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Old 12-09-2007, 09:39 AM
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Rear coilover springrates-suggestions for my '36 Ford PU?

I'll be calling some manufactures tomorrow to see what they recommend, but thought I'd see what you folks might recommend.

The frame is boxed and I'm running the Heidts SR2 front end (forget which springs, but the ones Heidts thought would be a good start), the rear is just about done with a Tri-4 bar.

It will be running a 5.0/AOD, I don't anticipate hauling much more than luggage in the back, and 99% of driving will just be cruising/commutting/etc, it'll never be raced.

Anyone have any feedback for me?

Thanks.

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Old 12-10-2007, 05:13 AM
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Well, you don't really need more than 150 to 175 pounds per inch, but you'll probably need a rear anti-sway bar to avoid excessive understeer (push or plow) while cornering. What I'm shooting for is a wheel rate of about 150 pounds per inch (per wheel) and this will be affected by the placement of the springs (ahead of or behind the axle), but, if your IC is a reasonable distance ahead of the axle, this effect will be slight. (To determine the wheel rate, multiply the spring rate by the square of the ratio of A/B, where "A" is the horizontal distance from IC to spring centerline and "B" is the horizontal distance from IC to axle centerline.)

See my site for determination of IC location. Keep in mind that the spreadsheet "expects" a link length for a link which is parallel to the long axis of the car. In other words, your upper links are probably angled (as viewed from the top), so the spreadsheet length would be the actual length multiplied by the cosine of the angle.

http://home.earthlink.net/~whshope
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