Rear sway bar guidance

[aznbo187]

I'm still working on getting the 128 track ready, but next on the list is rear subframe bushings.

128 base didn't come with any rear bar at all and I haven't played with sway bars in general in dialing in the car so I'm pretty new here. I'd like to get a rear bar in there with the rear subframe install.

Is there a general starting point? I have yet to track the 1 so I'm not sure what the natural tendency is that the car wants to do. Should I start with a M3 bar and adjust from there, or go with something else?

Mainly will be doing road course, not much auto-x.

[tracer bullet]

I'll only suggest doing them in pairs / as a combo. Just one on its own may throw things off. The front is super easy to swap.

There are some pretty good threads of discussion here.

[wootloops]

It's largely going to depend on how stiff your springs are and what front bar you are running. Some track guys actually don't run a rear bar at all.

If you do add a bar I probably would start out with the m3 bars, and as tracer bullet said I would do it in pair with a front M3 bar (possibly a front E93 M3 bar since it's supposedly the stiffest of the stock bars). Then track the car a bit and see how it feels.

For comparison I am running stock base 128 front sway bar with 8k/16k F/R coilover spring rates and I think the car feels pretty good/neutral but I also am probably not driving the car at the limit enough. It seems like it might have just a tad of push mid corner but it's very little. A friend of mine has a e92 328 and he runs stock M3 sway bars front & rear but with M Performance suspension which is not very stiff (I think it's somewhat comparable to stock M3 spring rates)