Higher Elivation
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Stage III
Joined: Oct 2016
Posts: 3
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From: Montgomery, IL
Higher Elivation
Last month I rode threw the Rocky Mountains. As expected my power lessened the higher I went
I have a 2005 RoadKing Classic EFI, I have the S&S 510 cam Kit, Power Commander III and Python slip ons, Stock air cleaner.
What would be a relatively inexpensive way to get a little more while at higher elevations?
Other then that the bike runs really good and I don't want to change that.
I have a 2005 RoadKing Classic EFI, I have the S&S 510 cam Kit, Power Commander III and Python slip ons, Stock air cleaner.
What would be a relatively inexpensive way to get a little more while at higher elevations?
Other then that the bike runs really good and I don't want to change that.
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Stage III
Joined: Oct 2016
Posts: 3
Likes: 0
From: Montgomery, IL
Thanks, also thinking of getting true dual exhaust. Would that help at all.
When you say "Without O2 sensors", Are you saying that with the Power Commander III it cant adjust or take proper map readings?
When you say "Without O2 sensors", Are you saying that with the Power Commander III it cant adjust or take proper map readings?
Seasoned HDF Member
Joined: Mar 2012
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From: Centennial, CO
A freer flowing exhaust system will help, but not true duals. A good 2-1 system is better for making power.
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Joined: Dec 2005
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From: poway
Without going to a super charger (can compensate for the loss of air density) the easiest thing to do is increase displacement and compression ratio.. The base EFI system has the ability to compensate for changes in air density when tuned right. Not sure how the PC handles things as it simple rides on top of the stock Ecu.. Motor will probably get a little rich tho..
Seasoned HDF Member
Joined: Mar 2012
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From: Centennial, CO
Amazingly enough, I rode for 5 days around the west central area and was getting 58 MPG vs. my usual 42 MPG here in town. All other riders that were with me experienced the same puzzling phenomena.
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From: poway
At altitude correct?? Whats your point?
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Seasoned HDF Member
Joined: Mar 2012
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From: Centennial, CO
Yes at altitude. The point being conventional wisdom would dictate that with less air density the machines would run rich, therefore less MPG. However, we all experienced significant jumps in MPG. I'm not smart enough to figure it out.
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Seasoned HDF Member
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From: poway
Depends on the number of factors, You can still run rich lambda and get better mileage at altitude.. Also how rich you run depends on the fuel delivery system.. Some do a better job of compensating then others.
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Joined: Jan 2008
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From: SoCal
MAP sensor(manifold absolute pressure) gives the ecm the changes in pressure to compensate for elevation changes.