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Old 02-22-10, 11:46 AM   #1
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NY RX8 6 speed Transmission swap

I'm certain that there is a FAQ topic some where on this board covering this swap into the RX7 but I can't seem to find it. I have in my possesion one low mileage rx8 trans that I have been wanting to stuff into something small and british (MGB) along with a 13b. I have established that that the bolt pattern is the same, but I'm not sure what clutch setup would be required. Any thoughts or a link would be appreciated.
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Old 02-22-10, 12:05 PM   #2
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Well, it is mentioned in the 2nd gen FAQ here: http://www.rx7club.com/showthread.ph...49#post5131249, but since the RX8 transmission is different length & has weaker gears than TII transmissions, virtually no one would swap it into an RX7. Your case is obviously different.

I did some searching around, and it looks like RX8s use the same 225mm clutch disk as NA FCs. The input shaft splines are apparently the same too. So, if you're using an NA 13b engine, the existing flywheel and clutch should work.
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Old 02-22-10, 12:26 PM   #3
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Thanks for your help. Would this transmission be out of place in a first generation Rx7?
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Old 02-22-10, 11:01 PM   #4
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The RX-8 actually used the same size flywheel and clutch as the FC Turbo and FD transmissions (240mm).

The RX-8 transmission is basically a modified Miata gearbox, the 04-08 transmissions are notoriously weak (bad shift forks and half shaft) and there are few options for stronger rebuilds that make economic sense.
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Old 12-08-12, 12:00 AM   #5
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Turbo8 is correct, here is a link to Racing Beat's page:

Rotary Tech Tips: Transmissions
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Old 01-21-13, 06:48 PM   #6
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Anyone know any other clutch slave cylinders that will work with the 6 speed on the FD swap? Since the Rx8 cylinder is too long and hits the 7's engine oil filter.. There has to be an easy swap to a shorter different slave cylinder that matches the bolt patters of the 8's tranny and does not hit the oil filter on the FD.. I will have to mix and match cylinders until I find the right fit if no one knows of one already..
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Old 04-07-13, 11:29 AM   #7
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After looking for clutch slaves that look alike and might fit, I bought a slave cylinder from a 2005 Mitsubishi Eclipse 2.4 L and "Made it fit" (just hasn't been tested as of yet) but looks like it aligns properly just have to see if it will hold the pressure since the two mounting holes had to be drilled out bigger to match the mounting threads and it needed to be spaced upward unevenly to the right angle, it needs to use the 8's slave cylinder push rod as well...

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Old 04-07-13, 07:50 PM   #8
6speed in an rx3????
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2005 Mitsubishi Eclipse huh??? I will have to remember that! I used one from an early 90's Honda on my rx3 6speed conversion. It may actually fit a little better than the Eclipse one because I didnt have to use the spacer bolts but good job finding one that worked!!! I like it!
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Old 04-08-13, 11:24 AM   #9
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Quote:
Originally Posted by 73rx313b View Post
2005 Mitsubishi Eclipse huh??? I will have to remember that! I used one from an early 90's Honda on my rx3 6speed conversion. It may actually fit a little better than the Eclipse one because I didnt have to use the spacer bolts but good job finding one that worked!!! I like it!
What model and year clutch slave cylinder did you use to be specific ? Post up some pictures, this is the perfect thread to do so. I might have to try your choice of cylinder if this one does not work out for me and everyone else will have some reference and starting points if they decide to go 6 speed..
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Old 04-09-13, 12:53 PM   #10
6speed in an rx3????
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I will have to dig up the part# and info on it but it seems like it was a 91-92 Civic but dont quote me on it just yet. You can check my build thread for pics... I think there are a few in there.
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Old 02-22-14, 11:33 PM   #11
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Did you manage to track down the part number for the honda slave cylinder mate?
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Old 02-23-14, 09:55 AM   #12
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Quote:
Originally Posted by VICEdOUT View Post
...Since the Rx8 cylinder is too long and hits the 7's engine oil filter.. ..
Not certain of exactly what your dealing with or clearances you need, but GReddy (and possible others) make an oil filter relocating kit.
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Old 02-23-14, 01:45 PM   #13
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It would hit the adapter assembly as well I believe, it's the lower part of the pedestal that will hit as well as the bottom of the oil filter.. I tried the early 90's Honda slave cylinder actual part number that you or someone else gave me in a different thread about the 6 speed to FD setup and it did not look like it would fit either, I went to Auto Zone and asked for it and looked at it next to the 8's cylinder and it has the banjo bolt for the clutch reservoir line stick out the back as well so I didn't even bring it home to test fit.. So far the 2005 Eclipse cylinder is the shortest, best fit for it with some modification of the mounting holes.. I would like to believe there is a perfect direct bolt on clutch slave cylinder out there that would work even better but has not yet been discovered ? ? ?
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Old 06-21-14, 06:29 PM   #14
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Just refreshing the thread for a little bit of informative facts, Hey 73rx313b, the Autozone Duralast part # 13090 Cs2162 Slave Cylinder fits perfectly thanks again ! Altho the Eclipse Cylinder worked good too as far as pushing the rod in far enough, the one 73rx313b mentioned works and fits much better for anyone doing the 6 speed FD swap. On another note, I could not get it into gear with the engine running, after a long hybernation period, I finally started my FD engine and it fired right up, reved up real nicely too, but would not go into gear, with the engine off it does, but with engine on it does not. It seems as if it is pushing the rod in TOO much and I could feel the pedal max out before hitting the metal, I've played with the clutch pedal adjustment screw too with no luck. Maybe my combination of Rx7 and Rx8 clutch components did not work but I have a 93 FD Rx7 engine with 04 Rx8 Tranny, with FD Pressure Plate, Rx8 Friction Disk, Fidanza Aluminum Flywheel I had since my Rx8 engine (which is the exact same Fidanza flywheel used for either FD or Rx8) and the Rx8 Throwout bearing with an Rx7 Pilot bearing in the Eshaft. I'm guessing the setup does not like the FD's Pressure Plate and I was going to re buy another Rx8 Pressure Plate to try that, the Rx7 PP's arm splines seem like they are sucked in, compared to the Rx8 PP arm splines are longer and stick outward more, perhaps I need to use a Rx7 throwout bearing instead but I will try the Rx8 PP first.. What clutch components and setups are you FD with 6 speed tranny guys running ? Any thoughts or insight in the matter would be greatly appreciated.
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Old 06-21-14, 06:29 PM
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