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Thread: Fiesta st Injector duty cycle issues

  1. #1
    Tuner in Training
    Join Date
    May 2020
    Posts
    14

    Fiesta st Injector duty cycle issues

    Hey so i have an issues trying to log the duty cycle in percentage i have it all set up as its supposed to be but it doesnt read in percentage, and it is set to, I show like between 600 and 1500 percent im like wtf

  2. #2
    Advanced Tuner
    Join Date
    Jun 2020
    Posts
    776
    With gdi I had to stop thinking in terms of duty cycle and start thinking in terms of crank angles because crank angle is what limits the injection window. As far as I can tell, with the logger you’ll need to log “di start of injection angle (intake)” and “di end of pulse injection angle (intake) firing cyl #”. Subtract the second from the first and that’s the crank degrees of opening. Compare that to the max injector angle in your cal and you can see where you are in relationship to the window. You also have to compare the second one to the max EOI because that will cut it off as well, whichever comes first. Please someone correct me if I’m wrong.