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which is a more accurate way to convert tire, gear, rpm

Discussion in 'Wheels & Tires' started by 08pretaco, Mar 23, 2010.

  1. Mar 23, 2010 at 8:10 PM
    #1
    08pretaco

    08pretaco [OP] Almost there

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  2. Mar 23, 2010 at 8:19 PM
    #2
    drew02a

    drew02a Rocking your mom's world Since 1997

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    They don't really calculate the same thing.

    One calculates everything for specific tire and gear setups.

    The other compares 2 tire sizes.
     
  3. Mar 23, 2010 at 8:27 PM
    #3
    08pretaco

    08pretaco [OP] Almost there

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    well then let me rephrase: does the rpm with a certain tire on ours relate better to real world 65 mph at a certain gear than the other one?
     
  4. Mar 23, 2010 at 8:31 PM
    #4
    drew02a

    drew02a Rocking your mom's world Since 1997

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    The other one can handle more variables. They both use the same formulas though.
     
  5. Mar 23, 2010 at 8:36 PM
    #5
    08pretaco

    08pretaco [OP] Almost there

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    ok so 255/85/16 with 4.56 at 65 mph with overdrive at .81.

    ours gives my rpm to be 3012

    other gives rpm to be 2438

    thats kind of different
     
  6. Mar 23, 2010 at 8:40 PM
    #6
    drew02a

    drew02a Rocking your mom's world Since 1997

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    I actually think ours calculates for 1:1 ratio, but there's no way to know for sure.
     
  7. Mar 23, 2010 at 8:41 PM
    #7
    08pretaco

    08pretaco [OP] Almost there

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    ^ ya there is haha i just input 1:1 and 3012 shows up. that makes sense the difference but why does our calculate to 1:1? the 4 cylinder overdrive is .81:1, maybe a site suggestion?
     
  8. Mar 23, 2010 at 8:42 PM
    #8
    Tillers_Rule

    Tillers_Rule ......................

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  9. Mar 23, 2010 at 8:42 PM
    #9
    drew02a

    drew02a Rocking your mom's world Since 1997

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    Maybe, but not all transmissions have the same over drive ratio
     
  10. Mar 23, 2010 at 8:46 PM
    #10
    08pretaco

    08pretaco [OP] Almost there

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    ya maybe a site suggestion to input you overdrive ratio for a more accurate highway rpm
     
  11. Mar 23, 2010 at 8:47 PM
    #11
    08pretaco

    08pretaco [OP] Almost there

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    hows your gps gonna tell you what rpms your engine is going to run with certain tires and gears?
     
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