What determines how much clutch holds? I thought it was the pressure plte since i is what applies the pressure to the disc...... My question is does the disk it self have much to do with how much power it holds?

 

bump!

 

The friction material that the clutch disc is made of is a key aspect that determines how much power the clutch can handle. This is why when the clutch disc wears out it really doesn't matter if the pressure plate is still applying alot of pressure, the clutch disc will still slip.

 

There are many variables to how much TQ a clutch can hold.
Disk Material, Pressure plate clamp load, Flywheel surface material ect.
Here is a TQ calculator that can give you a basic idea of how much a certain disk material and pressure plate clamp load can hold. http://www.zoomclutch.com/torque_calculator.html
FYI, A 350Z clutch facing on the disk measures about 9.85"x6.125"
Most of the common materials are listed there except the "Feramic" material that it used in the DxD clutch kits I offer.
Feramic has a .67 Coeff of friction.