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[info][opinion] e85



I have read so much information over the years about ethanol it hurts to talk about it anymore. I can find a site that contradicts another site, US department of Energy, iowa renewable fuels, lab tests the list goes on. There are sources that say the blend varies from 70-79% ethanol then sites that say it's 51-84% ethanol. U.S. government sources that say it has a 100-105 AKI octane rating then other sources/agencies that say 104-109 AKI. I could have sworn I read/heard it somewhere years ago that it is a requirement to post the minimum octane. Seeing so much information and valid resources contradict each other is not easy to sift through.

I have a thread I created a year ago with sources at that time: http://www.grandprixforums.net/e-85-thread-49124.html

Ethanol 113 octane-
Iowa RFA

E85 octane ratings-
Iowa RFA
Iowa RFA
http://www.ethanolrfa.org/page/-/rfa-association-site/pdf/RFAE85FUELETHANOL090301.pdf?nocdn=1

http://iqlearningsystems.com/ethanol/downloads/Racing Fuel Characteristics.pdf

This one kinda wraps all the findings together- (shows a ron+mon/2 where the number could be 96 to 112... lol)
http://growthenergy.org/images/reports/avl_ethanol_sparkignition.pdf

Table 3.3. Ethanol and gasoline octane numbers.
Property Ethanol Gasoline
RON 102-130 90-100
MON 89-96 80-92
(RON+MON)/2 96-112 85-96
Blending RON 112-120 90-100
Blending MON 95-106 80-92
 
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I notice a lot of that is for Iowa though so would it be valid in other parts of the country?

Plus, another thing I have yet to get any conclusive evidence of, is what gas the ethanol is blended with. At first, I figured if you just take the AKI rating of ethanol, figure out the octane of the blended fuel, find the actual blend of the e85 and do the math to figure it out. But NOWHERE can I find what fuel they blend the ethanol with. so they could be very easily blending it with like an 80 octane. Or, it could be the 87... So there is just too many variables that are just unknown to have a 100% conclusive answer. The reason I support the ~96 octane over the higher one is that it there seems to be more scientific baking for it (and my roomate did a project on it for chemistry and I used a bunch of his research that I cant find on the net honestly).

So I guess its really just a mystery lol :/
 
gtpsleeper said:
I notice a lot of that is for Iowa though so would it be valid in other parts of the country?

Plus, another thing I have yet to get any conclusive evidence of, is what gas the ethanol is blended with. At first, I figured if you just take the AKI rating of ethanol, figure out the octane of the blended fuel, find the actual blend of the e85 and do the math to figure it out. But NOWHERE can I find what fuel they blend the ethanol with. so they could be very easily blending it with like an 80 octane. Or, it could be the 87... So there is just too many variables that are just unknown to have a 100% conclusive answer. The reason I support the ~96 octane over the higher one is that it there seems to be more scientific baking for it (and my roomate did a project on it for chemistry and I used a bunch of his research that I cant find on the net honestly).

So I guess its really just a mystery lol :/
Click to expand...

I have always heard the blender pumps (for like e10, e15, e30 etc) use 87 mixed with e100 or e85
 


gtpsleeper said:
I notice a lot of that is for Iowa though so would it be valid in other parts of the country?

Plus, another thing I have yet to get any conclusive evidence of, is what gas the ethanol is blended with. At first, I figured if you just take the AKI rating of ethanol, figure out the octane of the blended fuel, find the actual blend of the e85 and do the math to figure it out. But NOWHERE can I find what fuel they blend the ethanol with. so they could be very easily blending it with like an 80 octane. Or, it could be the 87... So there is just too many variables that are just unknown to have a 100% conclusive answer. The reason I support the ~96 octane over the higher one is that it there seems to be more scientific baking for it (and my roomate did a project on it for chemistry and I used a bunch of his research that I cant find on the net honestly).

So I guess its really just a mystery lol :/
Click to expand...

84.5 octane is common.
 
i would love to switch over but there is no where i mean no where in my area that even sells it, i didn't know anything about it until i came on this forum
 
JoRoW99 said:
Theres a rumor somewhere around me is going to start selling E98? FTW!
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they put a pump in here in Lawrence only problem is with the drought the owner wont be putting any in for a while.... such a cock tease to see an e100(98) button next to the e85 when I fill up...
 


Today marked the first day I actually had a small issue with e85. They switched to the winter/fall blend this week I guess; therefore, my wideband is reading around 10.2 (Calibrated for gas obviously) under WOT o.O! Need to break out HPTuners monday and get this baby running again. Amazing how much power is lost due to too much fuel... The butt dyno noticed before the eyes saw the wideband lol
 


really? Ive never noticed that huge of a change (AFR wise) when they switch here... last winter I had to take 2* of timing away at wot but that was really it as far as changing the tune and stuff.
 
Yeah, IDK what happened. One day I was running perfect, next day I fill up on the way to school, do a pull for the heck of it and im sitting at 10.2 afr :confused:. At first I figured the computer was learning fuel trims or something stupid, but it didnt go back to normal after a week and I was sick of seeing KR at the top end again. Tuned it, works great now.
 
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