Subaru Working on 1.6- and 2.0-L Turbo Fours and Own Hybrid, Seeks 30 Percent Fuel-Economy Gain by 2015

At the Frankfurt auto show, we chatted with Subaru about its plans to drastically increase the fuel efficiency of its cars while maintaining their current levels of dynamics. The Japanese company says it wants to improve fuel economy across its lineup by 30 percent by 2015. New engines and revised transmissions will contribute to two-thirds of the increase, while lightweight body and chassis technology will provide the rest.

1.6- and 2.0-Liter Direct-Injected Turbos
Turbocharged, lower-displacement engines are today’s new hotness for achieving improved efficiency—Ford’s EcoBoost technology is the most marketed example—but for most companies, widespread turbocharging is new. Subaru, on the other hand, has extensive forced-induction experience and intends to put that knowledge to work. The new-for-2012 Impreza sedan’s new, naturally aspirated 2.0-liter flat-four is part of a new FB engine family (click here for a dive into the new engine), as is the Forester’s current 2.5-liter flat-four. While the 2.0-liter has boosted the new Impreza’s fuel-economy numbers significantly—the Forester saw only minor gains—Subaru plans to add direct injection (which we’re told nets a two-percent reduction in fuel consumption on its own) and turbocharging to the FB mix in the near future, both to the 2.0-liter and a new 1.6-liter variant.

Turbo BRZ? Maybe, but Not Yet
Ah, you’re thinking, this means a turbo version of Subaru’s sports car, the BRZ! While that hasn’t been explicitly ruled out—and we believe one is in the works—this isn’t a confirmation either. The engine in Subaru’s forthcoming coupe actually is codenamed FA, and exactly how it differs from the FB—likely only in its use of Toyota’s port- and direct-injection heads—isn’t known at this point.

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