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Koni FSD vs Bilstein B4 for 05 X3 #4551000
10/22/17 11:19 AM
10/22/17 11:19 AM
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Audios Offline OP
Audios  Offline OP
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Now that the X has gotten a new head, its time for suspension! Rear coils are broken, so deciding between shocks and struts. The B4 and Konis I can get at basically the same price, so looking for experiences with either. Id normally go with the B4, but the Konis are on sale bringing the price down by 150. Im also considering the B4s from the sport package X3 for a little more, but want to confirm the springs are correct. Thanks


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551014
10/22/17 11:46 AM
10/22/17 11:46 AM
Joined: Oct 2005
Posts: 11,421
PA
d00df00d Offline
d00df00d  Offline
Joined: Oct 2005
Posts: 11,421
PA
FSD = WAY better ride quality
B4 = better longevity

Either should handle about the same as stock.

On any vehicle that I wasn't constantly pushing to its handling limits, I'd go FSD every time.


2008 BMW M3
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551019
10/22/17 11:49 AM
10/22/17 11:49 AM
Joined: Mar 2008
Posts: 7,325
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,325
USA
Try the FSD smile

Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551352
10/22/17 06:28 PM
10/22/17 06:28 PM
Joined: Aug 2010
Posts: 594
Crown Point, IN
dan_erickson Offline
dan_erickson  Offline
Joined: Aug 2010
Posts: 594
Crown Point, IN
My personal experience with the FSD struts was not good on my 2010 Accord when I owned it. Struts rode great but made a clunking noise over bumps and Koni refunded my money under warranty. But, you might be okay because your application is a BMW.


15 Accord Coupe EX-L V6 Navi
Castrol Magnatec 0w20

Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551482
10/22/17 08:31 PM
10/22/17 08:31 PM
Joined: Jul 2002
Posts: 4,548
KY
MCompact Offline
MCompact  Offline
Joined: Jul 2002
Posts: 4,548
KY
FSDs worked great on my Mazdaspeed 3; I usually put Bilsteins on my BMWs(and Jeep) but I'd think the Konis would be a good choice for your application.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i


Son's
2009 328i

Buy what makes you smile...
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551749
10/23/17 07:36 AM
10/23/17 07:36 AM
Joined: May 2008
Posts: 2,097
SoCal
UG_Passat Offline
UG_Passat  Offline
Joined: May 2008
Posts: 2,097
SoCal
The B4's are Bilstein's economy dampers, meant for OE replacments, which are twin-tube dampers

The Koni FSD's are theoretically should be an upgrade to the Bilstein B4's, which uses a similar technology to Monroe Sensatrac, which adjusts dampening and rebound for the conditions of the road and driver inputs to the suspension, which FSD's are typically tuned softer for the comfort frequencies and adjusts to be firmer for sportier frequencies, though not quite as firm as the Koni Sports.


2016 VW Tiguan|APR Stage 1|Neuspeed P-Flo|Osram CBI|Redline 5w30
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551835
10/23/17 09:44 AM
10/23/17 09:44 AM
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Audios Offline OP
Audios  Offline OP
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Going to go with the FSDs. Thanks for the help, will update with any issues that come up. The wife really uses this car most, and with the baby on the way trying to get everything ready. Also going to go with the heavy duty springs in the rear, in case I tow something small with the car.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551865
10/23/17 10:15 AM
10/23/17 10:15 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
The FSD may not be up to the task of stronger springs.

On the BMW boards, a lot of people go with something else after trying the FSD. YMMV.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551902
10/23/17 10:46 AM
10/23/17 10:46 AM
Joined: Oct 2005
Posts: 11,421
PA
d00df00d Offline
d00df00d  Offline
Joined: Oct 2005
Posts: 11,421
PA
I get the impression that a lot of people come to the FSD expecting that it'll be like any other "performance" damper, except with more of a comfort bias. IMO, what it's really for is improving ride quality with stock or stock-ish springs, without compromising handling.

If you want significantly better handling, you'll be disappointed with the FSD. I've also heard complaints that it makes the car feel weird at its handling limits. And it can't be expected to last longer than any other damper -- unlike Bilsteins, which are probably the longest-lasting dampers you can get.

But if you're happy with stock handling, don't push the limit, and want better ride quality, FSD is magic. I'm not sure anything on the market comes close. It's basically the perfect damper for... most people, really.


2008 BMW M3
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4551957
10/23/17 11:46 AM
10/23/17 11:46 AM
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Audios Offline OP
Audios  Offline OP
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Definitely not looking to push the handling limits of the car with a baby seat in the back haha. I ordered the FSD, Im sure they'll be fine for the 8k a year max this car sees.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4552219
10/23/17 04:30 PM
10/23/17 04:30 PM
Joined: Mar 2008
Posts: 7,325
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,325
USA
I missed that is was B4, OE replacement. B4 for the price of Koni's FSD is not a good deal at all, so definitely get the FSD!

Now, if it was a choice between B6 and FSD, then it's worth debating. But the FSD definitely > B4

Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4552636
10/24/17 06:05 AM
10/24/17 06:05 AM
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Audios Offline OP
Audios  Offline OP
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
The Konis were about 40% off, so they came down to the B4 price level. Hoping they get delivered today, I ordered new lower control arms, balljoints, and springs already, waiting on the Konis to start the install.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios] #4556239
10/27/17 11:21 AM
10/27/17 11:21 AM
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
Audios Offline OP
Audios  Offline OP
Joined: Nov 2011
Posts: 1,240
Lyndhurst NJ
The Konis shafts were considerably larger than the OE Sachs in the rear, and slightly larger in the front. So far very impressed with build quality, says made in Holland which is reassuring.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40

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