I was thinking to rebuild my T56 tranny: the way it shifts is (usually) a sign of worned synchros... (slow shifts and gear clash).
Because of another reason I removed the belt of my Vortech SC and noticed how good and fast I was able to shift

I think there is a residual pressure between the blower and the throttle body: this "pushes" some air in the engine and doens't allow it to reduce the RPM.
This could be caused by a too small bypass valve, but right now I don't want to modify the system

This is a mechanical throttle body with an idle pintle: is there a way to reduce RPM during shifts modifying the program? Like reducing timing? Or cutting off the fuel?

Another thing I noticed: the F-bodies (like mine) have the idle set at 800 rpm. It is 800 when the car doesn't move, but when I drive (no gas) and push the clutch the engine speed doesn't drop below 1000 rpm. Why? This is not a clutch issue, it's something in the program. Is there a reason? How can I modify that using LS1Edit?

Thanks - Stefano