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Old 02-18-2011, 04:49 AM   #1
blckout7
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Default E85 question

Does anything need to be installed to run e85? Or a straight tune for it will do the trick, I ask because for the first time a gas station near by is offering it and for cheap!

Tuned on 93 octane it's costing me $3.55/gallon

E85 Is $2.49/gallon

I've started reading the e85 thread is it confirmed that it is really a 5% engine power increase on N/As?

Thank you
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Old 02-18-2011, 04:51 AM   #2
SleepinSubie
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Also remember E85 burns twice as fast..
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Old 02-18-2011, 04:53 AM   #3
blckout7
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From what I read in the FAQ it burns 27% quicker, however it takes less throttle for same performance
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Old 02-18-2011, 05:38 AM   #4
xatnys
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Generally speaking you need a fuel pump and fuel injectors. Also, what's already been said is that yes, it will burn faster and you will get less MPG.
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Old 02-18-2011, 07:16 AM   #5
gmullin
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e85 is about 105ish octane, but essentaly your usine ethonal with gas as a lubericant. ethonal is like using a less potent methonal... 100% methonal= 120 octane... 100% ethonal is around 110 octane if i rember correct... when using e85 as a primary fuel make sure you smell test your oil offen ethonal will get in their and ruin the oil
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Old 02-18-2011, 02:20 PM   #6
formula91
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No you do not need anything except a tune that increases your fueling by about 30%. You'll probably need at least a bigger pump. There's a group buy in the classified section for a walbro 255 if you want to go get one.

E85 Stoich: 9.765 AFR
Gasoline Stoich: 14.7 AFR

The math comes out so that you need about 33%-39% (depends on who you ask) more fueling. So just take your fueling chart and multiply everything by 1.33.That's the basics anyway. You'll want to change timing if you want to get the most out of it as well.

What they say is true, it burns "faster," (in ideal conditions, which i assure you an engine is not) but that's a good thing. Burning faster doesn't mean less mpg. Keep in mind ethanol atomizes less easily, so in reality your fuel will probably be burning slower. After all, what does octane stand for? Resistance to knock. The resistance to atomization is the reason for this. What really translates to mpg is the AFR as you see above. You need more fuel per unit of air. Your o2 sensor will see no difference as long as you are stoich, and you'll be fine. If you have a wideband, you can change for the type of fuel. HOWEVER, if you get your timing up, you can minimize MPG loss greatly. More timing means more torque and better gas mileage.

You also do get a SLIIIIGHT power increase. Not much.

http://forums.nasioc.com/forums/showthread.php?t=803341

This thread has everything you need to know.
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Old 02-18-2011, 03:46 PM   #7
blckout7
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Yeah formula that's what I started reading, but unsure if I should switch over to it and then retune, hmm a bigger fuel pump is all I need...
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Old 02-18-2011, 06:33 PM   #8
formula91
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Quote:
Originally Posted by blckout7 View Post
Yeah formula that's what I started reading, but unsure if I should switch over to it and then retune, hmm a bigger fuel pump is all I need...
The thing is, if you take it on a trip and there's no E85 available, you better have your laptop with you. If you have another car for long trips, and stuff, I'd just do it.

I think the 5% increase in power is really an overestimate. You won't feel anything unless you really take advantage of that 105 octane and boost like mad.
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Old 02-18-2011, 07:40 PM   #9
Rudgers73
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Quote:
Originally Posted by blckout7 View Post
Yeah formula that's what I started reading, but unsure if I should switch over to it and then retune, hmm a bigger fuel pump is all I need...

and injectors. Also, do some reading about what E85 can do to rubber and plastic parts...
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