80% LOL

I started out adding 30% across the whole map when converting my MSM but ended up reducing most rows below Wot to 10-15% to reach the desired lambda targets. Hydra, Rc550 and ~15 psi.
I ran 2 tanks on e85 before switching back to gas. Stock fuel pump died the week after.

Why did u switch back to pump gas?

Mostly availability. Also we got 98 RON here in Norway so detonation is less of a problem.

Your 98 and USA 93 are the same thing its just a different testing system.

Dann

OP - you are on the right track. Get the ms3 from Rev, then get some quality ev14 injectors and i'd suggest pump as well (dw200). The only downside to e85 for most is lack of availability. If you don't have this problem, you don't have a problem:)

In addition to above I upgraded my fuel lines, fuel filter assy, fuel rail and injector O-rings.

lolol

Still sounds like it may be worth it to go e85 to squeeze the most out of my tiny turbo safely.

It also sounds like a good idea to keep a well tuned 91 octane map on hand for any trips with questionable e85 availability.

Thanks for the info, still need to do more research on this. I'm going to get the car running on the new motor/setup with 91 first and switch over. I'll probably need larger injectors anyways.

If you convert to E85 and then one day can't get any around you but need to drive the car so you have to run regular gas, do you need to sifon all the remaining E85 out of your tank or can you mix them? I would think you'd have to drain the tank fully...

Another benefit I see to E85 is for track-cars; I have zero detonation on the street, and there is headroom in my tune, but I've gotten pinging at the track when temps are high and running 91. My solution has been to throw a couple gallons of 100 in the tank to bring the octane avg a bit higher when I'm at the track, but 100 is $9/gallon at the track - so I would consider making the switch if I can get E85 near me... then just fill up some extra jugs and bring them to the track with me... might be more trouble than it's worth though...

-Ryan

You can mix them but you'll need to retune based on what you end up with percentage-wise. Probably more time consuming than siphoning out the E85. When I switched between E85 and pump91 on my previous car, I tried to get the tank below 1gal before refilling and switching maps, and that 1:15 mix made no significant difference on how the car ran on the street. Though on a race car pushed to the limit, I would not chance it.

Has anyone figured out how to do this with MS yet?

Its certainly possible...Both MS2 and 3 have the setup for it.Haven't seen anyone try it yet here though.
I just switch maps.

Theres a megasquirt thread on SF about it I believe they got it pretty close but the proefi is still a little better.

You can hook up a GM flex fuel sensor to megasquirt to determine exact ethanol content and adjust fueling accordingly. Unfortunately the GM flex fuel sensor is very expensive, but you could get lucky and find one in a junkyard or something.