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fredmeister fredmeister is offline
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Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,235
Originally Posted by speednme1 View Post
Trying to figure out what springs and spring rates are on my car(930). Installed by previous owner. They have the green housing(Bilsteins?)..any help would be greatly appreciated.
You can calculate the rate yourself with the following formula:

Rate = (Emodulus for steel x wire dia^^4)/(8 x no. of active coils x (OD of spring-wire dia)^^3)

It takes some measuring and some judgement to determine the no. of active coils but this should get you what you need.

1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
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Old 05-19-2013, 01:54 AM
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