Rear Sway Bar

[cool4engineer]

I installed an adjustabled Tarret Rear Sway Bar on my 1983 930. The front sway bar is stock. I was told by my local mechanic that the rear sway bar wont make any improvement on my car (I only use it as street car) and that eventually, the mounts will be torn due to the excessive effort placed on them.

I switched to my previous set up (stock sway bar on the rear; stock sway bar on the front) but my car feels really loose on the rear end.

I modified the riding height on the car (25.5 in front; 26 in rear) and now the problem is even more noticed.

I would like to keep the riding height but, how can I correct the rear end loosenes feeling?
Should I switch back to the adjustable sway bar??

All torsion bars were replaced by new Elephant Racing bars....

Thanks
Julio

[Flieger]

What sizes of torsion bars do you have?

If the rear sway bar is set too stiff, it can rip out the stock mounts. This is a common problem, even on 911s. You can reinforce the mounts, however.

Adjustable bars are nice, I do not see why your mechanic did not like them. The Tarett bars are great pieces. I am looking to upgrade to them.

In general, a "loose" (oversteering) rear-end is due to the rear bar being too stiff relative to the front. If your stock setup still feels "loose", then you need to use a softer rear bar and/or a stiffer front bar. You could upgrade to a Tarett front bar to get a stiffer rate and the improved geometry (if the stock is under the A-arm style). The only other way would be to use an adjustable rear bar that has a nominal rate equal or softer than the stock bar, then adjust it as soft as it will go.

If you do not mean oversteer when you say "loose", then you need to give a better description.

The relative front and rear roll stiffnesses are what set the handling balance. There are many factors which contribute to the stiffness. Two of them are torsion bar size and anti-sway bar size. If your torsion bars are biased to the rear in stiffness, then you need an even stiffer front anti-sway bar.