Like the 1988 & 1989 CS before, they used a 944 Turbo parts, reference 951 331 611 02.

 

Only $400 each new from Porsche

 

Adaptec Speedware will make you any type of spacer you want for around $125 a pair.

 

Hub-centric is the most appropriate term for the application, as it includes the hub in the description. All spacers are concentric, in that the center hole is in the middle of the bolthole pattern; they may or may not have the correct relief for the hub, nor the ring to center the wheel.




I strongly suspect that the studs are pressed in rather than cast in to the bolt-on spacers. Most spacers I've seen are machined from billet rather than cast, except for some of the thinner plate-type spacers.


This pretty much ignores the OP's desire to be able to use both his street and his track wheels, with different widths offsets, on the same car. In his opening thread he shares that he doesn't want to end up with extra-long studs poking through open lug nuts while using the street wheels.

 

I saw that. Just wanted him to know that he may go to a track event where they will not allow the bolt on style spacer. Ask me how I know Honestly, I don't see them protesting for a track day or a HPDE. When they made me change them out is when I graduated to wheel-to-wheel racing, so he will probably be just fine.

 

You are right. Cut from billet, then the studs are pressed in. I sold all of mine and miss-remembered their construction. Had several sets to match up with different wheel and tire packages I had, worked just fine on the street and DE days.

 

Thanks everyone for helping me work though this. Every solutions is a compromise.... here's what worked and what I'm comfortable with at this point given I'll be on a track in 9 days and still have lots of prep to do.

Bolt on 20 MM spacers.

They're the thinnest hubcentric bolt on spacers I could find. They're also thick enough to hold the wheel studs and the conical seats and nuts appear to be very high quality. They took torque well. They push the wheels out as far as they can go for a track friendly disposition but I did have to roll the lip. I did a test drive pushing the car from side to side as aggressively as I could at 80 MPH and there was no rubbing. I thought 19mm was the max spacer I could do but 20mm worked.

Slightly off topic...I cant say enough about the Michenin Pilot Cup 2 tires. They generate nausia inducing grip that I still need to get used to. They're also quieter and ride better than the Continental DWS 06 All seasons I had on the 928 by a wide margin. I'm not sure what wheels these are but they are far bigger (19x11) and noticeably lighter than the (18x 9) inch Panamera wheels that came off. Kind'a interesting one can fit 19x11 wheels on a 40 year old OB design with just a lip roll.


Most interesting to me...
I had 15mm spacers on the rear first but they were not hubcentric. There was some offset related squirm and vaguery since the front offset is ET53. It seems to have disappeared with the 20MM spacers out back. I dont know how that's possible but the reduction in the little squirm I had and improved on center feel was clear to me. This evening's rather spirited test drive felt more like my previous Panamera wheel setup which has nearly the right offset.

 

what tires do you have on those 11" wheels ? they seem to be "stretched" … or is it the pic that gives that idea ?

I do have 15 mm ones among others , so they exist .

 

Michelin Pilot Sport Cup 2. 285/35/r19. 11 inch is the widest listed wheel size for this tire. The idea with the widest wheel possible for a given tire is that the sidewall is stretched and will have less of a tendency to roll over.... Thus providing a more precise feel.