Im looking into getting Fuel it Kit and running e40/50 my question is can I throw in 91 whenever? Im gonna be running JB4 with custom map as well with FBO
Fuel it is a ethanol content monitor. It monitors ethanol content. Not a flex fuel kit. You can do what ever you want, just adjust the tune to what makes sense.
If you have 91, run map 2, if you're on E40, you should have a custom JB4 tune from @Jesse DaBears. If you're on E50 with JB4 you'll get Mixture Too Lean because you're mixture is too lean and you're gonna blow shit up.
Like the previous people have said about it not being flex fuel sensor. When I had JB4 and custom tune, by Jesse, I had a custom 93 and custom E30, and just switched between those two different tunes, but all on map 6.