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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: 15295058" data-attributes="member: 43980"><p>I believe it is dialed in. I needed to load the ISC functions from the 03/04 cobra since that the valve I am using now. Now at hot idle ISC duty is at .29 and itegrator is near zero. Idle in closed loop is fine, MAF xfer is correct.</p><p></p><p>Startup multiplier multiplies what? I assume this comes into play following initial fire?</p><p></p><p>I have a crank ISC duty cycle which I assume will move the ISC pintle to a predetermined position based on ECT with KOEO. Once the engine fires and there are sensors providing feedback, I also assume that the ISC is free to adjust to maintain idle RPM. </p><p></p><p>In my case, I get an RPM flare to maybe 2000 at initial fire, the RPM cuts usually stalling the car. If I give it a little blip to keep it from stalling it settles into a decent idle immediately. I cut back the crank ISC duty cycle table to reduce the duty cycle across the board by .3 and tested. The RPM flare is less and on a dead cold engine, still drops RPM but does not stall. I am not sure if I am on the right track here.</p><p></p><p>My question is is there a procedure to adjust crank ISC duty cycle based on logged duty cycle. For example if I log immediately after fire and find logged ISC duty cycle to be .660 at X ECT would I want Crank ISC duty cycle to match or be some percentage + or -??</p></blockquote><p></p>
[QUOTE="CJK440, post: 15295058, member: 43980"] I believe it is dialed in. I needed to load the ISC functions from the 03/04 cobra since that the valve I am using now. Now at hot idle ISC duty is at .29 and itegrator is near zero. Idle in closed loop is fine, MAF xfer is correct. Startup multiplier multiplies what? I assume this comes into play following initial fire? I have a crank ISC duty cycle which I assume will move the ISC pintle to a predetermined position based on ECT with KOEO. Once the engine fires and there are sensors providing feedback, I also assume that the ISC is free to adjust to maintain idle RPM. In my case, I get an RPM flare to maybe 2000 at initial fire, the RPM cuts usually stalling the car. If I give it a little blip to keep it from stalling it settles into a decent idle immediately. I cut back the crank ISC duty cycle table to reduce the duty cycle across the board by .3 and tested. The RPM flare is less and on a dead cold engine, still drops RPM but does not stall. I am not sure if I am on the right track here. My question is is there a procedure to adjust crank ISC duty cycle based on logged duty cycle. For example if I log immediately after fire and find logged ISC duty cycle to be .660 at X ECT would I want Crank ISC duty cycle to match or be some percentage + or -?? [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Crank ISC duty cycle
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