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SVTPerformance's Chain of Restaurants
Tuning À la carte
Crank ISC duty cycle
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<blockquote data-quote="03Steve" data-source="post: 15296360" data-attributes="member: 5016"><p>First, I would get the logging working during crank condition. Without data it can be a shot in the dark. Fuel source, spark source, commanded lambda, spark, desired idle, ISC duty cycle, relative throttle, absolute throttle, fuel pressure, load, etc. You seem very familiar with the controls, so I'm going to assume you know what you are looking for based upon the information you have provided thus far.</p><p></p><p>I am not sure what you are using for logging. I am pretty sure that an X2 and Livelink 4.11 and/or Livelink 6.5 will work during a cranking state. I am not sure about other SCT devices or software versions. If by chance you are using Binary Editor 5.76 or similar it will definitely work during cranking.</p><p></p><p>From there, you have an engine that flares and dies. There are a few things that can cause this. If you are looking to minimize the flare, and you have cut cranking ISC down to the 30% level, it sounds like the closed throttle angle is high. You can try reducing it by wrenching on the throttle stop to close the blade a bit. On aftermarket throttle bodies and engine combos that usually requires some tinkering.</p><p></p><p>We can make guesses on what spark is doing, but the guesswork will be eliminated when spark source is identified during a cranking state. It doesn't always come from the table shown above during crank. Sometimes it will actually come from MBT. Load is typically above 50% during crank and RPM is around 150-200, so there are cheats you can do there when needed.</p><p></p><p>For air through ISC, there are a few possible RPM adders. Time based, ECT, ACT, A/C, etc.</p><p></p><p>For fueling, if the engine flares and dies sometimes it can be due to fueling, but not always. Capturing fuel pressure and commanded lambda is useful, along with the fuel injector DMR of your choice. </p><p></p><p>In summary, more information is needed during cranking.</p></blockquote><p></p>
[QUOTE="03Steve, post: 15296360, member: 5016"] First, I would get the logging working during crank condition. Without data it can be a shot in the dark. Fuel source, spark source, commanded lambda, spark, desired idle, ISC duty cycle, relative throttle, absolute throttle, fuel pressure, load, etc. You seem very familiar with the controls, so I'm going to assume you know what you are looking for based upon the information you have provided thus far. I am not sure what you are using for logging. I am pretty sure that an X2 and Livelink 4.11 and/or Livelink 6.5 will work during a cranking state. I am not sure about other SCT devices or software versions. If by chance you are using Binary Editor 5.76 or similar it will definitely work during cranking. From there, you have an engine that flares and dies. There are a few things that can cause this. If you are looking to minimize the flare, and you have cut cranking ISC down to the 30% level, it sounds like the closed throttle angle is high. You can try reducing it by wrenching on the throttle stop to close the blade a bit. On aftermarket throttle bodies and engine combos that usually requires some tinkering. We can make guesses on what spark is doing, but the guesswork will be eliminated when spark source is identified during a cranking state. It doesn't always come from the table shown above during crank. Sometimes it will actually come from MBT. Load is typically above 50% during crank and RPM is around 150-200, so there are cheats you can do there when needed. For air through ISC, there are a few possible RPM adders. Time based, ECT, ACT, A/C, etc. For fueling, if the engine flares and dies sometimes it can be due to fueling, but not always. Capturing fuel pressure and commanded lambda is useful, along with the fuel injector DMR of your choice. In summary, more information is needed during cranking. [/QUOTE]
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Tuning À la carte
Crank ISC duty cycle
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