Looking for gear chart

Discussion in 'General Discussions' started by RompinRam, Feb 22, 2012.

  1. RompinRam

    RompinRam Senior Member

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    Hey guys, a while back I had seen a chart on here that showed what your best RPM's would be with like tire size and gear size I believe. Does anybody know what I am talking about. If so I'd appreciate some help trying to locate it again.

    Thanks all!


    ---
    I am here: http://maps.google.com/maps?ll=41.778080,-87.866399
     
  2. txbass06

    txbass06 Supporting Member

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    This it?

    [​IMG]
     
  3. RompinRam

    RompinRam Senior Member

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  4. RompinRam

    RompinRam Senior Member

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  5. Trupiano

    Trupiano Registered User

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    Yellow is more efficiency, black is OEM, blue is more power.


    Tapatalk'in
     
  6. RompinRam

    RompinRam Senior Member

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  7. glass3222

    glass3222 Senior Member

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    No you will not be more efficient. One thing to remember with that chart is that the RPMs are with a trans gear ratio of 1:1(no overdrive) at 60 MPH. Your Ram has a 0.67:1 second overdrive, so the RPM in the chart will be much lower than that. You will be more efficient with a 31" tire and 3.92 or 33/35" tire with 4.56 IMO
     
    Last edited: Feb 22, 2012
  8. Ramunit

    Ramunit Senior Member

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    You must multiply those RPM numbers by .67 to get the accurate RPM if you are in 5th gear.

    OR..... If you want to do the formula yourself it's:
    mph x gear ratio x 336
    _____________________
    Tire diameter
    x
    trans gear ratio

    70(mph) X 4.56 x 336 = 107251.2
    107251.2 / 33(tire dia) = 3250.03
    3250.03 x .67(5th trans ratio) = 2177.52

    2177.52 RPMs at 70 mph in 5th
     
    Last edited: Feb 22, 2012
  9. RompinRam

    RompinRam Senior Member

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  10. Trupiano

    Trupiano Registered User

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    Tpellus, what's with the "I am here:" google maps link?
     

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