anyone using JDM 5 speed transmission for track car?
I'm installing a new motor in the near future and was considering doing a new tranny also. Cant decide between S2 or JDM 5 speed. it will be paired with a 5.1 diff. if you have one for street or track, what's your feed back on it.
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The 5-speed is a must for a turbo car. Strength of transmission aside, the longer gears are necessary when dealing with a 4.44 rear end.
But for NA puproses, none of that applies... In short, this has been of no help to you :D: |
so the 5 speed is definitely stronger?
gear ration comparison jdm: 3.483, 2.015, 1.484, 1.000, 0.762 S1: 3.760, 2.269, 1.645, 1.187, 1.00, .843 S2: 3.815, 2.260, 1.640, 1.177, 1.00, .843 from the few tracks that I have driven on with the rx8 so far (stock s1 tranny and diff), i can't imagine any tracks where i would need to use 6th gear. but that might change once i install the 5.1 diff? the s1 and s2 5th is 1:1, and the 5 speed is 4th for 1:1, which mean i probably wont use 5th on the 5 speed neither. |
Brett has a turbo, a five speed and occasionally tracks his car. Hope that helps
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Originally Posted by trackjunkie
(Post 4866525)
so the 5 speed is definitely stronger?
https://cimg8.ibsrv.net/gimg/www.rx8...f0fca2f004.jpg |
My understanding is that the 5-speed is internally identical to the FD RX-7 TT transmission (and therefore the same as the FC RX-7 TII trans). If that's the case, it's very strong - it's what I'm using for my turbo Duratec build.
JV |
Originally Posted by John V
(Post 4866537)
My understanding is that the 5-speed is internally identical to the FD RX-7 TT transmission (and therefore the same as the FC RX-7 TII trans). If that's the case, it's very strong - it's what I'm using for my turbo Duratec build.
JV If a 5spd was readily available, I wouldn't be opposed to it. The FD transmission is still one the best I've ever shifted. |
is the 5 speed a direct swap? same clutch ect.
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Should be. I had to grind off a dowel that was on one of the upper passenger side bolt holes, but that was to fit a REW iron. May be a perfect fit for a MSP rear iron....
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Sorry, I don't have any experience with the 5-speed. But you mention the S2, which I do have.
The S2, with the 5.125 final drive, is a fantastic combination in the RX8. The transmission is super stout, and the gearing is awfully good for the track. 3rd climbs out of most corners incredibly well. |
I wanted to note that the 5spd does use a different clutch and flywheel (I visually confirmed this against a European 5spd/4port engine). I suspect that you can use a 6spd clutch, as long as you are also using a 6spd flywheel (or 6spd aftermarket LWFW). Your potential pain point will be input shaft spline count between 5spd and 6spd. I suppose it is also possible the clutch/flywheel diameter could differ, leading to possible bellhousing interference.
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Originally Posted by Mr. Pockets
(Post 4866664)
Sorry, I don't have any experience with the 5-speed. But you mention the S2, which I do have.
The S2, with the 5.125 final drive, is a fantastic combination in the RX8. The transmission is super stout, and the gearing is awfully good for the track. 3rd climbs out of most corners incredibly well. |
Originally Posted by trackjunkie
(Post 4866679)
good to hear that. any issues with increased diff temp with the 5.1?
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I am using the JDM 5-speed in my track car, 13B-REW engine, Rx8 Clutch. Fit right in place. Works very well! But I am turbo'd making 464whp. Someday would like to go sequential. But the 5-speed will do for now.
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5spd track car
Here is my RX8 at
Anthony Golden Rotor Racing & Rental https://cimg2.ibsrv.net/gimg/www.rx8...fdb2f4f2e5.jpg |
i ended up with a JDM 5 speed and never got around to putting it in,. . i do feel like im missing out though
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Just for the record because the information is becoming harder to find on teh intrawebz as time passes on, but the JDM 5MT has different 3rd &5th gear ratios than the EUDM 5MT transmission
JDM 5MT (note: identical to USDM FD3) 1st - 3.483 2nd - 2.015 3rd - 1.391 4th - 1.000 5th - 0.806 EUDM 5MT 1st - 3.483 2nd - 2.015 3rd - 1.484 4th - 1.000 5th - 0.762 (S1), 0.791(S2) these attachments are from a 2008 Mazda JDM sales brochure and a Mazda press kit for the British International Motor Show 2008 (BIMS08) https://cimg2.ibsrv.net/gimg/www.rx8...08b9cc805.jpeg https://cimg0.ibsrv.net/gimg/www.rx8...c5c480721.jpeg |
My collegue complains about his EUDM 5speed. It has a horrible drop in rpm from 3th to 4th. He is looking to swap in a 6speed. But by the looks of it, a jdm 5 speed would be a bit better too.
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Originally Posted by TeamRX8
(Post 4907264)
Just for the record because the information is becoming harder to find on teh intrawebz as time passes on, but the JDM 5MT has different 3rd &5th gear ratios than the EUDM 5MT transmission
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4 Attachment(s)
Not sure why it matters since the S1 and S2 used the same 5-spd manual transmission. Unlike the 6-spd, it didn’t change.
UK S1 brochure attached . |
Ok ...good to know .
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Well actually, the UK S1 brochure is showing a different 5th gear ratio: 0.762
They did update the R&P from 4.444 to 4.777 on the UK S2 5MT too. So overall less steep. The low-power engine needed that. . |
This shows how much more beefy the 5-spd PAR straight dog-ear gearset is for abusive/competitive purposes
https://cimg0.ibsrv.net/gimg/www.rx8...7d27e4e2c.jpeg https://cimg7.ibsrv.net/gimg/www.rx8...0104ca830e.png https://cimg3.ibsrv.net/gimg/www.rx8...865ac803a.jpeg https://cimg4.ibsrv.net/gimg/www.rx8...f4deb83c55.png |
Originally Posted by trackjunkie
(Post 4866580)
is the 5 speed a direct swap? same clutch ect.
Yes, the 5spd is heavier than the 6spd. While renting my car to others for endurance racing I had to keep reminding the drivers that the gearbox is an egg, so take your time with the gear changes. |
Well I’m looking for an RX8 5-speed. It can be broken because
the PAR gearset shown above will be going into it. |
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