Ken D

Right, forgot to include the adaptor bolt set.

nickg

they look identical to my factory m030 968 stuff save they are red, mine are yellow. mine are 40k or so used and in great share. I priced the rears at around 800 a set new about 2 months ago. the paragon units are very nice too, but not factory parts if you ned that kind of thing

Oddjob

The Paragon koni shocks are double adjustable (jounce and rebound) and ride height adjustable for a coil springs - these are race shocks and are quite stiff compared to M030 suspension (they are current versions/copies of the shocks that came on the US M637 Escort Turbos and 944S2 Club Sports). Any 2.25" ID spring can be used on these shocks (Eibach, Hypercoil, etc), including the factory turbo cup rear springs.

The 968 M030 rear koni shocks are single adjustable, valved for street use. They are not ride height adjustable. They use a little barrel type helper spring which is only available through Porsche. I have heard people say there are different rates available, but only one part number seems to show up: 951 333 531 31 504. In any case, it is very limited as to available spring rates (1-2).

gregeast

I'm running 200# springs w/Konis in front and have single adjustable Koni shocks in back, with just the stock torsion bar.

Consensus seems to be that the spring rate on the helper is ~70#'s which, in combination with my stock non-M030 23.5mm torsion bars (137#'s), would put me right at 200#'s in the back, which would be perfect. Not entirely sure if you can just add the two springs rates together but it would certainly get me closer.

I'm hoping that the price of the helper spring and the perches is only a fraction of that $800 price for the whole piece since the shock is not involved. If I can weld the bottom perch onto my shocks then I think I'd be good to go.

Can't be that simple, can it?

gregeast

Here are the prices from Sunset:

951-333-531-31-504 Helper springs $107.51 per pair
944 333 526 01 Concave washer (perch) $25.93 each X 4

So, $210 for the whole set up...which is about what new torsion bars would be BUT I'm not looking a full day to install them either. I don't know that this would be all that helpful for someone running stiffer front springs than my 200's but it's an interesting possiblity to ponder.

nickg

you forgot the shocks themselves...they are different than std koni rears because they have lower perchs on them...i think they were like 250 each. you can't use the upper perch on the bottom, won't work btw

Manning

I was under the impression that the various cup cars, and actually most of the Porsche race cars from that era used Bilstein damper.

gregeast

Nick,

This whole exercise is aimed at using standard Koni rear shocks (which I already have) and adding/welding on the lower spring perch.

Can you give me any more detail as to why the upper perch won't work? All I have is the drawing in PET to go by. I realize that the lower perch would need to be permanently attached to the shock body, the question is whether that's possible?

Thanks for any insights.

Oddjob

Euro and Canadian Turbo Cups used Bilstein. For some reason (likely sponsorship/advertizing for the different race series), the US cars came with double adjustable Koni.

Manning

Ah, I see. Thanks.

nickg

the lower pearch is quite different than the upper. the upper is a slide on part that is captured by the top of the shock and only has a slot in it to a small diameter circle that the shaft passes thru and a larger one machined in the perch to sit up into the top shaft retainer. the lower perch is an itergrated part of the shock body, the other thing is that if you weld onto a gas shock, you risk damaging it from the heat. you won't be saving much if anything at all raelly if you weld on the ones that you have and mess them up. if you want a specific picture, i will take some tonight after class

gregeast

Thanks for the insight Nick, I figured this couldn't be that easy.

Guess I'm going to have to buck up and do the torsion bars, yipee..the price differential was coming all that great anyway but the difference in labor was going to be substantially better if I could have rigged up the helper spring.

Thanks again.