PF

I am looking for rear springs for my -89 Turbo Cup car so if anyone have any and might sell please contact me.

Kind regards
Peder

PF

I am still looking. Anyone know of any?

Please advise
Peder

ried

These are still available from dealers. Here's what you need:

Spring Part Number: 951-333-531-31-504

PF

Thanks but dont think they are the correct Turbo Cup springs. Should look like the attached pic and have part number: 951.333.531.32. To my knowledge they have not been available for a long time from Porsche.

Regards
Peder

beamishnz

You are correct Peder. The part number he was quoting was for the 968 M030 springs which are the same barrel style as on the '86 cup cars. You need the narrow progressive ones. Quite hard to find. I had 2 full sets last year, used one set and sold the other set. I'll check with the guy who has them and see if he is interested in parting with them. They are actually on a 86 cup car so he may want to move to the barrel set up at the rear. He's in europe so local to you

PF

Thanks Paul that would be much appreciated!

Do you know if all -86 Cups used that barrel type spring? My -86 has a spring like the later Cups and I have seen that on a few other -86:s aswell but maybe they have just been updated. My -86 has bilstein dampers front and rear as do my -89. I have read different series used different dampers like Konis.

Regards
Peder

beamishnz

Oddjob is the expert (and he may chime in ) but my understanding is that the '86 cars had the barrel springs for the rear with 'Weltmeister style' 250-300lb fronts and the '88 onwards had the parallel progressive springs and 160/400 progressive fronts that were of style that were Porsche MSport specific. The pic you have is of the later spec. Kristof who has an '86 car in Belgium has many refs showing the barrel springs from '86 although it is quite feasible that the '86 cars were updated with the later MSport springs as they came available in '88.

If you have and '86 with the later springs I'd put those on the '89 and get 968 rear barrel springs and Weltmeister fronts for the '86 car. Job done

I'll PM you with Kristof's contact details. It may be too much hassle for him to switch to barrel springs but you could have a chat to him.

Oddjob

Not the expert, but thanks.

My belief is that all the '86 cups came with the barrel rear springs, and I would guess that any '86 cars with the later springs were upgraded at some point after the fact, and were not originally supplied that way - but I don't have documentation to confirm that.

I did hear some years ago, from a single source, that the suspension varied somewhat for each venue - German, French, South African, Canadian, etc. But I have not found that to be true. From what I know, all the German '86 cups had bilstein and the US Escort/Clubsports had Koni - all springs and sway bars were the same between the 86 cars. And then all RoW 87+ Cups had bilstein with the upgraded suspension (springs, t-bars, swaybars), and the US Escort/Cups had koni. No other configurations or mixing of parts that I know of.

The '86 rear bilstein and koni shocks are different than the '87+ bilstein and koni, the barrel springs are shorter and the shocks used a fixed lower perch. The later shock bodies may not be threaded high enough to use the shorter springs. So the different year cup springs may not be interchangeable, w/o changing the shocks to the correct year also.

PF

Thanks Jim and Paul!

The amount of knowledge you have around these cars is impressive! One of the great enjoyments of owning a car like this is to search for info around this highly competitive but scarcely documented series

Ok so it seems my -86 has been updated to the later spec cup suspension and with the info you gave me Jim I can see that the barrel type spring will not fit the later bilstein damper because of its length or lack of theads that high up. Otherwise your suggestion Paul would have been spot on.

So I am still looking for the late progressive rear springs.

I have a lot of questions around other details maybe we should start a info thread around these cars.

beamishnz

Yep there is a lot to learn and I didn't realise the '86 cars had fixed length rear shocks ... so you never stop. And regardless of what Jim says, he is the expert ... just modest

Not sure if Jim is saying that the barrel springs will definitely not fit or may not fit. I'd get a measurement and check lengths of the 968 barrel springs.

P

beamishnz

Also check out Paul Allen's post https://rennlist.com/forums/924-931-...-cup-cars.html There is more info on Cup Cars there than you could shake a stick at

PF

I have been trough Pauls thread a few times. Alot to learn there!

Like you say maybe a measurement of the 968 M030 is the way to go to determine if they can be fitted to the late cup damper. Will try to get that.

Oddjob

I had some 968 M030 rear shocks for awhile, but didn't take measurements and I don't have any pics of them sitting side by side with either bilstein or koni 8242 rear coilovers. I think the konis have more thread adjustment than the bilsteins, but not positive about that.

If you have the later 87+ shocks on the car, then it may be best to look for the later springs. The later suspension setup (springs/shocks) is stiffer than the 86 stuff, so would be best to match the springs & shocks balance/performance-wise, even if the early barrel springs could be fit on the later shocks (??). What struts/springs are on the front of the car?

PF

My -89 Cup car has the stock Bilstein front and rear but with aftermarket springs. I have the stock front springs but missing the rears which I am searching for. But I also have a -86 Turbo Cup which also seems to have the later shocks and springs and Paul suggested to swap the rear springs off that car and put them on the -89 and then get 968 M030 for the rear on the -86. But as you say that will probably be wrong for the -86 since the car most certanly has been updated to the later shocks/springs at some point. They are bilsteins and look the same as on the -89.

So it seems that is not an option and as a result I am still looking for late style Turbo Cup springs for my -89.

beamishnz

If you have the later front and rears on the '86 car I would condider putting both orig late cup car springs on the '89 car and then put the 968 rears and Welt 250/350 progressive on the '86. Yes they are softer than the late springs but they are period correct for the '86 car. Still plents tiff enough for road/ocassional track use. Considerably stiffer than std 951S. So many options ... but that is a simple one that gives you both cars spec'd as they would originally have been.