So after lurking here for a while I decided to get lowered and went for the Eibach Pro-kit since it seemed to be the closest thing to stock ride.
While I absolutely will agree on that statement I also got a negative effect with vibrations at some speeds that I did not experience on stock
springs. I did have some VERY small vibrations but hardly noticeable most of the time and now they've gotten annoying so I'm trying to figure
out the cause.

I asked the guy who made the swap if they changed anything related to wheel alignment and he said no and that it should not be necessary.
Is that really correct? I remember that when going through the same procedure on the Audi I used to have they always made some adjustments
to the front end. But the BMW front end is different so I don't know if the same rule applies.

Could it also be that the small vibrations I used to have has been reinforced by the lowering? If so I should go and get the wheels balanced again.

Would appreciate some toughts from the forum on whether I should go for suspension adjustments or wheel balancing first. Or perhaps even something
else?

Besides this issue I'm extremely pleased with the springs. Car looks great and ride is still very comfortable even on the Swedish countryside's
infamous roads And no contact anywhere even though I'm running 255/35/20 on 9" ET20 rims in the front.

Too late to get pics now so I'll be back later in the week to show off the final result.

Cheers!

 

It sounds like you didn't get a wheel alignment after lowering? It's usually recommended that after you put lowering springs on you get a alignment done. Hope that helps.

 

Yeah I figured it would need a wheel alignment but this guy said it normally isn't needed. I guess that was bullcrap though so I'll talk to him again tomorrow.

 

You absolutely need an alignment done. He is a newb-ass mechanic.

 

+1 , not only recommended, rather necessary! With a lowering you change the balance completely - do it!

The vibrations CAN be a result of lowering, its not a must. Maybe after lowering your tires roll just on this mm, which wasn't used before..., it also can be possible, that the lower / harder springs "telephone" the vibs a bit more than the stock.

Also the chassis gums can suffer under the modified burden and transfuse the vibs.

First try complete alignment, then the next...

 

an alignment should be done after at least about 300 miles of driving after install where the springs had time to settle

 

Some say 2-3 miles, and others say 300 miles? There is quite a difference, which is correct?

 

If the springs are new it will definitely take more the 2-3 miles for them to settle.

 

If you get a lowering by your dealer, your car won't be moved one meter...

The new springs will settle after time, you do not have to drive 2 - 300 km before settings will be done.

You are clever doing a complete setting, when chancing the tires, so the mileage will be better

 

Looks like you need a wheel balance... If your steering turns left or right while driving straight then you need a wheel alignment. If you have an aftermarket rims, you might need a hub centric. Good luck!!!