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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Onboard AF ratio vs datalog fuel trims
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<blockquote data-quote="AKDMB" data-source="post: 15368719" data-attributes="member: 162770"><p>Well, the dash goes off a 14.08 stoich AFAIK. The tune most definitely goes off a 14.08 stoich. 14.7 is for pure gas, we have e10 nationwide though. Look at measured lambda not, air fuel ratio, these cars work with lambda not air fuel ratio. You are never sure of the ethanol blend in your tank, could be e10, could be e15, e5, etc. you never know. Use lambda, it doesn't matter the stoich of the fuel. Datalog measured lambda and lambse. Lambse is commanded lambda, this will tell you what your tuner is shooting for. Most tuners seem to shoot for anywhere from .83 to .86 lambda. Most would shoot for the richer side I would say. 11.4 is indeed rich, going off a 14.08 stoich that would mean your tuner is commanding .81 lambda roughly. A fuel trim of .98 means the car is pulling 2% fuel to get to commanded lambda, just fine, 2% is dead on nuts. After confirming measured lambda is indeed this rich, you can consult your tuner and ask why the tune is so rich.</p></blockquote><p></p>
[QUOTE="AKDMB, post: 15368719, member: 162770"] Well, the dash goes off a 14.08 stoich AFAIK. The tune most definitely goes off a 14.08 stoich. 14.7 is for pure gas, we have e10 nationwide though. Look at measured lambda not, air fuel ratio, these cars work with lambda not air fuel ratio. You are never sure of the ethanol blend in your tank, could be e10, could be e15, e5, etc. you never know. Use lambda, it doesn't matter the stoich of the fuel. Datalog measured lambda and lambse. Lambse is commanded lambda, this will tell you what your tuner is shooting for. Most tuners seem to shoot for anywhere from .83 to .86 lambda. Most would shoot for the richer side I would say. 11.4 is indeed rich, going off a 14.08 stoich that would mean your tuner is commanding .81 lambda roughly. A fuel trim of .98 means the car is pulling 2% fuel to get to commanded lambda, just fine, 2% is dead on nuts. After confirming measured lambda is indeed this rich, you can consult your tuner and ask why the tune is so rich. [/QUOTE]
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2011-2014 Mustangs
Engine/Tuning
Onboard AF ratio vs datalog fuel trims
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