I know of all the concerns about high rpm shifts with the ACT clutch. My question is strictly directed to Dirk at ACT: Is the cause for this concern directly connected to the clutch disc? I have installed numerous ACT clutches with great success and I will also be installing one in my MR without question. Yet I want to use a slightly different combination. I like the driveability of the stock clutch and the decreased noises with the stock MR disc, therefore I want to use an ACT pressure plate with a stock OEM MR disc. If I have zero issues with shifting at 8300rpm's with the factory clutch, I suppose that only swaping the PP to a heavier clamp model will work well. I don't use this to launch much, just concerned with clamp force since I have roughly 500whp. I know its just a matter of time before the stock clutch gives out , so I want to plan ahead. So do you think that my combo will work out well? Like I stated, I dont need a drag clutch with higher heat capacity. Thanks ahead of time

 

Bump

 

Stock clutch is still holding? Wow! You made like 494whp almost a year ago. That's impressive.

 

Still holding, although I make it a point not to launch, only 2-3 times launched. Clutch feels perfect with zero slippage and 25psi daily driving.

 

I am suprised you didn't just call or email me. Anyway, I would be glad to answer your questions. If you have followed the whole "lockout" conversation, you realize whether it's our parts, stock parts, or someone else's, that adjustment usually takes care of it. In some circumstances, people have other issues like failed syncros, etc. in which case adjustment won't change anything.

Adjustment affects how much air gap you have around the disc when the clutch is disengaged. Because our pressure plate places more load on the system, it requires more travel than the stock pressure plate. We intentionally lessen the cushioning in our disc so that it takes less travel to operate than the stock disc. This makes a great combination which overall takes less travel to release than stock.

By using the stock disc which has more cushioning between the linings, the parts will require more travel which means less air gap than using our disc. If your car requires adjusment using our disc to prevent lockout, it will require even more adjustment using the stock disc. I don't like the idea of using the stock WAD (wide angle damper) disc design for performance applications either. I am not convinced it is up to the task. I am also concerned with the stock friction material and if it will last for you. The premature wear that is so common on these cars can be blamed on friction material (combined of course with poor driving habits). For those reasons I wouldn't recommend using the stock MR disc.