Since I know several people in the community have saved my previous data on oem spring rates on their computer, I wanted to post this info to let you know my data has changed a bit. The post below explains things.

The rates coming off BJ's spring tester differing from the rates I got, made me curious. I dusted off my boxed set of oem 2003 350Z springs and had another look. I hadn't written down all the previous measurements, so I measured them again, and again, and again,.........you get the idea. And this time I did not ask for someone else to do the rate math, found this neat web site that does it. http://www.racingpc.com/tips/coils-springs.htm



Front springs:
33/64" wire diameter (measured on all active coils)
spring Outside Diameter 4.5"
Number of active coils 5
Spring rate 314lbs




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Rear springs:
35/64" wire diameter (measured on all active coils)
spring Outside Diameter 5.0625"
Number of active coils 4
Spring rate 342lbs



So needless to see, I have new oem rates.
314/342