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BM3 doesn't read flex fuel sensors. As far as I recall, there isn't any tuning software that does for the M2. They don't link with the DME. There was a convo I was having with someone else on here not too long ago about it.
Pump e85 isn't actually e85 either, it's more like e40. Well, that's what the sources I was reading said back when I was having the convo. Wiki says USA e85 is 51-83% ethanol.
Either way, flex fuel would be pointless regardless of what e content the fuel has, because there isn't a working tunable flex fuel sensor for the m2.
So your options are:
1) Don't install flex fuel sensor, run pump e85, and use the BM3 e30 tune. Which is designed for e30 as a safety measure for pump e85 variaences.
2) Purchase your own e85 that has consistent ethanol content and get a custom tune for that.
If running e85, you want a bigger turbo though. Because the stock turbo would run out of it's efficiency range. It would make low end power, but fizzle out in the top end.
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