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      08-12-2021, 09:44 AM   #1
bigdaddycane
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F3X Struts

I had my F31 in at GT Peace in Chantilly yesterday for a suspension replacement and when the oem front struts were pulled out they were completely worn out. Not leaking, but could be depressed easily by hand. I changed out the suspension because I always felt the F3X suspension was not as good as the E9X or G2X versions, but I was really shocked (no pun) that the struts were completely gone at 95K.

I did Bilstein B8s with H&R springs, and strut bushings and the car feels amazing. The drop was perfect with my Apex SM-10s as well. I will post some pics when the car is clean.

Moral of the story: Don't assume BMW OEM shocks and struts last a long time
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Last edited by bigdaddycane; 08-12-2021 at 11:57 AM..
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      08-12-2021, 12:57 PM   #2
Eschmacher
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Good choice. The B8s don't feel too harsh?
I have H&R springs as well and love the height.
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      08-12-2021, 03:22 PM   #3
bigdaddycane
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Quote:
Originally Posted by Eschmacher View Post
Good choice. The B8s don't feel too harsh?
coming off of blown struts anything feels stiff. lol

The B8s were not much more money than the B6s so I went for the better shock / strut combo. I don't think its that harsh but its only been a day to get use to. Just took it for a long drive to WV for work and it was not bad at all.
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Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake Vorsteiner VFF 101s Ohlins

2014 Mineral White 328d Xdrive Wagon
Opticoat, Ventureshield, B8s, H&R, Apex SM-10s Hawk Pads,
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      10-11-2021, 11:08 AM   #4
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Quote:
Originally Posted by bigdaddycane View Post
coming off of blown struts anything feels stiff. lol

The B8s were not much more money than the B6s so I went for the better shock / strut combo. I don't think its that harsh but its only been a day to get use to. Just took it for a long drive to WV for work and it was not bad at all.
How's it been? My OEM struts are blown and have been thinking of swapping to B8s or Koni Sports.
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      10-11-2021, 11:12 AM   #5
exE36M3
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Do it. I'm a big fan of Koni personally - put over 100k on my E36 M3 for track days, commuting on Koni's and Eibach Springs. The instructors always commented how nice it all handled and rode.

Be sure to do the adjustable versions so you can fine tune your ride. If I recall, a full set is around $800-ish from Tire Rack.
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      10-11-2021, 06:19 PM   #6
bigdaddycane
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Originally Posted by _ObiJon View Post
How's it been? My OEM struts are blown and have been thinking of swapping to B8s or Koni Sports.
Its been great, sorry I have not posted pics, but the car has been dirty.

The ride quality is really good even on long road trips. I would highly recommend this setup.
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      10-12-2021, 02:18 PM   #7
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Thanks bigdaddycane and ExE46M3, looks like I'll go with the B8s vice the Konis for my refresh.
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      10-12-2021, 03:45 PM   #8
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Originally Posted by _ObiJon View Post
Thanks bigdaddycane and ExE46M3, looks like I'll go with the B8s vice the Konis for my refresh.
What springs will you run with them?
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      10-13-2021, 02:13 PM   #9
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Quote:
Originally Posted by bigdaddycane View Post
What springs will you run with them?
I'm currently on Dinan sport springs. I've read that the B8s can be harsh on high-speed compression but it can't be as harsh as blown OEM struts.
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      10-13-2021, 03:35 PM   #10
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Quote:
Originally Posted by _ObiJon View Post
I'm currently on Dinan sport springs. I've read that the B8s can be harsh on high-speed compression but it can't be as harsh as blown OEM struts.
You should be fine, I have H&Rs and they feel good.

The blown shock thing really just makes me shake my head. I wonder how long mine were blown....
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Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake Vorsteiner VFF 101s Ohlins

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Opticoat, Ventureshield, B8s, H&R, Apex SM-10s Hawk Pads,
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      10-13-2021, 04:46 PM   #11
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Quote:
Originally Posted by _ObiJon View Post
Quote:
Originally Posted by bigdaddycane View Post
coming off of blown struts anything feels stiff. lol

The B8s were not much more money than the B6s so I went for the better shock / strut combo. I don't think its that harsh but its only been a day to get use to. Just took it for a long drive to WV for work and it was not bad at all.
How's it been? My OEM struts are blown and have been thinking of swapping to B8s or Koni Sports.
Koni Sports are much less harsh than B8's. And the Koni's are adjustable for comfort. Both can handle a big drop but if you only intend to drop an inch or less then consider Koni Special Active. Like a sport and comfort shock in one with a dual frequency system designed with McLaren. Eibach springs are a great match because they aren't super stiff like H&R springs
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      10-13-2021, 05:08 PM   #12
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Quote:
Originally Posted by johnung View Post
Koni Sports are much less harsh than B8's. And the Koni's are adjustable for comfort. Both can handle a big drop but if you only intend to drop an inch or less then consider Koni Special Active. Like a sport and comfort shock in one with a dual frequency system designed with McLaren. Eibach springs are a great match because they aren't super stiff like H&R springs
I've had Koni Yellows (Sports) on a previous car (DSM) that were used as a custom coilover setup, modeled off of a well known autocrosser's build. It worked well and I loved the ride, even with a pretty heavy front Hyperco spring (800lb).

It's a good read: http://www.farnorthracing.com/autocross/konis.html

This was mainly due to Konis being the best OTS option for DSMs, better than BC/K-Sport or anything along those lines, just renamed. I would love to build something similar on this platform.
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      10-13-2021, 05:40 PM   #13
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Quote:
Originally Posted by bigdaddycane View Post
You should be fine, I have H&Rs and they feel good.

The blown shock thing really just makes me shake my head. I wonder how long mine were blown....
Agreed. I purchased the car with the current setup, additionally this is my first BMW, so it's hard for me to compare what it should feel like.
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