Re: Lesjöfors lowering kit by 35 mm not 40mm - Saab 900 Bulletin Board - Saabnet.com
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Re: Lesjöfors lowering kit by 35 mm not 40mm
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Posted by Landjet [Email] (#16) [Profile/Gallery] (more from Landjet) on Sat, 18 Nov 2017 16:55:54 Share Post by Email
In Reply to: Re: Lesjöfors lowering kit by 35 mm not 40mm, Frak [Profile/Gallery] , Sat, 18 Nov 2017 14:46:26
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What is missing from the "formula" is the spring rate. Normal springs are about 380 pounds per inch from what I've read. SPG springs are higher than that as the wire diameter is greater.

The only real way to find out the spring rate is to test the spring. You compress one inch, then measure the total resistance at the end of the next inch. It takes a special rig to do this, I made my own, but the pull ram only had 2 inches total piston pull, so I couldn't really get the right amount of travel for the second inch of travel. If you live an an area where there are Napcar shops, every gas station has one, yeah that's an exaggeration.

The point is that free standing and compressed depend on the spring rate, the amount of weight put on the corner. The AFCO springs I use have numbers etched into them, 400, 450, 500, etc up to 1000. I've used 400 up to 650, kinda like 600 as that matches the Koni damping rather well. I get some yaw with 400 pounders when a side gust load hits, but that is when we're passing through 120mph on the track. By then, the car is settled and pushed down, the aero loads the car rather well down onto the planet :-) When that side gust load hit, it was a rather instantaneous panic moment, then onward......

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