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SVTPerformance's Chain of Restaurants
Tuning À la carte
Crank ISC duty cycle
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<blockquote data-quote="CJK440" data-source="post: 15294716" data-attributes="member: 43980"><p>As I continue to try to tune cold starts so it will fire and come to an idle without throttle input I find all that is left is to try to tune out an RPM flare at first fire that causes RPM to immediately fall low enough to stall. Second crank fires ok and doesn't drop too low and it stabilizes.</p><p></p><p>I came accross "Crank ISC duty cycle" in SCT Advantage. I assume this is a commanded ISC position during crank. I looked at a cold idle log and saw that in fuel source 4 (open loop cold base fuel) my ISC was around .660 at open loop idle when my crank ISC duty cycle looked like it was commanding somewhere around .850. </p><p></p><p>For a test I dropped my entire Crank ISC duty cycle column by .2 and tested. Flare seems to be gone.</p><p></p><p>I'm wondering if crank ISC duty cycle should be dialed in using logged ISC duty cycle at the various ECT points either to match or be modified by a certain percentage to allow the engine to start and not have such a change in ISC position. </p><p></p><p>Am I on the right track?</p></blockquote><p></p>
[QUOTE="CJK440, post: 15294716, member: 43980"] As I continue to try to tune cold starts so it will fire and come to an idle without throttle input I find all that is left is to try to tune out an RPM flare at first fire that causes RPM to immediately fall low enough to stall. Second crank fires ok and doesn't drop too low and it stabilizes. I came accross "Crank ISC duty cycle" in SCT Advantage. I assume this is a commanded ISC position during crank. I looked at a cold idle log and saw that in fuel source 4 (open loop cold base fuel) my ISC was around .660 at open loop idle when my crank ISC duty cycle looked like it was commanding somewhere around .850. For a test I dropped my entire Crank ISC duty cycle column by .2 and tested. Flare seems to be gone. I'm wondering if crank ISC duty cycle should be dialed in using logged ISC duty cycle at the various ECT points either to match or be modified by a certain percentage to allow the engine to start and not have such a change in ISC position. Am I on the right track? [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Crank ISC duty cycle
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