Ratio question

Discussion in 'Experienced Truckers' Advice' started by NWAF, Jul 28, 2015.

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  1. Jul 28, 2015 #1
    NWAF

    NWAF Light Load Member

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    Hello im planning on buying a new Volvo and i would like to know what would be my crusing rpm range at 70 mph, it has an ISX15 525HP 13 speed manual with 3.42 rears on 22.5s. Also is this a good all around combination to run on the west and east? Thanks all for the inputs
     
    Last edited: Jul 28, 2015
    NWAF, Jul 28, 2015
    NWAF, Jul 28, 2015
    #1
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  3. Jul 28, 2015 #2
    damutt

    damutt Road Train Member

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    low pro or tall rubber?
     
    damutt, Jul 28, 2015
    damutt, Jul 28, 2015
    #2
  4. Jul 28, 2015 #3
    PackRatTDI

    PackRatTDI Licensed to Ill

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    It will be roughly 1500 rpm on 295/75R22.5 tires and 1450 rpm on 11R22.5 tires.

    Simple equation to figure out.

    Road speed x gear ratio x rear end ratio x tire revs per mile / 60.

    Cummins recommends a 1400 rpm cruise speed at 65 mph with the isx and a max cruise rpm of 1600 rpm. So I'd say you're good. :)
     
    PackRatTDI, Jul 28, 2015
    PackRatTDI, Jul 28, 2015
    #3
    NWAF Thanks this.
  5. Jul 28, 2015 #4
    NWAF

    NWAF Light Load Member

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    Tall
     
    NWAF, Jul 28, 2015
    NWAF, Jul 28, 2015
    #4
  7. Jul 28, 2015 #5
    NWAF

    NWAF Light Load Member

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    Thanks for the information my friend, just spoke to one of my friends with almost identical setup just less horsepower and he says runs at 1430 rpm at 70mph
     
    NWAF, Jul 28, 2015
    NWAF, Jul 28, 2015
    #5
  8. Jul 29, 2015 #6
    mp4694330

    mp4694330 Road Train Member

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    Why tall rubber if may I ask?
     
    mp4694330, Jul 29, 2015
    mp4694330, Jul 29, 2015
    #6
  9. Jul 29, 2015 #7
    NWAF

    NWAF Light Load Member

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    They come stock maybe after wearing them out will switch to low pro
     
    NWAF, Jul 29, 2015
    NWAF, Jul 29, 2015
    #7
    mp4694330 Thanks this.
  10. Jul 30, 2015 #8
    KB3MMX

    KB3MMX Road Train Member

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    You can spec LP 22.5, I just did one last Friday
     
    KB3MMX, Jul 30, 2015
    KB3MMX, Jul 30, 2015
    #8
  11. Jul 30, 2015 #9
    NWAF

    NWAF Light Load Member

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    Yea but the one i want to get is already on the lot
     
    NWAF, Jul 30, 2015
    NWAF, Jul 30, 2015
    #9
  12. Jul 30, 2015 #10
    damutt

    damutt Road Train Member

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    see if dealer will switch them out
     
    damutt, Jul 30, 2015
    damutt, Jul 30, 2015
    #10
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