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Peak boost is all relative, what matters is airflow. Boost to achieve a given airflow will vary with temperature, density, humidity, etc. This is why all OEMs tune to a normalized load instead of an absolute value of boost. So when you see the boost "only" go to 15psi on a cold day, remember...

Those prices ARE for a Fiesta ST and Focus ST. There are no options for power doors, windows, etc. This isn't the 1980's anymore.

Yes but that is a dial which will override all other request, including hardware protection.

Best way to learn is gradual accels in gear, varying pedal between runs. Or just go all out and WOT runs! :headbang:

Yep, but if you flash and run immediately, it may take several runs to fully learn. By default the system assumes 87 pump and learns up or down from there.

Remember that all pumps, with exception, are E10 fuel. Nominal AFR for E10 is 14.08. Even if you change nominal AFR the system will adapt to run stoich, its a closed loop system. Any MPG gains are speculation or before the system is learned.

Are you running the stock fuel system or adding port-fuel injectors piggy-back style? That's really the best option as the HP fuel system is extremely complex and costly to upgrade. Mountune does sell higher flow DI injectors though...

Wonder if they learned the OAR on the Cobb tunes, and purposely not on the stock tunes. I wouldn't give them that much credit though. Other possibility is that the Cobb tunes off-the-shelf modify the OAR to be higher all the time, which is BAD news for anyone running less than perfect quality...

Exactly, and the problem with the aftermarket increasing boost at high engine speeds is that loss in efficiency results in huge air charge temp increase. Especially with a stock FMIC, why you see a lot of the aftermarket tunes needing a FMIC because they are operating so inefficiently. No such...

Yes, please explain how you can buy a GT or ecoboost perf pack for $21k MSRP and get 35mpg on the highway Fiesta ST New for $18k, $21k MSRP...

Yep another poor dyno comparison by a tuner, surprised? They did not let octane adjust learn on the stock calibration. This would also explain the lower boost. Look at others stock 93 octane pulls.

I really can't comment on anything more than I've already said, so any more questions will result in the standard "no comment" response :).

Thank you for the clarification and for the front page feature. I'm glad everyone likes the photos. I'll bet everyone will be even more excited when you see the car in person. It really is a great looking car. We're doing our best to deliver the best product that truly lives up to the...