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T800 kenworth won’t go pass 65

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Heavy pressure trucking, Nov 23, 2019.

  1. Nov 23, 2019 #1
    Heavy pressure trucking

    Heavy pressure trucking Bobtail Member

    11
    4
    Nov 23, 2019
    0
    Hi guys I new to the owner op side of trucking. I have a 2011 kenworth t800 with a Cummins motor that has been deleted ,truck has 96k miles super low for year. The problem I’m having on my very first load I notice truck would get up to 65 but the rpm will be 1900 empty. I got my load truck trailer and load is only 75,000lbs. When I start to drive o only can go 55-60 at 1900 rpm. And no check engine lights are on. Can anyone help me with the problem I’m having. And my truck is only getting 2.7 mpg.

    thanx in advance
     
    Heavy pressure trucking, Nov 23, 2019
    Heavy pressure trucking, Nov 23, 2019
    #1
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  3. Nov 23, 2019 #2
    xsetra

    xsetra Road Train Member

    5,110
    6,972
    Aug 21, 2011
    0
    Did you just buy the truck?
    What motor, transmission, Rears ratio.
    The engine computer could be programmed to a speed limit.
    Not sure about your mpg.
     
    xsetra, Nov 23, 2019
    xsetra, Nov 23, 2019
    #2
  4. Nov 23, 2019 #3
    Roberts450

    Roberts450 Road Train Member

    2,237
    3,636
    Feb 6, 2016
    0
    Speed at the same RPM cant change unless the clutch is slipping. Also sounds like you’re not getting into the very top gear unless the truck has really low gears and small tires.
     
    Roberts450, Nov 23, 2019
    Roberts450, Nov 23, 2019
    #3
  5. Nov 27, 2019 #4
    Heavy pressure trucking

    Heavy pressure trucking Bobtail Member

    11
    4
    Nov 23, 2019
    0
    Axle ratio is 4.63 I think this is my problem.
     
    Heavy pressure trucking, Nov 27, 2019
    Heavy pressure trucking, Nov 27, 2019
    #4
  7. Nov 27, 2019 #5
    Heavy pressure trucking

    Heavy pressure trucking Bobtail Member

    11
    4
    Nov 23, 2019
    0
    Axle ratio is 4.63
     
    Heavy pressure trucking, Nov 27, 2019
    Heavy pressure trucking, Nov 27, 2019
    #5
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