Switching to and from E85

[devo321]

Thing is, with E85, you never know what you're going to get out of the nozzle at the gas station. They do it by vapor pressure not E concentration now. So where it used to be pretty straight forward and you knew roughly what you were going to get, you don't anymore. Luckily down here, I usually get close to E85, but when I'm mathing it trying to keep it around E60 or so (it's what I'm limited to by my fuel pump at the moment) then I run the car for a few minutes and I've got more pesky 93 in there than I want, it's the worst. Make sure you're GTG.

I think the CREC took care of most of the shortfalls for the 3.0t with the port injection. Now if we can just get someone with the proper E-85 sensor that adjusts the map automatically, that'd be the new hotness I think.

Yeah, I'd essentially be looking at doing the same. Probably something like E70 but the 034 tune asks to be between 60 and 85. More concerned about going the opposite way back to 91. AZ has a min content of 54, so the number of gas stations that actually try to get to E85 are slim. Arizona car scene is pretty good at keeping the E85 info up to date though.

What??? Like DS1 does?

Up in Mid-Atlantic area, Sheetz is the common supplier for "E85". The few times I have tried it pure (0 miles on the counter), I got ~70% E content, so I adjusted all my calculators and I'm usually within about 2% mix to sensor.

If you are desperate to know without a sensor, get you one of those little E Bottles and test it one day. They're anywhere from $10-40 on Amazon and work well. I did it for a long time on my A5 before I added a sensor and then actually used it to calibrate the sensor! (Continental vs eBay sensors)

Cheers,

KS

Going to pick up a tester along with a sensor when I get around to it. Def want to know what I'm putting in the tank.

As far as I know, DS1 doesn't support the 3.0t platform?
Would 100% jump to a tune that adjusts the map automatically if someone decides to support the supercharged platform.