2005 Magnum RT, heavily modified, engine rebuilt .020 over, boost cam, ported heads and intake manifold, torqstorm supercharger, smaller pulley, and 6spd manual conversion with a lightened flywheel (the dodge challenger dual mass is too expensive and wouldn't work with the ACT clutch) for the big changes.
I've used this vehicle very much as a test bed and learning tool for tuning and tried to notate as many of my changes as possible. Recently switched to a smaller pulley for 2 more psi and a bigger 90mm throttle body and ported the manifold to match (at that time I found out the previous arrington 85mm unit had a reducer stuck on the back of it which negatively affected a lot of math). Since moving to manual it has always had throttle issues, and I discovered a lot of it was due to the misconception on the size of the TB. Went back in and fixed a lot of the throttle body modeling following guides on here and now the overall powerband and throttle response is drastically improved, however just at random sitting clutch in or in N, my idle RPMs will shoot up and begin cycling, sometimes even stalling out. Other than that, the car is a joy to drive. The only oddball bit of tune is that the car thinks it is always in Neutral (this was an early PCM that couldn't be modified to accept a manual tune) so I don't know if that as effects on how the car digests information but it doesn't seem to have much if any. Have attached tune and log. This time, once it started cycling, it eventually couldn't save itself from the stall. This makes it an enormous pain in the *** in traffic. Any help or direction where to go would be incredibly appreciated as I've been chasing throttle issues ever since the manual conversion and I'm unsure if I need to keep going down the TB airflow rabbit hole, the Idle Torque spark tables, or the spark minimum (because it does seem like the timing goes low before it tries to catch itself), if I can make it smooth to take off in, I might finally finish fiddling with this tune (probably not).
newpulleytunecomp1norumbletimingtunePEup90mmCurvechangeXminsparkidleRPM.hpt
idlestall.hpl
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