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Question E85 Fuel Percentage - 09-15-2016, 04:21 PM

Hi everyone,

I just installed the FF wires for my N55 335i and I want to know how to mix E85. If I wanted to do 30% of my total 16.1 gallon tank is it as easy as adding 5 gallons of e85? Or is there some sort of math equation I have to do?? I don't wanna mess up my car so I've been holding off on this.

Many Thanks,

Kenneth
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Rob_BMW_PNW Rob_BMW_PNW is offline
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Default 09-15-2016, 04:45 PM

You must have been bad at fractions and you also answered your own question, but:

5/16 * .85 = E26.5

Unless your pump gas has 10% in it then add:
11/16*.10 = E6.87

= ~ 33%

If you are lazy:
https://www.intercepteft.com/calc.html
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Default 09-15-2016, 04:45 PM

Use this.

http://www.intercepteft.com/calc.html

It is best to start low with your mixtures, log, then up the mixture. Depending on the amount of boost you are running you should be able to get away with E30-40 on the stock fuel system. I would start with E20 and log first.


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LycanX4M40i LycanX4M40i is offline
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Default 09-15-2016, 08:33 PM

Quote:
Originally Posted by Bimmer_Boost
Use this.

http://www.intercepteft.com/calc.html

It is best to start low with your mixtures, log, then up the mixture. Depending on the amount of boost you are running you should be able to get away with E30-40 on the stock fuel system. I would start with E20 and log first.
+1
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Default 09-21-2016, 09:35 AM

Thanks guys for the reply I went ahead and used the calculator but I'm confused. I used the two different calculators and got different results. Here check out the pic








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Default 09-21-2016, 09:37 AM

I only use the lower calculator.


2011 E92 335i Auto | 0-60=3.6 | 11.7@125MPH SOLD
2014 E84 X1 35i | 0-60=4.55 | 12.75@107MPH | VRSF CP | BMS Intake | Custom MHD Tune | VRSF 7" Intercooler | ER Turbo Outlet | XHP Stage 3 | Pure Stage 2 V3 | Pure Inlet | DV+ | AR DP | AEM Methanol Injection
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Default 09-21-2016, 09:42 AM

Okay yea the lower one is straight forward and is how I imagined it being...the top one is like wtf? I live in california how do I know if my 91 has 10% ethanol though??? Do I ask the guy inside...either way it looks like the safe zone is 5-6 gallons of e85 then the rest 91. I won't nit pick exactly e30 since the JB4 auto detects.
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Default 09-21-2016, 09:52 AM

I think someone from California will have to chime in. I know in Oregon every pump has E10 unless stated otherwise.


2011 E92 335i Auto | 0-60=3.6 | 11.7@125MPH SOLD
2014 E84 X1 35i | 0-60=4.55 | 12.75@107MPH | VRSF CP | BMS Intake | Custom MHD Tune | VRSF 7" Intercooler | ER Turbo Outlet | XHP Stage 3 | Pure Stage 2 V3 | Pure Inlet | DV+ | AR DP | AEM Methanol Injection
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Default 09-21-2016, 10:35 AM

okay yea doing some research and california doesn't have to state if it has ethanol in its pump gas lol ****ing cali
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Default 09-21-2016, 10:46 AM

I only use the top calculator. And I'm pretty sure that all pump gas in the US is E10 unless its for marine or aero use.


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Default 09-21-2016, 10:52 AM

"Under the Renewable Fuels Standard passed in 2007, the Federal government requires certain volumes of ethanol to be blended into the U.S. transportation fuel supply.

However, states have discretion as to how much (or how little) ethanol goes into fuels sold within their borders.

And it turns out that relatively few states are doing much to encourage the sale of greater amounts of ethanol.
"


2011 E92 335i Auto | 0-60=3.6 | 11.7@125MPH SOLD
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LycanX4M40i LycanX4M40i is offline
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Default 09-21-2016, 12:38 PM

I agree with Bimmer_Boost I use the lower one too , the other one you forgot to input the 10% of Ethanol in your gas tank prior
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Default 09-22-2016, 10:54 AM

Have you considered getting an ethanol sensor and analyzer from Fuel-It?
http://www.fuel-it.biz/ethanol-analyzer-options/




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Default 09-22-2016, 12:45 PM

In the first calculator you forgot to put the 11.1 gallons of E10 in there. That is why they are different.
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Default 09-23-2016, 03:02 AM

I will start trying using Sunoco E85 soon ...



