I was talking to our local builder and asking if he could add the brace from the door bar to the rocker panel. He stated he doesn't do them. I questioned why and he stated it's possible to get the car too stiff- I asked him to expand further on that.
He stated one time he bought one of his old cars back and after prepping it he could not get it to handle. After repeated attempts he realized the only difference was the additional cage bars giving additional stiffness. He said he cut the bars out and viola', instantly better. Sebring is our home track if that would make any difference.
My friends car has the 'angle bar' from passenger footwell to rear section and the dash bar (under dash connecting side to side). He recommended to cut those out. Has anyone else experienced this? (mine has neither so to me it's a moot point)
I can conceive of the added flex of the body being beneficial, but always assumed stiffer = better.
Secondly, another racer I know wanted to put poly bushings on his Miata and I recommended against it as old bushings are stiff anyway. I also recall reading somewhere (maybe here) that the rubber bushings give certain movement to the suspension for added stability (perhaps rear toe under cornering or braking, something like that). In other words, does the additional compliance of rubber bushing help in any way or would the stiffness of poly be best.
I would also imagine in a small hit to the wheel the rubber would give maybe saving a bent control arm, plus the additional compliance of rubber would save some fatigue cracking after a while.
Lastly, once tightened, the rubber bushings act as torsion springs, how would eliminating this affect handling. Thoughts?
Has anyone tested both and what was the result I want to be right but have no way to back my claim.
This is more of a mental exercise than anything and trying to satisfy both my curiosity and theories.