Welcome to the North American Subaru Impreza Owners Club Thursday July 10, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 09-06-2012, 06:26 PM   #1
sc00ter
Scooby Guru
 
Member#: 117767
Join Date: Jun 2006
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
2011 STI Sedan
DGM

Default Adding 1-2 gallons of e85 when filling up on 91oct tune. Downsides?

I apologize if this is in the wrong section. I was planning on putting it in the engine management/tuning section but it didn't really fit there.

......

I am dyno tuned for 19psi on 91 octane, which is the highest octane rating I have readily available near me (aside from e85).

I have been juggling around the idea of occasionally throwing in 1-2 gallons of e85 when filling up with 91 for a little extra punch. I am planning on doing this when going on mountain cruises once every month or two. However, I'm curious as to what the downsides would be. I know in the long run e85 causes corrosion but would this cause issues with my drive ability since I'm not tuned for it?

I've sent an email to my tuner regarding this but haven't heard back in a few days so I figured I'd ask here as well since the cruise I'm planning on doing this for is in 2 days.

Thanks for any feedback.
* Registered users of the site do not see these ads.
sc00ter is offline   Reply With Quote
Old 09-06-2012, 07:34 PM   #2
LBell05STI
Scooby Newbie
 
Member#: 305890
Join Date: Jan 2012
Chapter/Region: NWIC
Location: Tacoma, Wa
Vehicle:
2005 STI
WRB

Default

This will do bad things. It will not be a performance gain due to the fact you are tuned for 91. Also considering E85 uses on average 30% more fuel to run it would lean out your AFR if I'm not mistaken. In short, don't do it unless you want a reason to build a new block.
LBell05STI is offline   Reply With Quote
Old 09-06-2012, 07:38 PM   #3
HinshawWRX
Medium Frank
Moderator
 
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

Default

You'd be MUCH better off (safer) to find a station that has race gas then doing E85.
HinshawWRX is offline   Reply With Quote
Old 09-06-2012, 08:11 PM   #4
LBell05STI
Scooby Newbie
 
Member#: 305890
Join Date: Jan 2012
Chapter/Region: NWIC
Location: Tacoma, Wa
Vehicle:
2005 STI
WRB

Default

Regardless of what he does he isn't tuned for it. You will see very MINIMAL gains if any.
LBell05STI is offline   Reply With Quote
Old 09-07-2012, 12:14 AM   #5
Strider327
Scooby Specialist
 
Member#: 131280
Join Date: Nov 2006
Chapter/Region: BAIC
Location: Northern California Hayward
Vehicle:
2004 Impreza WRX
WRB

Default

You'll run lean basically. That's all, no benefits.
Strider327 is offline   Reply With Quote
Old 09-07-2012, 12:41 AM   #6
07wrx84
Scooby Specialist
 
Member#: 252195
Join Date: Jul 2010
Chapter/Region: RMIC
Location: Da-Boonies... 801
Vehicle:
07 WFC #900
@ 451awhp-404awtq

Default

Just go get tuned for E85 and be done lol!
07wrx84 is offline   Reply With Quote
Old 09-07-2012, 12:56 AM   #7
Strider327
Scooby Specialist
 
Member#: 131280
Join Date: Nov 2006
Chapter/Region: BAIC
Location: Northern California Hayward
Vehicle:
2004 Impreza WRX
WRB

Default

Quote:
Originally Posted by 07wrx84 View Post
Just go get tuned for E85 and be done lol!
^ This! You might not even want to go back to gas once your on E85! I wish there were more stations around though seriously.
Strider327 is offline   Reply With Quote
Old 09-07-2012, 01:34 AM   #8
RallySport Direct
NASIOC Storefront Vendor
 
Member#: 33174
Join Date: Feb 2003
Chapter/Region: RMIC
Location: Salt Lake City Utah
Vehicle:
We are Open Late!
888-457-2559 Every day!

Default

E-85 has less energy than normal fuel, which is why on an E-85 tune you have to run huge injectors and tons of fuel, but it does have an extremely high resistance to detonation/knock so you can run more boost, more timing as long as you dump in enough fuel. Running E-85 with normal fuel would actually be a downgrade, yes your "octane" would go up, but you are getting less energy out of the mix. It would be more ideal to run a water/meth kit, that way you are adding more chemicals in addition to your normal fuel. But in short, don't add E-85 to your fuel

Thanks,
Rick
RallySport Direct is online now   Reply With Quote
Old 09-07-2012, 01:51 AM   #9
07wrx84
Scooby Specialist
 
Member#: 252195
Join Date: Jul 2010
Chapter/Region: RMIC
Location: Da-Boonies... 801
Vehicle:
07 WFC #900
@ 451awhp-404awtq

Default

Quote:
Originally Posted by Strider327

^ This! You might not even want to go back to gas once your on E85! I wish there were more stations around though seriously.
I'll never go back to pump unless I have to!
07wrx84 is offline   Reply With Quote
Old 09-07-2012, 12:44 PM   #10
StealthTL
Scooby Newbie
 
Member#: 206912
Join Date: Mar 2009
Chapter/Region: International
Location: Waaaaay North
Vehicle:
2006 Forester XT
DGM

Default

The more E85, the less energy per c.c. - you are dangerously lean right now, and you got away with it.

