The good news is that Subaru seems to have improved on its previous design, engineering what appears to be a more robust and capable powerplant. Only a handful of owners have been willing to push their new cars to the edge of the envelope or beyond while still under warranty. Since the FA20DIT engine is still a relatively new mill, it leaves many wondering what its strengths and weaknesses are. They are purpose-designed for competition and high-horsepower engines. JE's new pistons for the FA20 and FA20DIT lines are forged from strong, 2618 aluminum and feature a patented Perfect Skirt coating. To take further advantage of the Boxer’s inherently low center of gravity, Subaru engineers designed an equal-length exhaust manifold that feeds into a centrally-located, low-mount, twin-scroll Garrett MGT2259S turbocharger.

Direct Injection fuel delivery technology lends to improvements in both output as well as fuel efficiency. These pistons make the connection to the crankshaft by way of asymmetrical connecting rods designed to reduce friction and wear on the cylinder walls and the piston skirts during the compression stroke. Its cast aluminum pistons feature a specially designed dome intended to optimize combustion of fuel delivered by the direct injection system.

This new 2.0-liter mill features a square 86mm bore and stroke dimension that results in a balanced output of 258 lb-ft torque and 268 horsepower (per the manufacturer). This engine paved the way for its American market debut as the FA20DIT (Direct Injection Turbocharged) that later equipped the USDM 2014+ Forester 2.0XT and the 2015+ WRX. Turbocharged variants of this new engine family debuted in the JDM 2012 Subaru Legacy GT as the FA20F. The renowned low center of gravity that boxer engines are praised for has been a key element to their handling prowess through the years.įor its next generation of Boxer engine, the FA Series, Subaru made some distinct refinements to its design.

Subaru boxer long blockblock