Hunter of Trolls
Join Date: Nov 2012
Location: east coast
Thanked 196 Times in 152 Posts
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I'm 99% certain that superchips has a file that disallows a tune to 'stack'.. It won't allow you to re-write a table unless the stock file is unaltered..
I will agree with you to the same 99% certainty because of that..
I can't find anything conclusive about 'other' tuners, though.. this is what I DO know (or, at least with 90% certainty)-
all brands/methods of tuners communicate with the PCM with the same write/rewrite instructions.. there is only one way to do that.. the information they provide the PCM with is the same language/script, as that is set by FoMoCo parameters.. The tables of data they replace, though, is different- some alter this table, others alter another.. some alter how data from sensors are interpreted and stored, others alter how it is translated to other functions..
with the SCT tuners I've used in the past for gassers, the SCT didn't verify the 'unaltered' file to check for stock integrity before it started writing away.. it stored a literal image of whatever was there.. this allowed a person to load up a superchips tune, and then stack an SCT tune on top.. the SCT would retain a 'stock' tune that embedded the SuperChips tune.. you could not do this in the reverse order, though, because the superchips verified that one file for authenticity before it would allow you to tune..
If I could just obtain an image of the PCM in it's current and complete state, I wouldn't be looking for a way to back-door this thing.. Our off-road tunes aren't going to be available forever, is my reckoning- or, they won't be around as long as I intend to keep this truck..