The prevelent thought on racing suspensions is to use the softest spring rate that prevents bottoming out. I think the 22mm type 1 torsion bars would put me on the bump stops at high speed. I think my 26mm 944 bars may be a little strong but with a lowered rear suspension I doubt it. If you bottom the suspension you will break loose in a corner, very suddenly.
There is a lot to learn about suspension setups, I'm just begining to learn. Another good book is "Chassis Engineering" by Herb Adams. My library keeps growing.
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