Recent Topics
335i BMW Rear Bearing: DIY?
by antonmnster
07/18/18 10:39 PM
Noise on cold start
by Spetz
07/18/18 09:23 PM
FRAM TG4967 C&P
by JohnnyJohnson
07/18/18 09:10 PM
What is the longest you have had a car battery las
by wtd
07/18/18 09:00 PM
clicking noise front driver side
by tookien
07/18/18 08:57 PM
FRAM Ultra XG7317 at 10K miles cut open
by crazy_raccoon
07/18/18 08:45 PM
Amsoil SS 0w-30 1.4L Tur 2014 Chevy Cruz 20k OCI
by SubieBlue
07/18/18 08:42 PM
Unknown Found In Woodworking Estate Box
by Recalculating
07/18/18 07:57 PM
LM-100J (C-130) Airshow
by tom slick
07/18/18 07:47 PM
Eldora truck race tonight
by thooks
07/18/18 07:43 PM
Front wheel stud on a 2000 buick century
by JimmyJohns
07/18/18 07:41 PM
Ford 6.2 diesel
by buck91
07/18/18 07:34 PM
Weber gas grills & Weber 10 yr warranty
by Donald
07/18/18 05:50 PM
2008 Honda Odyssey oil and filter?
by CARJ
07/18/18 05:11 PM
Bugatti Veyron $21k oil change???
by wemay
07/18/18 05:07 PM
Nexen N Priz AH8 vs Hankook Ventus V2 Concept
by ET16
07/18/18 04:48 PM
1999 LeSabre to 2008 Lucerne
by Duffyjr
07/18/18 04:26 PM
Engine Oil "catch cans"
by TnMike46
07/18/18 04:17 PM
2018 Audi S4 4.5k mi Factory Fill
by Vigg
07/18/18 03:46 PM
RAGBRAI 2018
by DriveHard
07/18/18 03:23 PM
Newest Members
99SK04GTX, jasonjossens4231, Eneos1, tung, spacekiller67
65511 Registered Users
Who's Online
60 registered (antonmnster, aleneros, 87sammy, aquariuscsm, AVB, Ag76, 3 invisible), 1263 Guests and 31 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65511 Members
67 Forums
287301 Topics
4792835 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4551000 - 10/22/17 12:19 PM Koni FSD vs Bilstein B4 for 05 X3
Audios Offline


Registered: 11/19/11
Posts: 952
Loc: 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
2005 BMW M3 BMW Twin Power 10/60
1998 BMW M3/4/5 Fuchs 5/40
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

Top
#4551014 - 10/22/17 12:46 PM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
d00df00d Offline


Registered: 10/20/05
Posts: 11279
Loc: 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.
_________________________
2011 Mazda RX-8 R3
Mobil Super 5w-20

Top
#4551019 - 10/22/17 12:49 PM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6370
Loc: USA
Try the FSD smile

Top
#4551352 - 10/22/17 07:28 PM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
dan_erickson Offline


Registered: 08/05/10
Posts: 588
Loc: 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


Top
#4551482 - 10/22/17 09:31 PM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
MCompact Offline


Registered: 07/21/02
Posts: 4195
Loc: 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
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2016 i3 REX
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...

Top
#4551749 - 10/23/17 08:36 AM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
UG_Passat Offline


Registered: 05/27/08
Posts: 2007
Loc: NJ
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

Top
#4551835 - 10/23/17 10:44 AM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
Audios Offline


Registered: 11/19/11
Posts: 952
Loc: 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
2005 BMW M3 BMW Twin Power 10/60
1998 BMW M3/4/5 Fuchs 5/40
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

Top
#4551865 - 10/23/17 11:15 AM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
mightymousetech Offline


Registered: 04/03/17
Posts: 1476
Loc: 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

Top
#4551902 - 10/23/17 11:46 AM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
d00df00d Offline


Registered: 10/20/05
Posts: 11279
Loc: 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.
_________________________
2011 Mazda RX-8 R3
Mobil Super 5w-20

Top
#4551957 - 10/23/17 12:46 PM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
Audios Offline


Registered: 11/19/11
Posts: 952
Loc: 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
2005 BMW M3 BMW Twin Power 10/60
1998 BMW M3/4/5 Fuchs 5/40
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

Top
#4552219 - 10/23/17 05:30 PM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6370
Loc: 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

Top
#4552636 - 10/24/17 07:05 AM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
Audios Offline


Registered: 11/19/11
Posts: 952
Loc: 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
2005 BMW M3 BMW Twin Power 10/60
1998 BMW M3/4/5 Fuchs 5/40
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

Top
#4556239 - 10/27/17 12:21 PM Re: Koni FSD vs Bilstein B4 for 05 X3 [Re: Audios]
Audios Offline


Registered: 11/19/11
Posts: 952
Loc: 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
2005 BMW M3 BMW Twin Power 10/60
1998 BMW M3/4/5 Fuchs 5/40
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

Top