[bmwheath]

Hey guys. So, i always thought i calculator E85 mixes correctly, i know E85 is generally a maximum of 85% ethanol content.
This is how i work it.
Example:
Lets say i want an E50 final mix, and 50 litres in total
20.6 litres of unleaded
29.4 litres of E85 (max 85% ethanol, other 15% is unleaded content)

Now, i was on the Vishnu website and they mention there that if you mix 50% E85 & 50% unleaded that it will make an E60 mix!
Now i can't find how they come to that conclusion, to me that doesn't make any sense.
What on earth am i missing

[Socket]

Scotty is the man to ask. He is the master of E85 calcs

[JJH]

Originally Posted by bmwheath

Now, i was on the Vishnu website and they mention there that if you mix 50% E85 & 50% unleaded that it will make an E60 mix!
Now i can't find how they come to that conclusion, to me that doesn't make sense.
Am i having a blonde moment, what on earth am i missing

I understand that US unleaded already has 10% ethanol, which is why that calculation works that way - for the US guys. I'm sure someone else here has the formula that works for us. I believe there is an app that does the calculations for you based on how much you have to top up your tank.

[bmwheath]

Ah yes!! The 10% ethanol in the US fuel is what is different there!
I also have the E85 calculator on my phone, but i prefer this one http://dbtest.net16.net/ethanol-01.html
as it has 3 different calculators and is so easy to use

[tawfeeqh]

I'm trying to get an ethanol analyser lol
Maybe going over the top but not bad for $199 U.S. They also have another one for $139 U.S. If it works like they claim you'll know exactly what's in the tank at any given time

http://www.zeitronix.com/Products/ECA/ECA.shtml

Justin said his getting some fuelit branded ones but hasn't given a price yet

[DR-JEKL]

Not really needed imo if your premixing with united E85 imo. Well if you're a klutz it might be to ensure you have your ratios correct haha

If you're tuned for E50-E60 just add an extra litre or two to the fulltank fillup ratio to be safe (have a higher than required E ratio).

I can see it being of relevance if your have an at the limit full kill dyno max mode tune running 100% E85 and fill up with eflex where the ratio's vary but most guys state that the united E85 is consistent.

Still having said that it's a cool toy

[tawfeeqh]

Originally Posted by DR-JEKL

Not really needed imo if your premixing with united E85 imo. Well if you're a klutz it might be to ensure you have your ratios correct haha

If you're tuned for E50-E60 just add an extra litre or two to the fulltank fillup ratio to be safe (have a higher than required E ratio).

I can see it being of relevance if your have an at the limit full kill dyno max mode tune running 100% E85 and fill up with eflex where the ratio's vary but most guys state that the united E85 is consistent.

Still having said that it's a cool toy

True - lol. Agree you can get by without the gadget

[JJH]

I came across this formula that suits our fuels:

Target ethanol percentage / 85 x Total number of litres to fill

i.e. E50 target for a 53L fill requires: 50 / 85 x 53 = 31.2L of E85 (and 53 - 31.2 = 21.8L of PULP)

[bmwheath]

Originally Posted by DR-JEKL

Not really needed imo if your premixing with united E85 imo. Well if you're a klutz it might be to ensure you have your ratios correct haha

If you're tuned for E50-E60 just add an extra litre or two to the fulltank fillup ratio to be safe (have a higher than required E ratio).

I can see it being of relevance if your have an at the limit full kill dyno max mode tune running 100% E85 and fill up with eflex where the ratio's vary but most guys state that the united E85 is consistent.

Still having said that it's a cool toy

Or people like me that have there stock hpfp on the limit of E content and dont want it to crash out from slightly to much E85
Unfortunately a E52-55 mix is about my limit, depending on weather conditions lol, so i need to mix precisely if im to get the most E content possible without crashing the hpfp

[bmwheath]

Originally Posted by JJH_335

I came across this formula that suits our fuels:

Target ethanol percentage / 85 x Total number of litres to fill

i.e. E50 target for an empty tank (53L) requires: 50 / 85 x 53 = 31.2L of E85 (and 53 - 31.2 = 21.8L of PULP)

Thats correct for only a 53 litre fill, yes.

[JJH]

That is just an example of how the formula works for a 53L fill. As it is a formula, you just simply change the 'total number of litres to fill' part to suit. So if you need to top up your tank with 40L of E50, your calculations are:

50 / 85 X 40 = 23.5L of E85; and 40 - 23.5 = 16.5L of PULP

[tawfeeqh]

I thought the tank capacity on our cars are 63Lt not 53Lt

[JJH]

Originally Posted by tawfeeqh

I thought the tank capacity on our cars are 63Lt not 53Lt

You are correct - does not change the way the formula works to calculate the E85/PULP proportions for your E target.

