Christo can you post that RPM/gear ratio figures? (1 Viewer)

[yomama]

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

 

[sleeoffroad]

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

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

 

[Photoman]

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

 

[Keep]

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.

 

[yomama]

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

Keep....

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

Yomama

 

[cruiserdan]

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?.........

(A bit slow at work today) :dunno:

 

[Hltoppr]

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-

 

[yomama]

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

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

Yomama

 

[cruiserdan]

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........... :

 

[T Y L E R]

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 ??

:

 

[cruiserdan]

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

Good night.....sweet Prince......

 

[landtank]

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

 

['74 UA FJ]

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

 

[airlaird]

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

 

[AdventureBuddies]

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?.........

(A bit slow at work today) :dunno:

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.

 

[Atoyot1031]

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