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Cat 6nz bad mpg

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ninehk, Oct 30, 2022.

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  1. Oct 30, 2022 #1
    ninehk

    ninehk Bobtail Member

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    Got a 2000 peterbilt 379 pulling reefer with a 6nz I got 4.3mpg from south Texas to Oklahoma and from Oklahoma to Missouri I got 5 mpg with wastegate pinched, is the wastegate itself possibly bad ?
     
    ninehk, Oct 30, 2022
    ninehk, Oct 30, 2022
    #1
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  3. Oct 30, 2022 #2
    ninehk

    ninehk Bobtail Member

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    I would think so too but I was getting 5.0 to 5.4 mpg doing the same runs with non pinched wastegate getting 24psi boost and I’m at 33psi pinched
     
    ninehk, Oct 30, 2022
    ninehk, Oct 30, 2022
    #2
    Oxbow Thanks this.
  4. Oct 30, 2022 #3
    lester

    lester Midwest's #1 Feed Hauler

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    Why is the wastegate pinched? How much boost do you get with it pinched and how much without it pinched?
    If you are trying to get better mileage don't let your boost run up all the way.
    How fast are you running?
     
    lester, Oct 30, 2022
    lester, Oct 30, 2022
    #3
    Oxbow and Bean Jr. Thank this.
  5. Oct 30, 2022 #4
    lester

    lester Midwest's #1 Feed Hauler

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    Jan 2, 2012
    NW, Iowa
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    Well then your wastegate is working
     
    lester, Oct 30, 2022
    lester, Oct 30, 2022
    #4
    Oxbow and Bean Jr. Thank this.
  7. Oct 30, 2022 #5
    ninehk

    ninehk Bobtail Member

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    I run 68-70mph keeping it at 1500rpm for the majority of the time
     
    ninehk, Oct 30, 2022
    ninehk, Oct 30, 2022
    #5
  8. Oct 30, 2022 #6
    Rubber duck kw

    Rubber duck kw Road Train Member

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    What was the wind like? That #### eats mileage like nothing else.
     
    Rubber duck kw, Oct 30, 2022
    Rubber duck kw, Oct 30, 2022
    #6
  9. Oct 30, 2022 #7
    ninehk

    ninehk Bobtail Member

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    Jun 10, 2020
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    No real wind in between both fillups
     
    ninehk, Oct 30, 2022
    ninehk, Oct 30, 2022
    #7
  10. Oct 30, 2022 #8
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Probably has a Low-NOx file in it. Find a reputable tuner and also have the overhead adjusted.
     
    Diesel Dave, Oct 30, 2022
    Diesel Dave, Oct 30, 2022
    #8
    ninehk and Bean Jr. Thank this.
  11. Oct 30, 2022 #9
    AModelCat

    AModelCat Road Train Member

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    Sounds standard for a Cat. Personally never seen one break 5 mpg.
     
    AModelCat, Oct 30, 2022
    AModelCat, Oct 30, 2022
    #9
    Oxbow Thanks this.
  12. Oct 30, 2022 #10
    Rubber duck kw

    Rubber duck kw Road Train Member

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    Really? I'm around 5.5 to 6 frequently as long as I'm not fighting wind too bad. Throw wind in the mix and it burns fuel like an aircraft carrier.
     
    Rubber duck kw, Oct 30, 2022
    Rubber duck kw, Oct 30, 2022
    #10
    Roger McG, Oxbow and RJM1953 Thank this.
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