The "Learning ECU" has been out sense 1999 that doesnt mean it will make wide open fuel adjustments , the WOT fueling up to 2012 has been a set fuel map for open loop
The 2012 can to a point see and make SMALL fuel adjustments to the WOT fueling from the imformation from the o2 sensor , if this works so well why am I seeing 2012 Foci running in the lean side , these are part of the Fuel corrections not the "learning" part of the ECU , and this WOT target is borderline lean its ment for the ALL STOCK engine not A/F ment an engine moving more air and building for performance , Keep in mind ford does the ECU tuning for STOCK not performance
There are things that are going to need to be turned off in the ECU and a lot of things changed as you mod the Focus , simple air fuel gauge instlled or on a dyno will tell you if your safe with the A/F , then there is still the timing which is aggressive for this compression and 91 fuel
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