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RPMs drops down too fast similar as engine brake is on (DD60 14L)

Discussion in 'Trucks [ Eighteen Wheelers ]' started by rdelight, Feb 5, 2015.

Page 2 of 2
  1. May 20, 2016 #11
    Mykhailo

    Mykhailo Bobtail Member

    12
    2
    Jul 14, 2013
    0
    So, what was it?
    I have the same issue.
     
    Mykhailo, May 20, 2016
    Mykhailo, May 20, 2016
    #11
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  3. May 20, 2016 #11
    Mykhailo

    Mykhailo Bobtail Member

    12
    2
    Jul 14, 2013
    0
    So, what was it?
     
    Mykhailo, May 20, 2016
    Mykhailo, May 20, 2016
    #11
    Brettj3876 Thanks this.
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  5. Mar 9, 2021 #13
    Truck 701

    Truck 701 Bobtail Member

    2
    0
    Mar 19, 2020
    0
    Understanding how the inexperienced conclude simple resolutions by saying the problem of rapid RPM drop when shifting is fan cut in or operating in general, or Jake interference .
    The DDEC V has a VGT ( Variable geometry Turbo) which influences the 3rd jake stage as well as boost of course and manifold pressure.
    If you find the problem not so symptomatic with keeping your boost low when shifting, the problem stems from excessive residual manifold pressure. This is caused by 2 main sources.
    1. The EGR VALVE is allowing too much exhaust across the EGR cooler and subsequently kicking back into the cylinders and " sucking back" piston travel.
    2. As the other fellow said, the turbo actuator.
    Play with the boost level at shifting as mentioned, that will help bring the answer to the table
     
    Truck 701, Mar 9, 2021
    Truck 701, Mar 9, 2021
    #13
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