The Subaru Impreza 2009 represents a pivotal moment in the model's evolution, sitting squarely within the second generation's production run. This specific year offers a compelling blend of refined engineering and proven reliability, making it a focal point for buyers looking into the used market. Understanding the nuances of the 2009 powertrain is essential for anyone considering this compact car, whether for daily commuting or spirited weekend drives.
The Heart of the 2009 Model: Engine Options Overview
Subariu continued its strategy of offering distinct engine choices to cater to different driver priorities in 2009. The lineup was primarily split between a base model focused on efficiency and the performance-oriented variants that defined the WRX and STI trims. Each engine utilized Subaru's signature horizontally-opposed "Boxer" design, which lowers the center of gravity and contributes to the vehicle's balanced handling. This fundamental architecture remained consistent across the year, ensuring the core driving dynamics were preserved.
Standard Powerplant: The EJ253
The most common engine found under the hood of a 2009 Impreza was the EJ253, a 2.5-liter naturally aspirated Boxer engine. This unit was the workhorse for the base and premium trims, delivering a blend of everyday usability and adequate power. It generated 173 horsepower and 174 lb-ft of torque, providing smooth acceleration for city streets and confident passing on highways. The EJ253 was known for its durability and relatively low cost of ownership, which contributed significantly to the model's popularity.
Performance Segment: The WRX and STI Engines
For drivers seeking enhanced performance, the 2009 model year featured the turbocharged variants. The Subaru Impreza WRX utilized a modified EJ257 engine, while the top-tier STI employed the more robust EJ258. Both were turbocharged and intercooled, pushing output to 300 horsepower for the STI and 266 horsepower for the WRX. These engines were mated to a sophisticated symmetrical all-wheel-drive system, which distributed power to all four wheels for exceptional traction in various driving conditions. The STI's engine, in particular, was celebrated for its aggressive throttle response and capability to handle high levels of boost pressure.
Drivetrain and Efficiency Considerations
Power delivery is only one part of the equation; how that power is transmitted is equally important. The standard configuration for all 2009 Imprezas was Subaru's symmetrical all-wheel drive. This system provided a significant advantage in wet or snowy weather, improving stability and control. Transmission options varied by trim, with a standard five-speed manual available across the lineup and an optional four-speed automatic for the base model. Drivers of the WRX and STI models benefited from a more advanced five-speed manual or a Lineartronic continuously variable transmission (CVT) in the WRX, which optimized power delivery for both performance and fuel economy.
Fuel efficiency for the 2009 model year reflected the compromise between performance and practicality. The base EJ253 engine, when paired with the manual transmission and driven conservatively, could achieve an EPA-estimated range of around 20 city / 30 highway MPG. The turbocharged models, while offering more excitement, typically saw lower averages in the 18 city / 25 highway MPG range due to the nature of their performance tuning. These figures were competitive within the compact sports car segment at the time of its release.
