Gas High test no ethanol vs reg with ethanol - Page 2

**glwilson** · 02-02-2011, 08:41 PM

I guess I didn't realize that. I am surprised at that. Not sure why they don't. Cost I suppose.

Having them would help solve a few problems of fuel management in changing altitudes and temps.

waterman · 02-03-2011, 05:43 PM

Ponch, 85 octane in Colorado is the same as 87 everywhere else. Because of the elevation they deduct 2 off of the octane rating.

Quote:

Originally Posted by ponch

Quote:

Originally Posted by trosco

Hey Markg,
You should be doing the oposite. The higher the altitude the less dense the air and hence, with the Nomad style FI, the richer the mixture becomes. A richer mixture surpress's ignition just like the higher Octane fuels do. So you should be better able to run lower octane fuels at high altitudes and you should need a higher octane fuel as you get closer to sea level.
The same effects occur with air temps. At 105 dgrees the air is less dense than at 35 degrees. So in the summer in Yuma AZ you will probably need premium and in Feb in Flagstaff AZ you will probably be fine with regular.
Our fuel injection controllers are devices that allow richening the mixture over the stock FI settings. By doing that we are able to improve the driveability of the bikes (they are extremely lean in stock form below 1800 RPM) and the richer mixture surpresses pre-ignition (spark knock or ping) which often allows running a lower octane fuel.

True. And when i went to Colorado last year, I saw 85 octane at the pump. Obviously there was a good reason for it...If the Nomad had a closed loop feed back system, all this would be moot. Having to run premium with a bike that has 9.5:1 compression underscores that problem. I wonder if the 1700's have an O2 sensor or require premium? The one thing that does amaze me about the RT is that it has 12:1 compression and can run on 89. It does run better on premium though and the OM says so, but it will run on it.

My Nomad would ping on anything less than 91. I had to put 89 in a couple times and it was a learning experience: Fuel up on proper fuel as often as you can. In a lot of rural areas of Iowa, it's 87 or 89.

02-02-2011, 08:41 PM	#16
glwilson Join Date: Jul 2008 Location: North Central Illinois Posts: 8,575	Gas High test no ethanol vs reg with ethanol I guess I didn't realize that. I am surprised at that. Not sure why they don't. Cost I suppose. Having them would help solve a few problems of fuel management in changing altitudes and temps. __________________ "During times of universal deceit, telling the truth becomes a revolutionary act." "You can have your own opinion, but not your own facts." *Former VBA NCR Assist Regional Leader* Formerly: 2004 1500FI Bronze Nomad: 2009 & 2014 HD Ultra Current Rides: 2017 HD Ultra Limited & 2011 Can Am Spyder RTS-SE Attended: VBA National Rallies 2009, 2011, 2015; VBA/NCR Regional Rally 2010, 12, 14, 16 and several rides throughout with regional members. VBA Member #652 HOG Member #3935417 Login or Register to Remove Ads
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