Z4 3.0SI Coupe Lowered - Rubbing Issues

I am running VMR V710's 19x8.5 ET35 Front and 19x9.5 ET45 fitted with Falken 452's 235/35/19 Front, 265/30/19 Rear, I have experienced no rubbing issues :D apart from a kerb :headbang:

So I would have to agree it looks like the the offset is every so slightly wrong.
 
I've Eibachs on my M coupe. I fitted CSLs today - 19x8.5 with 235/35/19 front and 19x9.5 with 265/30/19 rear. The offsets are et 38 front and et 27 rear.
After a spirited drive, I can say there's definitely no rubbing :D
 
RichardG said:
I am running VMR V710's 19x8.5 ET35 Front and 19x9.5 ET45 fitted with Falken 452's 235/35/19 Front, 265/30/19 Rear, I have experienced no rubbing issues :D apart from a kerb :headbang:

So I would have to agree it looks like the the offset is every so slightly wrong.
Click to expand...

This is what doesn't make sense. Your ET35 wheels with all the same other dimensions and tyres would be sticking out further than my ET40 Wheels so they should be worse.
I do regularly use some very bumpy roads so that would probably not help.

BMWZ4MC said:
I've Eibachs on my M coupe. I fitted CSLs today - 19x8.5 with 235/35/19 front and 19x9.5 with 265/30/19 rear. The offsets are et 38 front and et 27 rear.
After a spirited drive, I can say there's definitely no rubbing :D
Click to expand...

It is really strange that no-one else is getting a problem because that wheel arch liner, where it attaches the bumper to the front wing on the outside edge is literally only an inch away from the tyre. Some people say they get rubbing on bumpy roads even with the stock suspension and tyres, so i wonder if it has more to do with road conditions than anything else.

I have put the original 18" wheels which came with the car on the front and no rubbing, but they look silly to my eye with the huge wheel wells. I am going to try and put the original springs back on the front and see what it looks like, but if i don't like the look, will probably sell and buy something else. I can't live with a jacked up car. I would have thought this would have been a more common problem than this looking at the design. I can imagine that someone with coil-overs wouldn't get the problem, becuase they can be set low and adjusted to be pretty stiff.
Its funny that with the H&R springs on there the problem wasn't as bad because they are much stiffer and the eibach (which arn't as low) are actually worse because they are so soft.
 
pixelloft said:
It is really strange that no-one else is getting a problem because that wheel arch liner, where it attaches the bumper to the front wing on the outside edge is literally only an inch away from the tyre. Some people say they get rubbing on bumpy roads even with the stock suspension and tyres, so i wonder if it has more to do with road conditions than anything else.
Click to expand...
No-one else has your combination though, of 3.0 suspension and M bumper, they are 3.0 suspension/3.0 bumper/liner or M ditto. Sounds like the wheel arch liner isn't helping, wonder how different it is to the ///M one? Have you tried refitting the original bumper/liners to see if it makes any difference?
 
I agree - with the offsets on RichardG's car and on mine, you would be more likely to find rubbing issues than with yours. Especially as my engine is heavier than your aluminium engine.
I wonder if the problem relates to the way in which the M bumper is fixed on a non-M car? Or perhaps your reps are particularly heavy, which would increase the suspension travel of the wheel over bumps - as Beedub says, his friend with a significantly lowered car has no rubbing problems from their OEM CSLs.
I must say, your car looks great with the CSLs, it's a real shame you're struggling with rubbing.

Edit - I see great minds think alike Wondermike!
 
Thanks for all the help guys. The M bumper is fitted with the M liner and is identical to the M car so there is no difference there.

I think i found the problem though. I just removed one of the dampers to put the old springs on and noticed leaking. I tried to compress the damper and managed to do it all the way with ease... very little resistance, using the palm of my hand against the shaft. Usually you would have to push a damper against a wall wouldn't you. At least that is the way it was with all my previous cars.

If the dampers are totally shot then i suppose it makes sense that it is bouncing way too low on the springs as there is no additional resistance from the dampers.

Would be great to get thoughts from anyone else who has taken a good set of these dampers off and checked resistance. I know they are shot becuase they are leaking but would be good to know what resistance i should be getting. Maybe i should get some Bilstein B6 dampers.
 
BMWZ4MC said:
Edit - I see great minds think alike Wondermike!
Click to expand...
Indeed :D

pixelloft said:
Thanks for all the help guys. The M bumper is fitted with the M liner and is identical to the M car so there is no difference there.
Click to expand...
Yeah but the 3.0 suspension is different to the ///M so the location of the wheel on your car relative to the position of the liner may be slightly different. Nobody else has a lowered 3.0 with an ///M bumper on.
 
pixelloft said:
glastoveteran said:
original guvnor said:
Can't help with the problem but it's a lovely looking coupe ! :thumbsup:
Click to expand...

Yes it is - what colour is that? Space Grey?
Click to expand...
Click to expand...

Not sure. Its a grey Pearl I will have to look at the log book.


Looks the same as mine which is stratus grey, colour code 440 if i remember rightly.

Love the wheels and M bumper conversion :thumbsup:
 
on the velocity vb3 alloys the offset for an ///m is et40 front and et 22 on the rear without a spacer,et30 rear if a spacer is used.that info as i said is for an ///m so mstyle may have given you the setup for an z4m :thumbsup:
you can always e-mail charles at velocity in the states and he'll give you the correct offsets and tyre size for your car.
 
I just bought the bilstein B8's. Fitted them on the weekend. No rubbing at all. The factory dampers were totally shot. It handles really well now. Still feels like i need to get the geo done because it feels a bit understeery.

Does anyone have any good geo specs for the car or are the factory specs the best. Its just for fast road use.
 
first of all, what an amazing looking coupe! love it. as for your issues i cant really help however on my roadster i have the following:-

F: 8.5" wide rim 235/35/19
R: 9.5" wide rim 265/30/19

i also have the eibach sports springs with no rubbing issues to report. As said above by various people i can only assume its the offset.
 
You have the same issue i am having now. I have ET38 with 235/35R19 tyres and Eibach springs fitted, and rubbing in excatly the same place.

Suspension wise the std shocks go back into the shock rather than being pushed out like the rear shocks. All the BMW's ive done suspension on have been the same, so never thought anything of it. Plus mine are like new, no leaks etc and you cant pull them back out by hand.

But maybe now you have coilovers they are just so stiff they dont have the same travel as before. But as some people are running ET40 with 235's and have no issues im wondering why i am. I know 225's are a better choice and an 8J rim, but dont really want to.

:( what to do. And no its nothing to do with my bumper :rofl:
 
You must log in or register to reply here.
Back
Top Bottom