autopaul

ok, i have been doing research on how to adapt a turbo 2 tranny onto a 12a
seems like the most popular way, as far as connecting to the engine goes is to get a 12a automatic counterwieght, lightwieght turbo2 flywheel, and turbo2 clutch&accessories, thats as far as connecting to the engine, the mounts and driveshaft must be custom, etc...
now this is all fine and dandy, other than after finding those specific parts which i have been looking for, for a a while with no luck in finding them, ( auto counterwieght, mainly) i noticed one person on the forum i dont remember who was running a custom clutch disk,!!!!! what a great idea, why not buy a good aftermarket 12a clutch that has lots of clamping force and just get some shop to re rivet the center of a turbo 2 clutch on there, because the only difference is apperently the spline size. well i got thinking after a little while and thought that it could be even simpler yet, why not just get a turbo 2 inner disk and use it inside your 12a pressure plate and flywheel, this would be ideal for people that have lots of power, and have already spent allot of money on a lightwieght 12a flywheel good clutch etc,

its just an idea, but it might just work, anybody else ever thought of this, or is custom the only way to go,

heres a link of what made me think of the idea, it seems so simple its stupid, my only concern is that the inner clutch is a different diameter,... i hope it isnt though,
http://www.mazdaracing.com/clutchflywheel.asp

peejay

To use the adaptor disk, requires that you use a RX-3/RX-4/RX-5 Cosmo/REPU bellhousing. The T2 bellhousing won't allow the starter to mate with the N/A flywheel.

Good farkin' luck.

autopaul

i heard you can die grinder the holes for the starter, and move it over a bit, i may be wrong, but i may be right, anyone else have any input??

hammmy

Why are you wanting to put a beefy TII tranny on a 12A?

DJAngelicon

Maybe to pull hard? O_o I don't know just guessing. lol

steve84GS TII

The mount is a piece of cake.You can use the stock first gen crossmember and rubber mount.Theres just a little grinding to clear everything and drill a couple holes.Then some 1" spacers between the crossmember and the body to correctly space the trans from the tunnel.

hammmy

Need to swap the combustion end of the drivetrain then, lol.

willkill12a

may as well add a 13b while your at it. i wish i could afford a 20b (3 rotor) that would be sweet in a 1st gen. can you say sleeper

SS124A

a well built 12A is sleeper enough....

I actually have this on my list of things to do... I have collected all the parts, I just need to do it....

I will do it as such:

74-78 RX-3 bell housing,
87 TII Gear box.
74-78 RX-3/4 tail-shaft housing..... (Could use the TII tail-shaft housing, but i have a good RX-3 version with the roller bearings already machined in).... this way will also prevent me from having to bore another hole in my floor....

For an FB (81-85) you can keep the TII tail housing... because the shifter location is the same.

I have decided to use the RX-3 bell housing instead of the TII so i can keep my SMALLER diameter... and already payed for... light weight flywheel......

I will be having a local drive-line/Clutch shop do as you suggested... and build me a custom 215mm clutch disc using the TII splined hub...

I am lucky to have a couple original Driveshafts for my car.... for your case you can source one from an SA and replace the trans side yoke with a Mazdaspeed hardened yoke which is made for use with the TII trans.

as others have eluded, why do you want to do this?

if it is just for *****, don't do it.. it is more hassle than it is worth...

my reasoning is because I have well over 200 whp, AND a 4.375 rear axle ratio..
using the TII gear box will give me an over-drive (5th gear...) and still provide a strong gear-box... I hate thinking about destroying my rob-case 4-speed.

WHile you are at it, you should try to obtain a Miata Shifter.

peejay

You can break a N/A tranny with a 12A, easy.

autopaul

well we dont need to debate whether i need it or not thats not what the thread is about.
ok, so getting a custom clutch disk works, but do you have to get an rx3 bellhousing, or can you just die grinder the starter holes to make it work??

hammmy

Of course, same as any other transmission in any other application. I'm wondering if this is for racing, or 3Krpm launches, or something else. Seems like overkill and a headache for a DD 12A--excepting the theoretical non-dyno'd gazillion HP versions I'm always hearing about . . .

-dave