I've got a buddy that races at the local dirt track, and in his class they have to run stock rear control arms, which G-bodys are the same as ours. The guy that builds a lot of cars around here will drill holes in the bushings on the left side control arm, one in front of the bolt and one in back, to help the bushing colapse some, and it shorts the wheelbase just a little to help it turn. My question is, if you did this on both sides of the car, would it help turning in both directions? If so, this would be a much cheaper alternative to control arms with spherical rod bearings on one end. Would polyurethane bushings be too stiff for this to work? Thanks, Ryan

 

It wouldn't help.

 

Are you trying to make a car turn on mud and dirt?

Drilling holes in both sides makes for a sloppy suspension. In general dirt track mods, should be left on the dirt track. You wouldn't run offset ballast, offset wheels, or any of that on the street, you don't want to drill your bushings either. Polyurethane is fine on the street. Drilling holes just defeats the purpose.

 

To answer your question-NO

What he is doing by making this change on only the left side of the car is changing the rear axle thrust angle to induce oversteer on throttle and understeer on braking. This keeps a car that turns ONLY LEFT on dirt more tight on corner entry and then pictches it with throttle and helps axle thrust or rear steer outward from the corner. Articulation alone of the chassis and traling arm angle will rotate this, but limitations on class rules will prevent alterations to height and mount points of LCA's so they 'help" roll induced oversteer by utlizing this little trick.
No you do not ewant anything of this sort on a street car especially on asphalt and one that turns right also.

Dean

 

Sound like majority rules, I will leave my bushings alone. I thought that might make the car a little to squirrely to drive, but thought I would check with some people smarter than me to see. Thanks everybody for your help, Ryan