E85 with a Stillen supercharger?

R3drckt09

Is it a lot more expensive to run E85? I'm moving to Albuquerque NM in about a year and a half and they don't have 93, but they do have a few E85 has stations so I'm considering just changing to that

Chuck33079

It's a coin flip. It's cheaper per gallon, but your mileage will drop.

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dmhenderson

"significantly"

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roplusbee

I questioned Phunk about this adamantly. I was going to make the change, but I needed to know that I would have the range to make 400-500 highway miles. I can make 500+ highway miles on 93 OCT, but I barely get 225-250 miles stop and go. Charles said that he hasn't attempted any long range trips with his setup and could not give me any good feedback, but he did give me a wealth of information on stop and go, local/short range trips, and spirited driving. Let's just say that he has a good idea of where all of the local stations are that carry E85 in his area.

So if you loose say 30% of your fuel economy AND sitting right at the edge of vacuum/boost for max efficiency, that would put my best range at 350+ miles highway and 157-175 miles stop and go. That is no where near what is necessay to make it the distance from station to station (that sell E85) in some sections of I-20E (my preferred route) or Arkansas, Tennessee, and the Appalachian Mountains. Pretty much screwed as soon as I leave TX until I make it to the East Coast states.. That is why no E85 for me. If you a planning to make the switch, please do your homework or get another vehicle to DD. And for reference, my other vehicle is an 04 Tahoe......so much for efficiency.

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phunk

I dont get to leave town much! The furthest I generally get is about 100 miles out, in which case I can do that round trip on a tank.

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LukasC

You arnt screwed just switch to ur 93 map and put 93 in and good to go.

dmhenderson

It's not quite that easy. You have to have the tank completely empty before you do that. These aren't engines that are designed for flex fuel that automatically adjust the ECU based on fuel mix. It's 100% one or 100% the other.

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phunk

Get it down until the gas light has been on for a few minutes and that will be enough!

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synolimit

Yeah shouldn't be an issue. 93 here has 10% E anyways so my tunes probably fine to run it almost dry and switch the map and fuel. Come winter the E drops to E70 so you're even closer.

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13 370z-

phunk

Exactly, its not that sensitive. Just for the sake of seeing the actual difference, lets look at some math:


Say you make the switch with 3/4 a gallon of E10 gasoline left in the tank...

In the tank you have:
0.075 gallon ethanol
0.675 gallon gas

You add 18 gallons (it should take more like 18.5) of E78 (just a random typical "e85" pump content):

You just added:
14.04 gallons ethanol
3.96 gallons gas

You now have in the tank:
14.115 gallons ethanol
4.635 gallons gas

With a total 18.75 gallons in the tank:
14.115 Ethanol / 18.75 total = .7528%

You have E75 in the car. This will not be a critical difference from E78.

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LukasC

Exactly!!! And if u really want to u can make a custom map for 50/50 so if u have to fill up with 93 at before a long drive u dont have to waste the half tank in there by driving around till E

dmhenderson

Don't mind me, I'm just paranoid.

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TopgunZ

Or you can go to your local track with a gas container and get E98 for $4/gal and then add in the difference to bring you into the safe range. Ive done this for a road trip once.

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