Thanks to Murry for finding this.

  It looks like we can just use the Ford splined part to mount the SGF
  damper and an .090" thick 4130 plate to hold the ring gear. This is
  easy to make with nothing more than a lathe and easy try.

  Paul Lamar


  Looks like the driveshaft coupling I mentioned once. How well will it
  dissipate the heat?

  Dale Davies

  Good question. On second thought we are in this for the long haul.
  It might be a mistake to depend on just one part like the SGF that might
  disappear.

  Probably better to build our own. Another advantage to that is we
  can tailor the durometer of the rubber bushings to our needs.

  Paul Lamar

  Hi, they are used in high volume production cars: Mercedes, Corvettes,
  BMWs, etc. also sold for marine use.


  Murry I Rozansky

  There are many sizes. I don't think they all use the 300 ft pound version.

  Paul Lamar


For everybody that would like to try an off the shelf rubber damper
here is a reliable source. Been around for years and will be around
for the foreseeable future as this part is widely used on certain classes of road racing cars. The torque rating is 220 foot pounds about right for a turbo
or P-port. The mounting bolts are 7/16th and the bolt circle is 3.78 inches.
The thickness is about 2 inches so it should fit in the cone of the stock
flex plate both 13B and RX8. You will need to machine your own adapter.

The company is called Pegasus Auto Racing Supplies. Been in biz 31 years.
1 800 688 6946

www.pegasusautoracing.com

I want to warn you that this damper is likely to be limited to 5000 RPM by
the manufacturer so if you push it beyond that you may explode it.

Hopefully Murry can come up with a source for the SGF which is rated for
higher RPM.

Paul Lamar