The 2018 Subaru Impreza represents a significant evolution for the compact sedan and hatchback, marrying refined efficiency with the brand's signature symmetrical all-wheel drive. Under the hood, the base models feature a refined 2.0-liter four-cylinder boxer engine, while the performance-oriented WRX variant steps up to a more assertive 2.0-liter turbocharged unit. This powertrain configuration delivers a compelling balance of everyday drivability, responsive acceleration, and confident traction in various weather conditions.
Design and Engineering Philosophy
Subaru's approach to the 2018 Impreza centers on a horizontally-opposed engine layout, commonly known as a boxer engine. This design places the pistons and cylinders lying flat on either side of the central crankshaft, resulting in a lower center of gravity. The inherent balance of the opposing pistons creates minimal vibration, allowing for a smoother idle and more composed handling. This mechanical foundation is the reason the Impreza feels planted and stable, whether navigating urban streets or winding rural roads.
Performance Specifications: The Base Engine
For the majority of the Impreza lineup, power comes from the naturally aspirated FB20 2.0-liter boxer engine. This unit generates 152 horsepower and 144 lb-ft of torque, channeled to all four wheels via the standard Symmetrical All-Wheel Drive system. The engineering focus here is on linear power delivery and exceptional fuel efficiency, making it an ideal choice for drivers prioritizing economy and reliability over outright speed. The engine integrates directly with the continuously variable transmission (CVT) to optimize fuel economy across a wide range of driving scenarios.
Performance Specifications: The WRX Turbo
Shifting attention to the WRX model reveals a completely different character. The 2018 WRX is equipped with a turbocharged version of the same 2.0-liter platform, designated the FA20F. This engine utilizes a turbocharger to force more air into the combustion chamber, boosting output to a spirited 268 horsepower and 258 lb-ft of torque. This substantial increase in power transforms the Impreza into a genuine performance hatchback, delivering brisk acceleration and a more aggressive exhaust note that appeals to driving enthusiasts seeking excitement in a practical package.
Driving Dynamics and Efficiency
The synergy between the boxer engine and Subaru's Symmetrical All-Wheel Drive is the cornerstone of the Impreza's driving dynamics. The low, centered mass of the boxer engine contributes to balanced weight distribution, enhancing cornering grip and reducing body roll. In everyday driving, the CVT transmission ensures the engine operates within its most efficient range, contributing to the model's strong fuel economy figures. Drivers can switch the CVT into a manual mode using paddle shifters, providing a more engaging experience by holding the transmission at a specific ratio for better throttle response.
Technology and Integration
Managing the power output is the Subaru Global Platform (SGP), which integrates the engine, transmission, and chassis into a cohesive system. For the 2018 model year, Subaru further refined the SGP to improve rigidity and responsiveness. This platform allows the engine's power to be transmitted with minimal loss, ensuring that driver input is translated directly into movement. The integration is so seamless that the power delivery feels immediate and natural, contributing to an intuitive and confidence-inspiring driving experience in various conditions.
Reliability and Ownership Experience
Subaru has built a reputation for producing durable and long-lasting vehicles, and the 2018 Impreza continues this tradition. The boxer engine design is inherently balanced, which reduces stress on internal components compared to vertically-oriented engines. Regular maintenance using high-quality synthetic oil is key to ensuring the longevity of the timing chain and other critical components. Owners often report high mileage with minimal major issues, making the Impreza a sound investment for those valuing longevity and lower cost of ownership over time.
