Coil-over spring rate color codes

[my427cobra]

Hi all. Hope everyone is well out there.

I know the subject of coil spring rate color codes have been discussed before but I can't seem to find it.

I have two coil-over springs (sitting on my shelf for the past 10 years) for which I am trying to confirm the spring rates.

They are black powder coated springs, 3.4" OD by 2.6" ID by 8" long. There are two color slashes on the end of the springs: silver and red.

I don't recall the manufacturer but my hand written numbers on the end of the spring say 450 lb.

Is there a site/reference I can go to to confirm the color code/spring rate.

Cheers
Greg

[DesertMK4]

Springs are normally labeled with their spring rate (i.e. the amount of weight to compress the spring 1 inch). On an assembly line colors are used. A given model of car get blue springs, the big engine car gets red springs to off set the increased weight of the big block. Without knowing the maker of the springs I don't think there will be any universal color code. A Ford red spring does not equal a BMW red spring. One more small point: there are not enough primary colors to code springs. My Eibach springs came in rates from 250 to 650 in/lbs. The part number on each spring ended with the spring rate as the last three numbers. The springs came in only three powder coated colors: red, yellow and black. By the way I reduced the spring rate front and back by 100 lbs.from the FFR rates and have loved it ever since. Hope this helps.

[RUFdriver]

The color codes are going to be manufacturer specific, Porsche has a Bizantine array of colored stripes on their springs, use the numbers.

[my427cobra]

My recollection was that aftermarket US coil spring manufacturers (Alden, TCI, Afco etc) used to put a color code on the top (flat ground) part of the spring to designate spring rate.

I know auto manufacturers do put their OEM unique color codes usually on the side of the coil spring about half way down.

I'll really have to dig through old file boxes to find the info now.

Or when things get back to normal go over to a local dirt bike shop. They have a spring tester/lbs per inch measurement set-up.

Cheers
Greg