Finally, the pressure plate is installed on top of it all.
The XClutch pressure plate has a clamping force of 3300 lbs which is 50% more than stock. This is great for holding power. The leverage ratio of the diaphragm spring has been changed so the pedal effort stays near OEM even with the greater clamping load. Usually, this results in a long pedal and slower clutch action and shifting but with the thinner uncushioned discs, the clutch action remains fast. The XClutch design is all starting to add up!
The pressure plate like the OEM part is a pull-type with an iron pressure ring. Pull-type pressure plates are more efficient than your typical push type as the clamping force doesn’t work to flex the pressure plate cover and reduce clamp load. Typically a pull-type pressure plate has 10-15% more actual clamping force for a given rate of diaphragm spring. This is great because many STI twin disc clutches require you to convert to a push-type hydraulic system.
The pressure ring has drive straps to assure quieter operation and a positive release. A lot of twin disc clutches allow the pressure ring to float where it tends to be noisy.
This ring on the diaphragm spring is so the throwout bearing can pull on it instead of push. Thanks to its efficient design, the XClutch has a torque capacity of 740 lb/ft up from the stock 350 lb/ft