Jim Florance

I am wrapping up a motor/trans upgrade (2.9liter/906cams/PMO Carbs w/close ration 915 gearbox) Originally, I was planning to use a Turbo clutch/flywheel but my mechanic came across a NOS RSR clutch/flywheel and is pushing me to go this route, the advantage I'm told is a big weight savings. does any one have any opinions on taking this route? is the peddle pressure different? Is there any wear or reliability issues? The car is being built for both street and track, emphasis on track.

Steve Weiner-Rennsport Systems

Hi Jim:

In three words,.......Just Do it,......

Its a great upgrade. Expect higher pedal pressures. No downsides.

Tim

What Steve said

ive heard that NOS RSR clutch is NLA

Jim Florance

Steve: your opinion has always served me well and is good enough for me. I did go ahead and got the clutch and Flywheel. My Mechanic, Don Kravig, Precision Motors, Riverside CA said he ordered it directly from Porsche, He said he was suprised they still had any in stock as he thought they were NLA as well. Guess I lucked out. it was about $100.00 less than the Turbo clutch I was planning to use. Once I get the car back on the road I'll let you know how everything works. Ps: I still am planning to get the suspension components we discussed, I ran into a nasty rust issue that drained any discressionary cash for the project and have to get that behind me first.

Cupcar

Some years ago I used the 3 liter RSR pressure plate that has an aluminum pressure plate coated with a steel surface. I used it with a stock flywheel and the RSR ring gear which is a nice piece also. The ring gear is cut away betweeen the mounting screws, dropping mass at a critical point. I used the Sachs torsion sprung disc with the marcel spring in the plate since I used the car for street as well as aurocross/time trial use.

The only downside I found was that the surface of the pressure plate developed fine surface cracks after only a couple thousand miles service. The clutch worked fine, I discovered the cracks during an inspection with engine out for other reasons. I replaced the pressure plate as I did not know what the cracks meant. Maybe it's normal and the plate would have lasted much longer in service, maybe someone else has seen this. <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />

Jim Florance

Hello Cupcar: Thanks for the input on the pressure plate. I have not heard of this, I'll bring it up w/ my tech. He has many years of expreience w/ the set up you described (the same as is proposed for my car). If he has seen the surface cracks you mentioned, I'll let you know.
Thanks, Jim