hi there. just wondering on peoples experience/opinions of running the FD flywheel in an S5. will be reinstalling the engine soon, and just figured may as well help it spin a bit quicker. searched and came up with mixed reviews on a lighter, 17lb rb flywheel. but couldn't find much input on people running the fd. 19lbs seems like it would be kind of right in the middle, since the original is 3lbs heavier. car is just for daily driving..for now
as always, much appreciated

 

Are you using a turbo or NA trans? That will determine your clutch, which determines your flywheel.

I really like the lightweight steel flywheels on the NA's I've driven (17 vs 24 lb). Aluminum ones seem too extreme. In my case, using the ligher flywheel was a big difference. You many not notice the 2lb difference as much.

But if you have both sitting around ready to go, I'd use the FD one.

 

turbo trans. s4, if it makes a difference. i don't have both though. but can get one for about 40$. figured it would be worthwhile since the engine is out anyways. didn't know the na wheel was even lighter. as mentioned, had heard mixed reviews on the 17lbs aluminum flywheel for turbo app. so a 17lbs steel wheel would feel different from a 17lbs aluminum?
thank you for the reply

 

Well the NA and turbo ones are not interchangeable, because of the pressure plate bolt pattern.
Check out the weight chart here. Rotary Resurrection home of the budget rebuild.

And Mazdatrix description of flywheel/clutches Flywheel and Clutch Explanations

They will be able to tell you more than me. Just so we're clear, you'll need a turbo clutch/flywheel due to your turbo trans. So your options are S5 turbo, FD, Steel turbo, Al turbo.

If it were me, I'd go FD.

 

hmm. but then you could probably use an na wheel on a turbo motor/trans if you matched the PP, no? hypothetical, i suppose. but curious nonetheless. or are the splines different for the input shaft between turbo and na?
and it is possible to run the fd wheel on an s5 turbo engine, yes? i had just assumed that because the rotors/counterweight is the same and the wheel is the same size that it would work. assumed...
and hey, thank you for taking the time to dig up those links. really appreciate that.

 

I am assuming If the internal rotor weights are the same then you can run an Fd Flywheel in an S5 TII.
Can't run a N/A flywheel in a TII trans.Starter won't hit.Different size Flywheel too.
The Flywheel must match the transmission..and Yes,it is because if the trans input shaft spline.

 

ahhh yes. the starter lol. my trans is an s4 turbo though, along with the rest of the car. engine is s5. will the fd wheel still work with the s4 t2 trans?

 

S4 and S5 TII transmissions are interchangeable, and the integrated counterweights make S5 and FD flywheels interchangeable, but not S4 (heavier rotors).

 

ok cool. that's pretty much what i figured. especially since the aftermarket flywheels all list 89-99
thank you all for the responses

 

Most aftermarket light flywheels do not have the rear counterweight,so be aware that you have to get that part separately.
..and it must match the series engine(S4 Counterweight for s4 engine,s5 for s5.)
Now I am sure that light steel would have the counterweight incorporated as part of the flywheel.( I could be wrong though,so someone correct me if so.)