Formula94lt1

Does anyone know of an ACCURATE list of the stock spring rates offered through out the years?

RyanPerrella

Try 928motorsports.com and look in suspension

Carl lists rates, not sure how accurate they are but thats the place that i would start.

IcemanG17

When I did the math the stock S4 front springs are around 250lb-in and the rears are around 175 lb-in

Mrmerlin

check the WSM in the suspension section

Formula94lt1

I have some crappy cd version of the WSM's. It is obviously lacking very much. Where is the best place to get the real thing these days?
I had no idea the WSM's were that extensive, I must be missing so much with this cd!!

Mrmerlin

Try Jim Morehouse , his CD is the best, plus it includes lots of other tidbits that are not in the WSM

Formula94lt1

Is he a board member or a vender? In the mean time I will google. Thanks!

Oh yeah and in the mean time if anyone has some spring rates I would like to hear em.

Okv

From PET I have calculated, for 1991 928 GT:

F: 257 ib (45N/mm), R: 186 ib (33N/mm).

I can not guarantee these numbers, I have just done som simple calculations based on information about spring dimensions and speccs presented in the PET.

Vilhuer

WSM has them all except Club Sport front springs IIRR. They are just written in different format than what seems to be usual. Also they are obviously spring rates, not wheel rates and 928 suspension has somewhat odd ratio. There is link Kim Crumb's document somewhere in archives which gives this ratio for '78-86.0 (-'85 ROW) suspension. Since '86.5 front end is different I don't know if old number can be directly used for it too or not. Though its probably close enough for most purposes.

ROG100

I stock the "Jim Morehouse" CD's

Tampa 928s

82
I have Weltmeister Sp-9200 in the front, company says 400-588 spring rate and lowers front one inch. Car seems a little rough over the bumps and have installed new Sacks in the rear. Can I use the stock Sacks with this or do I need to change the springs?

IcemanG17

My track shark (2700lbs) has koni shocks with 800lb-in front and 300lb-in rear....honestly it doesn't ride all that bad...yes its firm..but not harsh......

Ispeed

The S4 stuff is about 284 front and 185 rear. Pretty funny when a good set up is the 600/400 more than 100% stiffer... Also makes you think that any shock designed for stock springs will work like $hit with 600/400 or anything like that...