Startup surge 07 Charger

[WongBob]

Been trying to get a startup issue lined out on an 07 Charger 5.7 with a comp 268 cam. When I start the car hot or cold it will surge 3-4 times and level off. Once it levels off it is good in any other situation. Part throttle and WOT is done, but I would like to get rid of the startup surge. I have tried adjusting the throttle body airflow, large and small range, and startup airflow. Nothing seems to help other than raising the large/small ranges at 31lb/hr to match at 72lb/hr. I know that isnt correct but it helps. I tried lowering throttle body airflow, but that makes the surging worse. Any tips would be greatly appreciated.


07 Charger RT OL Cranking Test.hpt

[Speedmaster747]

Have you tried playing with the idle derivate and proportional tables on P/N ?

[WongBob]

Yea thats how I got rid of all the other surging.

[Hemituna]

If reducing TB airflow made it worse, try icreasing TB airflow under 1v.
This will slow and reduce TB movements at idle and may help calm it down.