Thank you...
Does the PCV compensate for cold temps?
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,138
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From: SE Michigan
Fuel mileage will go down a bit in colder weather.
"hot air is less dense than cold air; therefore, the engine breathes less hot air per revolution and requires less fuel"
http://www.swri.org/10light/mile.htm
"hot air is less dense than cold air; therefore, the engine breathes less hot air per revolution and requires less fuel"
http://www.swri.org/10light/mile.htm
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Road Captain
Joined: Sep 2009
Posts: 718
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From: Panama City, FL
??
Power Commander 5...known as a PCV, PC-V, etc. It's a programmable Electronic Fuel Injection Module.
You should have no problems with your PC-V map based on weather conditions. The HD/Delphi ECM is a speed density system which is based off of absolute pressure, as conditions change the system uses incoming air temperature vs MAP (manifold absolute pressure) to determine air mass which is then used to determine fuel delivery requirements. This happens many times per second, and in most cases very accurately.
As noted earlier you will use more fuel in colder temps as the air itself is more dense requiring more fuel to maintain the correct air fuel mixture.
As noted earlier you will use more fuel in colder temps as the air itself is more dense requiring more fuel to maintain the correct air fuel mixture.
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Jamie Long / Fuel Moto USA
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Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
What you are seeing is actually "cold enrichment" which is based on temperature. In colder weather the system will maintain a richer mixture much longer than in warmer temps
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Road Captain
Joined: Sep 2009
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From: Panama City, FL
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You should consult a good tuner ....... you definitely have a problem. That is why these bikes are fuel injected and have an ECM, to accomodate for different fuel mixtures under different conditions. That is the whole purpose of a tuner, to give you the optimal mix of air and fuel under the prevailing conditions. Before this, a carbureted bike going from low altitude to high would need to be adjusted to accomodate for the loss of oxygen, today's bikes do this automatically. The same for temperature, you seriously should not have to change your map for the seasons. Holy crap, where I live, it was in the 80's one day, the 40's the next, I would have to flash my ECM every morning based on the weatherman. Sometimes there's a 40 degree swing between mid day and mid night.
I have been to a good tuner, one of the best and well known in the country. The bike runs very good. When it gets cold the mpg goes down no matter what. Seems to me it runs a little rougher too, I'm not saying it runs bad, but I can feel a difference. Maybe that's just how an engine feels when it is sucking cold air and using more gas, I don't know. But when it drops to a high in the 40s I make it a little richer, not much, you wouldn’t notice a fuel drop because of it, maybe all it does is make it a hair more responsive but it makes me feel better. But about the lower mpg in cold weather, that is just how it is. As long as the roads are fairly clear I'm on my bike fall and spring when there is snow everywhere. The mpg difference between those cold months and the warm months is very noticeable.
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Joined: Apr 2008
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From: Wisconsin
I have been to a good tuner, one of the best and well known in the country. The bike runs very good. When it gets cold the mpg goes down no matter what. Seems to me it runs a little rougher too, I'm not saying it runs bad, but I can feel a difference. Maybe that's just how an engine feels when it is sucking cold air and using more gas, I don't know. But when it drops to a high in the 40s I make it a little richer, not much, you wouldnt notice a fuel drop because of it, maybe all it does is make it a hair more responsive but it makes me feel better. But about the lower mpg in cold weather, that is just how it is. As long as the roads are fairly clear I'm on my bike fall and spring when there is snow everywhere. The mpg difference between those cold months and the warm months is very noticeable.