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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: 15296872" data-attributes="member: 43980"><p>Well you learn something new every day. I started logging with livelink 6.5 with KOEO and cranked it and no issue. I kept logging until it went into closed loop.</p><p></p><p>What is interesting is my most recent tune fired up and went into an idle perfectly. Ambient/ECT was 52 degrees, 24 hours since last run.</p><p></p><p>The things I fooled with are.</p><p></p><p>1-Added .3 to a block of base fuel table cells (circled in green) and feathered each adjacent cell surrounding by reduced amounts. I did this because I was having a major rich condition until it went into closed loop. 10.5 rich. This seemed to solve it even though I must say I'd rather find a true culprit. Now after I did this, once it fires it goes quickly to 13.5 and no more black smoke on fire. </p><p></p><p>[ATTACH]66301[/ATTACH]</p><p></p><p>2- I subtracted .3 from the entire crank ISC duty cycle table. This minimized the flare. ISC duty cycle during crank is .531 which appears to match what this parameter would be commanding when I eyeball interpolate.</p><p></p><p>3- I changed idle speed adder from 200rpm for 30 sec to 300 for 10. Perhaps this "caught" the RPM drop to keep it from stalling.</p><p></p><p>It seems to me a bunch of bandaids but since its just cold start and if I get it to behave I suppose i can live with it.</p><p></p><p>So on to my crank datalog......</p><p></p><p>During crank....</p><p></p><p>ISC duty cycle .531</p><p>Spark advance 8 degrees</p><p>Spark Source 0</p><p>Fuel source is 15 up until it fires than goes to 4</p><p></p><p></p><p></p><p></p><p>At hot idle my ISC duty cycle is .300. If I close the blade, this will be higher and I don't think I want it higher right?? The engine RPM drops ever so slightly when I unplug the ISC when hot.</p></blockquote><p></p>
[QUOTE="CJK440, post: 15296872, member: 43980"] Well you learn something new every day. I started logging with livelink 6.5 with KOEO and cranked it and no issue. I kept logging until it went into closed loop. What is interesting is my most recent tune fired up and went into an idle perfectly. Ambient/ECT was 52 degrees, 24 hours since last run. The things I fooled with are. 1-Added .3 to a block of base fuel table cells (circled in green) and feathered each adjacent cell surrounding by reduced amounts. I did this because I was having a major rich condition until it went into closed loop. 10.5 rich. This seemed to solve it even though I must say I'd rather find a true culprit. Now after I did this, once it fires it goes quickly to 13.5 and no more black smoke on fire. [ATTACH]66301.vB[/ATTACH] 2- I subtracted .3 from the entire crank ISC duty cycle table. This minimized the flare. ISC duty cycle during crank is .531 which appears to match what this parameter would be commanding when I eyeball interpolate. 3- I changed idle speed adder from 200rpm for 30 sec to 300 for 10. Perhaps this "caught" the RPM drop to keep it from stalling. It seems to me a bunch of bandaids but since its just cold start and if I get it to behave I suppose i can live with it. So on to my crank datalog...... During crank.... ISC duty cycle .531 Spark advance 8 degrees Spark Source 0 Fuel source is 15 up until it fires than goes to 4 At hot idle my ISC duty cycle is .300. If I close the blade, this will be higher and I don't think I want it higher right?? The engine RPM drops ever so slightly when I unplug the ISC when hot. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Crank ISC duty cycle
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