racerxrick

same here adwolfe...looking forward to the responses.

JDS968

I thought most stations were running E10 by now, certainly every station in South Florida that I've seen...but I'm pretty sure they're legally required to label it as such.

333pg333

There's a few threads in here about E85. Worth doing a quick search and you'll find your answers.

TurboTommy

The extra octane of the 93 will easily make up for the slightly leaner air/fuel; and most of us are running too rich for max power anyway (although I wouldn't count on it for sure, unless you have a wideband), so I say it's all good.
One thing I always say one should have as part of your equipment is a wideband and an adjustable fuel pressure regulator; two simple things that greatly enhance your control.

ehall

It's not a problem at all. Do a search online and you'll find the purpose of the ethanol.
ps, the mirror glass is on the way.

ehall

correct.

alxdgr8

We've had 93oct E10 for as long as I can remember in Indiana...never had a problem with it. Now switching from 93 to 91oct in my S4 as I've moved west it doesn't like too much. Knocked a little going uphill under boost the first time until the computer pulled timing. Now it's back to normal, but feels a tad slower.

Rogue_Ant

The AFR difference with 10% ethanol is ~4%. Moving the FQS to position 1 should be appropriate, as position 1 adds a little bit over 3%.


-Rogue

toddk911

I was going to let Rogue handle the E85 quesitons as he is an expert in E85 tuning.

Short answer, in a stock set up there is only so much to be gained, but at a minimum you would need a chip for it and bigger injectors to handle the increased fuel that is needed, due to E85 have a much lower stoich. IIRC you need to run about 20-25% richer than standard fuel. Also, the agreement seems that the octane is about 105.

So it is a cheap, and in most states now, readily available "race gas".

Again, defer to Rogue or the E85 threads.

racerxrick

my thought is that with a stock turbo and injectors I'm already optmized for 93 (16-18 pounds of boost and runs excellent!)...I don't see any advantage switching to e85 at this time.

Rogue_Ant

E85 will make more power for the same boost, and be safer. However, you must be tuned for it, and stock injectors aren't going to cut it...

Willard Bridgham 3

The energy density of ethanol is lower than gasoline, ie, less btu/gallon. It also makes the octane higher and makes detonation less of a problem.

toddk911

E85, I think, was invented for those of us that just always need more!!!! LOL

If I was on a stock turbo/set up I would still run e85 if I had easy access to it. It is much safer (running on race gas), plus even the stock turbo is capable of a lot more boost down low and mid range, just runs out of steam up top.

So you could run 20-25psi down low and a lot of timing for super spool up and then boost would roll off up top and e85 would safely allow that. Even if you kept 16-18psi you could then run a lot of advance which would give a lot better off boost/spool up gain, all safely done with e85

JDS968

Are you saying you can make more power because of more aggressive timing? Because my understanding was that the normal way to get more power out of E85 is to turn the boost up and, if necessary, switch to larger injectors.

Ronin-951

I'll let R-A handle the performance issue also, but the long term problem is the fouling it produces. Heaven forbid you dont drive your car for a month, as it dries and settles, a fine white residue is left behind and it takes a lot of 1/10 sec in a lap to clean it up. Been running it as Winter gas in the Northwest for years and I now buy 'Seafoam' by the case. Dont get me started-I'm packin.