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Potential Tuner
Speed off after gear change
I have a C6 Z all was well then I went to a 4:10 gear. I did the program change now the car reads OK but on the scanner is way off at 60 scanner show about 20. I have 4.4.4 soft ware and using MPVI2 also checked it with MPVI same results. Please Help.
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If you gave us something to look at, like the two tune files before/after the gear change, and a log, and your channel config so we can see what you're seeing, if you gave us all that it might still be impossible to answer. It could be a car mechanical/wiring issue that's nothing to do with the tune or the software. Hell, you didn't even bother to mention the year - "C6 Z" covers both the E40 & E38 ECMs. But without any of that it's definitely impossible to answer.