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Thread: FCA and Wastegate

  1. #1
    Junior Member
    Join Date
    Sep 2011

    Default FCA and Wastegate

    I am logging FCA% Commanded and actual. I am not understanding what the percentages mean and what causes the difference. Second I have been searching and still unclear what the Duty Cycle is in relation to the wastegate on the turbo. I dont understand when the minimum or Max Duty cycle would be used. I have read the definations in the tune tool. I am sure its simple....Im just not grasping it.

  2. #2
    Lifetime Member dansdieselp's Avatar
    Join Date
    Apr 2009


    For the FCA the higher the Commanded % duty cycle the higher the pressure and flow. Same goes for the wastegate DC. Most set the max to 100% and raise the minimum up until they achieve the boost they desire.
    Dan's Diesel Performance
    Specializing in Duramax and Cummins Diesels
    Building and tuning trucks from daily drivers to full out competition

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