Point taken, however please dial down the pontificating tone. You write as if you've never posted inaccuracies (and you know we all have). Additionally, you misunderstood what I wrote regarding holding capacity. To suggest the friction material of the clutch disc has no bearing on holding capacity is an inaccuracy IF that is what you're implying. Holding capacity is a function of both the clutch disc material and PP and now the flywheel material (which is new to me but makes sense now that I think about it).

A quick google search yields:

Will Baty/Centerforce: “There are basically three main types of friction materials used in clutches with many different grades in each type.”

“Kevlar typically has a lower coefficient of friction rating than most of the other types of friction material. Because of its lower friction, it needs a higher PSI load to work properly; it also works best against iron. Steel flywheels will reduce the holding capacity of this material. The nice thing about Kevlar is its wear characteristics.”

Which actually counters my claim about flywheels not having holding capacity. Apparently, indirectly, they do.

And I'm still not sold on your hand/wheel analogy. If both hand and wheel are moving at the same speed (double clutch shifting), does it still matter is the wheel is heavier. The delta in the momentum between hand and wheel becomes less important cause you're not trying to alter it as much as from say a dead stop. In that circumstance (accel from dead stop) and someone ringing out the gears using the synchros, your argument holds.

See? I managed an counter argument without pontificating

 

You both have a lot of knowledge on the matter lets stay on track

 

I've driven a car with a SOS clutch kit. When first installed there was a lot of chatter but it quiets down after a couple thousand miles.

I would have like to purchase just the SOS pressure plate and go with OEM friction disk but since SOS doesn't separate, I just went with a HD PP instead, no need to buy a kit when I'm just throwing out the disk anyways.

I don't have it yet but there are plenty of positive posts about ACT PP/OEM.

 

^Apologies. The poster referring to Billman's recommendation has it right. ACT PP, findanza FW, and oem disc. I'm using that combo at 18 lbs vortech sc'd with no slippage problems and it's easy on your left foot-outside needing a little more rpm-in daily traffic.

 

Which flywheel? Model number?

 

I forget the model number but they are going for around 300 and at that price point, I'd recommend a used oem AP1 FW which are going for about 50 in the classifieds. The ap1 is around 11 lbs and the fidanza around 8 IIRC.

 

I too wanted to buy just the PP from the SOS clutch kit, but as MANY have mentioned, they wouldn't separate them out from the kit.

ARE YOU LISTENING CHRIS @ SOS?!?!? Several people wish you would sell your PP on its own or option it with an OEM disc!!!

 

I couldnt be any happier with my ACT PP and OEM disk. No chatter. No power holding issues.

Stock pedal feel ive always felt was too soft. This is just right! imo

 

The Ap1 flywheel is 14lb, it works, but after running the findanza (8lb Aluminum with two piece replaceable friction ring) and the Act pro light (8.3lb one piece chromoly), id have to side with the Act Pro light, its just a more reliable flywheel, beautifully machined and wont warp on you like the Findanza did for me after I went to replace the friction ring. Mind you I ran the Findanza trouble free for 5 years, but once the ring wore out and I went to replace, it wouldn’t hold a clutch together, two times I had to drop the trans to deal with it vibrating loose and decided to chuck the flywheel and put in a ap1 I had laying around at the time, but the 14lb of the ap1 was a noticeable drag on the performance I was used to, so i was happy to find the Pro Light and get that swapped in.

And didn’t mean to come off so abrasive to you in post above, I am just a strait shooter and do have a rather extensive amount of experience when it comes to this car and modifications and mechanics in general, ive been at it with the same S for 10 years. I wont usually chime in unless I feel confident in the accuracy of what im saying, and of course there will always be something sometime that isnt right or overlooked, but there is enough clutter/confusion/wrong information going around for me to add to it, so I generally won’t post if I don’t know. Or I will say I don’t know. I hate to see other members go down a bad road if I can steer them away from it, or shed some light on my experience or educate them on the mechanics of a given topic so they can work through it on their own, that’s what I do here and enjoy it. I'm thrilled when I can learn something new from someone here as well, but honestly it doesn’t happen too often anymore.

 

Did you install the PP and flywheel at the same time of the supercharger or did you drive NA on that clutch setup for awhile beforehand?

I don't mean to hijack the thread, but I ask becuase I'm pushing 100K on my ap2 and the clutch is starting to slip. I've got a blower in my future but I'm probably about a year or so out. I didn't want to have to upgrade twice. I was planning on going w/ the ACT PP and AP1 flywheel but wasn't sure the daily driver status.