Just removed my springs from the car and had them tested . Results are :
LF 200lbs RF 250lbs LR 300lbs RR 340 lbs

I have the 993.xxx.xxx variety that came on the car toward the end of production.
Porsche Tech said there are colour stripes on the spring to tell the rate but I could not find any.
The reason I removed the springs was because I kept getting more and more camber( couldn't get less than - 3.4 ) . Are these springs " bagged"?

 

Rear springs are progressive. They can't be measured by applying weight until they compress 1". They're 540lbs springs.

I would swap them L/R springs, you want the slightly stiffer ones in the driver's side.

You can also go aftermaket springs while keeping the stock shocks

Check the rubber bushings on the control arms.

are you running stock ride height?

 

When the guy set them up on the tester, he put mild pressure and set the gauge to zero. He made 11 full turns and read the dial. Don't know if this is an inch of travel but I left them off . Installed rebuilt Cup car Bilsteins and 1000lb front and 1200lb back Hypercoils along with the Tarrett toe links. Would have liked to have changed all the rubber bushings but will see how this goes. Ride height is 102mm fr and 115mm back, camber is -3.3 fr and 2.8 back running on Cups . I'll see how it feels on the track tomorrow.