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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
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<blockquote data-quote="Bullitt5566" data-source="post: 15739145" data-attributes="member: 119066"><p>Correct for calculating the airflow around the TB. Use MAF counts to find the airflow in lbs and whatever isn't going through the IAC is going around the TB.</p><p></p><p>As far as the IAC integrator. It should be 0 at all rpms at a warm steady idle. In Livewire setup a datalog table (YouTube will show how) and datalog the average IAC integrator at warm idle and at the RPMs in the SCT IAC integrator tables. If the ECU is commanding more air add that value to the IAC idle table, negative subtract.</p><p></p><p>I have noticed that if you set the TB throttle stop to stock the dashpot values line up much better with the airflow required. The dashpot airflow values are in addition to what you are commanding for idle. For example a dashpot setting of 300rpm and .1 lbs means that for an rpm of idle+300 rpm add .1 lbs to the IAC idle value. When you crank the throttle stop open you are adding a ton more air and the dashport values will be way off, typically it pushes RPM up., causes hanging idle, etc.</p><p></p><p>As far as the falling on its face on the transition from drive to idle. I suspect the minimum moving dashpot settings are commanding too much air, forcing the RPM too far up. So when the ECU transitions from drive to idle the rpm drop too fast. You can datalog the dashpot, I bet RPM hangs until the dashpot decays to 0 then drops. Go into the dashpot minimum clip in low gears and set the lowest setting (300 rpm I think) to 0 and see if this helps. </p><p></p><p>Adjusting this is a huge PIA. It is tricky getting a balance between too much dashpot and hanging idle and too little and stalling when stopping.</p></blockquote><p></p>
[QUOTE="Bullitt5566, post: 15739145, member: 119066"] Correct for calculating the airflow around the TB. Use MAF counts to find the airflow in lbs and whatever isn't going through the IAC is going around the TB. As far as the IAC integrator. It should be 0 at all rpms at a warm steady idle. In Livewire setup a datalog table (YouTube will show how) and datalog the average IAC integrator at warm idle and at the RPMs in the SCT IAC integrator tables. If the ECU is commanding more air add that value to the IAC idle table, negative subtract. I have noticed that if you set the TB throttle stop to stock the dashpot values line up much better with the airflow required. The dashpot airflow values are in addition to what you are commanding for idle. For example a dashpot setting of 300rpm and .1 lbs means that for an rpm of idle+300 rpm add .1 lbs to the IAC idle value. When you crank the throttle stop open you are adding a ton more air and the dashport values will be way off, typically it pushes RPM up., causes hanging idle, etc. As far as the falling on its face on the transition from drive to idle. I suspect the minimum moving dashpot settings are commanding too much air, forcing the RPM too far up. So when the ECU transitions from drive to idle the rpm drop too fast. You can datalog the dashpot, I bet RPM hangs until the dashpot decays to 0 then drops. Go into the dashpot minimum clip in low gears and set the lowest setting (300 rpm I think) to 0 and see if this helps. Adjusting this is a huge PIA. It is tricky getting a balance between too much dashpot and hanging idle and too little and stalling when stopping. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
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