru models of the era)
ABS:
Standard, 4-wheel Anti-lock Braking System
Traction Control:
Standard Subaru Vehicle Dynamics Control (VDC) system, including traction and stability control
Brake Bias Control:
DCCD contributes to active safety by managing torque distribution
Airbags:
Driver and front passenger airbags, front side-impact airbags
Seatbelts:
3-point seatbelts with pretensioners and load limiters
Body Structure:
Advanced front and side-impact protection structure (Subaru's proprietary design)
Audio System:
Factory AM/FM/CD player, likely with 4 or 6 speakers depending on trim. Upgrade options are common.
Display:
Basic LCD display for radio and clock, no advanced navigation or touchscreen available from factory.
Cruise Control:
Standard cruise control system
Dccd:
Advanced drivetrain technology allowing driver control over the center differential, significantly impacting handling.
Auxiliary Input:
May feature an auxiliary audio input jack depending on the specific audio unit configuration.
OBD Ii Port:
Standard OBD-II diagnostic port for engine and emissions monitoring, essential for troubleshooting.
Oil Change Interval:
Every 3,750 miles or 6 months (severe conditions), or 7,500 miles or 12 months (normal conditions) - consult manual.
Air Filter Replacement:
Every 15,000 miles or 12 months
Cabin Air Filter Replacement:
Every 15,000 miles or 12 months
Brake Fluid Flush:
Every 30,000 miles or 24 months
Coolant Flush:
First at 30,000 miles or 24 months, then every 30,000 miles or 24 months thereafter
Power Steering Fluid:
Subaru recommends specific PSF or Dexron III ATF (consult manual)
Clutch Fluid:
DOT 3 Brake Fluid
Piston Slap:
Some EJ257 engines can exhibit piston slap, especially when cold, often considered normal by Subaru within tolerance.
Ringland Failure:
Can occur with aggressive tuning or sustained high boost, emphasizing the importance of proper maintenance and ECU tuning.
Clutch Wear:
High-performance nature can lead to accelerated clutch wear under aggressive driving conditions.
Turbo Charger Wear:
Requires proper warm-up and cool-down procedures; oil maintenance is critical.
Subaru Origin:
Japanese manufacturer with a strong reputation for engineering, particularly its boxer engines and Symmetrical All-Wheel Drive system.
Subaru Motorsport:
Deep roots in rallying, with the Impreza WRX STI being a homologation special directly influenced by its WRC success.
Impreza Generation:
This is the 'GDB' generation, specifically the 'hawkeye' facelift introduced for the 2006 model year.
Sti Development:
STI (Subaru Tecnica International) denotes the performance division, responsible for enhancing the Impreza's motorsport capabilities.
Production Years:
The GDB generation ran from 2002 to 2007, with the 2006 model year marking a significant refresh.
Manufacturing Plant:
Primarily manufactured in Gunma, Japan.
Motorsport Accolades:
The Impreza WRX STI lineage is a multiple-time World Rally Championship (WRC) constructor and driver's champion, influencing its performance reputation.
Performance Magazine Reviews:
Consistently praised by automotive journalists for its exhilarating performance, handling capabilities, and rally-bred character.
Enthusiast Following:
Cult following among performance car enthusiasts and motorsport fans, highly regarded for its driving dynamics and tuning potential.