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Christo can you post that RPM/gear ratio figures?

Discussion in '80-Series Tech' started by yomama, Apr 4, 2003.

  1. yomama

    yomama

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    Christo,
    Hopefully you saved a copy of that?

    Someone here is running the 4.88's? Are you running 35's?

    I am thinking about going with 4.88's on a 33" tire.

    What is the max width tire that we can run on these stock rims? Currently running 285/75/r16. Would like 33/12.5/16 in the SSR flavor. Is anybody running these?

    Yomama
     
  2. sleeoffroad

    sleeoffroad Supporting Vendor

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    Re: Christo can you post that RPM/gear ratio figur

    Nope, that was not me. 4.88's with 33's would be a bit much in my opinion. Especially since you have the turbo to help you with the towing. I have had 37" SSR's on stock wheels but they were beadlocked :D

    33" SSR's on stock wheels will be fine.
     
  3. Photoman

    Photoman SILVER Star

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    Re: Christo can you post that RPM/gear ratio figur

    Yo- Here is a link to one of many sites with these calculators. http://www.ring-pinion.com/c-rpm.html

    Also, here is a trans ratio table that Cruiserdan put up on sor and I shamelessly saved. Hope this helps.
    Bill

    Landcruiser trans ratios

    FJ80 A440F 1-90 to 7-92
    1st 2.950:1
    2nd 1.530:1
    3rd 1.000:1
    OD .717:1
    R 2.678:1
    fluid cap 16.4 US qts DEXII/III

    FZJ80 A442F 8-92 to 12-94
    1st 2.950:1
    2nd 1.530:1
    3rd 1.000:0
    OD .765:1
    R 2.678:1
    fluid cap 16.4 US qts DEXII/III

    FZJ80 A343F 1-95 to 1-98
    1st 2.804:1
    2nd 1.531:1
    3rd 1.000:1
    OD .753:1
    R 2.393:1
    fluid cap 11.7 US qts DEXII/111
     
  4. Keep

    Keep

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    Re: Christo can you post that RPM/gear ratio figur

    I remember this post. Its the one that clearly shows the superiority of the A442F. [​IMG]
     
  5. yomama

    yomama

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    Re: Christo can you post that RPM/gear ratio figur

    Keep.... :slap:

    Wow, just noticed the "fluids" part. 5 more quarts used on the older ones, that is interesting.

    Yomama
     
  6. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

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    Re: Christo can you post that RPM/gear ratio figur

    I also posted it here. It's on page 1.

    To add a bit.....Using the table and some math tells you what you want to know.

    EG: average 275/70/60 tire makes 667 revs per mile. 667 x 4.1 = 2735 driveshaft RPM = 60 mph. x .765 (in the case of a 442) = 2092 driveshaft rpm. at 60 mph in OD with stock tires and gears. I say driveshaft rpm because there is a torque converter in the equation. If it is un locked, your rpm will vary.

    EG2: average 315/75/16 tire makes 600 revs per mile. 600 x 4.56 = 2736 rpm, almost a dead match to 4.1/stock tire.

    ARE YOU BORED YET?......... :beer:

    (A bit slow at work today) :dunno:
     
  7. Hltoppr

    Hltoppr SILVER Star

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    Re: Christo can you post that RPM/gear ratio figur

    :bow: :bow: Long live the A440! Except for the 2-3 shift weirdness, that part sucks... :-/

    -H-
     
  8. yomama

    yomama

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    Re: Christo can you post that RPM/gear ratio figur

    Were the stock Michelins 265 or 275? I thought they had been 265.

    Yomama
     
  9. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

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    Re: Christo can you post that RPM/gear ratio figur

    275/70/16........Lots of people put 265's on as first replacements because most of the tire shops did not have or know of the 275's.......If I am not mistaken, the only vehicle to spec this tire is the Landcruiser........... ::)
     
  10. T Y L E R

    T Y L E R

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    Re: Christo can you post that RPM/gear ratio figur

    ............................................................................................................................................................................................................................................................................................whaa?

    Oh .. I'm sorry , I must have fallen asleep !

    Um , thanks CD !! Next time post that techie stuff closer to bedtime , will ya ??

    ::) :p :D
     
  11. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

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    Re: Christo can you post that RPM/gear ratio figur

    Good night.....sweet Prince...... :D
     
  12. landtank

    landtank SILVER Star

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    Re: Christo can you post that RPM/gear ratio figur

    Yo, I might be the one your looking for. I'm running 4.88s and 315s which is a 35" tire. If you're thinking of going with 33"s don't expect a top speed much past 65 mph and wringing the piss out of it at that. A ratio of 4.56 with 33 would be more in line with what I'm running now. And at that ratio it would be slightly lower than stock by about 5%.

    Rick
     
  13. '74 UA FJ

    '74 UA FJ

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    Bump since it took me way to long searching on here to find a thread with transmission ratios in it.
     
  14. airlaird

    airlaird

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    Please remember 4:56's on 35's VS 4:88's on 35's is exactly a 100 RPM difference...believe me...I have had both set ups.
    airlaird
     
  15. AdventureBuddies

    AdventureBuddies

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    Very interesting - thanks for posting. I have 315s with 4.56 and my speedo is exactly accurate which makes sense since it nearly replicates the stock set up.
     
  16. Atoyot1031

    Atoyot1031

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    This is my lazy two part question to someone who likes figuring out such things (Cruiserdan perhaps;)):

    So with 315s and 4.88s what percentage is the speedometer off by?

    Would not that percentage be the same percentage that the odometer is off by?

    Thanks,
    Nick