Post by
NateDogg »
https://forums.nicoclub.com/natedogg-u710.html
Tue Sep 29, 2009 6:35 am
Clutches are rated for tq, not HP.
If you want to push a 55-60mm turbo to 500whp, you will have more torque than pushing a 65mm turbo to 500whp at less boost and later boost threshold.
After a lot of research, I bought a South Bend Stage 5. Even with a chromoly flywheel, it is very smooth to drive but is rated for 475 tq.
I have it at 20psi on a BW S256 with no issues.
I would recommend this setup or a Spec with the upgraded diameter.
Good luck with your decision.