So here is my situation.

I have a s5 turbo chassis with a s4 NA motor. I am trying to mount the s5 T2 transmission on the the s4 NA motor but I am just wondering what setup i need? Should i be getting an s5 turbo clutch, and flywheel, or s4 turbo? Also I am kinda confused about the counterweights, would i need to change my out?

Thank you please let me know.

 

IIRC the clutch is the same between the S4 and S5 turbo. You need the flywheel/ counterweight to match the engine so you need either a S4 factory TII flywheel or a S4 counterweight and an aftermarket lightweight TII flywheel for your S4 n/a engine to work with the TII transmission..

 

oh ok thank you so much! Just wondering why it has to be a lightweight flywheel? And i only need to change the counterweight on the transmission side right? And just to get this straight a na and t2 counterweight is different?

 

It doesn't have to be a lightweight flywheel. You can use the stock one. It might be easier to find a lightweight aftermarket one than a stock TII flywheel, though more expensive, I'm sure. If you get a stock flywheel you don't need the counterweight as it is part of the flywheel. On the aftermarket lightweight ones it is not part of the flywheel so you need the rear counterweight from an auto transmission car from the same series as your engine. The flex plate of the auto bolted to the counterweight which attaches to the engine the same way that the manual flywheel does. The aftermarket flywheel attaches to the counterweight like the auto flex plate does.

Yes only need the counterweight for the transmission side.

Auto trans N/A and TII use the same counterweight within the series. So there is a S4 counterweight and a S5 counterweight. Note that Autos were only available on the N/A in the U.S. but IIRC you could get and auto TII in Japan. They would both use the same rear counterweight for the series the car is.

 

OK! Thank you so much this actually helps alot! So did only the autos come with counterweights, and the manuals dont? If so why does a manual not need a counter weight and auto does? And if manual doesnt why would you need to put it on the setup?

 

Counterweight on a manual car oem flywheel is built into the flywheel. Aftermarket lightweight flywheels do not have the counterweight built into the ffkywheel. It keeps the SKU’s down as you can just add the engine series counterweight.

If running an aftermarket flywheel, you need to add the engine series counterweight to the flywheel.


look at a flywheel and a flex plate and think about the differences in mass, and the fact a torque converter would bolt to a flex plate and it starts to make sense from a manufacturing standpoint.

 

ok yeah that makes sense, just wanna really make sure NA s4 and T2 s4 counterweights are the exact same? I have been told they arent so i just want to really make sure

 

Maybe a different way to phrase it is. Only the autos came with a separate counterweight. As DR Knight said the counterweight is built into the OEM flywheel. Look at how the stock flywheel is made Identifying and Weights of Flywheels | Mazdatrix
vs. an aftermarket one and it becomes clearer. FLYWHEEL STEEL, 87-11 TURBO + RX8 | Mazdatrix

Mazdatrix only lists one rear counterweight for the 86-88 13B. REAR COUNTERWEIGHT, 13B 86-88 | Mazdatrix It works for either engine

 

ok that info helps alot actually, I was thinking so since i have a stock counterweight on my motor already which would be a NA s4, could i just use that NA s4 counterweight on a aftermarket T2 s4 flywheel for my setup?

 

Before that can be answered I have two questions because you have not said what transmission is currently in the car.
1. Are you currently using an automatic transmission?
2. If a manual transmission does it have an aftermarket lightweight flywheel?
If the answer to both of these is No, then you don't have a counterweight to use on an aftermarket TII flywheel. Only autos had a separate counterweight. A stock flywheel for a manual trans has the counterweight built into it. It cannot be removed from the flywheel.
If the answer to either is Yes, then yes you can buy a lightweight TII flywheel and put your S4 counterweight on it.

 

OHH i totally get it now, so basically i need a aftermarket T2 flywheel with counterweight or s4 T2 factory flywheel.

 

Yes. That's correct.