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Cobra Forums
The Terminator
Engine/Tuning
Part throttle A/F question for you tuners out there.
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<blockquote data-quote="ALA G8R" data-source="post: 1847571" data-attributes="member: 6572"><p>I got a pretty darn good reason for the part throttle A/F response from Jerry@SCT over at ModularFords.com.</p><p></p><p>This is interpretation of what he said.</p><p></p><p>At partial throttle the PCM strives to keep A/F at stoich thus optimizing fuel economy. At the same time the PCM pulls timing, based on RPM and load, to keep the engine from knocking.</p><p></p><p>When you want more power, go past the WOT throttle position and the PCM commands the open loop A/F to maximize power. At the same time timing is advanced to maximize power, but not enough to cause knock.</p><p></p><p>Makes pretty good sense to me. I never have experienced audible knock at part throttle, under load.</p></blockquote><p></p>
[QUOTE="ALA G8R, post: 1847571, member: 6572"] I got a pretty darn good reason for the part throttle A/F response from Jerry@SCT over at ModularFords.com. This is interpretation of what he said. At partial throttle the PCM strives to keep A/F at stoich thus optimizing fuel economy. At the same time the PCM pulls timing, based on RPM and load, to keep the engine from knocking. When you want more power, go past the WOT throttle position and the PCM commands the open loop A/F to maximize power. At the same time timing is advanced to maximize power, but not enough to cause knock. Makes pretty good sense to me. I never have experienced audible knock at part throttle, under load. [/QUOTE]
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Engine/Tuning
Part throttle A/F question for you tuners out there.
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