Quote Originally Posted by gmh308 View Post
Yes pasting in other tunes from different cars is real risky. There is plenty of stuff behind the scenes that GM calibrates differently from platform to platform year to year. Best to always start with the stock stuff and work from there.
I already had stock stuff in there. Randomly changing numbers is even more risky! That's why I chose to compare to a performance vehicle, go through all tables and select only the specific upshift parameters to modify. Once I observed the differences in performance I then found a middle ground. It's the cost of experimentation. Can't sit around waiting for someone else to give me the answers, right?