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|May 6th, 2008, 11:18 PM||#1|
Community Guru Wannabe
Ride: 2007 softail fxst
Join Date: Sep 12th, 2007
Air Fuel Ratio
|May 14th, 2008, 04:09 PM||#2|
Ride: 1996 Road King
Join Date: May 11th, 2008
Location: Middle Tennessee
Re: Air Fuel Ratio
FWIW, I run mine in the high 14's from 20% up to about 40% throttle and 2000 to 3500 (or so) RPM. I got 45-49 MPG out of a 90+ horse 80-incher with a 3.36 final drive, cruising generally around 65-70 MPH. (I have noticed a big hit in mileage when I cruise above 70 MPH, probably due to aerodynamic effects).
We'll see what happens when I get it running, but I expect similar results from my new motor.
My experience has been that people (dyno people) set the AFR in the max-power ranges at all settings--probably because it's just less time consuming to do it that way, but as you found out, your mileage goes down the tubes.
In my opinion, you do not need max power until you get to 80-100% throttle. Everywhere else you're probably looking for better mileage. I have run mine as lean as 15:1 at highway speeds/loads, but I don't recommend that to anyone unless they have really good cylinder heads, fairly cool weather, and they are willing to watch/listen very attentively to what the engine is telling you as you're going down the road. Keep in mind that mine is an MM unit, and I can control the mixture distribution pretty well. May not be so true on a Delphi bike.
Not sure you're doing yourself any favors by running rich down low. All of mine have tended to be sorta okay there anyway, and not really leaning out until they get up above 2500 or more.
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