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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #611  
Old 3 Days Ago
XL Dane XL Dane is offline
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Join Date: Jun 2019
Posts: 65
Sportster/Buell Model: Sportster 48, 1275 + 570
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I corrected the speedo a while ago, but I thought that the ECM knew the precise fuel consumption by using injector size and time?
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  #612  
Old 3 Days Ago
Tomcatt Tomcatt is offline
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Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2017
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Quote:
Originally Posted by XL Dane View Post
I corrected the speedo a while ago, but I thought that the ECM knew the precise fuel consumption by using injector size and time?
But it needs to be calibrated, mine was way off as delivered. I corrected the speedo VSS first and then dealt with trip center. In "Trip Center" you enter correction factors. It was showing I'd used ~ 2.5 gal when I was putting in 3.0. I ended up with a 1.18 "fuel used" correction factor so what it shows for "fuel used" matches what I put in. I'd reset the trip meter then run 3 or 4 tanks of gas recording how much I put in, 10+ gal with my 4.5 gal tank, and would then apply a correction and check again and correct again. It took a while. Now it's dead on, it was worth doing.

It's handy runnin' down the road, being able to watch "trip econ (mpg)" and have a good idea how far I can stretch fuel stops.
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2017 XL1200C in SE Wisconsin, USA
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  #613  
Old 3 Days Ago
XL Dane XL Dane is offline
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Sportster/Buell Model: Sportster 48, 1275 + 570
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Ok thanks, good to know.
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