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Old 03-26-2007, 03:30 PM   #1
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Default RX7 fd3s transmission in my MX5

The miata transmission is very nice, but can't handle safely more than 250 WHP.

At stock situations or at light turbo setups you 'll not deal with problems, but with 300+ WHP the 2th or 3th gear sometimes will gone

So there are two solutions
1)exotic stuff gears (os giken, quaife etc) but very expensive
2)adaptate transmission from another car, more inexpensive from the first solution but very difficult to do a perfect job.

So I put a turbo trans model "R" from RX7 fd3s (93-95).
It was from the beginning a difficult modification but the engineer succeed in this 100%.

The gear lever is exactly in the same position like the stock, and the "sense" of changing gears maybe is better than a stock transmission miata.
The 1-2-3d gears are a little shorter than stock gear ratio
The 4th is the same 1:1 ratio
And the 5th is much longer than stock ratio!! And this is very nice for a 340+ hp turbo miata!.

The modification based to a new housing between the block and the RX7 transmission. We modificated the miata housing (bellhousing? ) and connect to its end, the end of the RX7 housing.It was a very difficult job because it had to be perfect at straight line with the stock one.
You will see at the fotos what exactly we have do because my english are not so good to explain exactly what I want to tell.
The driveshaft was cut and modificated to match to the RX7 transmission.
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RX7 fd3s transmission in my MX5-sasman2.jpg   RX7 fd3s transmission in my MX5-sasman3.jpg   RX7 fd3s transmission in my MX5-sasman1.jpg  
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Old 03-26-2007, 03:43 PM   #2
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How much did this cost?
Is it cheaper than purchasing the Quaife gearset offered through FM?
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Old 03-26-2007, 03:46 PM   #3
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I dont suppose you took any pictures of the process of doing this?
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Old 03-26-2007, 04:05 PM   #4
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Of course is very very cheapper than buying the gears!
It's the best value for money solution.

The pictures are from the mobile phone, and I think I have not pictures of the process.
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Old 03-26-2007, 04:12 PM   #5
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FD trannies on car-parts.com are $500-1000, FWIW.

Getting the bellhousings cut and welded right is what will cost, if you don't weld.

Frank
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Old 03-26-2007, 04:56 PM   #6
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so what about the tail? does the FD tranny have a ppf that matches ours?
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Old 03-26-2007, 05:10 PM   #7
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no, you would need to modify it to retain the ppf. Or just make a custom mount for the tranny and the diff.
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Old 03-26-2007, 06:30 PM   #8
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The adapter plate seems to be the cheapest solution - guys were doing that for around $300. Welding up that front to the rx7 trans and keeping it aligned was a task indeed.
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Old 03-28-2007, 12:31 AM   #9
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friggin sweet i love junk yard shopping LOL
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Old 03-28-2007, 04:44 AM   #10
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hmmm this maybe in my future. Closer pictures of the area you welded will help alot. What type of welding did you do this with?
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Old 03-28-2007, 06:39 AM   #11
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Is there much difference between FD and FC transmissions? I have 3 Turbo II transmissions that I was thinking of using. And with the Price of torsens I as thinking about doing the 8.8 swap to get a bullet proof driveline.

Also wouldn't you have to get a custom clutch disc? Being that the input shaft splines are different?
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Old 03-28-2007, 10:33 AM   #12
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No. The big difference is that the FD is setup for a ppf on the exhaust side. Nobody uses them for the swap because they cost more and it's the same center section as the FC tII. The FD rear has no "wings" for mounting, where the FC does. You need to resolve the hub/half shaft connection since the FD/FC shafts are larger. Going to the big rear though, only requires shortening the drive (propellor) shaft. Whereas keep the Miata rear would mean combining a Miata and FD/FC shaft. You will need a spline specific disk, but any clutch builder can do this since it's just swapping out the center hub.

Here's a good link on the subjects:
http://www.geocities.com/Crash41301/

Here's some excellent photos from the "miataroadster" guy- my guess is he'd make/sell you the plate:
http://billwilner.myphotoalbum.com/v...album07&page=1
- rob
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Old 03-28-2007, 11:53 AM   #13
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thanks Rob!
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Old 03-28-2007, 04:11 PM   #14
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Quote:
Originally Posted by m2cupcar View Post
No. The big difference is that the FD is setup for a ppf on the exhaust side. Nobody uses them for the swap because they cost more and it's the same center section as the FC tII. The FD rear has no "wings" for mounting, where the FC does. You need to resolve the hub/half shaft connection since the FD/FC shafts are larger. Going to the big rear though, only requires shortening the drive (propellor) shaft. Whereas keep the Miata rear would mean combining a Miata and FD/FC shaft. You will need a spline specific disk, but any clutch builder can do this since it's just swapping out the center hub.

Here's a good link on the subjects:
http://www.geocities.com/Crash41301/

Here's some excellent photos from the "miataroadster" guy- my guess is he'd make/sell you the plate:
http://billwilner.myphotoalbum.com/v...album07&page=1
- rob
The way you describe is not so good.

The reasons are:

1)The lever goes 10 cm back from the stock position
2)You have to cut chassis and modify many thinks to the car such as dowpipe etc, because the slave cylinder is from the other side.
3)It' more difficult to do, more difficult to succes the distances at the adapter plate etc
4)FD 93-95 trannie is better than an FC trannie because it's the latest version of "R" series mazda transmissions.
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Old 03-28-2007, 05:15 PM   #15
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Nick i cant believe you arent versed IN BD lore or old you dissapointed me there. :(
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Old 03-28-2007, 05:43 PM   #16
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what about www.racingmazda.com ? Anybody have an FC rear from them?
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Old 03-28-2007, 05:57 PM   #17
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RacingMazda :(

I am still waiting for a simple answer to my e-mails (10 of them) about their 3 inch cat's.

I would not trust them with my money.
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Old 03-28-2007, 06:52 PM   #18
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Quote:
Originally Posted by magnamx-5 View Post
Nick i cant believe you arent versed IN BD lore or old you dissapointed me there. :(


I am versed.....lol.... but I was just wondering why he was using a FD tranny when you can get FC trannys for a buck fifty. Plus I have 2. Just wanted to know the hoopla bout the fd tranny
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Old 03-28-2007, 06:55 PM   #19
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Sell me one of your TII trannies one the cheap!!!
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Old 03-28-2007, 07:00 PM   #20
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BTW SCREW racingmazda.....go hard core http://www.racingconcepts.net/product.html
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