E85 pros and cons versus 93 octane+meth
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
Jeff, I understand that and it fits for 100% gasoline but what I'm asking is how should I tune in HP Tuners for something other than 14.68 100% gasoline? Do I base my math for the PE table off of the new stoich value of my other than 100% gasoline? And secondly, it sounds as if the typical widebands are translating the voltage to a displayed AFR value based off of an assumed 14.68 100% gasoline giving me a false indication of what the AFR really is.
Instructor
Joined: Oct 2002
Posts: 171
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From: Cologne Germany
And what you want to work with is PE. You want it 20% richer than stoichometric, you enter 1.20. (Assuming that everything else is calibrated correctly for the fuel you use)
Till
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Jeff, I understand that and it fits for 100% gasoline but what I'm asking is how should I tune in HP Tuners for something other than 14.68 100% gasoline? Do I base my math for the PE table off of the new stoich value of my other than 100% gasoline? And secondly, it sounds as if the typical widebands are translating the voltage to a displayed AFR value based off of an assumed 14.68 100% gasoline giving me a false indication of what the AFR really is.
Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
Instructor
Joined: Oct 2002
Posts: 171
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From: Cologne Germany
Till
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
9.76/7.45= 1.31
14.7/11.25= 1.306
Its the same percentage change so 11.25:1 on the meter then corresponds to 7.45 with E85. (ethanol actually likes being a bit richer than a gas tune on my car)
Its the same percentage so change the stoic to 9.76 for E85 or 10.63 for E70 and use your wideband as you alway do. With the E85 you will still see 11:1 at WOT no matter what fuel you're running.
The LM-1 from innovate lets you read the actual stoic you want for lambda=1 but I dont do it because when I'm driving around using E20 or E30 or E10, I know when I see 11:1 on my pillar gauge, i'm at the right a/f ratio without having to learn new numbers. Why confuse yourself with seasonal E70 to E85 values when you know what the correct readings would be if it was gas.
Last edited by SpinMonster; Feb 12, 2010 at 06:10 AM.
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Melting Slicks
Joined: Jul 2007
Posts: 2,581
Likes: 15
From: Ohio
I use it, made 1132 rwhp... Aeromotive fuel pumps are compatible.
I race on E98 and drive on E85 no issues so far. Better cooling, cheaper cost (paying ~$3 per gallong for E98) and getting C16 power without killing wideband sensors.
Conversion wasn't difficult.
I race on E98 and drive on E85 no issues so far. Better cooling, cheaper cost (paying ~$3 per gallong for E98) and getting C16 power without killing wideband sensors.
Conversion wasn't difficult.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
What fuel system are you running? Its insane to support that much on E85.
Melting Slicks
Joined: Sep 2004
Posts: 3,153
Likes: 114
on the subject of oil, is anyone worried about washing the bores as you are putting soo much fuel in to make the really big numbers?......
Chris.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Melting Slicks
Joined: Jul 2007
Posts: 2,581
Likes: 15
From: Ohio
My fuel system was designed by IPSMotorsports.net and my motor was built with E85 in mind. The car does run cooler and Oil temps are cooler as well.
I've not had any issues related to the Ethanol.
I've not had any issues related to the Ethanol.
Melting Slicks
Joined: Jul 2007
Posts: 2,581
Likes: 15
From: Ohio
Oil analysis would be needed to see what amount of fuel is getting past the rings but I'd imagine any decent running low mile motor is fine as long as you dont get silly with boost before full thermal expansion at optimum running temperature is reached. More frequent oil changes would be wise in any performance build especially as mileage climbs. Fuel isnt a good lubricant unless we're talking about nitrometh radio controlled cars.
Melting Slicks
Joined: Sep 2004
Posts: 3,153
Likes: 114
Thats very intresting that you see a reduction in oil and engine temps. Maybe E85 is a 'better' fuel than people first think, esp in applications where engine temps can be a real problem!.....
