is it ok to adjust torsion bars to change my cars stance.

yellowdartdave said

OK...put it up to factory ride height and go for a ride.
Then crank them all the way up and go for a ride.
Then tell me the ride is the same.

Or set it to correct ride height and jump on the bumper
Then crank it up all the way and jump on it again.
Bet you don't move it.
The farther you pre-load the bars, the harder it rides.... you have changed the spring rates.. just like air shocks or air bags.

Click to expand...

After sleeping on this I have to admit that yellowdartdave has a point here. Experience may trump basic theory sometimes. Even though the "rotational" spring rate has not changed the practical one may have. Here's my thinking on this: (An extreme example just to make the math easy)

If you start out with the lower control arm horizontal to the ground, and it was 12 inches long, and you put 1000 pounds on it, then it would transfers 1000 FtLbs to the torsion bar. Then you crank it up so the LCA is now 30 degrees to the ground. Even though you still have the same 1000 pounds on it, the torsion bar would only see 866 FtLbs because the force is only vertical, not tangential like when using a wrench.
As far as the driver is concerned, the perceived spring rate has increased 16%.

OK, so the LCA does't move that much, but even a 10% increase is very noticable. What do you think?