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2011-2014 Mustangs
Engine/Tuning
afr bank 1 showing 0 at times
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<blockquote data-quote="Zona14Stang" data-source="post: 14787457" data-attributes="member: 162211"><p>Has anyone seen afr bank 1 go to zero for a second or two on datalogs using the SCT X4 and laptop? I was data logging my latest tune and all my knock sensor problems are gone. The only thing I notice is at low rpm when you accelerate by pushing down anywhere from 1/4 to 1/2 throttle I get a slight bog then t goes. I do not see any knock sensors going of but on one log I see it go to 0 on one of the banks. What should afr be at? [ATTACH]39111[/ATTACH]</p><p></p><p>Could this just be a logging thing or a don't care? or do I have a bad 02 sensor?</p><p>Or is AFR 0 good ? </p><p>so according to wikepedia LOL..</p><p></p><p>2 is running rich.. and my value of 0 is lean </p><p></p><p>Air–fuel equivalence ratio (λ) [edit]</p><p>Air–fuel equivalence ratio, λ (lambda), is the ratio of actual AFR to stoichiometry for a given mixture. λ= 1.0 is at stoichiometry, rich mixtures λ < 1.0, and lean mixtures λ > 1.0.</p><p></p><p>There is a direct relationship between λ and AFR. To calculate AFR from a given λ, multiply the measured λ by the stoichiometric AFR for that fuel. Alternatively, to recover λ from an AFR, divide AFR by the stoichiometric AFR for that fuel. This last equation is often used as the definition of λ:</p><p></p><p>\lambda = \frac{AFR}{AFR_{stoich}}</p><p>Because the composition of common fuels varies seasonally, and because many modern vehicles can handle different fuels, when tuning, it makes more sense to talk about λ values rather than AFR.</p><p></p><p></p><p>Guess I answered my own question have to talk to my tuner to verify</p><p>Has anyone seen this big of a difference on their measured AFR's??</p></blockquote><p></p>
[QUOTE="Zona14Stang, post: 14787457, member: 162211"] Has anyone seen afr bank 1 go to zero for a second or two on datalogs using the SCT X4 and laptop? I was data logging my latest tune and all my knock sensor problems are gone. The only thing I notice is at low rpm when you accelerate by pushing down anywhere from 1/4 to 1/2 throttle I get a slight bog then t goes. I do not see any knock sensors going of but on one log I see it go to 0 on one of the banks. What should afr be at? [ATTACH]39111.vB[/ATTACH] Could this just be a logging thing or a don't care? or do I have a bad 02 sensor? Or is AFR 0 good ? so according to wikepedia LOL.. 2 is running rich.. and my value of 0 is lean Air–fuel equivalence ratio (λ) [edit] Air–fuel equivalence ratio, λ (lambda), is the ratio of actual AFR to stoichiometry for a given mixture. λ= 1.0 is at stoichiometry, rich mixtures λ < 1.0, and lean mixtures λ > 1.0. There is a direct relationship between λ and AFR. To calculate AFR from a given λ, multiply the measured λ by the stoichiometric AFR for that fuel. Alternatively, to recover λ from an AFR, divide AFR by the stoichiometric AFR for that fuel. This last equation is often used as the definition of λ: \lambda = \frac{AFR}{AFR_{stoich}} Because the composition of common fuels varies seasonally, and because many modern vehicles can handle different fuels, when tuning, it makes more sense to talk about λ values rather than AFR. Guess I answered my own question have to talk to my tuner to verify Has anyone seen this big of a difference on their measured AFR's?? [/QUOTE]
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