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Old 11-18-2006, 07:48 PM
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coil over question?

How can I tell the spring rating? I would like to order some stiffer coil overs, but I'm not sure what my current ones are.

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Old 11-18-2006, 08:58 PM
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Most sprngs have a small metal tag attached to a coil near one end of the spring with the spring rate stamped onto it. You might try looking for such a tag at the top or bottom of the sping.

John
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Old 11-18-2006, 11:14 PM
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Spring Rate ID

You didn't mention the brand but if you happen to have Aldans the springs are identified by a painted color band on the end of the spring. Naturally that means you have to disassemble the coil from the shock to see it. I don't recall the colors but I'm fairly certain that a green band is a 180LB spring. There's black, red and some others. Check Aldan's website.
If they're not Aldans...sorry, can't help ya.
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Old 11-18-2006, 11:44 PM
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Springs are rated in lbs/inch..soooo if one puts a known weight on the spring to compress it one inch you now know the rate..They do make spring rate checkers as well if you like..

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Old 11-21-2006, 11:29 AM
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Use a spring rate calulator I've posted on here before.

You need the wire diameter, the number of active coils, and the overall diameter of the spring center to center.
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Old 11-22-2006, 12:28 PM
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To get the actual rate of a spring is easy if you have a hydraulic press and a bathroom scale.

Place scale on press. Place spring on scale. Zero scale. Compress the spring an inch and read the scale. This gives you the spring rate (lbs/ inch.)

Be careful centering and lining up the spring so it doesn't fly out!

Works good for most low rate ~<300 lb/inch springs
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Old 11-22-2006, 05:06 PM
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I searched for your calculator, johnsongrass1, but couldn't find it. Here's the relationship I use:

rate = Gd^4/[8n(D-d)^3]

where G = 1.16E7 , "n" is the number of active coils, "D" is the outside diameter, and "d" is the wire diameter.
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