I have a friends car to try and improve the driveability. He had a shop build it and then they quit before it was finished. It's a 57 Chevy with a 2010 L99 and 6L80e, supposedly from the same car but the trans OS doesn't match a Camaro. The engine has some sort of Tilden Ultra4 cam in it, long tube headers, 3" dual out with an x-pipe and no cats, and has had the AFM and VVT physically removed. I think the fuel system is a GM pump because I don't see a regulator anywhere, one line straight to the rail....so 58psi. I think it still has the stock Torque converter. I spent a bunch of time on an Eddy current dyno and had the VVE pretty well dialed, but every day it seems to be different. I'm also having a tough time getting the idle to be stable. I turned off all the adaptives I could find and it still varied the timing and the throttle opening. It just oscillates and can't find a stable idle...which I think is making the slow speed driveability...crappy. The engine keeps hunting for an idle and is loading and unloading the cam making it really tough to drive slow. Getting pretty frustrated at this point, so I'm probably missing something.
Today I went through this guide
https://forum.hptuners.com/showthrea...e-tuning-guide
but it would only stabilize every other flash, the other times it would just oscillate or hang at ~1000rpm...even with a 2% change in Airflow final minimum... and I wasn't getting useful data....just making blind timing or final airflow minimum changes, but it seemed to be happier around 10 degrees. I ended up using the parameters from his G8 Best Idle and went for a drive...same issues...and even after 10 iterations of VVE at 1/2 percentage it's all over the place again.
I'm attaching the last tune from today and the first part of the drive before it went into limp mode.
Open to any suggestions.