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The lousy D13 engine brake

Discussion in 'Volvo Forum' started by 86scotty, Aug 4, 2019.

  1. Aug 4, 2019 #1
    86scotty

    86scotty Road Train Member

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    Been meaning to post this awhile. I'm really curious how much RPM abuse I should throw at my D13.

    Having driven Detroits and Cummins before this truck (2015 780) I'm blown away by how weak the engine brake is. I know how to use it, with the 1/2/3/max settings or just engaging the downhill cruise but it doesn't ever seem happy, it's either way too little or too much at way too high RPM's.

    I-shift hardly ever lets my truck see over about 1600 RPMs but to get any engine braking at all on this motor with a heavy load you have to bump it to 3 or max and it shoots the RPMs up to 2100 and sounds like it's going to explode. I hate doing this. Is it ok for this motor? It just doesn't make sense to me becuase you never want to run a big diesel up to nearly 2k RPMs but in engine brake on these it seems like you have to.
     
    86scotty, Aug 4, 2019
    86scotty, Aug 4, 2019
    #1
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  3. Aug 4, 2019 #2
    supersnackbar

    supersnackbar Road Train Member

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    On engine braking, RPM's are good...up to a point. The owners manual for the old International Maxxforce engine said optimal engine braking was achieved between 1900 & 2150 RPM's. My MP8 Mack with the mDrive will downshift down to 10th and run the revs to 2100-2200 if 11th or 12th doesn't hold me back. And my truck is just a Volvo in a Mack costume.
     
    supersnackbar, Aug 4, 2019
    supersnackbar, Aug 4, 2019
    #2
    86scotty and Newto Trucking Thank this.
  4. Aug 4, 2019 #3
    86scotty

    86scotty Road Train Member

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    Just seems way too high for a diesel but I guess I’ll get used to it.
     
    86scotty, Aug 4, 2019
    86scotty, Aug 4, 2019
    #3
  5. Aug 6, 2019 #4
    KB3MMX

    KB3MMX Road Train Member

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    FYI .... You can adjust the engine brake strength in the parameters with a Volvo...

    I usually like;

    #1 60% area
    #2 85%
    #3 100%

    (A) Mode 85%

    They are most effective 1300-1800rpm .....if you have noticed higher RPM they don't work very good and lose strength above 1800
     
    KB3MMX, Aug 6, 2019
    KB3MMX, Aug 6, 2019
    #4
  7. Aug 6, 2019 #5
    KB3MMX

    KB3MMX Road Train Member

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    Fyi.... The D13 and Mdrive/iShift is produced at the MACK plant in Hagerstown MD , 100% USA Mack.....

    (Identical engines except for plastic badges and final paint color)

    The Mack powertrain is awesome in Volvo trucks
     
    KB3MMX, Aug 6, 2019
    KB3MMX, Aug 6, 2019
    #5
  8. Aug 6, 2019 #6
    KB3MMX

    KB3MMX Road Train Member

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    Orrstown, PA
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    Yes above 1800 you can feel the loss of engine brake power in D13/MP8
     
    KB3MMX, Aug 6, 2019
    KB3MMX, Aug 6, 2019
    #6
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