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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: 15732811" data-attributes="member: 116684"><p>Thanks for the help. I'm waiting for the weather to break to test my theory. I had some positive results in trying to dial in ISC neutral idle air. But it kept bugging me those values seemed way too high.</p><p></p><p>Then I checked my IAC transfer function- still the stock 00 2V values. D'oh. I'm going to try throwing the stock 03 4V values in it and see if that helps clear it up, at least as a starting point. It's definitely ISC neutral air related, at least in my case. That would explain why it would idle fine from the last tuner with the same configuration (sans MAF); he knew enough to update those tables, I didn't even think of it.</p><p></p><p>Regarding your case I think it's going to need a lot more ISC air and bump up the idle a bit. That seems to be standard practice with bigger cams (and to be expected, it's moving more air at idle). I've also seen people with big cams pull a lot of timing around idle to increase load and make it a little more stable, but I don't know if I buy into that theory.</p><p></p><p>It's a shame there isn't a better way to calibrate the IAC transfer function; you just have to log ISC integrator and get what you get. It would be nice if there was a way to do a slow steady ramp or sweep through idle values to calibrate it.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 15732811, member: 116684"] Thanks for the help. I'm waiting for the weather to break to test my theory. I had some positive results in trying to dial in ISC neutral idle air. But it kept bugging me those values seemed way too high. Then I checked my IAC transfer function- still the stock 00 2V values. D'oh. I'm going to try throwing the stock 03 4V values in it and see if that helps clear it up, at least as a starting point. It's definitely ISC neutral air related, at least in my case. That would explain why it would idle fine from the last tuner with the same configuration (sans MAF); he knew enough to update those tables, I didn't even think of it. Regarding your case I think it's going to need a lot more ISC air and bump up the idle a bit. That seems to be standard practice with bigger cams (and to be expected, it's moving more air at idle). I've also seen people with big cams pull a lot of timing around idle to increase load and make it a little more stable, but I don't know if I buy into that theory. It's a shame there isn't a better way to calibrate the IAC transfer function; you just have to log ISC integrator and get what you get. It would be nice if there was a way to do a slow steady ramp or sweep through idle values to calibrate it. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
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