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1999 N14 525hp rpm calculation check

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Soon2BeOwnerOperator, Oct 4, 2023.

Page 2 of 3
  1. Oct 4, 2023 #11
    singlescrewshaker

    singlescrewshaker Road Train Member

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    Spicer Transmission Ratio RPM Calculator

    You said standard 22.5, as in 11R?
    If I'm wrong change the tire height to 40" for 295/75 & 275/80 22.5

    I'd be in 16th more often than not. Be spinning the back box constantly in 17th not saving much fuel & creating more heat for the cooler to deal with..

    16th
    17th
    18th


    Screenshot_20231004_205227_Samsung Internet.jpg


    Screenshot_20231004_205309_Samsung Internet.jpg




    Screenshot_20231004_205339_Samsung Internet.jpg
     
    singlescrewshaker, Oct 4, 2023
    singlescrewshaker, Oct 4, 2023
    #11
    Oxbow Thanks this.
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  3. Oct 4, 2023 #12
    Soon2BeOwnerOperator

    Soon2BeOwnerOperator Light Load Member

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    Right on. So it seems going 75-80 empty I could be in 18 high. I don't think I'll have an issue since it's a 18 speed and nice to have the option to always drop rpm I suppose.
     
    Soon2BeOwnerOperator, Oct 4, 2023
    Soon2BeOwnerOperator, Oct 4, 2023
    #12
    singlescrewshaker Thanks this.
  4. Oct 4, 2023 #13
    Soon2BeOwnerOperator

    Soon2BeOwnerOperator Light Load Member

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    Maybe 80-85 actually but still haha
     
    Soon2BeOwnerOperator, Oct 4, 2023
    Soon2BeOwnerOperator, Oct 4, 2023
    #13
    singlescrewshaker Thanks this.
  5. Oct 4, 2023 #14
    skallagrime

    skallagrime Road Train Member

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    skallagrime, Oct 4, 2023
    skallagrime, Oct 4, 2023
    #14
    singlescrewshaker Thanks this.
  7. Oct 5, 2023 #15
    lester

    lester Midwest's #1 Feed Hauler

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    NW, Iowa
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    lower RPM does not always equal better MPG. Watch your boost pressure, keep it low. you can get better mileage at 1700rpm cruising easy than say 1200 and lugging
     
    lester, Oct 5, 2023
    lester, Oct 5, 2023
    #15
    singlescrewshaker, Oxbow and Magoo1968 Thank this.
  8. Oct 5, 2023 #16
    Soon2BeOwnerOperator

    Soon2BeOwnerOperator Light Load Member

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    New Hampshire
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    Right on. Any other tips for fuel economy driving tips now that I'll be forking the bill? I've heard slow and light in the throttle and I've heard the engine works most efficent with the pedal to the floor so I'd be curious to hear what you all got to say. Thanks for the information shared so far
     
    Soon2BeOwnerOperator, Oct 5, 2023
    Soon2BeOwnerOperator, Oct 5, 2023
    #16
  9. Oct 5, 2023 #17
    Soon2BeOwnerOperator

    Soon2BeOwnerOperator Light Load Member

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    Feb 13, 2019
    New Hampshire
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    I've also heard the newer engines like the dd15 are obtaining better mpg by running at lower rpms. The older engines do not perform as well at lower rpms or what is this all about. If it wasn't for eld I'd prolly go with a dd15 instead of a n14 or detroit 12.7
     
    Soon2BeOwnerOperator, Oct 5, 2023
    Soon2BeOwnerOperator, Oct 5, 2023
    #17
  10. Oct 5, 2023 #18
    Magoo1968

    Magoo1968 Road Train Member

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    Drive like you have a egg under fuel pedal.
     
    Magoo1968, Oct 5, 2023
    Magoo1968, Oct 5, 2023
    #18
    singlescrewshaker Thanks this.
  11. Oct 5, 2023 #19
    Oxbow

    Oxbow Road Train Member

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    It really depends a lot on what you will be doing. 2.85s might be ok for all highway driving with your gross weight always being lighter than 80,000 lbs., but if you are ever going to have to start a heavy load in soft conditions or on a steep incline you may end up spending all that you saved in fuel in one repair of the clutch, driveline, or rear ends.
     
    Oxbow, Oct 5, 2023
    Oxbow, Oct 5, 2023
    #19
    W923, singlescrewshaker and skallagrime Thank this.
  12. Oct 5, 2023 #20
    Soon2BeOwnerOperator

    Soon2BeOwnerOperator Light Load Member

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    Feb 13, 2019
    New Hampshire
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    I don't think I'll be getting 80k started on a steep incline with a 700hp pimped out cat . What is soft conditions? Like dirt? You really think I wouldn't be able to pull 80k with a N14 and an 18 speed with a 2.85?
     
    Soon2BeOwnerOperator, Oct 5, 2023
    Soon2BeOwnerOperator, Oct 5, 2023
    #20
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