198713bt

iTrader: (2)

I am rebuilding my S4 TII, and have found a lead on a set of S5 TII rotors that are supposedly in decent shape. I have searched on here to see if I can run S4 TII irons and housings with S5 TII rotors, but only found one vague thread about it. Can anyone tell me for sure if this setup will work and what possible issues I could run into? Any ECU, or tuning issues? I need to know by this weekend if possible. Thanks to whoever responds.

MadScience_7

You have to match the front and rear counterweights (or flywheel if you are using the factory one) with the rotors to balance the rotating assembly. N/A vs TII doesn't matter on the counterweights, just S4 vs S5. The flywheels are different for all though. In order to match balancing, you need to use the same series, and in order to match the clutch/transmission, you need to match turbo vs N/A. As long as you do that, you can use whatever irons and housings you want.

198713bt

iTrader: (2)

sweet, thanks for the quick response. would it be of any benefit to run s5 tII rotors over s4 tII rotors?

hiroichi1515

iTrader: (17)

S5 front counter weight - S5 TII rotors - S5 rear counter (if aftermarket flywheel) or S5 TII flywheel (stock)

MadScience_7

S5 rotors have a higher compression ratio than S4 and they are also slightly lighter. If you have the option, it is better to run the S5 rotors, but all else being equal, I don't know if there is any data on how much power you gain from just that. Might be significant, might not. There were many more changes in the S5 than just the rotors to give them more power.

198713bt

iTrader: (2)

alright, sweet. thanks for the info guys!!