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Cat 6nz bad mpg

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

Page 2 of 2
  1. Oct 30, 2022 #11
    Oxbow

    Oxbow Road Train Member

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    Do you suppose maybe the wastegate shouldn't be pinched off?

    The mileage difference between pinched and open is pretty conclusive.
     
    Oxbow, Oct 30, 2022
    Oxbow, Oct 30, 2022
    #11
    cke, Diesel Dave, lester and 2 others Thank this.
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  3. Oct 30, 2022 #12
    AModelCat

    AModelCat Road Train Member

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    Not to mention how much harder 9 lbs of additional boost might be on the internals. That's about a 30% increase over stock.
     
    AModelCat, Oct 30, 2022
    AModelCat, Oct 30, 2022
    #12
    Oxbow Thanks this.
  4. Oct 30, 2022 #13
    ninehk

    ninehk Bobtail Member

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    Yeah I don’t really want to run it with the wastegate pinched,but getting that .7 mpg increase and a obvious power increase
     
    ninehk, Oct 30, 2022
    ninehk, Oct 30, 2022
    #13
  5. Oct 30, 2022 #14
    Oxbow

    Oxbow Road Train Member

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    Our IFTA average is consistently over 5 with two old B models and a 6NZ.
     
    Oxbow, Oct 30, 2022
    Oxbow, Oct 30, 2022
    #14
    cke Thanks this.
  7. Oct 30, 2022 #15
    ninehk

    ninehk Bobtail Member

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    Jun 10, 2020
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    I had that 5.0 - 5.4 mpg average but it suddenly it went to crap until I pinched the wastegate last night and that got me back to 5
     
    ninehk, Oct 30, 2022
    ninehk, Oct 30, 2022
    #15
  8. Oct 30, 2022 #16
    wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    Start with a good tune up. The #1 reason for poor fuel mileage is boost leaks. #2 is overhead adjustment. Check the pressure side by blocking off turbo inlet and pressure up the left side with a regulator set at 10 psi. Spray everything down and fix even the minute leaks. Then run a good over head and see where your at.
     
    wore out, Oct 30, 2022
    wore out, Oct 30, 2022
    #16
    Roger McG, Goodysnap, Oxbow and 3 others Thank this.
  9. Oct 30, 2022 #17
    M22 rockcrusher

    M22 rockcrusher Road Train Member

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    6nz uh.... bad mpg? DROP THE HAMMER ON IT.
     
    M22 rockcrusher, Oct 30, 2022
    M22 rockcrusher, Oct 30, 2022
    #17
  10. Oct 30, 2022 #18
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    My former 5EK had a tune and still average 7.0.
     
    Diesel Dave, Oct 30, 2022
    Diesel Dave, Oct 30, 2022
    #18
    HoundDog7, Roger McG, Opendeckin and 2 others Thank this.
  11. Oct 31, 2022 #19
    Opendeckin

    Opendeckin Medium Load Member

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    I hit 6.82 last quarter by slowing down from 70 to 62mph with a flat top W900L pulling a Reefer
     
    Opendeckin, Oct 31, 2022
    Opendeckin, Oct 31, 2022
    #19
    Oxbow Thanks this.
  12. Nov 4, 2022 #20
    HoundDog7

    HoundDog7 Light Load Member

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    Not hard at all. A stock 600 C-16 7CZ runs 35+ boost all day long....
     
    HoundDog7, Nov 4, 2022
    HoundDog7, Nov 4, 2022
    #20
    RJM1953 Thanks this.
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