Okay time for one that I hope is not a mystery to someone out there.

I have been running my mini for over a year with good success but always had an issue where the rear end will start wiggling side to side once it reaches top speed on a straight. Typically it is just an annoyance but on occasion the wiggling results in a fairly strong turn to one direction or the other. It only happens once the car is at top speed, any acceleration keeps it under control.

I have adjusted the front toe both in and out to varying degrees and found zero, oddly, to work the best. The rear is stock toe. I have adjusted the camber from zero to -2.5 and seen no difference. I have tried various tires, treaded and non, front and rear and seen very slight changes in the behavior (brand new s-grips on the rear with slicks on the front seem to be the best). Track is a medium size parking lot with soda so traction tends to be very good.

I have not tried adding weight but have changed spring rates, oil weights and shock positions with no luck. I have also changed ride height front to rear and found lowering the rear slightly to bring it level with the front does help the rear but I lose so much steering it is not worth it.

Thanks for any thoughts and please let me know if there is any more info you would like.

Jason