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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Losing fuel control in upper RPMs
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<blockquote data-quote="tvanlant" data-source="post: 14231654" data-attributes="member: 77614"><p>Yes, the short trims show how the tune is very close (3-5% correction), then at ~6400 the A/Fs lean out and the short terms are showing up to 15% correction needed, but it won't respond to any correction in the tune.</p><p></p><p>So... </p><p>1. It is running out of fuel.</p><p>2. Something in the tune is overriding the commanded Lamda of .80</p><p></p><p></p><p>Problem #1 seems unlikely due to the fact that it's holding fuel pressure at the rail, and I'm not anywhere near the HP limit of the typical stock pump/BAP. And I've tried a 21V BAP and it leans out exactly the same, at the same spot.</p></blockquote><p></p>
[QUOTE="tvanlant, post: 14231654, member: 77614"] Yes, the short trims show how the tune is very close (3-5% correction), then at ~6400 the A/Fs lean out and the short terms are showing up to 15% correction needed, but it won't respond to any correction in the tune. So... 1. It is running out of fuel. 2. Something in the tune is overriding the commanded Lamda of .80 Problem #1 seems unlikely due to the fact that it's holding fuel pressure at the rail, and I'm not anywhere near the HP limit of the typical stock pump/BAP. And I've tried a 21V BAP and it leans out exactly the same, at the same spot. [/QUOTE]
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2011-2014 Mustangs
Engine/Tuning
Losing fuel control in upper RPMs
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