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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
TVS Tuning - Short term fuel trims / AFR
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<blockquote data-quote="mastwolf" data-source="post: 14075532" data-attributes="member: 26424"><p>The PCM does everything in Lambda once it knows the stoich value of the fuel (pump gas ~ 14.08)</p><p></p><p>The PCM will always try and target lambda 1.0 aka 14.08 a/f (but lets forget air to fuel ratios...they suck) unless certain conditions are met to go into WOT tables usauly RPM and Throttle %</p><p></p><p>The Desired Lambda at WOT tables are even in Lambda</p><p>[ATTACH]12075[/ATTACH]</p><p></p><p>So when it is using your maf table that is tuned for your application</p><p>[ATTACH]12076[/ATTACH]</p><p></p><p>And the end result is <span style="color: #FF0000"><strong>not</strong></span> what is in the WOT tables, the pcm being a closed loop system uses Short Term Fuel Trims to Trim the fuel to the correct Lambda that is commanded (WOT or light load). There will always be some sort of STFT going on as long as the PCM is in closed loop mode (monitoring the wideband 02 sensors).</p><p></p><p>With that being said... .85 is pretty far out to lunch....by my standards...and most all other reputable tuners. Try to data log Long Term Fuel Trims, they will show things such as vacuum leaks, and if you have LTFT issues AND STFT you have some issues at hand.</p></blockquote><p></p>
[QUOTE="mastwolf, post: 14075532, member: 26424"] The PCM does everything in Lambda once it knows the stoich value of the fuel (pump gas ~ 14.08) The PCM will always try and target lambda 1.0 aka 14.08 a/f (but lets forget air to fuel ratios...they suck) unless certain conditions are met to go into WOT tables usauly RPM and Throttle % The Desired Lambda at WOT tables are even in Lambda [ATTACH]12075.vB[/ATTACH] So when it is using your maf table that is tuned for your application [ATTACH]12076.vB[/ATTACH] And the end result is [COLOR="#FF0000"][B]not[/B][/COLOR] what is in the WOT tables, the pcm being a closed loop system uses Short Term Fuel Trims to Trim the fuel to the correct Lambda that is commanded (WOT or light load). There will always be some sort of STFT going on as long as the PCM is in closed loop mode (monitoring the wideband 02 sensors). With that being said... .85 is pretty far out to lunch....by my standards...and most all other reputable tuners. Try to data log Long Term Fuel Trims, they will show things such as vacuum leaks, and if you have LTFT issues AND STFT you have some issues at hand. [/QUOTE]
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Engine/Tuning
TVS Tuning - Short term fuel trims / AFR
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