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Subaru Boxer Engine20
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Subaru Boxer Engine
SUBARU, 1966
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Subaru introduces the company’s trademark Subaru Boxer engine.
Impreza Engines
2.5 RS and Outback Sport: 2.5-liter 4-cylinder; 165 hp,
166 lb.-ft. of torque
WRX: 2.0-liter Turbocharged 4-cylinder; 227 hp,
217 lb.-ft. of torque
WRX STi: 2.5-liter Turbocharged 4-cylinder; 300 hp,
300 lb.-ft. of torque
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UNDER THE HOOD, what sets Subaru apart is the distinctively innovative, horizontally opposed Subaru
Boxer engine. It is available in Impreza models as a powerful 300-hp intercooled and turbocharged
4-cylinder, a rally-bred 227-hp intercooled and turbocharged 4-cylinder, or a
robust 165-hp naturally aspirated 4-cylinder. Unlike conventional engine layouts, its
cylinders are aligned on a single, horizontal plane. This results in a powerplant
that is compact, lightweight and well balanced.
Now equipped with Electronic Throttle-Control
(ETC) drive-by-wire technology for more accurate
and precise response, the Subaru Boxer engine
delivers outstanding power and performance.
The compact size of
the Subaru Boxer engine
allows it to be placed
lower in the chassis,
reducing the vehicle’s
center-of-gravity for well-
balanced handling.
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IMPREZA WRX STi. Inside the ferocious Impreza WRX STi roars a sophisticated,
racing-inspired 2.5-liter Subaru Boxer engine. Its advanced block is cast of a specially
reinforced and remarkably lightweight aluminum alloy. Its molybdenum-coated pistons
help to reduce friction, while Dual Overhead Camshaft cylinder heads (DOHC) with hollow
camshafts further reduce mass for quicker engine
response. All of which is enhanced by a high-boost
turbocharger producing 14.5 psi of maximum boost,
and a large intercooler with manual driver-controlled
water-spray to help keep the compressed intake air
cool and dense, resulting in increased horsepower.
Turbocharging the Subaru Boxer engine featured in
the WRX and WRX STi allows the benefit of increased
horsepower and torque without having to increase
engine size or displacement.
Our Active Valve Control System (AVCS) found on the
WRX STi helps to deliver increased low-end power while
allowing for greater breathing at higher engine speeds.
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