What To Expect From the 2015 Ecoboost Mustang - 2013 Ford Focus ST Long-Term Road Test
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2013 Ford Focus ST Long-Term Road Test

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2013 Ford Focus ST: What To Expect From the 2015 Ecoboost Mustang

June 28, 2013

2013 Ford Focus ST

It's well-known that the 2015 Ford Mustang will have a turbocharged four-cylinder Ecoboost engine. In fact, I first reported on it back in September of 2011.

Those of you thinking the 2015 Mustang's Ecoboost engine will simply take the 2013 Ford Focus ST's engine, turn it ninety degrees and overbore it are mistaken. Here are some more details on the 'Stang's four-banger ("four-'Stanger?") recently overheard from inside sources.

The 2.3-liter Ecoboost four in the Mustang will generate in the neighborhood of 330 horsepower, plus or minus a few. It will slot above the base V6 and beneath the V8 in the Mustang's pecking order (e.g., price). As its peak power number will not be drastically higher than the V6's current 305 hp, the four-cylinder's worth will likely be in a larger, broader torque output and better fuel economy than the V6.

Interestingly enough, the 2.3 Ecoboost's unique head casting integrates the exhaust manifold into the head, so the turbo simply bolts directly to a flange on the head. Though this type of manifold integration is in production on other cars, this will be the first time it has been accomplished with a twin scroll turbo, which by design groups the exhaust ports of cylinders #1 and #4 together, isolated from those of cylinders #2 and #3. That's one tricky head to cast, I bet!

Jason Kavanagh, Engineering Editor

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