[bmwheath]

Awesome, so i know i calculate it correctly. Just the Vishnu website through me off completely, even with the US having 10% ethanol content in there unleaded, i still dont understand how they seem to think that 50% gas & 50% E85 makes E60?? And i thought there E85 was more like E70 on average as well

[135]

Originally Posted by JJH_335

I came across this formula that suits our fuels:

Target ethanol percentage / 85 x Total number of litres to fill

i.e. E50 target for a 53L fill requires: 50 / 85 x 53 = 31.2L of E85 (and 53 - 31.2 = 21.8L of PULP)

Here's my original post.

Originally Posted by bmwheath

Thats correct for only a 53 litre fill, yes.

Originally Posted by tawfeeqh

I thought the tank capacity on our cars are 63Lt not 53Lt

I have a 135i, which has a 53L tank, so my post was based on that. In the formula, just change 53 to 63 (or the value for the number of litres that needs to be filled).

Originally Posted by bmwheath

Awesome, so i know i calculate it correctly. Just the Vishnu website through me off completely, even with the US having 10% ethanol content in there unleaded, i still dont understand how they seem to think that 50% gas & 50% E85 makes E60?? And i thought there E85 was more like E70 on average as well

By my reading, the Vishnu website is wrong. Additionally, my preference is to use the term "ethanol content" rather than "ethanol mixture". For reference, this is what the Vishnu website says:

... when running with an ethanol mixture of at least 60% (approximately 50% E85 and 50% premium grade gasoline).

Since the US has 10% ethanol in their unleaded fuel, therefore, the E60 claim may be based on 10% ethanol in the unleaded fuel is E10 and the incorrect assumption that 50% E85 is E50, which leads to the calculation E10+E50=E60. In fact, the 50/50 E85/unleaded mix equates to E47.5, which is commonly rounded and referred to as E50. At a 50/50 mix, the unleaded fuel would need to contain E35 to result in E60. The alternative is a higher percentage of E85 - a 2:1 E85:E10 mix, i.e. 66.67% E85.

The level of ethanol in US E85 seems to be dependent on season, region and refinery/brand and E50-70 is commonplace, although there are still some instances of consistent E85. This is probably why an ethanol analyser is a useful tool in the US whereas we're fortunate enough to have United E85, which is E85 (and has been measures as high as E88).

[harms]

Just get this. Doesn't get any easier.

https://itunes.apple.com/au/app/e85-...877131777?mt=8

https://play.google.com/store/apps/d...ssel.e85&hl=en

[bmwheath]

Originally Posted by harms

Just get this. Doesn't get any easier.

https://itunes.apple.com/au/app/e85-...877131777?mt=8

https://play.google.com/store/apps/d...ssel.e85&hl=en

Im good thanks bro, i already have this app and another E85 calculator. Just couldn't understand how Vishnu came up with there E85 figures

[Socket]

Originally Posted by harms

Just get this. Doesn't get any easier.

https://itunes.apple.com/au/app/e85-...877131777?mt=8

https://play.google.com/store/apps/d...ssel.e85&hl=en

Downloaded this ... Thanks Scotty

[harms]

Originally Posted by bmwheath

Im good thanks bro, i already have this app and another E85 calculator. Just couldn't understand how Vishnu came up with there E85 figures

I'd suggest you ignore any american calcs. Use the app. United seems to be consistently close to e85. Happy days

[_ink]

I use an app currently.

However Steve from Fuel-it is making an ethanol sensor + Bluetooth adapter with his own ethanol content app, and Donnie (creator of the JB4 app) is integrating this into the JB4 also.

[Socket]

The E85 mix app tells me, in an empty 63L tank. It needs 29.6 L of E85 and the rest 98 fuel to achieve E40. This is a lot more then the 20L I though gave E40. The values I'm inputting to the app are 63L tank, 85% ethanol in E85, 0% ethanol in 98. Is this right???

[_ink]

Originally Posted by Socket

The E85 mix app tells me, in an empty 63L tank. It needs 29.6 L of E85 and the rest 98 fuel to achieve E40. This is a lot more then the 20L I though gave E40. The values I'm inputting to the app are 63L tank, 85% ethanol in E85, 0% ethanol in 98. Is this right???

That's about right. I used to mix 20L for an e30 blend.