At 1000 HP, you will need the 1800 lbs with the sintered Iron disc, or you will glaze the hell out of the surfaces on the street. I use the Ram Long PP and 11”

The GTX has about 680 HP, and that one I have 1200 lb, and does in fact slip some on take off on the street, and it is the McLeod Soflok which is 10.5”

Both PP are counterweighted, and for the track I adjust both down to about 200 - 250 lbs via the access hole on the bottom of the Bell.

Madscientist is right, if you try to launch on the track with 1200-1800 lbs, they will be parts breakers.

Tim Hyatt (RIP) told me that you need 1200-1800 lbs of base pressure for the street, otherwise you will glaze up the flywheel and PP surfaces. He told me that his son Chris runs the higher base pressure for the street, and it works great.

I am by no means an expert, and just followed Tim Hyatt’s advice since he was the premier expert with clutches for high HP cars. Oh, BTW, both of my cars are around 3500 lbs...so pretty heavy!

Mark