NA FC ring an pinion gear sets?
Joined: Oct 2003
Posts: 11,576
Likes: 27
From: Morristown, TN (east of Knoxville)
A stock NA will top out 4th gear, which puts you right around 135-140 depending on tire diameter.
Joined: Mar 2001
Posts: 31,837
Likes: 3,234
From: https://www2.mazda.com/en/100th/
case in point, the mazda competition gearbox was coupled with 4.88 final drive. the competition box has a proper looonnnggg first gear, followed by well measured small drops between shifts through 5th.
mazda comp
1st: 2.350
2nd: 1.608
3rd: 1.240
4th: 1.00
5th: 0.881 or 0.839
Renesis
2nd: 2.269
3rd: 1.645
4th: 1.187
5th: 1.00
6th: 0.843 (fixed!)
mazda comp
1st: 2.350
2nd: 1.608
3rd: 1.240
4th: 1.00
5th: 0.881 or 0.839
Renesis
2nd: 2.269
3rd: 1.645
4th: 1.187
5th: 1.00
6th: 0.843 (fixed!)
your mistaking the ability to bandaid a car, with actually building a proper transmission and final drive combination.
case in point, the mazda competition gearbox was coupled with 4.88 final drive. the competition box has a proper looonnnggg first gear, followed by well measured small drops between shifts through 5th.
mazda comp
1st: 2.350
2nd: 1.608
3rd: 1.240
4th: 1.00
5th: 0.881 or 0.839
79-83 12a
1st: 3.674
2nd: 2.217
3rd: 1.432
4th: 1.00
5th: 0.825
87-88 turbo ii
1st: 3.458
2nd: 2.015
3rd: 1.391
4th: 1.00
5th: 0.762 (0.806 Japan)
Renesis
1st: 3.815
2nd: 2.260
3rd: 1.536
4th: 1.177
5th: 1.00
6th: 0.787
miata
1st: 3.136
2nd: 1.888
3rd: 1.330
4th: 1.00
5th: 0.814
the downside is, all the oem boxes we can readily get these days basically suck. The "best option" would actually be a kennedy T5 adapter then a proper motorsport gearset for the T5 (since they are cheap). Other options would be OS giken if they are still making things, or maybe Pfitzner.
the miata box is about the best due to a longer first but is still nothing like the comp box. the shift into second isnt bad. The rx8 essentially has a typical, streetability useless for racing first gear.
the final drive is more or less relative to the speed of the track your driving on, with consideration given to the torque produced by the engine. choosing a gearset that gives the best rpm drop between shifts keeps you in the power band. adjusting the final drive essentially adjusts overall acceleration and speed in gears.
the factory Rx-8 final drive was bumped up after 09 to about a 4.77 as i recall, which is not the same thing as a kia sporage gearing swap. I am unaware in the ring and pinion works in the 8.
case in point, the mazda competition gearbox was coupled with 4.88 final drive. the competition box has a proper looonnnggg first gear, followed by well measured small drops between shifts through 5th.
mazda comp
1st: 2.350
2nd: 1.608
3rd: 1.240
4th: 1.00
5th: 0.881 or 0.839
79-83 12a
1st: 3.674
2nd: 2.217
3rd: 1.432
4th: 1.00
5th: 0.825
87-88 turbo ii
1st: 3.458
2nd: 2.015
3rd: 1.391
4th: 1.00
5th: 0.762 (0.806 Japan)
Renesis
1st: 3.815
2nd: 2.260
3rd: 1.536
4th: 1.177
5th: 1.00
6th: 0.787
miata
1st: 3.136
2nd: 1.888
3rd: 1.330
4th: 1.00
5th: 0.814
the downside is, all the oem boxes we can readily get these days basically suck. The "best option" would actually be a kennedy T5 adapter then a proper motorsport gearset for the T5 (since they are cheap). Other options would be OS giken if they are still making things, or maybe Pfitzner.
the miata box is about the best due to a longer first but is still nothing like the comp box. the shift into second isnt bad. The rx8 essentially has a typical, streetability useless for racing first gear.
the final drive is more or less relative to the speed of the track your driving on, with consideration given to the torque produced by the engine. choosing a gearset that gives the best rpm drop between shifts keeps you in the power band. adjusting the final drive essentially adjusts overall acceleration and speed in gears.
the factory Rx-8 final drive was bumped up after 09 to about a 4.77 as i recall, which is not the same thing as a kia sporage gearing swap. I am unaware in the ring and pinion works in the 8.
the kia sportage front diff houses a 4.77 7 inch gear which will fit the short pinion 7 inch housings. aka the gslse, s2000 and miata.. the 4.77 in the rx8 makes that car move check this video I found on youtube.
Also lets not forget the cost of getting the rx8 box in the FC with the drive shaft. It would be cool to have a 6 speed
Excellent discussion we have here guys.
Respecognize!
Joined: Sep 2004
Posts: 4,106
Likes: 72
From: Anchor Bay, CA
i know the kia gears fit the short 7", two of my cars have that little gem of a mod. aside from highway crusing sucking ***, i love it
i was wondering about the Rx-8 differential itself and if it had interchange with anything.
i was wondering about the Rx-8 differential itself and if it had interchange with anything.
If you don't mind me asking how is day to day with the 4.7 gear modification?
Do you often start in second gear due to first being to short?
Is it more of a work out rowing though the gears constantly?
My corolla has a 6 speed with a 4.53... and it's damn near amazing, totally transformed the car
not sure if anyone cares lol here are it's ratios:
3.166 2.050 1.481 1.166 0.916 0.725
not sure if anyone cares lol here are it's ratios:
3.166 2.050 1.481 1.166 0.916 0.725
Joined: Mar 2001
Posts: 31,837
Likes: 3,234
From: https://www2.mazda.com/en/100th/
the M type, which is the 7" ring gear found in the R100/Rx2/3/4/5/7, all the RWD non turbo 4 cylinder cars, like the 94-05 miatas, S2000, and the KIA's.
the P type is the 8" ring gear, which is found in V6/turbo cars like the Rx8/FD/T2/mpv/929
Thats good to know personally I have never done a gear change in a car. I have heard the difference is night and day.
) the final drive went from 4.3 to 4.5 and it added an LSD....you'll have to jump at least to a 4.5 or 4.7 to make a big difference. I put 4.3s in my turbo FC and it made a difference, but I wouldn't say it was night and day or even a big difference... I would have gone for 4.77s but I didn't want to pay that much... 4.3s for TIIs are already expensive as it is.
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