Charlie944

I know it is expensive, it was my last resort but after doing 3 clutch jobs in one year in my garage I was done messing around and bit the bullet.

Your 341ft/lbs at the wheels is going to be more at the flywheel. I know the KEP stafe 1 w/ a stock disc will hold 500ft/lbs.

I would think you could use a stock PP with those numbers but you will need a more aggressive disc (higher coefficient of friction). The CUP disc is still organic just with less springs (no difference in friction). You have a few options for disc choices: Ceramic/bronze which is not very forgiving on the street which seems to be where you drive it most.
The second being Feramic. It is much more forgiving on the street yet has a higher coefficient of friction than the ceramic/bronze/copper setup. You can also get the feramic in a full-face instead of a puck design which will help with streetability.

I bought mine from South Bend Clutch Co out of Indiana.
http://www.dxdracingclutches.com/main_home.html

Andy@dxdracingclutches.com was very helpful to deal with. If you send them your current 951 disc they can rivet on the new material for ~$175 which is far cheaper than getting their disc and that way you know the hub will clear the flywheel bolts!

Really it boils down to a trade; the KEP and stock disc will offer stock like engagement and hold your torque and then some but at a steep price, or just get a more aggressive disc and trade some driveability and save some dough.

Hope this helps

gt37vgt

the thing that really pisses me off is i know damn well there is about 14 lining options but every clutch guy tells you of the 3 he likes or who pay kick backs .

333pg333

The one Charlie mentions does sound like the best short of a puk clutch setup. I believe that there are a few guys running with these to their satisfaction.

Charlie944

Some more info on the Feramic marterial:
It has the highest heat resistance of any other clutch material made today plus has a friction coefficient of 0.7. This coefficient also doesn't change with temperature as many clutches do until after 900 degrees. It has a melting point of 1600 degrees.

tconn

How much is a feramic disc?

Raceboy

Were there any downsides like slower shifting due to syncros have to do more work as Feramic is very heavy compared to other materials?

Charlie944

I have a lightened steel flywheel + the KEP pressure plate is Aluminum so any extra weight of the feramic material (yes it's hefty) is saved by the weight savings between the flyhweel and pressure plate. I never noticed any synchro grinding or needing to shift slower. I have a Schnell Short Shift Kit which is alright. I actually prefer the stock throw with good bushings so I think I will go back to stock.

South Bend Clutch took my existing CUP disc and riveted on the Feramic material (both sides) for ~$175. To get their disc and hub (which I found did not clear the flywheel bolts...not enough offset spacing) was $375.

You can go with a hybrid disc where the flywheel side is something other than Feramic for a less wear but then torque holding capacity goes down because now the less aggressive material on the flywheel would be the weakest link. That is why I chose to go with Feramic on both sides.

blown 944

are you using the 951 PP & FW?

Thanks for the info BTW. I am about sick of the 4 puck, and not being as aggressive with this car now, so this may work very well.

Charlie944

Hi, I am assuming this question was for me. If so, then yes I am running the 240mm (951) sized clutch disc, flywheel, and pressure plate.

Originally, the Callaway 944 still had the rubber hub 225mm NA clutch setup, and I tried to make that size work by going with the Blaszak setup (Kevlar disc and modded Sachs PP) but it failed to hold the torque and would slip once heated up. I then kept the same PP and went with a 225mm Feramic disc but by then I was having problems with slipping again due to a warped Fidanza flywheel and the clutch would slip once again when hot.

It was after all this messing around that I decided to upgrade to the proper 240mm size 951 clutch and go with the KEP PP and stay with the Feramic material.

blown 944

got any pics of the 83??

I am very interested in the details on it especially how it looks with those wheels and the early look

blown 944

got any pics of the 83??

I am very interested in the details on it especially how it looks with those wheels and the early look

dand86951

I went with the hybrid for a smoother engagement on the street. According to South Bend the KEP I and the hybrid disc should easily hold approx 600ft lb. I have not noticed any sluggishness in shifting and after 20,000 miles no apparent problems with the transmission or the PP and disc. I have the stock flywheel.

INURGRL951

Well I had MANY issues with clutches on my modded 930 ....so when modding the 951 I went with what worked in the 930 Spec stage 3+ lightweight pressure plate clutch disk and scalloped Spec flywheel. I would not have the problem of the two different metals heat ranges on the lightweight flywheel knowing metal like I do I know that probably a bad idea for the purpose of my car


costas

tconn

At $175 to have a disc made, Feramic seems like the way to go. My setup doesn't slip but it isn't easy to drive on the street, I'll be trying the Feramic disc.

Dare

I like the idea of the resurfacing a Cup disk using the Feramic material, but I wonder how long the center section is designed to last (assuming one starts with a worn-out disk). Can it be reused repeatedly? I assume eventually the springs wear out.

Also, does anyone know where it find a used Cup disk?