Let's dive deep into the 2005 Subaru Impreza WRX STI, a car that's become a legend in the rally and performance car world. If you're a car enthusiast, especially a fan of Subaru, you've probably heard about this iconic model. The 2005 WRX STI is celebrated for its impressive performance, distinctive styling, and the raw driving experience it offers. Whether you're considering buying one, restoring one, or just want to learn more, this article covers all the essential specs and performance details.

Overview of the 2005 Subaru Impreza WRX STI

The 2005 Subaru Impreza WRX STI isn't just another car; it's a statement. It represents a blend of Subaru's rally heritage and their commitment to high-performance vehicles. This model year is particularly significant because it captures the essence of what made the WRX STI so desirable: a potent engine, advanced drivetrain, and aggressive styling. For many, the 2005 model hits the sweet spot in terms of design and performance, making it a sought-after classic.

Key Features

• Engine: 2.5-liter turbocharged boxer engine
• Drivetrain: Symmetrical All-Wheel Drive (AWD)
• Transmission: 6-speed manual
• Styling: Distinctive hood scoop, rear wing, and sporty body kit
• Interior: Sport seats, STI badging, and driver-focused layout

Engine Specifications

The heart of the 2005 Subaru Impreza WRX STI is its engine – a 2.5-liter turbocharged boxer engine. This engine is renowned for its robust power delivery and distinctive rumble. Let's break down the specifics:

Engine Type

• Type: 2.5-liter, horizontally opposed (boxer), turbocharged and intercooled
• Code: EJ257

The EJ257 engine is a masterpiece of engineering. The boxer configuration, with its horizontally opposed cylinders, provides a low center of gravity, enhancing the car's handling and stability. The turbocharger forces more air into the engine, significantly boosting power output.

Horsepower and Torque

• Horsepower: 300 hp at 6,000 rpm
• Torque: 300 lb-ft at 4,000 rpm

The power figures of the 2005 WRX STI are impressive, even by today's standards. The 300 horsepower and 300 lb-ft of torque provide exhilarating acceleration and responsive performance across a wide range of driving conditions. The relatively low rpm at which peak torque is achieved means the car feels strong and pulls hard from almost any speed.

Turbocharger

• Type: Single, twin-scroll turbocharger
• Location: Mounted close to the engine for quick response

The twin-scroll turbocharger is a key component in delivering the engine's impressive performance. This design helps to reduce turbo lag, providing quicker boost response and improved throttle response. The placement of the turbocharger close to the engine also minimizes exhaust gas travel, further enhancing responsiveness.

Fuel System

• Fuel Injection: Multi-point fuel injection
• Fuel Type: Premium unleaded gasoline (91 octane or higher recommended)

The multi-point fuel injection system ensures precise fuel delivery to each cylinder, optimizing combustion efficiency and power output. Using premium unleaded gasoline is crucial to prevent knocking and ensure the engine performs at its best.

Drivetrain and Transmission

The 2005 Subaru Impreza WRX STI features Subaru's legendary Symmetrical All-Wheel Drive (AWD) system. This, combined with its robust 6-speed manual transmission, makes it a joy to drive.

Symmetrical All-Wheel Drive (AWD)

• Type: Full-time Symmetrical AWD
• Center Differential: Driver-Controlled Center Differential (DCCD)

The Symmetrical AWD system is at the heart of the WRX STI's superior handling and traction. Unlike some other AWD systems, Subaru's is always engaged, providing consistent power distribution to all four wheels. The Driver-Controlled Center Differential (DCCD) allows the driver to adjust the torque split between the front and rear wheels, optimizing the car's handling characteristics for different driving conditions.

Transmission

• Type: 6-speed manual
• Gear Ratios: Specifically tuned for performance

The 6-speed manual transmission is designed to handle the engine's high power output. The gear ratios are carefully chosen to provide quick acceleration and optimal performance on both the street and the track. The short-throw shifter adds to the engaging driving experience.

Differential

• Front Differential: Helical limited-slip differential
• Rear Differential: Torsen limited-slip differential

The front and rear limited-slip differentials help to distribute torque to the wheels with the most grip, further enhancing traction and handling. These differentials are crucial for maintaining stability and control, especially when driving aggressively.

