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Focus ST EcoBoost Performance (2013-Current) The place to chat about the 2.0L EcoBoost engine performance, tuning and exhaust related upgrades.

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Old 01-04-2013, 09:06 PM   #11
enginjoe
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Join Date: Nov 2012
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Location: Tucson, AZ
What I Drive: 2012 Focus Titanium

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Society of automotive engineers? My kind of people.

Here's a powerpoint presentation of the paper (nice pictures and bullet with main points without being too technical). This is good stuff.

https://docs.google.com/viewer?a=v&q...TIHGjoUNVgIU8A

I decided to add clifFor Sale:

They added port fuel injected gas to a DI high compression motor (one example was the v6 ecoboost with higher compression) to try and get better use of the E85 by only using it in a direct injection way to suppress knock (keep temps lower).

So...basically for idle and cruise you use mainly gas, and when cylinder pressures rise (you have your foot in it), you use the E85. This way you get good economy and lower emissions. Sounds kinda complicated though with two fuel systems.

Interesting tidbits are the quoted octane numbers for ethanol and the fact that they are getting closer to a possibility of a high compression FI motor that would have similar fuel economy to a lower compression regular gas only motor.
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