Paulyy

One of my local fuel station sell 100 Octane E10 for the same price as 98 RON.
I filled up my car with it and it obviously drove okay. But when i drove it for a few hours i noticed the AFR's went leaner so i bumped it up 5% and it went to around 14:1 - 12:1.
would anyone recomend keep using it or stick to 98 Octane,

What are your thoughts on this fuel?

BTW we do have 95 E10 and 100 E10.

kev951

heres the deal, you need to find gas that has a stoichiometry closest to 14.7 , all unleaded race gases are usually 14.0 or 13.6 , and most leaded are closer to 14.7. - regular pump gas is 14.5-14.7

so what does that mean?

you need to richen up your mixture a bit to get the combustion correct when using unleaded race gas,
stoichiometry and AFR can get confusing, especially when you are using gas that has additives and such that change the stoichiometry point.

Paulyy

i get where you're coming from. i know that the E10 mixture is stoich at 14.1 but it was a little od when my WBo2 said 15.9.
but theres not much other info about it.

333pg333

Your mix is going leaner as it needs more of the Ethanol to burn. So you have leaned out your octane rating without increasing the fuel. Also perhaps there's some % variation of the amount of ethanol in the mix. You could be getting perhaps 15%?

Black51

Do you guys in Australia have much for E85 stations yet?

TurboTommy

Is this 100 octane R+M/2?
Or is this just 100 RON?

Paulyy

pretty sure its 10% ethanol, as that was it said on the pump.

yeah we've got 11 in Melbourne where i am and also 11 in sydney where Patric is. but the winter fuel for most stations will be 75% ethanol in the caltex stations and aparently in the United stations they measured up to 95% ethanol. read that Here

Just RON. i cannot find a R+M/2 Rating you guys use.

333pg333

Thanks for that link Pauly. Interesting reading. I've been using the United E85 for a couple of years. It might explain a few times when by accident I've boosted to over 2 bar and not heard a peep audibly such as pinging?
The inconsistencies in blend was what I was alluding to regarding just how much ethanol you were seeing in that E10. Perhaps you were getting E20?

333pg333

Oh, btw I am going to have one of these Ethanol content sensors installed which can then be wired up to the ECU to alter mapping based on what it reads.

http://www.zeitronix.com/Products/ECA/ECA.shtml

Paulyy

i must of mis understood you, there might have been ~15% ethanol in the blend. i didn't think much of there being more ethanol in the E10 blend as there has been in the E85 blend. 5% fuel feels alot for 10% ethanol.

from reading what i found on E85 in aus, what comes to my mind is the Caltex E85 with 10% less in winter. They say they have this deal going on with Holden with their VE series II running Bio Ethanol E85 but then thinking.. in winter when they have that 10% less how does the engine handle that, it would be running richer and thinking it would cause starting/cold idle issues with the richness. or the 10% wont make a difference. unless they have some sort of divice that can read how much ethanol in the mixture then increase/decrease the mixture by X amount

EDIT: patric i just seen that 2nd post

JohnKoaWood

Flex fuel vehicles use the ethanol content sensor to do just that.. it measures the ethanol content, and alters the timing and fueling maps to compensate...

The latest stand alone systems are now offering this capability... because of the tuning potential of E85 coupled to the availability...

Paulyy

Thanks for that info john. clears alot up.

Edit: Noted patrics post