E85 and Ethanol/Methanol. The ins & outs of AFR's

blake

New Member
Apr 25, 2005
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Minnesota
The really short version is: Injectors, Pump, Fuel Trim Device (S-AFC, standalone, whatever).

Details abound, but the crux of it is 1.51 times the fuel for the same amount of air.

Edit: 14.7(gas) / 9.7(e85) = 1.51x fuel
 
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Doward

Banned
Jan 11, 2006
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Alachua, FL
Holy shit! I just found out Lake City (about 30 miles or so north of me) has an e85 station!

Ohhh.... gonna call tomorrow to find out how much per gallon it is, and see if it is economically feasible. If so, I may have to go that route for the Supra (104 octane + PTE67? 20psi no problem on the street? Ohhh baby!)
 

j3pz

still learning
blake;967822 said:
The really short version is: Injectors, Pump, Fuel Trim Device (S-AFC, standalone, whatever).

Details abound, but the crux of it is 1.51 times the fuel for the same amount of air.

Edit: 14.7(gas) / 9.7(e85) = 1.51x fuel

so 720's, a walboro, and a fuel controller will do it? that seems pretty simple or is there more to it than that?
 

figgie

Supramania Contributor
Mar 30, 2005
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ok one thing to keep in mind.

E85 is not for MPG! So if that even crossed your mind. FORGET IT! Now instead high octance gasoline THAN it can be used. But people who use c16 are not to concerned with MPG! ;)

<-- loves Lambda.
 

figgie

Supramania Contributor
Mar 30, 2005
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Twin Cities, Minnesot-ah
CryoSlash;968268 said:
I heard some people only lose 10-20 mpg total, which isn't bad in all reality.


it all depends on the tune and how the engine was built. Meaning if you built the engine with ONLY E85 in mind. Than you might not even lose that much. But that means high compression, lean burning etc. On the stock 8.5:1, we will probably loose a heck of a lot more than that. I mean our cars run fine on 87 octane water ;)
 

MDCmotorsports

Offical SM Expert: Turbochargers
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Mar 31, 2005
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Its gotta be substantially lower John. I used to do a demonstration for people who believed that "alcohol" was the devil's fuel.

I used to put my finger in methanol / ethanol and light it on fire and then proceed to blow it out.

People were amazed at how I wasn't harmed.

It burns, but it doesn't have the "explosive" nature like gasoline does.
 

Poodles

I play with fire
Jul 22, 2006
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I sure hoep you meant a loss of 10-20 miles per TANK, as miles per gallon I'd be in the negatives LOL

Forced induction will really benefit since you'll be able to up the boost a lot more to get the proper cylinder pressures to take advantage of the fuel.

Ask dok33 about it a bit and see what it can do, his damn escort FLIES...
 

pimptrizkit

thread killer
Dec 22, 2005
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vancouver Wa
since the fuel has a higher octane, what would be a safe lean burn for cruse?

i could get 17/18afr with no pinging on 92 pump w/10% ethanol pump, while crusing down the freeway..

i understand it's not for mpg, i just curious for knowlegde.
 

blake

New Member
Apr 25, 2005
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Minnesota
Supposedly the extra cooling effects of the extra fuel mass (or maybe even the thermal properties of the alcohol, I'm not sure) really really help your EGTs, which should be helpful for lean cruise.

Back when I actually drove my car (still stock engine/electronics), I could tell you by the EGT gauge wether or not the tank of gas I was burning was Holiday's "Blue Earth" gasoline (high E content) or normal gasoline. I'm really curious to see what the results are like with E85.