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cooper1965, if you are referring to the fact that I called E85 compatibility a hack, sorry but it is.
It was never offered from the factory as a stock option for "flex fuel" on these vehicles. Because of that it is a hacked in place change.
Regardless if there are tables that allow for it, and that the tune "uses" those tables, it doesn't change the fact that GM never decided to offer it as an option. Considering how popular "flex-fuel" is, there has to be a reason, and that probably being that to get the tune 100% buleltproof for this application was unreasonable, otherwise they would have offered it.
This isn't some sort of "guess" it is fact. They did not offer it, period.
Thus I stand by my assessment that it is a "hack", just like meth-injection is a "hack". Anything added after the initial engineering is a matter of concern. Larger turbo, not a "hack" given the fact it was turbocharged from the factory. Modified tune to use a larger turbo, again, not a hack as it is using stock programming.
Now a LOT of tunes are pure "hacks" and not calculated modifications. Again, why lots of people have problems and blow engines.
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