Suspension and Brakes

To handle the 2005 WRX STI's power, Subaru equipped it with a sophisticated suspension and braking system.

Suspension

• Front Suspension: Inverted struts with coil springs
• Rear Suspension: Inverted struts with coil springs
• Stabilizer Bars: Front and rear stabilizer bars

The inverted strut design provides increased rigidity and improved handling. The front and rear stabilizer bars help to reduce body roll during cornering, enhancing stability and control. The suspension is tuned to provide a balance between performance and comfort, making the car enjoyable to drive on a variety of road surfaces.

Brakes

• Type: Brembo high-performance brakes
• Front Brakes: 4-piston calipers with ventilated discs
• Rear Brakes: 2-piston calipers with ventilated discs

The Brembo brakes are a key feature of the WRX STI, providing exceptional stopping power and resistance to brake fade. The 4-piston front calipers and 2-piston rear calipers ensure consistent and reliable braking performance, even under hard use. The ventilated discs help to dissipate heat, preventing brake fade during extended periods of aggressive driving.

Exterior and Interior

The 2005 Subaru Impreza WRX STI is instantly recognizable thanks to its aggressive styling cues and sporty interior.

Exterior

• Body Style: Sedan
• Hood Scoop: Functional hood scoop for intercooler
• Rear Wing: Large rear wing for improved aerodynamics
• Wheels: 17-inch BBS alloy wheels

The hood scoop is not just for looks; it directs air to the intercooler, helping to keep the intake air temperature down and maintain consistent performance. The large rear wing provides added downforce, improving stability at high speeds. The 17-inch BBS alloy wheels are lightweight and strong, contributing to the car's overall performance.

Interior

• Seats: Sport seats with STI logo
• Steering Wheel: Leather-wrapped steering wheel
• Gauges: STI-specific gauges
• Pedals: Aluminum alloy pedals

The sport seats provide excellent support and comfort, keeping the driver and passenger securely in place during spirited driving. The leather-wrapped steering wheel feels great in the hands and provides precise steering feedback. The STI-specific gauges provide important information about the car's performance, such as boost pressure and oil temperature. The aluminum alloy pedals add a sporty touch and improve grip.

Performance Stats

Let's look at some key performance statistics for the 2005 Subaru Impreza WRX STI:

Acceleration

• 0-60 mph: Approximately 4.8 seconds

Quarter Mile

• Quarter Mile Time: Approximately 13.5 seconds

These figures demonstrate the impressive performance capabilities of the WRX STI. The quick acceleration and fast quarter-mile times make it a formidable competitor on the street and the track.

Reliability and Maintenance

Like any high-performance vehicle, the 2005 Subaru Impreza WRX STI requires regular maintenance to keep it running at its best. Some common maintenance items include:

Regular Maintenance

• Oil Changes: Every 3,000-5,000 miles
• Spark Plugs: Replace every 30,000 miles
• Timing Belt: Replace every 60,000 miles
• Brake Pads and Rotors: As needed

Common Issues

• Turbocharger Problems: Can occur due to high stress
• Head Gasket Failures: A known issue with EJ257 engines
• Oil Consumption: Some engines may consume oil

Market Value and Collectibility

The 2005 Subaru Impreza WRX STI has become a collectible car, with prices varying depending on condition, mileage, and modifications. A well-maintained, original example can command a premium price.

Factors Affecting Value

• Condition: Excellent condition examples are highly sought after
• Mileage: Lower mileage cars are generally worth more
• Modifications: Original, unmolested cars tend to be more valuable
• History: Cars with a clean title and documented maintenance history are preferred

Conclusion

The 2005 Subaru Impreza WRX STI is a true icon of the performance car world. Its potent engine, advanced drivetrain, and aggressive styling make it a joy to drive and own. Whether you're a long-time Subaru enthusiast or new to the brand, the 2005 WRX STI offers an exhilarating driving experience that's hard to match. Understanding its specs and performance characteristics is key to appreciating what makes this car so special.