zebra
Well-Known Member
- Messages
- 199
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- cold & windy
Looking around the forums, I can't find anything on folks reprogramming different tire size in the PCM so that the speedometer & odometer read correctly. Are folks not fixing this when changing tire sizes, or are they just not talking about it?
I simply want to confirm what methods are available aside from mailing the computer back to a shop (or buying a crappy handheld generic tune module). We're happy with our PCM of NC custom tune, which corrected for our current 285/75-17s (33.8"), but I'm eyeballing some 255/80-17s for our next set (32.8 to 33.3", depending on the model). Of the stealerships here in town: one quoted $110 for 1hr of computer flashing, and the other said it'd be ~$350 for GM to write a custom flash & them to download it to the truck... which is absolute horses#!t because I did my previous 99 GMC with a friend's TechII in about 5min after changing to 33s.
I obviously don't still live near that friend and ain't sure if the E38 PCM is as easy as a 0411 to update the revolutions per mile for the VSS. Thoughts?
I simply want to confirm what methods are available aside from mailing the computer back to a shop (or buying a crappy handheld generic tune module). We're happy with our PCM of NC custom tune, which corrected for our current 285/75-17s (33.8"), but I'm eyeballing some 255/80-17s for our next set (32.8 to 33.3", depending on the model). Of the stealerships here in town: one quoted $110 for 1hr of computer flashing, and the other said it'd be ~$350 for GM to write a custom flash & them to download it to the truck... which is absolute horses#!t because I did my previous 99 GMC with a friend's TechII in about 5min after changing to 33s.
I obviously don't still live near that friend and ain't sure if the E38 PCM is as easy as a 0411 to update the revolutions per mile for the VSS. Thoughts?