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FJR Motorcycle Forums
Technical & Mechanical Problems
Extremely low MPG
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<blockquote data-quote="RossKean" data-source="post: 1449015" data-attributes="member: 19880"><p>I don't know the computation algorithm used but I agree that it is astonishingly accurate - as good as refill-and-calculate (at least on my bike) given that you can be off ± a few hundred millilitres to "full", even if you are careful. I would have expected that variability between fuel injectors, among other factors, would be enough to bias the result. We know that the calculation is based upon what the ECU has told the injectors to do because when a Power Commander is placed in-line, the fuel consumption accuracy is way off (PC is usually used to add extra fuel in certain ranges but the ECU doesn't know that).</p><p></p><p></p><p></p><p>Four stroke engine so only one injection per cylinder for <strong>two</strong> revolutions but I get the point. I have no idea how it uses the pulse width/frequency data, or perhaps it just accumulates total open duration...? </p><p></p><p>I am certain that it is some sort of "running average" rather than "since last reset" - otherwise the value would never change once you had a dozen tanks through it. As far as I can recall, I haven't seen documentation on that.</p></blockquote><p></p>
[QUOTE="RossKean, post: 1449015, member: 19880"] I don't know the computation algorithm used but I agree that it is astonishingly accurate - as good as refill-and-calculate (at least on my bike) given that you can be off ± a few hundred millilitres to "full", even if you are careful. I would have expected that variability between fuel injectors, among other factors, would be enough to bias the result. We know that the calculation is based upon what the ECU has told the injectors to do because when a Power Commander is placed in-line, the fuel consumption accuracy is way off (PC is usually used to add extra fuel in certain ranges but the ECU doesn't know that). Four stroke engine so only one injection per cylinder for [B]two[/B] revolutions but I get the point. I have no idea how it uses the pulse width/frequency data, or perhaps it just accumulates total open duration...? I am certain that it is some sort of "running average" rather than "since last reset" - otherwise the value would never change once you had a dozen tanks through it. As far as I can recall, I haven't seen documentation on that. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Extremely low MPG
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