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Default 09-29-2016, 08:48 AM

Quote:
Originally Posted by suchtragedy
Have you considered getting an ethanol sensor and analyzer from Fuel-It?
http://www.fuel-it.biz/ethanol-analyzer-options/
This is a really cool product, especially for 150.

To the OP, just to confuse you further and prove why I would buy a sensor like above-

1) Regular fuel can contain up to 10%, but doesn't have to. It could be 0. Their call.

2) Fuel blends will vary based on if it is a summer or winter blend. Yes, there are different blends. Summer is cleaner burning and more expensive.

3) e85? ha ha try, e50-e90 at most places depending on what is most economical for them to provide at the time. You never know exactly what it will be at most stations.
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Default 09-29-2016, 09:24 AM

Quote:
Originally Posted by gungriffin
This is a really cool product, especially for 150.

To the OP, just to confuse you further and prove why I would buy a sensor like above-

1) Regular fuel can contain up to 10%, but doesn't have to. It could be 0. Their call.

2) Fuel blends will vary based on if it is a summer or winter blend. Yes, there are different blends. Summer is cleaner burning and more expensive.

3) e85? ha ha try, e50-e90 at most places depending on what is most economical for them to provide at the time. You never know exactly what it will be at most stations.
1. Pump gas in the US is required to have 10% ethanol.
3. Anything labeled E85 is required to be at least E70 (which it is in winter).


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Default 09-29-2016, 01:35 PM

Quote:
Originally Posted by Mike_L
1. Pump gas in the US is required to have 10% ethanol.
3. Anything labeled E85 is required to be at least E70 (which it is in winter).
Question regarding point 3....

I am now seeing the E85 label with a "Minimum 51%" logo as subtext. I cannot seem to find good information on the federal requirements for this fuel class including any relevant "octane" data. Do you have any knowledge on that front?


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Default 09-29-2016, 01:47 PM

I've never seen that. Is it marked as E51? Proper E85 is 105 octane AKI.


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Default 09-29-2016, 02:10 PM

This is what Steve got from the pump.

Name:  E mix.jpg
Views: 325
Size:  116.8 KB


2011 E92 335i Auto | 0-60=3.6 | 11.7@125MPH SOLD
2014 E84 X1 35i | 0-60=4.55 | 12.75@107MPH | VRSF CP | BMS Intake | Custom MHD Tune | VRSF 7" Intercooler | ER Turbo Outlet | XHP Stage 3 | Pure Stage 2 V3 | Pure Inlet | DV+ | AR DP | AEM Methanol Injection
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Default 09-29-2016, 02:38 PM

If the pump said E85 and I got E57, I wouldn't be calling Torco, I'd be calling the company who's station it was and then the Feds.


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Default 09-29-2016, 03:22 PM

The Sunoco I use here says minimum 70%. If I were to ever get a reading below that Id be like Mike and calling the Feds.

So far the lowest it has been when I checked was 78. 90% of the time its spot on 85.
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Default 09-29-2016, 03:22 PM

Quote:
Originally Posted by Mike_L
I've never seen that. Is it marked as E51? Proper E85 is 105 octane AKI.
I need fuel tomorrow so I'll be sure to snap a pic and post it up.


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LycanX4M40i LycanX4M40i is offline
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Default 09-30-2016, 05:57 AM

Quote:
Originally Posted by Mike_L
If the pump said E85 and I got E57, I wouldn't be calling Torco, I'd be calling the company who's station it was and then the Feds.
THey meant to say to call Torco for E98 meaning PURE lol.

And yes although pump says E85 minimum E70, there's been showing lately E70 even in the summer aka Gulf stations are known for this. This is why a lot of people have to test before pumping now.

As of late, September I've tested E80 at all long island stations and E85-E88 in NJ. I've already filled up 13gals of jugs when i see the content is e85 or higher
Hopefully they vary cuz thats what it seems to be, go back to our Valero and test it before.

Last edited by LycanX4M40i; 09-30-2016 at 06:15 AM..
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Default 09-30-2016, 06:36 AM

There is also this app that I made for mobile that works pretty good


E85 Calculator for Mobile Android iPhone
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