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RPM calculations

Discussion in 'Intermediate CJ-5/6/7/8' started by farfle, Aug 9, 2007.

  1. Aug 9, 2007
    farfle

    farfle old dog

    Mariposa, CA
    Joined:
    May 14, 2007
    Messages:
    430
    I've given up on my mind of it's own speedometer. I'm installing a tach, from which I'm hoping to get a better idea of my speed. The only limit that matters around here is 55mph. The CHP are absolutely anal and radar equipped about it.
    So I'm looking for some sort of online calculator that will allow me to determine 55mph@?RPM. I'm running a t14, 3.73's, stock setup for a 75, except for the tires, which are 30.1".
    Seein' as how you are either going either uphill or downhill here, I believe it won't be 100% accurate...but at least I'll be able to show the Judge I tried, should it come to that.
    Anybody have a link to such a calculator?
     
    farfle, Aug 9, 2007
    #1
  2. Aug 9, 2007
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    5,474
    You will be turning 2290.046511627907 RPMs...

    Novak
     
    Warloch, Aug 9, 2007
    #2
  3. Aug 9, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    Make a look-up table and paste it to the dash.
     
    timgr, Aug 9, 2007
    #3
  4. Aug 9, 2007
    farfle

    farfle old dog

    Mariposa, CA
    Joined:
    May 14, 2007
    Messages:
    430
    Thanks guys. That's a bookmark.
     
    farfle, Aug 9, 2007
    #4
  5. Aug 9, 2007
    BobFortier

    BobFortier Member

    Joined:
    Nov 24, 2005
    Messages:
    254
    I have a Excel sheet that I can e-mail you
     
    BobFortier, Aug 9, 2007
    #5
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