[s-cars] spring constants

[Richard Tanimura]

First, I don't have an S4. My car is an S2 with a 3B motor and a B4 chassis.

I just bought a set of H&R springs for my car. I measured pretty carefully
and ran the numbers through a calculator for spring constants. Does anyone
have similar data for the stock or aftermarket S4 springs?

H&R, Front axel, S2:

Wire thickness: 0.54"
Winding outer diameter: 5.9"
No. of active coils: 6.5
Spring constant: 125 lb/inch

H&R, Rear axel, S2:

Wire thickness: 0.54"
Winding outer diameter: 5.9"
No. of active coils: 5.25
Spring constant: 155 lb/inch

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I also have some MTM spec:d Eibach springs. I think they are for the S4/A4.

MTM, Front axel, S4/A4?:

Wire thickness: 0.60"
Winding outer diameter: 5.47"
No. of active coils: 3.8
Spring constant: 419 lb/inch (Yowza!!)

MTM, Rear axel, S4/A4?:

Wire thickness: 0.31"
Winding outer diameter: 3.9"
No. of active coils: 8.7
Spring constant: 32.43 lb/inch (Very soft!!)

Something fishy here I think. Any ideas.

Richard
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