qcoffey

I did a search already and couldn't come up with the answer needed. I have a set of ERS springs for my Ground-Control coilovers and don't know the spring rate. I purchased the limited edition kit.

What I need to know is how to read the numbers. For example, the rear springs thatcame with the kit have the markings as follows: GC180.64.44

Does this mean that the spring rate is 180?

Any help would be greatly appreciated.
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CXHatchback

I thought they were usually in the form of 0800.250.0250 where the 1st set is the spring length (8"), the second is the spring inside diameter (2.5"), and the third is the spring rate (250lb/in) or something like that.

CXHatchback

on second thought, maybe the first number is 18cm long, the second is 64mm I.D., and the third is 4.4kg/mm rate?

qcoffey

Thanks for trying to help. I wish I know also. Anyone else?

Full-Race Henry

just email the company that the springs are made by.

jg

call GC they can tell you.

qcoffey

Thanks for the replies guys. I found the info I was looking for from a guy in the Road Race/Autocross Forum.

BTW, this is the link that he gave me. The info in here is awesome and will help anybody looking for suspension info. It will also help the debate on Skunk2 or Ground-Control which is better.

http://www.norcalcrx.org/tyson/coilover.html#05

CXHatchback

Good link, and it looks like I almost nailed it.