2017 Challenger 6.4L MT with Crower cam 222/231 .554/.556 with Comp Limiter and full Stainless Works long tube header and off-road exhaust. Will start just fantastic but then as it transitions off the startup air after about 30 seconds it just falls off to 0 RPM. Been around the horn with changes that I thought might have an effect but still does it. Have tried with ANN on and off as well as different cam settings to try and move it off 134-deg where it seems to want to stay. Any advice that might make a difference. The Dodge aren't my norm so I seem to be wrapped around the axle here.
Hey Mate,
Any chance you could put up a tune file from an earlier version of vcm? It's not opening in 3.6, and I'm not keen on the hassle of getting downloading the new beta at the moment. Take my advice with a grain of salt, because I only have experience with my cammed 2006 5.7, but I'll explain what I've learnt over the past few weeks of tinkering. Try tweaking your throttle body airflow table (probably in Airflow-General). Between zero and 1v, try decreasing the flow values by 10 or 20%. This tricks the computer into opening the throttle more at idle, hopefully preventing your stalling. Also try reducing the strength of the P, I and D factors in the idle control settings. I halved my values for the spark torque control, and am using 1/3 less for the throttle control.
Most importantly ,try getting in touch with Hemituna, he seems to be the expert with these things.
I've got it up and running now with a good stable idle. Logging my actual torque and frictional losses, the actual was running well below the frictional losses. I increased the Desired Airmass vs. Torque table uniformly in small amounts until the actual torque equaled the frictional losses and now have a nice, steady idle. My idle spark is running around 10-degrees lower than the PT spark advance at the idle airmass so I may be a bit heavy on the desired air mass at this point, but I need to work the fueling corrections a bit before I go back the trim the airmass table back. I'm confident enough at this point to start the dyno work and try to map out the cam tables.
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