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<blockquote data-quote="Joeker" data-source="post: 1497778" data-attributes="member: 591"><p>ECU professor,</p><p></p><p>I have some confusion.</p><p></p><p>You mention that dUring cruising, the engine ECU looks for higher ignition?</p><p></p><p>During cruising, engine speed is constant and vacumn is hi. What does the engine need advanced ignition for?</p><p></p><p>Ignition is advance to catch up with engine speed, no?</p><p></p><p>And why do you need torque during cruising?</p><p></p><p>If the Engine ECU notch up the ignition during cruising, what will happend if the driver floors the pedal? more ignition? won't that create pre-ignition?</p><p></p><p>AFAIK, the ignition advance of a carburator engine runs on vacumn and centrifugal advance. I think both have little or no advance during cruising.</p></blockquote><p></p>
[QUOTE="Joeker, post: 1497778, member: 591"] ECU professor, I have some confusion. You mention that dUring cruising, the engine ECU looks for higher ignition? During cruising, engine speed is constant and vacumn is hi. What does the engine need advanced ignition for? Ignition is advance to catch up with engine speed, no? And why do you need torque during cruising? If the Engine ECU notch up the ignition during cruising, what will happend if the driver floors the pedal? more ignition? won't that create pre-ignition? AFAIK, the ignition advance of a carburator engine runs on vacumn and centrifugal advance. I think both have little or no advance during cruising. [/QUOTE]
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