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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
afr bank 1 showing 0 at times
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<blockquote data-quote="Bluegoat06" data-source="post: 14793974" data-attributes="member: 39491"><p>You do not need to worry about measured AFR at part throttle, at part throttle close loop is keeping the fueling at stoich for the most part, (lambda=1), you want to look closely into long term fuel trims, they should be around +-2% or +-3%, for idle/part throttle when tuned, you can see 6-8% out of a bone stock car, something I didn't know because about this Coyotes is that Ford runs this vehicles in permanent close loop state (as opposed to what I know from GM and LSx engines where the PCM will switch to open loop at WOT), so you can observe your fuel trims on a say 3rd gear run, as long as your fuel trims are 0 or slight negative at WOT, you are more than fine, you don't want + LTFT's at WOT, lambda at WOT should change to 0.82-0.83 tops for max power in this platform.</p></blockquote><p></p>
[QUOTE="Bluegoat06, post: 14793974, member: 39491"] You do not need to worry about measured AFR at part throttle, at part throttle close loop is keeping the fueling at stoich for the most part, (lambda=1), you want to look closely into long term fuel trims, they should be around +-2% or +-3%, for idle/part throttle when tuned, you can see 6-8% out of a bone stock car, something I didn't know because about this Coyotes is that Ford runs this vehicles in permanent close loop state (as opposed to what I know from GM and LSx engines where the PCM will switch to open loop at WOT), so you can observe your fuel trims on a say 3rd gear run, as long as your fuel trims are 0 or slight negative at WOT, you are more than fine, you don't want + LTFT's at WOT, lambda at WOT should change to 0.82-0.83 tops for max power in this platform. [/QUOTE]
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afr bank 1 showing 0 at times
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