gear ratio's
 

anyone know the gear ratios,preferably mph/1000rpm in each gear for a japanese typr r or rs?
are all 5speed rx's the same gearing or there different versions?


beast

All RX-7s are not the same.... The FC chassis had at least three differently setup up gearboxes that I know of... (NA, 87-88 TII, 89-91 TII). The FDs in the USA all had the same ratios in every year... The Japanese market FDs did have some different gears than the USA models, but I -think- that the only differences were in the 5th gear ratio (and also some models had a 4.33 diff).

Every "turbo" gearbox that I know of on RX-7s had 1-4th as follows

1 - 3.483
2 - 2.015
3 - 1.391
4 - 1.000

Then there are three different 5th ratios I know of...

0.719, 0.762, and 0.806

Sorry I can't give exact specs... you can look them up on the 'net.

As for me, I swapped out my FD-USA-5th gear (0.719:1) with a FD-Jap-5th from a special model... the Bathurst R... and I have a 0.806:1 5th now :)

You are correct.. I just wanted to add one thing.. I believe all FD3S have same gearing except certain model FD's.. I believe RZ tranny and RS are the only one with higher gearing.. I had this info posted awhile back.. This is also why some like to go with RZ tranny.. I'm getting one sometime this month.. hopefully..

I just installed a japanese spec tranny...and 5th gear is a lot stronger now...definitly better rpm range in the freeway...the funny thing is that at first I thought I was imagining it...what a nice suprise huh!

Yeah the USA 5th is BS. It's purely a fuel economy gear/keep the engine at low rpm gear. The 762 or 806 are much better IMO. True, at 90 mph, I'm at 4000, but whatever.

Brian

what are the max speeds in each gear for the jap spec then?what does the rx7 actually rev to as i have read 9000rpm but have seen the redlines at 8000!!



beast