Twin-scroll IHI VF48 turbocharger with intercooler
Redline:
7500 RPM
Horsepower Hp:
305 hp @ 6000 RPM
Torque Lb-Ft:
290 lb-ft @ 4000 RPM
Fuel System
Recommended Fuel:
Premium Unleaded Gasoline (91 AKI or higher)
Fuel Tank Capacity:
15.9 gallons (60 liters)
Fluid Requirements
Engine Oil Type:
SAE 5W-30 Synthetic
Engine Oil Capacity:
4.8 US quarts (4.5 liters) with filter
🔧 Transmission
Standard
Transmission Type:
6-speed Manual Transmission
Transmission Model:
TY856WB1CA
Clutch Type:
Hydraulic Twin-Plate Clutch
Features
Dccd:
Driver Controlled Center Differential (Auto/Manual modes).
Fluid Requirements
Transmission Fluid Type:
Subaru Extra-S Gear Oil (or equivalent API GL-5, SAE 75W-90)
Transmission Fluid Capacity:
3.0 US quarts (2.8 liters)
Front Differential Fluid Type:
API GL-5, SAE 75W-90
Rear Differential Fluid Type:
API GL-5, SAE 75W-90 (Limited Slip)
📐 Dimensions
Exterior
Length Sedan:
179.1 inches (4550 mm)
Length Hatchback:
173.8 inches (4415 mm)
Width:
70.1 inches (1780 mm)
Height Sedan:
57.7 inches (1465 mm)
Height Hatchback:
58.1 inches (1475 mm)
Wheelbase:
103.0 inches (2615 mm)
Front Track:
59.8 inches (1520 mm)
Rear Track:
59.8 inches (1520 mm)
Ground Clearance:
5.0 inches (127 mm)
Weights
Curb Weight Sedan:
3417 lbs (1550 kg)
Curb Weight Hatchback:
3373 lbs (1530 kg)
Cargo
Cargo Volume Sedan:
11.3 cubic feet (320 liters)
Cargo Volume Hatchback:
19.0 cubic feet (538 liters) (seats up)
Wheels Tires
Standard Wheel Size:
18 x 8.5 inch alloy
Optional Wheel Size:
18 x 8.5 inch BBS forged alloy
Standard Tire Size:
245/40R18
Bolt Pattern:
5x100 mm
Center Bore:
56.1 mm
🛡️ Safety Features
Ratings
NHTSA Front Impact:
5-Star
NHTSA Side Impact:
5-Star
IIHS Front Crash:
Good
IIHS Side Impact:
Good
IIHS Roof Strength:
Good
Active Features
ABS:
Anti-lock Braking System (ABS)
Ebd:
Electronic Brake-force Distribution (EBD)
Brake Assist:
Brake Assist (BA)
Traction Control:
Traction Control System (TCS)
Stability Control:
Vehicle Dynamics Control (VDC)
Passive Features
Airbags:
Front dual-stage airbags, front side-impact airbags, front and rear side-curtain airbags.
Seatbelts:
3-point ELR front seat belts with pretensioners and force limiters, 3-point ELR rear seat belts.
Child Anchors:
LATCH (Lower Anchors and Tethers for Children) system.
💡 Technology Features
Infotainment
Audio System:
Standard premium audio system with CD player, auxiliary input. Optional SiriusXM Satellite Radio.
Display:
Multi-function display in instrument cluster for trip computer, AWD system status, etc.
Driver Assistance
Cruise Control:
Standard cruise control.
Limited Electronic Aids:
Relatively basic electronic driver aids compared to modern vehicles, focusing on mechanical grip and AWD performance.
Connectivity
Aux Input:
Standard auxiliary audio input jack.
Bluetooth:
Not available as standard for this model year; aftermarket solutions are common.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Every 3,750 miles or 3.75 months (severe driving) / 7,500 miles or 7.5 months (normal driving). Refer to manual for specifics. Subaru often recommends shorter intervals for performance models.
Engine Air Filter:
Inspect every 15,000 miles, replace as needed. Replace every 30,000 miles.
Cabin Air Filter:
Replace every 15,000 miles or 15 months.
Spark Plugs:
Replace every 60,000 miles (Iridium type).
Brake Fluid:
Replace every 30,000 miles or 30 months. Crucial for performance driving.
Transmission Fluid Manual:
Replace every 30,000 miles or 30 months. Subaru recommends fluid changes more frequently for enthusiasts.
Differential Fluid:
Replace every 30,000 miles or 30 months.
Fluid Specifications
Coolant:
Subaru Super Coolant (Blue) or equivalent P-HOAT type.
Power Steering Fluid:
Subaru Genuine Power Steering Fluid or Dexron III/Mercon ATF.
Brake Fluid Spec:
DOT 3 or DOT 4.
Known Issues
Piston Ring Land Failure:
A known issue with the EJ257 engine, particularly in earlier models and when modified without proper tuning, can lead to ring land damage, resulting in loss of compression and oil consumption.
Clutch Wear:
High-performance driving can lead to accelerated clutch wear. The twin-plate clutch is robust but susceptible to abuse.
Catalytic Converter:
Can be prone to failure due to heat and exhaust stresses, especially if the engine runs rich or is modified.
Suspension Bushings:
Worn suspension bushings, especially in the control arms, can lead to sloppy handling and noise.
Maintenance Tips
Engine Break In:
Proper engine break-in procedure is crucial for EJ257 longevity. The manual will detail this.
Tuning Considerations:
Engine modifications and tuning require careful attention to fuel delivery, ignition timing, and cooling to prevent catastrophic engine failure.
📚 Vehicle History
Brand Heritage
Subaru Rally Heritage:
Subaru's extensive history and success in the World Rally Championship (WRC) heavily influenced the WRX and STI models, fostering their performance image.
Model Evolution
Third Gen Impreza Platform:
The 2009 model year marked a significant redesign, moving to the third generation (GE/GH/GR/GV) Impreza platform, featuring a new chassis and a controversial shift to a more conventional compact car design (especially the hatchback) compared to the previous generation's rally-bred aesthetic.
Sti Development:
The STI variant continued to be Subaru's halo performance model, featuring the EJ257 engine, upgraded suspension, brakes, and the DCCD system, differentiating it from the standard WRX.
Production
Production Location:
Ōta, Gunma, Japan (Subaru's main manufacturing facility)
Production Years For Model:
The third generation Impreza (including WRX and WRX STI) was produced from model year 2008 to 2014.
🏆 Awards & Recognition
Recognitions
Sport Compact Awards:
The Impreza WRX STI consistently received accolades from automotive publications and enthusiasts for its performance, handling, and rally-inspired capabilities.
Handling Praise:
Praised for its exceptional grip and agility due to the Symmetrical AWD and DCCD system.
Certifications
Emission Standards:
Meets EPA and CARB emission standards for its model year (specifics vary by region).
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