Ethanol mode vs non ethanol?

[bobback]

So if running non eth gas and sled is stock...set to non eth mode? Or eth mode?

 

[black z]

I stand corrected. Geez, where was my brain that day!? Just goes to show, never trust the internet. You're right, ethanol burns cooler and has a lot less BTUs per gallon of gas. Now to completely contradict, but correct, myself. Ethanol doesn't like to burn, especially in cold weather. Thus, the reason black Z mentioned E85 goes to E70 in the cold states. So, the ethanol mode richens the fuel to get a consistent burn. Otherwise the inconsistent burn will cause detonation issues. Now I'm off to get more coffee...

We've all had those days. I did a ton of ethanol research in college for the EPA and the state of MN, also did all of the tuning for our E85 powered Formula SAE car.

 

[black z]

So if running non eth gas and sled is stock...set to non eth mode? Or eth mode?

Doesn't really matter, the ethanol mode should be a little more "safe" with the extra fuel across the map.

 

[AdrenalineAddict]

If running ethanol on ethanol setting or running non-eth on non-eth setting they perform about the same. For a performance gain run on non-eth setting with eth fuel, you'll gain about 100 rpm's and your sled will not burn down or detonate. I know several guys running starting line singles on non-eth setting with eth-fuel with thousands of miles and no motor issues. It appears the axys is mapped extremely fat. In the spring in + 50 degree temps you have to run them that way or your sled will run like a turd.

 

[sledcaddie]

So, if running on the ethanol mode makes the mixture 3% richer, do you notice a significant drop in mileage? Out in the wilderness, it's good to mind your fuel consumption.

 

[black z]

To make the math easy, let's assume you have 10 gallons to start the day. 3% of 1280 oz is 38.4 oz, or .3 gallons. Negligible difference

 

[kylant]

If the Pipe/can are the only changes from stock you would never want or need to run 100 octane. More octane doesnt make more power, a little extra for insurance is fine, but your way past that with 100.

91 octane is all you need with that pipe.

100 octane is the only non-ethanol fuel in our area