Don't push your luck further.....
StealthTL is offline   Reply With Quote
Old 09-07-2012, 01:16 PM   #11
Paidfor
Scooby Specialist
 
Member#: 267815
Join Date: Dec 2010
Location: Workn on my LSX swap
Vehicle:
Be in awe
dont hate .)

Default

The fuel we get here in the south is already "10 % max ethanol"....or thats what all the pumps are marked with anyways. If thats right then that would mean 1 whole gallon of ethanol per 10 gallons purchased ? Thats seems like alot but must be safe to some sort of a degree or it would screw up whatever you put it in...right? Hell i dont know, i wouldnt add 2 or 3 gallons per fill up tho thats for sure. Like they all said above, its take so damn much of it in comp to gasoline. It would be ridiculous to use 100% eth unless you got access to a sheetload of it. I couldnt tell you where to get some around here, never seem a station that offered it.
Paidfor is online now   Reply With Quote
Old 09-07-2012, 03:43 PM   #12
sc00ter
Scooby Guru
 
Member#: 117767
Join Date: Jun 2006
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
2011 STI Sedan
DGM

Default

Thanks for all the feedback guys. I'm definitely going to avoid it. My tuner responded back saying essentially the same thing you guys did. Not at all worth the risks.

Quote:
Originally Posted by 07wrx84 View Post
Just go get tuned for E85 and be done lol!
I considered this when getting tuned after the turbo upgrade but the general consensus was that e85 isn't that readily available around me and it doesn't run well in the winter here where it can get to 20 degrees or lower consistently.

Quote:
Originally Posted by StealthTL View Post
The more E85, the less energy per c.c. - you are dangerously lean right now, and you got away with it.

Don't push your luck further.....
What are you talking about? I haven't done it yet.


Anyway, thanks for the replies everyone.
sc00ter is offline   Reply With Quote
Old 09-07-2012, 05:59 PM   #13
424wrx
Scooby Specialist
 
Member#: 171948
Join Date: Feb 2008
Chapter/Region: Tri-State
Location: new york
Vehicle:
08 wrx vf52,stg3
11 forester,14 legacy dd

Default

my buddy though it was a good idea to try some e85 in his yamaha yz 426 dirt bike. it didnt go well. it wouldnt run and he had to drain out the tank and lines. if it were available more i maybe would run it in my car. there is only one station that sells it in the whole county.
424wrx is offline   Reply With Quote
Old 09-07-2012, 10:33 PM   #14
07wrx84
Scooby Specialist
 
Member#: 252195
Join Date: Jul 2010
Chapter/Region: RMIC
Location: Da-Boonies... 801
Vehicle:
07 WFC #900
@ 451awhp-404awtq

Default

Quote:
Originally Posted by 424wrx
my buddy though it was a good idea to try some e85 in his yamaha yz 426 dirt bike. it didnt go well. it wouldnt run and he had to drain out the tank and lines. if it were available more i maybe would run it in my car. there is only one station that sells it in the whole county.
Lol duh!
07wrx84 is offline   Reply With Quote
Old 09-08-2012, 12:19 AM   #15
StealthTL
Scooby Newbie
 
Member#: 206912
Join Date: Mar 2009
Chapter/Region: International
Location: Waaaaay North
Vehicle:
2006 Forester XT
DGM

Default

What are you talking about? I haven't done it yet.


My bad, mis-read the original, thought you were doing it regular.
StealthTL is offline   Reply With Quote
Old 09-08-2012, 02:34 AM   #16
Concillian
Scooby Guru
 
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:
2002 WRX Sedan
Midnight Black

Default

Read the E85 FAQ here: http://forums.nasioc.com/forums/showthread.php?t=803341

The guy who wrote that ran E85 blend on the stock ECU for years before converting to E85 and re-tuning. There is significant benefit to be had from mixing E85 on a stock ROM due to leaning out the stock richness in the open loop fuel map.

If you're tuned for 91, however, it's obviously not a good idea, as that has already tuned out the stock richness. It depends how they did the tuning how bad it would be. If they moved the ariflow ranges of the trims so OL fuel map isn't affected by the trims it would be worse than if they left the trim ranges alone.
Concillian is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 03:21 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.