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SVTPerformance's Chain of Restaurants
The Distillery
if i tune on real e85 will ecu adjust for e70?
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<blockquote data-quote="Radar Doc" data-source="post: 12874385" data-attributes="member: 111756"><p>Shaun,</p><p></p><p>I've always understood the STFTs and LTFTs (or whatever adaptive measures) to adjust the mixture so that measured AFR equals the commanded. </p><p></p><p>So, if my stoich is set to 9.85 for E85 and WOT lambda is, say 0.84 at a given RPM, then the computer (based on O2 sensor input) is going to use STFTs and LTFTs (or whatever adaptive measures) to make that so (9.85 x 0.84=8.274 AFR). </p><p></p><p>If I'm running E70 with these parameters, I believe the car will run somewhat rich because the computer will be commanding 8.274 AFR (and measured will be 8.274) when the AFR should be 10.6975(E70 stoich) x 0.84=8.9895. Not a huge difference, but still rich.</p><p></p><p>I know you're busy, but if you get a chance and can explain why my thinking is wrong, I'd certainly appreciate it.</p><p></p><p>Thanks,</p><p>Mike</p></blockquote><p></p>
[QUOTE="Radar Doc, post: 12874385, member: 111756"] Shaun, I've always understood the STFTs and LTFTs (or whatever adaptive measures) to adjust the mixture so that measured AFR equals the commanded. So, if my stoich is set to 9.85 for E85 and WOT lambda is, say 0.84 at a given RPM, then the computer (based on O2 sensor input) is going to use STFTs and LTFTs (or whatever adaptive measures) to make that so (9.85 x 0.84=8.274 AFR). If I'm running E70 with these parameters, I believe the car will run somewhat rich because the computer will be commanding 8.274 AFR (and measured will be 8.274) when the AFR should be 10.6975(E70 stoich) x 0.84=8.9895. Not a huge difference, but still rich. I know you're busy, but if you get a chance and can explain why my thinking is wrong, I'd certainly appreciate it. Thanks, Mike [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
if i tune on real e85 will ecu adjust for e70?
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