TORSION BAR ADJUSTMENT
Say what you will. If you crank the bars up it will reduce the travel and produces a harsh ride. Don't ask me how I know.
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It reduces suspension extension, of course. Just like lowering the car will put you on the lower bump stops with suspension compression, raising the car excessively will put it on the upper bump stops with extension. So you lose travel in extension.
But there’s no big change in wheel rate. The spring rate of the torsion bar doesn’t change AT ALL, and the effective wheel rate only changes very slightly.
But it does that as the control arms move up and down all the time no matter what you do, that’s just because of the effective length of the “lever” working on the torsion bar. The “lever” is always the horizontal distance from the torsion bar hex to the lower ball joint, so since the ball joint moves in an arc it isn’t constant. It’s a small effect, and regardless of the ride height the effective wheel rate is always changing slightly with the angle of the control arms as the suspension travels up and down.
If it rode harsh, you were either bottoming the suspension out on extension, or getting crappy ride effects from the lousy alignment specs.
