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RX8 6speed gearbox on RX7 FC 13b s4 NA

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Old 09-21-10, 11:07 AM
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RX8 6speed gearbox on RX7 FC 13b s4 NA

Hi

Can anyone tell me if is possible put a rx8 6speed gearbox in my rx7 fc s4 13b 6port NA?

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Old 09-21-10, 11:11 AM
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FAQ?

https://www.rx7club.com/showthread.p...49#post5131249
Old 09-21-10, 11:12 AM
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It's not a simple bolt-in affair, but it can be done.

https://www.rx7club.com/search.php?searchid=8984252
Old 09-21-10, 11:15 AM
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lol why?
Old 09-21-10, 12:01 PM
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OK, sorry, I forgot do some search! I thought that the rx8 gearbox is a shorter gearbox, a racing box, but I was wrong!

Regards
Old 09-21-10, 02:41 PM
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Rx-8 transmissions are glass, at least until the 2009 models
Old 09-21-10, 02:44 PM
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they can't even hold up to the stock power levels of the 8... they would only be considered a racing transmission if you like to shift constantly.
Old 09-22-10, 12:28 AM
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Why would you want to change the tranny? the FC tranny is bulletproof
Old 09-22-10, 12:56 AM
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Originally Posted by OkiRotary
Why would you want to change the tranny? the FC tranny is bulletproof
The turbo transmissions are bulletproof. The NA transmissions are garbage. Weak gears, weak syncros, and most are pretty much mush after 20-25 years.
Old 09-22-10, 01:06 AM
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Originally Posted by 20Bforme
lol why?
6 speeds are gangster. Seriously. Whenever I go from driving my 6 speed 350z for a period of time and then switch to the FC it is the MOST glaring difference between the two.

Performance and drivability is better. The close ratio 6 speed keeps you in whatever RPM range you are trying to drive in at the moment much better than a 5 speed. You have to drive one to truely understand. It's feel, more than numbers.

I would love to put a 6 speed in my FC. I don't think there are any options for a TII though as the RX-8 and Miata transmissions would fail faster than I could install them.

Has anyone on the forum installed a 6speed on a FC? NOT counting the V8 swapped FC's with the Vette 6speed (still gangster).

Steve
Old 09-22-10, 08:34 AM
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Originally Posted by 13bpower
6 speeds are gangster. Seriously. Whenever I go from driving my 6 speed 350z for a period of time and then switch to the FC it is the MOST glaring difference between the two.

Performance and drivability is better. The close ratio 6 speed keeps you in whatever RPM range you are trying to drive in at the moment much better than a 5 speed. You have to drive one to truely understand. It's feel, more than numbers.

I would love to put a 6 speed in my FC. I don't think there are any options for a TII though as the RX-8 and Miata transmissions would fail faster than I could install them.

Has anyone on the forum installed a 6speed on a FC? NOT counting the V8 swapped FC's with the Vette 6speed (still gangster).

Steve

did you read the FAQ on the 6speed install?

and FYI, i used to own a car with a 6sp. while being a blast to drive, i found that last gear to be less than useless... a 5sp would just been fine.
Old 09-22-10, 09:03 AM
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Originally Posted by 13bpower
The turbo transmissions are bulletproof.
Oh they have their limits, trust me.
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Old 09-22-10, 10:57 AM
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Originally Posted by 13bpower
Has anyone on the forum installed a 6speed on a FC? NOT counting the V8 swapped FC's with the Vette 6speed (still gangster).

Steve
yes. the problem with the rx8 trans is that in the FC the shifter is in the radio, so you need to find a shifter assembly from one of the other cars that use that trans, and it works.

i have not done it myself.
Old 09-22-10, 11:01 AM
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Originally Posted by 13bpower
6 speeds are gangster. Seriously. Whenever I go from driving my 6 speed 350z for a period of time and then switch to the FC it is the MOST glaring difference between the two.

Performance and drivability is better. The close ratio 6 speed keeps you in whatever RPM range you are trying to drive in at the moment much better than a 5 speed. You have to drive one to truely understand. It's feel, more than numbers.

I would love to put a 6 speed in my FC. I don't think there are any options for a TII though as the RX-8 and Miata transmissions would fail faster than I could install them.

Has anyone on the forum installed a 6speed on a FC? NOT counting the V8 swapped FC's with the Vette 6speed (still gangster).

Steve
Why don't you be the first...
How much money do you have?
Old 10-17-10, 09:58 PM
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Originally Posted by j9fd3s
yes. the problem with the rx8 trans is that in the FC the shifter is in the radio, so you need to find a shifter assembly from one of the other cars that use that trans, and it works.

i have not done it myself.
a Mazdaspeed miata uses the same 6 speed trans with a different bellhousing and tailshaft housing

the miata trans tailshaft with place the shifter further back (closer to the actual shifter hole)

But how much im not totally sure But id buy the miata trans and get the rx8 bellhousing So you dont have to change the internals just modify the input shaft abit
Old 10-17-10, 10:40 PM
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Originally Posted by arghx
Oh they have their limits, trust me.
Tell me about it. I will be putting in my fourth TII trans at some point because the syncros keep going.
Old 10-17-10, 10:45 PM
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Originally Posted by 13bpower
6 speeds are gangster. Seriously. Whenever I go from driving my 6 speed 350z for a period of time and then switch to the FC it is the MOST glaring difference between the two.

Performance and drivability is better. The close ratio 6 speed keeps you in whatever RPM range you are trying to drive in at the moment much better than a 5 speed. You have to drive one to truely understand. It's feel, more than numbers.

Steve
The number of gears is irrelevant, the gear ratios are what matter. The 6sp in my Subaru isn't that much greater then my RX7, except for on the highway when I am just cruising. Even then its all about the gear ratios in the box, not the the fact that one is in 6th and one is in 5th.
Old 10-17-10, 10:51 PM
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its better and easier to swap out a miata trans rather than the rx8
Old 10-18-10, 06:29 AM
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Originally Posted by 13bpower
The turbo transmissions are bulletproof. The NA transmissions are garbage. Weak gears, weak syncros, and most are pretty much mush after 20-25 years.
I think that Aaron Cake's Tina proves this is not true.
Old 10-18-10, 12:54 PM
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Originally Posted by Bwek
a Mazdaspeed miata uses the same 6 speed trans with a different bellhousing and tailshaft housing

the miata trans tailshaft with place the shifter further back (closer to the actual shifter hole)

But how much im not totally sure But id buy the miata trans and get the rx8 bellhousing So you dont have to change the internals just modify the input shaft abit
i have had the miata and rx8 next to each other and the rx8 trans guts are WAY beefier.

but that being said i didn't look at how swappable the case stuff is, and it is at some point because there IS a shifter combo between the rx8 and miata that works
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