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Thread: gearing guru's at the ready!

  1. 1st December 2008, 09:29 AM #1
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    gearing guru's at the ready!

    in my 85 county with a LT85 and LT230 combo

    if i am running 33" tyres and at approx 1800 rpm i am doing 100kph what ratio transfer case do i have beneath me?
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
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    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
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  2. 1st December 2008, 09:33 AM #2
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    100 on the GPS or 100 on the speedo?

    Regards
    Max P
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  3. 1st December 2008, 09:35 AM #3
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    Quote Originally Posted by Tusker View Post
    100 on the GPS or 100 on the speedo?

    Regards
    Max P
    Incisor your Q is aimless without the GPS reading
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  4. 1st December 2008, 09:35 AM #4
    mike 90 RR Guest
    Quote Originally Posted by incisor View Post
    in my 85 county with a LT85 and LT230 combo

    if i am running 33" tyres and at approx 1800 rpm i am doing 100kph what ratio transfer case do i have beneath me?
    Be fair

    .... Wrap a string around the out side of the tyre ... What is the length of the measured string??

    Is the final revs in 5th (overdrive) gear??
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  5. 1st December 2008, 09:38 AM #5
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    4Lo.com :: Final Gear Ratio, Crawl Ratio, Tire Size Calculators

    For what you've given, it'll be 1.003:1 case

    EDIT: 5th gear ratio found here

    http://members.shaw.ca/red90/gears.html
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  6. 1st December 2008, 09:43 AM #6
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    Metric Gear Ratio Calculator

    a Very tall one. Even a Disco one should pull around 2100 in 5th.
    1995 Defender 110 300TDI :D
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    Ex '66 109" flat deck, '82 109" 3 door, '89 110 CSW V8, '74 Range Rover, '66 88" soft top, '78 88" soft top, '95 Disco ES V8, '88 Surf, '90 Surf, '84 V8 Surf, '91 Vitara.
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  7. 1st December 2008, 09:44 AM #7
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    The speedo thing came up on an LROCS trip over the weekend

    DiscoDave will pipe in I'm sure if he sees this.

    Anyway, we were sitting on 90 on the GPS, in his county he thought we were flying along at 120!

    Regards
    Max P
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  8. 1st December 2008, 11:08 AM #8
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    the speedo reads about 83kph when the truck is doing 100kph

    yep 1.003 definitely fits the bill.

    thanks for the 4lo.com and grimjeeper links, much appreciate the help!


    now what colur speedo cog gets me the closest reading to correct ?
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius
    Reply With Quote Reply With Quote
  9. 1st December 2008, 12:00 PM #9
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    Quote Originally Posted by incisor View Post
    the speedo reads about 83kph when the truck is doing 100kph

    yep 1.003 definitely fits the bill.

    thanks for the 4lo.com and grimjeeper links, much appreciate the help!


    now what colur speedo cog gets me the closest reading to correct ?
    That is strange, sure it isn't the other way around? Speedo on 100, car doing 83? That's what mine was like with 32's.
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  10. 1st December 2008, 12:36 PM #10
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    Quote Originally Posted by isuzurover View Post
    That is strange, sure it isn't the other way around? Speedo on 100, car doing 83? That's what mine was like with 32's.
    am positive...
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius
    Reply With Quote Reply With Quote
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