2013 Ford Focus ST Long-Term Road Test

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

Most Recommended Comments

By fordson1
on 06/28/13
12:24 PM PST

I disagree, duck87. With IRS and a four-cylinder with real power, this is the car the FR-S/BRZ could have been. Yes, it will be larger and heavier than the Toyobaru, but with a reputed 200-lb. weight loss across the lineup, better weight distribution with the four than the Coyote, RWD dynamics, a modern IRS and updated front suspension, it will provide a real cross-shopping challenge. And I bet Ford doesn't put half-assed drift tires and wimpy brake pad material on it.

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By greenpony
on 06/29/13
4:24 AM PST

I don't believe I would ever buy a 4 cylinder or 6 cylinder Mustang. It's not that the engines are poor, nor that I'm opposed to driving cars with 4-6 cylinders. The problem is that my mental image of a proper Mustang has a V8 under the hood. Anything less than that, and I may as well drive something else.

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