front or both sway bars

[John_01]

Originally Posted by 128Convertibleguy

On a well designed race car, with good "camber compensation" a bigger front bar will definitely increase understeer. On a 1-series - not so much. Maybe it will increase understeer if you start out with a lot of negative camber and very stiff front springs (which also decrease roll). With stock springs and stock camber, I doubt it very much.

Your points are well taken, but the OP is NOT in the category of stock springs and stock camber. I don't know about the tire sizes, but it sounds like a proper track setup already. At this point I'm just interested to hear how it goes.

[128Convertibleguy]

Originally Posted by clutch128

Good info. Thanks.

I've decided to try out the M3 bar on just the front first. I have a track day in Feb. I'll report back.

Originally Posted by John_01

Your points are well taken, but the OP is NOT in the category of stock springs and stock camber. I don't know about the tire sizes, but it sounds like a proper track setup already. At this point I'm just interested to hear how it goes.

I'll also be very interested. As John_01 pointed out (and I simply overlooked) clutch128 has the strong front springs and large static negative camber I said could make things go the other way.

[TC Kline Racing]

Originally Posted by clutch128

thanks. this is what HPA also suggested. I will trust the pros.

Just for posterity, can you talk to what else you had done to the suspension under these tests. Did you ever try removing the bar entirely?

This was with our Double Adjustable Coilover Suspension on the car. We did test with no bar, and the difference was negligible, but definitely slower with a bigger bar. No rear bar or stock rear bar would be a personal preference.