Ethanol blend - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
User Tag List

 
LinkBack Thread Tools
post #1 of 5 (permalink) Old 01-22-2017, 02:47 PM Thread Starter
Learners License
 
Join Date: Aug 2014
Location: Madrid(Spain)
Posts: 27
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Groans: 0
Groaned at 1 Time in 1 Post
iTrader: 0 reviews
Question Ethanol blend

What's the maximum ethanol blend the ECU can handle? some guy from Versatune told me is E15(15% ethanol).
Gokemon is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 01-23-2017, 08:34 AM
Lowspeed

 
TiGraySpeed6's Avatar
 
Join Date: May 2008
Location: Tallahassee
Posts: 6,280
Mentioned: 170 Post(s)
Tagged: 2 Thread(s)
Quoted: 621 Post(s)
Thanks: 2,451
Thanked 3,289 Times in 2,156 Posts
Groans: 1
Groaned at 8 Times in 8 Posts
iTrader: 2 reviews
Presuming that the e85 is really e85, not seasonally blended down to e70 or sometimes even lower, as is often the case here in the US, and that the pump is e10, again not seasonally blended

In a speed6, with a 16 gallon tank, I would not exceed 2 gallons of e85, and really less is better- one gallon of e is enough to feel things smooth out and to troubleshoot KR issues, 1.5 gallons, or if really needed up to 2 gallons of e85 for more additional troubleshooting but not for daily driving.

considering 16 gallons and true e85 & e10
p - e = %
16 - 0 = 10%
15 - 1 = 15%
14 - 2 = 19%
13 - 3 = 24%

Due to the extra O2 that e85 brings to the party once you reach 2+ gallons you need to tune for the specific ratio being targeted- that is, you need to tell the ECU what the new Fuel Specific Gravity (FSG) is so that Stoich can be properly maintained. Without making that adjustment to the fuel tables the car will run lean.

Since ethanol, simply as an additive, does not make power, rather you actually lose power, the only common reason for running it with an untuned ECU is for troubleshooting knock, typically to verify if really an ignition issue or an actual hardware noise issue seen as knock by the ECU- with e the symptom will clear up if ignition issue, but if hardware there will be no change to symptom.

Hope that helps.
Also- isn't this just a refresh from the same conversation two years ago?

Sold 7/2016- Mazdaspeed6 GT #3476 TiGray slicktop, fully bolted & badass

1and1
135i - E82.N54 2009 BSM - MHD S1+ / xHP S3 / PR CP & IC / RB PCV / Borla
. . . . RSFI, Koni & Eibach, Dinan CP's & M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's
TiGraySpeed6 is offline  
post #3 of 5 (permalink) Old 01-23-2017, 03:31 PM Thread Starter
Learners License
 
Join Date: Aug 2014
Location: Madrid(Spain)
Posts: 27
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Groans: 0
Groaned at 1 Time in 1 Post
iTrader: 0 reviews
Quote:
Originally Posted by TiGraySpeed6 View Post
Presuming that the e85 is really e85, not seasonally blended down to e70 or sometimes even lower, as is often the case here in the US, and that the pump is e10, again not seasonally blended

In a speed6, with a 16 gallon tank, I would not exceed 2 gallons of e85, and really less is better- one gallon of e is enough to feel things smooth out and to troubleshoot KR issues, 1.5 gallons, or if really needed up to 2 gallons of e85 for more additional troubleshooting but not for daily driving.

considering 16 gallons and true e85 & e10
p - e = %
16 - 0 = 10%
15 - 1 = 15%
14 - 2 = 19%
13 - 3 = 24%

Due to the extra O2 that e85 brings to the party once you reach 2+ gallons you need to tune for the specific ratio being targeted- that is, you need to tell the ECU what the new Fuel Specific Gravity (FSG) is so that Stoich can be properly maintained. Without making that adjustment to the fuel tables the car will run lean.

Since ethanol, simply as an additive, does not make power, rather you actually lose power, the only common reason for running it with an untuned ECU is for troubleshooting knock, typically to verify if really an ignition issue or an actual hardware noise issue seen as knock by the ECU- with e the symptom will clear up if ignition issue, but if hardware there will be no change to symptom.

Hope that helps.
Also- isn't this just a refresh from the same conversation two years ago?
Nope I don't use E85 I use E15 which is the only avaliable at my local pump right now.
Gokemon is offline  
Sponsored Links
Advertisement
 
post #4 of 5 (permalink) Old 01-23-2017, 03:49 PM
Registered User
 
b1lk1's Avatar
 
Join Date: Sep 2015
Location: Lindsay, Ontario
Posts: 941
Mentioned: 39 Post(s)
Tagged: 2 Thread(s)
Quoted: 312 Post(s)
Thanks: 36
Thanked 82 Times in 77 Posts
Groans: 20
Groaned at 2 Times in 2 Posts
Garage
iTrader: 0 reviews
Regular fuel is already blended 5%-15% depending on where and from who you buy it. Most gas in Canada is 10%, but you can find places with 91octane+ that they say is ethanol free.

Gasoline is stepped on hard in North America, always assume you're running 10% unless you have a REALLY trustworthy source.

2004 Mazda 6s 3.0 5dr. 5spd never ending money vacuum project:
CP-E headers w/catted mid + Magnaflow carback/AEM CAI/3.7L TB/Speed6 springs/RX-8 wheels
AWR 70D Enginemount/CP-E Dogbone/Custom urethane stock trans mount
Ralco shortshifter/Bose w/Auxmod/sharkfin antenna/lots of little things...
b1lk1 is offline  
post #5 of 5 (permalink) Old 01-28-2017, 01:11 PM Thread Starter
Learners License
 
Join Date: Aug 2014
Location: Madrid(Spain)
Posts: 27
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Groans: 0
Groaned at 1 Time in 1 Post
iTrader: 0 reviews
Here is Spain RON 95 gas has a maximum of 5% of ethanol by volume and 2,7% of oxygen by volume.RON 98 gas has no ethanol.E85 is not avaliable in most pumps like E15 which also is not very avaliable.In comparisson France has E10 in mostly all the country with E85 also in majority of pumps over the country.
Gokemon is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome