Driving Issues After Pothole

A

aerojamesz4

Member
Hey everyone,

I hit a pothole about 6 months ago and after several repairs my car is still not driving correctly.

At first, a couple of my rims got bent from the impact and the run-flats destroyed so they were all fixed when it first happened. After this, my car still tramlined very badly so I got all my run-flats replaced with Pirelli tyres and the issue still existed. I ended up having my car examined at a workshop and the control arm bushes were replaced, fixing the issue a bit. As the problem still existed I purchased a set of Continental tyres and things are pretty much still the same - when there are bumps and discrepancies in the road my car still follows them.

Does anyone know what is still wrong with my car? Would I need to replace the suspension on my car? I've had everything inspected and there are no broken springs and the shocks etc were all deemed to be ok, so I'm really confused as to why my car isn't driving correctly. Is this just a characteristic of the stiff chassis on the z4 and I perhaps just never noticed it before? Or is my steering damaged? (I'd like to note that my car has never had those electronic steering problems in the heat).

Thanks
James
 
My Z4 2.5 sport tramlined all the time from new on run flats. Replacing with non r-fs should have made things much better. Does your car drive ok when on motorways etc not pulling to the left or right or vibrating?
 
Almost certain it is your run flats.

I have just put my run flats back on for the winter and I immediately noticed the handling change. It is sometimes a fight to keep the car going in a straight line.

If you've had everything checked, I wouldn't worry and I'd get a good set of non-run flat tyres.

Should do the trick. :thumbsup:
 
mine on non run flats still tramlines more then say a focus; i put it down to the wider tyres.

If the car alignment is ok; and driving at speed on the motorway doesnt cause any issues then i would says thats how the car is!

You'll just have to find better roads to drive on :lol:
 
Thanks for the replies guys but forgot to mention both the Pirelli and Continental tyres were non-run flats and there are no weird vibrations at highway speeds. Forgot to also mention that the car's had two wheel alignments since the incident.
 
Mine has always tramlined to a certain degree. Changed to non-RFTs which helped a bit.

i think you're right in saying the bigger low-profile tyres don't help. And i reckon light alloy wheels, especially the 108s don't help either.

my parents SLK is very similar - that also has 18" AMG wheels on a low profile.

i've just put it down to stiff roadster setups and shitty roads.
 
My humble opinion is that to have done such damage to two wheels and tyres, (i) that was some f*ckoff pothole, and (ii) you must have hit it at a rate of knots.

Given you have tried two sets of non-RFTs I'd be looking for some alignment or suspension damage personally - worst case scenario you could even have bent the chassis (or monocoque for the anally challenged :roll: ) out of line. But with a serious specialist or BMW dealer (and yes, not necessarily the same thing LOL!).
 
lacroupade said:
My humble opinion is that to have done such damage to two wheels and tyres, (i) that was some f*ckoff pothole, and (ii) you must have hit it at a rate of knots.

Given you have tried two sets of non-RFTs I'd be looking for some alignment or suspension damage personally - worst case scenario you could even have bent the chassis (or monocoque for the anally challenged :roll: ) out of line. But with a serious specialist or BMW dealer (and yes, not necessarily the same thing LOL!).
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