I have the original upper control arm bushes developed by one of the guys on the old XJR6 forum made a slight improvement to the tram-lining

Then went to 235/50/17 tyres problem solved

I also have Andy,s rose jointed sway bar links they make the front really tuck in nice in corners

The 235/50/17s also make the rear come out if you switch the traction control off easy power on over-steer

I searched for matching 255/45/17s so I could have the larger tyres on the rear but no manufacturers make them with matching tread patterns so its one or the other
car also drives nicer on crappy roads not so rough an acceptable compromise

 

continue on

or turn left for an allied topic:

https://www.jaguarforums.com/forum/x...41/#post904674

 

I did exactly the same to my x300 xjr used to be all over the road was like being in a speedboat, put the narrower tyres on and it cured the tramlining completely, certainly a lot cheaper than replacing all the bushes if you get some part worns on ebay, paid 40 a corner for some merc tyres and would highly recommend it

 

for what it's worth ...

apparently the bmw z3 is notorious for tramlining in stock form whereas the m3 is not.

this is true even though the z3 running gear is based on m3 running gear.

the difference is the rear front control arm bushing on the z3 has voids in the rubber whereas the m3 does not

the complete cure for tramlining in a z3 has two parts:

1. replace steering rack bushings with poly bushings

2. fill voids in control arm bushings with plastic "fillers" which are available for that vehicle from the aftermarket