E100 vs 99.7% ethanol
 

E100 in pump stations is mix of 2% unleaded gas plus 88% pure Ethanol. it's name is denatured ethanol because you can not drink it.

I have no access to E100 or E85 from pump station because in my country there is no ethanol station.

I put pure ethanol (99.7% purity Absolute anhydrous Alcohol C2H5O with no addictive) in my tank.

I shop this ethanol from drugstores and i could drink it.

do you think this ethanol differ with E100?
I ask because i want to be sure this ethanol work with my car without any issue.

I don't really understand what you're after here. Are you attempting to run pure alcohol in a gasoline engine? What tune are you running?

Why not just mix it in the same ratio E100 to be safe? Two things I see that could be potential problems in running home made E100.

1. Seals being damaged by the higher ethanol content. Should be okay short term
2. The lack of a additive package. Fuels contain corrosion inhibitors, stabilizers, detergents to maintain the fuel system and engine while being burnt.

The -OH group undergoes hydrolysis and produces water. Without a proper stabilizer and corrosion inhibitor, you will likely see a rusted gas tank and fuel lines.

What about sacrificing a few HP and run regular gas/meth injection?

I know more about crude oils and less about refined products. Maybe someone else can chime in.

Must be some expensive fuel at however much it must be per volume. The reason it's E85 is because the gasoline acts as a lubricant as well. You often see people recommending occasionally running a tank of 93 even on E85 for a reason. Yes it's different from E100. E100 still has 2% gasoline for a good reason. E85 is pretty often considered safe on our cars, 99.7% with no gasoline and you're venturing into something that people haven't typically tested. It'll burn and run, but longevity and reliability is beyond me.

In for the meltdown, especially without a tune. That stuff is 30-60 dollars a gallon here, how cheap is it there?

i use a ecutek tune from a famous tuner

i shop 1litre 2$

Thanks
I use 93 after 5 tank E100.
some times i put 15% gasoline for longer trips .
just put E100 for shorter trips for street racing

This looks like a good place to ask a sort of related question.
How much ethanol do you need to add to the gas to make it worth tuning for it?
Would say, 20% be worth it or do you need a lot more?

I think the real story here is that you can buy 99.7% pure anhydrous grain alcohol at the drug store in Tehran. I hear the clubs are great there too. Time to book a flight.

70%
 

My tuner say ethanol over 70% is not useful.
but i prefer E100 not for more power because it make it easy to me i just fill ethanol at home in my tank and no need to go to pump station and mixing it.
mixing is not easy task because i exactly do not know how much ethanol is in my tank .
another mixing problem is manually mixing ethanol with gas take a bit longer for completly mixing.

????
 

my english undrestanding is not good.
please share your idea more clear to me
Thanks

Interesting, but it didn't answer my question.

From the fueling point of view, given the wide range of AF error that the ecu can handle, you have a wide range to play with.

From the power tuning point of view, I would think that unless you are going to be tuning it for ethanol, even at low concentrations such as 20% / 30%, there really is no point - since you won't really get much extra power out of it (unless the fuel you currently run is so crap that the stock tune is neutered). Unlike a turbo'd setup, where one could argue that at least some ethanol would result in a cooler, more knock resistant mixture, on an NA engine it's not really an issue.

@diodelphi - why don't you run a flex fuel sensor setup? I have the same issue here (no pump E85), and will install a Zeitronix - that way, given the imprecise nature of home brew mixing of gas and ethanol, you know that the ecu is correctly fueling for whatever the mixture. I think running E99.7 without any of the additives will cause problem in the longer run - potentially expensive problems.