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  #26  
Old 04-28-2019, 04:28 PM
Jager66 Jager66 is offline
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Mein Auto: Z4 3.0 Si
OK-
The back ground to my request is that I took my Z4 3.0 Si on factory spec 18" off-set wheels and non-RFT, to have its wheel alignment checked, It was too +ve at the rear and likewise at the front. The rear camber could not be adjusted further than its circa 2 deg 15 min. We didn't try adjusting the front. These checks were done unladen. So I wondered whether this was the reason for the lack of further adjustment.
Doing a bit of research and measuring the ride height, my rear measures 610mm and front 598mm (lower edge of rim to wheel arch) which looks as if the rear is riding high for the MTech sports suspension.

Looking through some of the papers that came with the car and its MOT history, it failed the MOT with a broken rear spring in 2012. The test was done at a BMW delership and may have carried out the repair.

Also in the papers is an alignment print from 2015, showing a 'standard' suspension set up. Initial readings show the rear track and camber as being out of range and then adjusted to standard suspension settings not the MTech.

So, from the ride height, it looks as if the rear is non-sports height, with the front sports suspension height and that the car has been set up with non-sports suspension alignment.

I am presuming that the non-sports springs are longer, which is why the ride height is high and that the combination of this and not using weights is why the rear camber can not be adjusted any further?

The car seems to handle and ride well on its new tyres and I was only checking the alignment due to inner rear tyre wear on the old tyres.

As I see it, I have a number of options, do I stick with the 'pimp my ride' rear high- ever so slightly set up or get the springs changed and set it up as it should be?
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  #27  
Old 04-29-2019, 05:48 PM
Andyz4 Andyz4 is offline
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Mein Auto: 2006 Z4 3.0si
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Originally Posted by janole View Post
and you are running those on the track? Would love to go to those for the street, but worried about sidewall flex on the track
Yes. Since I drive to the track, I need one do-it-all tire, and these were top-rated on Tire Rack. No issues on track and very forgiving, they have grip approaching R-compound with a 300 wear rating. Phenomenal in wet also, and very quiet. I love these tires.
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  #28  
Old 04-29-2019, 09:29 PM
Andyz4 Andyz4 is offline
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Mein Auto: 2006 Z4 3.0si
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Originally Posted by janole View Post
and you are running those on the track? Would love to go to those for the street, but worried about sidewall flex on the track
Sure do, and these are wonderful track tires. Amazing grip wet or dry, zero issues and very predictable. And on the road they are quiet with a 300 treadwear rating. Tire Rack had the best deal on them.
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  #29  
Old 04-30-2019, 09:31 PM
Andyz4 Andyz4 is offline
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Mein Auto: 2006 Z4 3.0si
What are you running now?
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Last edited by Andyz4; 04-30-2019 at 09:35 PM.
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