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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Vp ms109
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<blockquote data-quote="corepwn" data-source="post: 14898546" data-attributes="member: 110539"><p>You have a fundemental misunderstanding of how lambda works.</p><p></p><p>14.1 stoich x 0.78 lambda = 10.99AFR</p><p>13.4 stoich x 0.78 lambda = 10.45AFR</p><p></p><p>When the computer is tuned for a e10 stoich (14.1~) the computer is going to use the WB02s to target the commanded lambda for the set stoich. In this example, that's 10.99AFR. The problem is that the stoich for MS109 is different, and requires even more fuel to hit it's lambda of 0.78 which would be a 10.45 AFR. </p><p></p><p>So in Rip's tune the lambda has remained the same in the tune but the stoich is wrong, which causes him to run a 10.99 AFR where the fuel should really be at 10.45AFR, hence the lean condition. </p><p></p><p>The only thing that needs to change in the tune is the stoich value (and timing), lambda tuning is great.</p></blockquote><p></p>
[QUOTE="corepwn, post: 14898546, member: 110539"] You have a fundemental misunderstanding of how lambda works. 14.1 stoich x 0.78 lambda = 10.99AFR 13.4 stoich x 0.78 lambda = 10.45AFR When the computer is tuned for a e10 stoich (14.1~) the computer is going to use the WB02s to target the commanded lambda for the set stoich. In this example, that's 10.99AFR. The problem is that the stoich for MS109 is different, and requires even more fuel to hit it's lambda of 0.78 which would be a 10.45 AFR. So in Rip's tune the lambda has remained the same in the tune but the stoich is wrong, which causes him to run a 10.99 AFR where the fuel should really be at 10.45AFR, hence the lean condition. The only thing that needs to change in the tune is the stoich value (and timing), lambda tuning is great. [/QUOTE]
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