Outer Limits 4x4 Board

Well theoretically then

I've been doin some calculations with different diff and tyre combinations. this means swapping the standard (diesel) rocky diffs with the f20's will compensate for 39's (only taking account gearing) and petrol diffs for 34's ( in comparison with standard tires)
I know that the math is correct , but just curious: what RPMs do you guys run (dsl/petrol) driving 120 kph with what tire sizes?

cheers, Ron

A feroza would be doing around 4300 RPM @ 120km/h with 225/70R15 tyres.

You're very lucky to be able to do such mods!!

murcod wrote:You're very lucky to be able to do such mods!!

Yeah only in my mind................
I was just playing with some numbers.
Right now I'm doing 4000 RPM at 110 kph in fifth. That is with 31's

With roza and rocky gearing, its pretty average at the best, so making it the same as stock with 39's would still suck major cawk. Better off running like 35's and keeping a bit or a crawl ability ( i do know that you are only pointing this out, not fully planning on it yet). Other thing is that the motor will be pushing major amount of weight per wheel (like bout 47 KG) per tyre. I know what my zook will not perform the same with my swampers on compared to my smaller tyres, even though the gearing has been changed. Just things to think about, brought to you by Mr Jim Beam.
Layto....

lay80n wrote:With roza and rocky gearing, its pretty average at the best, so making it the same as stock with 39's would still suck major cawk. Better off running like 35's and keeping a bit or a crawl ability ( i do know that you are only pointing this out, not fully planning on it yet). Other thing is that the motor will be pushing major amount of weight per wheel (like bout 47 KG) per tyre. I know what my zook will not perform the same with my swampers on compared to my smaller tyres, even though the gearing has been changed. Just things to think about, brought to you by Mr Jim Beam.
Layto....

Go to bed Layto, its way past your bed time.