Positioning:
The 2011 Subaru Impreza WRX STI represents the pinnacle of Subaru's rally-bred performance sedans, offering a highly capable all-wheel-drive system and a potent turbocharged engine for enthusiasts seeking track-day performance and spirited driving.
Competitors:
Competes with performance-oriented compact sports sedans such as the Mitsubishi Lancer Evolution, Volkswagen Golf GTI, and Ford Focus RS.
Performance Focus:
Symmetrical All-Wheel Drive, Subaru's Driver-Controlled Center Differential (DCCD), Multi-Mode Driver Controlled Center Differential (MTS), Brembo brakes, performance-tuned suspension.
Engine Technology:
Intercooled turbocharger, Subaru's patented equal-length exhaust headers, Boxer engine layout for lower center of gravity.
Engine:
2.5L EJ257 Turbocharged Boxer Engine: Diagnostics, repair, overhaul, timing belt, cooling, lubrication, fuel delivery, emissions.
Transmission:
6-Speed Manual Transmission (TY856): Drivetrain, clutch, gearbox overhaul, differential service, AWD system.
Brakes:
Brake System: ABS, EBD, brake calipers (Brembo front/rear), pads, rotors, hydraulic lines, parking brake.
Suspension:
Suspension System: Front MacPherson struts, rear double wishbone, springs, dampers, anti-roll bars, alignment specifications.
Steering:
Steering System: Power steering pump, rack and pinion, steering column, alignment.
Electrical:
Electrical System: Wiring diagrams, fuses, relays, battery, alternator, starter, lighting, ignition system, ECU.
Body:
Body & Chassis: Body panels, doors, hood, trunk, interior trim, structural components, crash safety.
HVAC:
HVAC System: Air conditioning, heating, ventilation, climate control diagnostics and repair.
Infotainment:
Audio System: Speaker replacement, head unit troubleshooting.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, spark plug replacement.
Diagnostics:
Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based diagnostics.
Repair:
Engine rebuilds, transmission overhaul, brake caliper replacement, suspension component renewal, electrical component repair.
Installation:
Component installation, torque specifications for all fasteners.
Specifications:
Detailed technical specifications for all components and systems.
Depth:
Deep mechanical and electrical repair, including engine and transmission rebuilds, full system diagnostics, and component-level troubleshooting.
Engine Type:
2.5-liter DOHC turbocharged flat-four (Boxer)
Horsepower:
305 hp @ 6000 rpm
Torque:
290 lb-ft @ 4000 rpm
Fuel Delivery:
Sequential multi-port fuel injection
Fuel Type:
Premium Unleaded Gasoline (91 octane or higher recommended)
ECU Type:
Engine Control Unit (ECU) with programmable parameters for performance tuning.
Radiator Capacity Liters:
8.7 L
Oil Capacity Liters With Filter:
4.8 L (5.1 US qt)
Transmission Type:
6-Speed Manual Transmission
Optional Transmission:
N/A (Only manual transmission offered)
Drivetrain:
Symmetrical All-Wheel Drive with Driver-Controlled Center Differential (DCCD) and Multi-Mode (MTS).
Manual Transmission Fluid Type:
Subaru Extra-S GL5 75W-90 Gear Oil (or equivalent)
Differential Fluid Specifications
Front Differential Fluid Type:
Subaru Extra-S GL5 75W-90 Gear Oil (or equivalent)
Rear Differential Fluid Type:
Subaru Extra-S GL5 75W-90 Gear Oil (or equivalent)
NHTSA Front Impact Rating:
5-Star
NHTSA Side Impact Rating:
5-Star
IIHS Top Safety Pick:
Yes
Traction Control:
Standard
Electronic Stability Control:
Standard
Antilock Brakes:
Standard (Brembo) with EBD
Airbags:
Front airbags, front side-impact airbags, front and rear side-curtain airbags.
Seatbelts:
Three-point seatbelts with pretensioners and load limiters.
Body Structure:
Ring-shaped reinforcement frame for enhanced crashworthiness.
Audio System:
Standard AM/FM/CD stereo with MP3 capability and 6 speakers. Optional premium audio system available.
Display:
Multi-function display for trip computer, fuel economy, and system warnings.
Cruise Control:
Standard electronic cruise control.
Auxiliary Input:
Standard 3.5mm auxiliary audio input jack.
Oil Change Interval Miles:
Every 3,750 miles or 6 months, whichever comes first (under severe driving conditions or performance use).
Engine Oil Filter Replacement:
With every oil change.
Air Filter Replacement:
Every 15,000 miles or 12 months.
Cabin Air Filter Replacement:
Every 15,000 miles or 12 months.
Spark Plug Replacement:
Every 30,000 miles (NGK iridium type recommended).
Timing Belt Replacement:
Refer to manual; typically 105,000 miles or 105 months, inspect regularly.
Coolant Type:
Subaru Super Coolant (Blue) or equivalent silicate-free, long-life coolant.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Engine Knock Or Detonation:
Common issue in EJ257 engines if not properly maintained or if using low-octane fuel. Manual covers diagnostics and prevention.
Clutch Wear:
Can be accelerated by aggressive driving. Manual provides clutch replacement procedures and torque specs.
Turbocharger Issues:
Potential for turbo failure due to oil starvation or heat; manual details lubrication and turbo system checks.