[D's Bimmer]

I recently changed from shocks from Bilstein B8's to Koni Yellow Sports. All seems to be good on that front. I kept my original Eibach Springs as they seemed fine but did have 100,000 kms on them from the Bilsteins.

The problem I am experiencing is that the back end is rubbing as the car seems to be compressing allot. I am wondering if I should now refresh the springs with the new set given that I now have about 120,000kms on those Eibachs?

If I should refresh the springs, what is the best setup up to get in terms of characteristics?

Thanks,

[Gohan335i7]

H&R Sport Springs!!!!!!!!!!!🤘😝🤘

[avocet]

do the koni's require bump stops?

[MightyMouseTech]

Get rims that fit properly?

[redline2001]

Originally Posted by avocet

do the koni's require bump stops?

yes

[D's Bimmer]

Originally Posted by MightyMouseTech

Get rims that fit properly?

Of course, why didn't I think of that. Really????

[Gohan335i7]

Why did you swap Bilsteins for the Konis to begin with?

[AtlasM]

Did you reuse the shock mounts from before or did you get new ones?

Originally Posted by chris@strutmonkey

Difficult to diagnose based on info provided, but my first guess would be that your rear Koni shocks are under dampening and need to be adjusted to make them firmer. Proper bumpstops would be my next guess. It is not likely the springs.
Best regards, Chris
www.strutmonkey.com

As brought up in another thread, doesn't the Koni adjustment only effect rebound? How much effect does the adjustment have on compression (if any)?

[ssdara]

Originally Posted by Gohan335i7

H&R Sport Springs!!!!!!!!!!!������

That will make him rub even more . What size tires? Scary that you're rubbing on Eibach springs, those are supposed to be conservative drop.

[RMNB]

Originally Posted by ssdara

That will make him rub even more . What size tires? Scary that you're rubbing on Eibach springs, those are supposed to be conservative drop.

^^^ +1 Very true. H&R are a bit lower but stiffer. I rubbed with H&R on previous F30 with just the Sports and people in the back. But for the most part it was great. I would double check your wheel/tire size as well.

[D's Bimmer]

My wheel setup is as follows:

19 x 8.5 35 Offset Front

19 x 9.5 30 Offset Rear

[RMNB]

Originally Posted by D's Bimmer

My wheel setup is as follows:

19 x 8.5 35 Offset Front

19 x 9.5 30 Offset Rear

I'm thinking it's your rear ET30 being the problem. New rims.

[HP Autosport]

Originally Posted by D's Bimmer

I recently changed from shocks from Bilstein B8's to Koni Yellow Sports. All seems to be good on that front. I kept my original Eibach Springs as they seemed fine but did have 100,000 kms on them from the Bilsteins.

The problem I am experiencing is that the back end is rubbing as the car seems to be compressing allot. I am wondering if I should now refresh the springs with the new set given that I now have about 120,000kms on those Eibachs?

If I should refresh the springs, what is the best setup up to get in terms of characteristics?

Thanks,

If you didn't rub before, you shouldn't rub now because of a shock change. Shocks do not determine the total stroke of the suspension, but the bumpstop can be a limiting factor. Is there Bilstein supplied bumpstops? Perhaps those are longer or stiffer than the OE(Koni shocks use OE bumpstops)?

120K km could cause some springs to sag or lose its tension. You should inspect the springs for any damage and replace as needed.

Originally Posted by FCobra94

As brought up in another thread, doesn't the Koni adjustment only effect rebound? How much effect does the adjustment have on compression (if any)?

None.