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SVT Shelby GT500
JDM SS cams and driveability
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<blockquote data-quote="genesmob" data-source="post: 16259698" data-attributes="member: 126984"><p>I have fully built motor with JDM ss cams and a whipple 4.0. It’s a great package that works better than they advertise. I have idle set at 750 rpm and experience perfect driveability with no hesitation or cruise issues. I would bet your problem has to do with a large Maf tube (required) and the low resolution at idle that comes with it. I tune my own car and have found with large maf tubes (149-155mm) you have to find a happy medium at low maf voltages (idle and low load cruise) You probably need some fine tuning of your maf curve. To check this I would datalog maf voltage and short term fuel trims while replicating this problem. If there are large stft swings and you notice maf voltage is the same or less at idle as it is at low load cruise, this is it. Ideally maf voltage should always increase as rpm and load rises. When the tube dia increases, the air velocity goes down sometimes causing inaccurate readings at low airflow. </p><p></p><p></p><p>Sent from my iPhone using Tapatalk</p></blockquote><p></p>
[QUOTE="genesmob, post: 16259698, member: 126984"] I have fully built motor with JDM ss cams and a whipple 4.0. It’s a great package that works better than they advertise. I have idle set at 750 rpm and experience perfect driveability with no hesitation or cruise issues. I would bet your problem has to do with a large Maf tube (required) and the low resolution at idle that comes with it. I tune my own car and have found with large maf tubes (149-155mm) you have to find a happy medium at low maf voltages (idle and low load cruise) You probably need some fine tuning of your maf curve. To check this I would datalog maf voltage and short term fuel trims while replicating this problem. If there are large stft swings and you notice maf voltage is the same or less at idle as it is at low load cruise, this is it. Ideally maf voltage should always increase as rpm and load rises. When the tube dia increases, the air velocity goes down sometimes causing inaccurate readings at low airflow. Sent from my iPhone using Tapatalk [/QUOTE]
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JDM SS cams and driveability
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