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Old 01-12-2006, 07:24 PM
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need help with coil springs, how ..... do i know what i need?

i'm looking to buy a set of springs for the back of my car, but i don't understand what all the info is listed mean's. word's like rate, ect,ect. how the hell do i know what i need?


Last edited by Deuce; 01-13-2006 at 06:21 AM.
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Old 01-12-2006, 10:54 PM
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The spring rate is the amount of weight needed for 1" of deflection. So a 300 lb spring needs 300 lbs to compress it 1" a 200 lb spring needed 200 lbs to deflect 1" and so on. Front springs are usually in the 200lb to 400lb range, rears from 150 lb to 250 lb. some applications need more, or less.

You will also see springs listed as free height, and loaded height. free height is measured out of the car, with no weight on it, and loaded height is measured with the weight of the car on it. Some catalogs only list them by height, with no rates listed, but if you know the loaded weight of the spring, you can use that, and the difference between free height, and loaded height, to figure spring rate. For instance if the free height is 12", loaded height 8", and the load is 800 lbs, the spring rate is 200 lb And free height 10" loaded height 8" load 800 lbs, would be a 400 lb spring.

In both cases the ride height would be the same, but the spring rate would be different.. the 400 lb spring would ride much stiffer than the 200 lb spring.
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Old 01-12-2006, 11:21 PM
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I think this page sums it up well for G-bodies.
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Old 01-13-2006, 05:21 AM
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Sites like you mentioned, Triaged, are nice, but, at the same time, frustrating. Why don't they give you one more column with wheel rate so you can compare it with other cars and with the figures given in suspension books? All they had to do was multiply the spring rate by the square of the ratio of wheel load to spring load. Perhaps I'm too easily irritated. I'll go take my blood pressure medicine and go back to bed.
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