Segment:
Performance Compact Sedan/Wagon
Description:
The 2007 WRX STI represented the pinnacle of Subaru's rally-bred performance offerings for the Impreza line, known for its potent turbocharged engine, advanced all-wheel-drive system, and driver-focused dynamics.
Key Competitors:
Mitsubishi Lancer Evolution, Honda Civic Si, Volkswagen GTI
Performance Focus:
Emphasis on turbocharged engine power, precise handling, and all-weather capability.
Rally Heritage:
Direct lineage from Subaru's dominant World Rally Championship (WRC) program.
AWD System:
Advanced Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD).
Powertrain:
Engine (EJ257), Transmission (6-speed manual), Drivetrain (Symmetrical AWD)
Chassis:
Suspension, Steering, Brakes, Wheels, Tires
Electrical:
Wiring Diagrams, ECU, Lighting, Audio, Accessories, Immobilizer
Body:
Body Panels, Interior Trim, Seating, Glass, Doors, Bumpers
Comfort And Climate:
HVAC System, Climate Control
Maintenance:
Oil Changes, Filter Replacements, Spark Plug Service, Fluid Flushes
Troubleshooting:
Diagnostic Codes (DTCs), Symptom-based Diagnostics, Electrical Fault Finding
Repair:
Engine Overhaul, Transmission Rebuild, Brake Component Replacement, Suspension Overhaul
Adjustment:
Wheel Alignment, Clutch Adjustment, Handbrake Adjustment
Installation:
Component Replacement, Accessory Installation
Depth:
Comprehensive, covering routine maintenance to full engine and transmission rebuilds
Diagnostic Level:
Advanced diagnostic procedures, including ECU scanning and electrical system analysis
Specifications:
Detailed torque specifications, clearances, fluid capacities, and resistance values
Engine Type:
2.5L Boxer Turbocharged DOHC 16-Valve
Horsepower:
305 hp @ 6000 rpm (approx.)
Torque:
290 lb-ft @ 4000 rpm (approx.)
Fuel Delivery:
Sequential Electronic Fuel Injection (SEFI)
Fuel Type:
Premium Unleaded Gasoline (91 octane or higher recommended)
Coolant Capacity:
7.1 Liters (7.5 US Quarts)
Oil Capacity:
4.8 Liters (5.1 US Quarts) with filter
Transmission Type:
6-speed Manual
Optional Transmissions:
None (Manual Only for STI)
Dccd:
Driver Controlled Center Differential (manual operation)
Manual Transmission Fluid:
Subaru Extra S Manual Transmission Fluid (or equivalent)
Manual Transmission Capacity:
2.5 Liters (2.6 US Quarts)
NHTSA Front Impact:
Not Rated
ABS:
Yes (4-wheel anti-lock braking system)
Traction Control:
Yes (Subaru Vehicle Dynamics Control - VDC)
Airbags:
Driver and Front Passenger Airbags, Side Curtain Airbags (optional/specific trims)
Seatbelts:
3-point front and rear seatbelts with pretensioners
Frame Construction:
Reinforced chassis with crumple zones
Head Unit:
Factory AM/FM/CD Player with optional subwoofer
Display:
Digital clock and basic information display
Stability Control:
Subaru Vehicle Dynamics Control (VDC)
AWD System:
Symmetrical All-Wheel Drive with Driver Controlled Center Differential (DCCD)
Auxiliary Input:
Optional (check specific vehicle)
Instrumentation:
Tachometer, Speedometer, Boost Gauge, Oil Pressure Gauge, Ancillary Gauges
Oil Change Interval:
Every 3,750 miles or 6 months (severe driving conditions recommend more frequent changes)
Spark Plug Replacement:
Refer to manual, typically around 30,000 - 60,000 miles depending on type.
Timing Belt Replacement:
Not Applicable (EJ257 uses a timing chain or rubber belt, check manual for specific interval)
Engine Oil Type:
SAE 0W-30 or 5W-30 Synthetic (API SG, SH, SJ, SL, or SM)
Coolant Type:
Subaru Super Coolant (Blue) or equivalent
Brake Fluid Type:
DOT 3 or DOT 4
Head Gasket Failures:
While less common on the EJ257 than some earlier EJ25 variants, head gasket issues can still occur due to high thermal stress.
Ring Land Cracking:
Potential for piston ring land cracking under extreme detonation or sustained high boost.
Clutch Wear:
High-performance nature and repeated hard launches can lead to accelerated clutch wear.
Turbo Charger Issues:
Oil starvation or contamination can lead to premature turbo failure (IHI VF39).
Oil Filter Part Number:
Subaru 15208AA031 (or equivalent such as FRAM PH7317, WIX 57356)
Rally Success:
Subaru's long and successful history in the World Rally Championship (WRC) heavily influenced the WRX STI models.
Generation:
Third Generation Impreza (GE/GH/GR/GV) - This model year marks the transition to the GD chassis for the STI.
Key Changes From Previous:
Increased horsepower, revised DCCD system, wider track, improved aerodynamics, updated interior.
Manufacturing Location:
Japan
Production Years:
2000-2007 (GD chassis for WRX STI)
Performance Awards:
Frequently cited by automotive journalists for its rally-inspired performance and handling.
Road And Track:
Often lauded in performance benchmarks and comparisons by publications like Road & Track.
Emissions Standards:
Meets applicable emissions standards for its model year (e.g., EPA, CARB where applicable).
