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Old 12-01-2014, 12:37 PM   #9 (permalink)
ever_green
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Join Date: May 2011
Location: Toronto
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gueff - '19 Mercedes Benz A250 4MATIC AMG
90 day: 30.55 mpg (US)
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Quote:
Originally Posted by serialk11r View Post
Since you already have ECU access, why don't you get a narrowband O2 simulator, a wideband sensor, and have the ECU run in closed loop at 18:1, and make it go way "rich" as the load goes up? If it stumbles set it to 17:1 instead.

The drawback with this is that it might start having problems idling.
i already have all those. The ECU it self is programmed in a way that it does not recognize values above 14.7:1 AFR. so if you define a value above 14.7:1 it will just ignore and do what it 'thinks' is best. usually 14.7:1.

in any case, I tihnk 16.7-17:1 is too lean? From books and online resource I see 15.5-16:1 being quote as best figures for economy:




even still i feel no difference in power at 17:1 vs 15:1 stock. throttle feels the same.
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