If I were to put a Turbo II transmission on a '91 coupe would I want to buy a clutch and flywheel designed for a turbo II or an NA? Do I need a Turbo II driveshaft or is there no difference?

 

Never did this, but let's see how close I come:
From an S5 TII:
Flywheel and clutch assembly
If S5 TII trans, need S5 trans mount
IFS4 TII trans, need S4 trans mount
From TII:
Starter
Driveshaft
Diff and axles
Slave cylinder and rod

There are options avaiable with the d/s though, Mazdatrix has a TII trans to N/A diff for @ $300.

If I'm incorrent they will let me know.

 

You need a TII to N/A Driveshaft. You need TII flywheel & clutch.

 

wasn't there something about the counter weights being on the flywheel/part of the flywheel though? t2 flywheel might be different therefore throwing the rotating assembly out of balance for the NA engine. not 100% on this but the gurus will chime in I'm sure. I'd wait for answer to this question just to be sure because if it's not in balance it will cause damage to the engine over a short time. I think.lol. I read a LOT of random threads in the FC section over the years.

 

TII and N/A rotor weights are the same. You got out of balance if you use different series components, not between vehicle trim level.

 

You are spot on but your information presentation is misleading in some ways.

To put a TII trans on you absolutely need:

-TII Transmission Crossmember and Y for the transmission series
-TII Slave Cylinder and Rod
-TII Flywheel with matching series counterweight (stock or aftermarket with bolt on counterweight)
-TII Clutch/Pressure Plate
-TII Starter

Then you must do one of the following

- Buy the mazdatrix TII trans to N/A Diff driveshaft
- Get a TII Driveshaft, TII Diff, and TII Axles

 

In order to save yourself a lot of custom machining work...

Assuming you still have the 91 engine, use a TII Clutch and an 89-92 TII flywheel. As indicated in a previous post, also use a TII starter and TII clutch slave cylinder. (The clutch slave cylinder body is different, but the piston is the same, so you can keep the NA piston if you like, although I think it is better just to buy a complete TII unit).

If you use a TII driveshaft then you will also need a TII differential and TII halfshafts. Otherwise, you can use the Mazdatrix custom driveshaft to mate the TII transmission to the NA differential.

My coupe has a TII transmission mated to an NA flywheel and clutch pack. It can be done, but it takes a serious amount of work. Also, some people modify the driveshaft to fit, but I would highly discourage a novice from trying this.

 

i am currently trying to replace the transmission on my 91 vert for a t2 tranny. how did you get the t2 trans to work with the na clutch and flywheel? and what did you do aboout the slave cylinder?

 

I'm just guessing, and maybe he will chime in though he's not posted in awhile, that he had to modify how the starter mounts somehow so it would engage the ring gear on the flywheel.

Your easiest and probably cheapest path is to get a stock S5 TII flywheel. If you can afford it I would get a lightweight flywheel of your choosing and a S5 counterweight. It is just as easy as using the stock one just more expensive. I think it really is a nice upgrade over the stock flywheel. With either one the get the TII clutch of your choice.

 

yah I figured it had to do with that. I already ordered the flywheel clutch and weight because my na transmission is screwed and I’m going to get a t2 from a guy nearby. What about connecting my clutch master cylinder to the t2 slave cyclinder. Would you happen to know if the hose will just screw in or would I need some kind of adapter?

 

FWIW, I do believe that the splines on the input shaft are different from the T2 to the NA.

This means either finding a friction disc that has NA dimensions but T2 splines (not sure if this exists, but maybe a part from a different car matches the specs) or modifying / replacing the input shaft on your T2 transmission to match the NA clutch. Which is a lot of work considering there are off-the-shelf parts that work without any fabrication.

And after that, you still end up doing all that work for the smaller NA clutch disc. Maybe if you can do the fab work it's more worthwhile, but I recommend just getting the T2 clutch and flywheel.

 

Just buy this: https://www.mazdatrix.com/product/cl...all-stainless/ It fits either one. I'm guessing the difference between the two hoses is the length. The fittings on the end are the same.

 

Pardon me if said already, skimmed through thread.
I thought the rotors and shaft have to be balanced with a new flywheel to avoid excessive vibrations which (will certainly) reduce engine lifespan?

 

yes but only if you’re switching to a lighter flywheel. And it only matter what year the engine is. Turbo or no turbo manual or auto should be the same counterweights. Or this is my understanding so far.