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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="SecondhandSnake" data-source="post: 15739037" data-attributes="member: 116684"><p>As is the ISC neutral idle air and transfer functions are stock - for an 03 Cobra, as it should be now.</p><p></p><p>MAF transfer function...that one isn't very feasible. I'm running an HPX-E and down low it doesn't match defaults very well. It's in a less than ideal spot, welded into the pipe, but I don't have any flexibility there. I don't think that's the issue.</p><p></p><p>I am tempted to reset the throttle stop. Looking at the stock tables, for a 750 RPM idle it should be commanding around 60% DC. That seems to match what I have, though everyone seems to set theirs at a much lower DC.</p><p></p><p>As is the integrator is very positive upon startup, between 0.15-0.40, ergo why I want to dump more air in via ISC neutral idle air. Right now going off the top of my head I think the air through the TB value is set at 0.525. Is the stock 03 value definitely 0.40?</p><p></p><p>Also for calculating flow through the TB- wouldn't you use the IAC transfer function to translate duty cycle to mass flow?</p><p></p><p>I think dashpot is functioning as intended. It's when it hands off from dashpot to idle control that it falls on its face, so it's all in the realm of idle air control.</p><p></p><p>I think we're both on the same page that the issue is calibrating the idle air control, both electronically and physically, i.e. ISC neutral idle air, air flow through throttle, and throttle stop.</p><p></p><p>EDIT:</p><p>Found a couple of points in a recent log with a steady idle. Doing the math to calculate air bypassed it's in the ballpark of 0.23lb/min, vs the calibration value of 0.525lb/min. That would explain the large ISC integrator values trying to compensate for that. Sounds like I need to increase the throttle stop and adjust the calibration to match.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 15739037, member: 116684"] As is the ISC neutral idle air and transfer functions are stock - for an 03 Cobra, as it should be now. MAF transfer function...that one isn't very feasible. I'm running an HPX-E and down low it doesn't match defaults very well. It's in a less than ideal spot, welded into the pipe, but I don't have any flexibility there. I don't think that's the issue. I am tempted to reset the throttle stop. Looking at the stock tables, for a 750 RPM idle it should be commanding around 60% DC. That seems to match what I have, though everyone seems to set theirs at a much lower DC. As is the integrator is very positive upon startup, between 0.15-0.40, ergo why I want to dump more air in via ISC neutral idle air. Right now going off the top of my head I think the air through the TB value is set at 0.525. Is the stock 03 value definitely 0.40? Also for calculating flow through the TB- wouldn't you use the IAC transfer function to translate duty cycle to mass flow? I think dashpot is functioning as intended. It's when it hands off from dashpot to idle control that it falls on its face, so it's all in the realm of idle air control. I think we're both on the same page that the issue is calibrating the idle air control, both electronically and physically, i.e. ISC neutral idle air, air flow through throttle, and throttle stop. EDIT: Found a couple of points in a recent log with a steady idle. Doing the math to calculate air bypassed it's in the ballpark of 0.23lb/min, vs the calibration value of 0.525lb/min. That would explain the large ISC integrator values trying to compensate for that. Sounds like I need to increase the throttle stop and adjust the calibration to match. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
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