Hello lads

I've been googling and searching and reading as much as possible about shocks and springs for my '78.

I've pretty much decided to go Bilstein for shocks. My question is about springs. I want to go OEM. First prize would have been to go 10% stiffer on the front a la the '88 clubsport. But alas these are NLA.

I'm struggling to get a definitive answer on whether the 928 GT springs were any different or stiffer to the earlier models?

Thanks in advance for your assistance.

Cheers.

 

I have just fitted GT springs from Suplex in Germany with Bilsteins. I am very happy with the setup on my GTS.

Springs are TUV and available from motor factors. Cheap too at $50 each.

 

This is great info. Thank you. Do you have part numbers?

 

GT springs were stock springs. Only CS & SE had the stiffer front springs.
We have sets of Bilstein's for $928.

Change of shocks and springs on your none adjustable fronts will raise the ride height significantly and look strange.

 

oh man. didn't think of that.

how do I solve that?

thanks for the warning!

 

http://www.ebay.co.uk/itm/1-x-Front-...sAAOSw8d9UxwDM

These ones.

 

Providing the Bilstein's have the lower spring perch and adjustable nut you should be able to use a later set of springs from a car with adjustable front suspension.

 

Thanks Gents

 

Here's a spring/shock combination that totally fell into my lap.

No exotic shock dyno or chassis dynamics testing (not decrying these, in fact I support these 101%), but since I don't have access to these goodies, I have to muddle along as best I can, using Seat of Pants performance assessment. :-(

So:

- Front end: stock springs, plus grey Boge shocks.
- Rear end: spring rate: 25% over stock rate. Shocks: Koni Red: adjust rebound by eigth turns until cornering grip/speed causes contractions in one's groin. (I have experienced this sensation and can assure readers of it's authenticity. :-)

Cheers.

UpFixen.

 

Rog, is it true then that Porsche only ever had one front spring rate, and that all rears were the same except on SE and CS models (ROW)? I think that says all US-spec cars had same spring rate from factory?

 

Tom - I do not know about specific spring rates however they used to be defined by a color code. I believe this was more to do with manufacturing as that they could not mass produce the same spring rate consistently. So they matched as close as possible and coded accordingly so there were matched pairs.
Porsche now has one part number for front and one for rear for all years apart from some early cars (say pre-83).
Certainly on all cars (86 ROW 86.5 USA to 95) they are now all the same part numbers either front or rear.
Only CS & SE had different front springs.
My $0.5 cents worth and I could be wrong 8>)

 

Sometimes I think that it would be better to call from a spring manufacturer with the specification we need other than looking for a usual provider that is really not anymore involve in the production of 928 specific spring
It should be a little more expensive, not sure, but with the true specification we need! What you have to know is the original spring rate
38 kg/cm front, 20Kg/cm rear but you can go further without any real issue until 100 Kg/cm front and 55 rear. What you have to be careful is then the lenght of the spring because with 100 compare to 38, then for the same car's weight the ride height will be upper the usual.

 

Thanks for all the feedback guys.

Since I'm going the 'preservation' route, I've decided to go the bone stock route...