gary_phd

I just had my clutch replaced with an ACT PP, street disc (made by Exedy), and a Toda flywheel. I'm sc'd with just over 300whp. However, I still have the clutch delay valve. My car has been supercharged since 6000 miles, and I currently have 23000 miles (~17000 miles sc'd). I routinely drive my car hard, shifting at high rpms (i.e., redline), however, don't really do high rpm launches.

I'm debating whether to remove the cdv, since the clutch has a higher clamping force and would put more stress on the rear. But, since I don't really do hard launches, I'm not sure if that is something I should worry about.

The second issue is whether retaining the cdv will cause similar wear on my clutch? Will the ACT PP allow for less slippage, hence less wear? The clutch began slipping more and more at high rpm shifts, and that was the reason I changed it out.

Anyhow, any comments on the pattern of wear on the clutch disc would be greatly appreciated! Doesn't look like there is a lot of material left on the lining.

Race Miata

It looks to me there's quite some lining left on the disc. I'd say your slippage is a combination of high torque and CDV. Worn-out clutch disc is not likely the cause, at least not the main cause. A worn-out disc doesn't start to slip until the lining is about to flush with the rivots, assuming no excessive heatspots on the PP/FW. In fact, as the stock setup starts to wear out, you get to the higher thrust position of the diaphram spring on the PP (you get more clamping force when the "fingers" are curved outward a bit than lying flat and that's why milling off the friction surface of a FW is an old trick to give you more clamping force cheap).