E90Post
 


GetBMWParts
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > why are aftermarket suspension components for BMW better than OEM?



Reply
 
Thread Tools Search this Thread
      02-23-2009, 08:20 AM   #1
Tallest
Major General
Tallest's Avatar
No_Country
105
Rep
5,248
Posts

 
Drives: TiAg Z4 Coupe 3.0Si
Join Date: Sep 2007
Location: ***

iTrader: (1)

Garage List
why are aftermarket suspension components for BMW better than OEM?

Just curious - do they have better testing facilities to design suspension better than OEM? I mean BMW spends millions of dollars finetuning its setups and it goes through hundreds thousands of miles of testing before the product is ready. What kind of research goes behind KW, H&R, Koni, Bilstein, etc?

I'm looking to be convinced why should I stick with non OEM suspension for my 50000 dollar car. I think BMW did get it wrong with RFT tyres though, so I am open to all arguments here.
__________________
'07 TiAg BMW Z4 Coupe 3.0si / Everything
Appreciate 0
      02-23-2009, 10:58 AM   #2
branabolic
Major
branabolic's Avatar
10
Rep
1,037
Posts

 
Drives: e92 335i
Join Date: Apr 2008
Location: so. new hampshire

iTrader: (5)

stock suspension is all about compromise. not everyone buying this car wants it to handle superbly and is willing to sacrifice some ride comfort. aftermarket companies have to opportunity to market to a more focused group of buyers thus allowing them to make a more performance oriented system
__________________
i'm not addicted to boost, but i sure am more fun when i'm on it.
Appreciate 0
      02-23-2009, 10:59 AM   #3
KL2DC
Moderator
KL2DC's Avatar
United_States
196
Rep
17,753
Posts

 
Drives: E90 328i, E85 Z4 3.0i
Join Date: Jan 2006
Location: DC Metro

iTrader: (22)

Garage List
2011 E90 328i  [0.00]
2006 E85 Z4 3.0i  [0.00]
Send a message via MSN to KL2DC
Quote:
Originally Posted by branabolic View Post
stock suspension is all about compromise. not everyone buying this car wants it to handle superbly and is willing to sacrifice some ride comfort. aftermarket companies have to opportunity to market to a more focused group of buyers thus allowing them to make a more performance oriented system
100%
__________________

Official DC Metro Registry - Current, New & Prospective Area Members Roll Call!
Appreciate 0
      02-23-2009, 11:09 AM   #4
mike-y
just another bmw douche bag
United_States
36
Rep
3,398
Posts

 
Drives: 1.9L of fury
Join Date: Nov 2008
Location: Los Angeles, CA

iTrader: (4)

Better is subjective, based on what your needs for the car are. the OEM suspension is a good mix of comfort and performance. And with it being a mass produced part for hundreds of thousands of cars, BMW needs to be able to have the parts made economically, so they can turn a profit. So in most cases, an OEM suspension is decent, but may not have the features you can get with a nice aftermarket setup.

Aftermarket setups can give you stiffer springs for better cornering performance, height adjustability, and damping adjustability. So if any of those things are important to you, and you can sacrifice a little comfort, and/or ride height, then that's why you would switch. Otherwise, if you are happy with the stock suspension, then stick with it.


Edit: branabolic pretty much summed it up.
Appreciate 0
      02-23-2009, 12:04 PM   #5
scottp999
Brigadier General
scottp999's Avatar
57
Rep
4,666
Posts

 
Drives: 335i - E92 - 6MT & 4runner SR5
Join Date: Mar 2007
Location: MD

iTrader: (1)

Garage List
2007 BMW 335  [4.50]
A happy medium looks to be the BMW Performance Suspension, mentioned by Tischer BMW in the sponsors area.
__________________
Rob Beck Turbos, PROcede Rev. 3, Procede Fueling Flash (via OpenFlash Tablet), PPS Methanol System (Devil's Own 12 GPH Nozzle/Aquamist Flow Sensor/Labonte VC25), DCI, Quaife LSD, BMW Performance Suspension, Autobahn Exotics Exhaust, Helix FMIC, AR Design Downpipes, BSH Catch Can, Forge Diverter Valves, P3cars Vent Boost Gauge, Alufelgen CSL Reps, Lux 5.1 H8 Angel Eyes, HPB HID Fogs, LTBMW M3 Side Skirts, BMW M3 Rear Spoiler, BMW Front Aero Lip, BMW Pedal Kit, BMW M Shift Knob, Autotecknic Matte Black Grilles.
Appreciate 0
      02-23-2009, 12:58 PM   #6
The Cleaner
Thats all you need to know.
The Cleaner's Avatar
United_States
14
Rep
1,141
Posts

 
Drives: 2013 335is , 2013 X5
Join Date: Dec 2006
Location: Nor Cal

iTrader: (2)

Send a message via AIM to The Cleaner
"Better" depends on what you are doing. For the street most aftermarket stuff is overkill. For example lowering a street car has largely negative results for a daily driver. Plenty of people will disagree but it's true. If a lowered car with super stiff suspension was desirable car manufacturer would build them that way.
__________________
- 335is E92 2013 [Sapphire Black/Grey]
- X5 E70 2013 [Sparkling Bronze/Cinnamon]
1981 Delorean number 6489 --- Took Delivery 1.20.88
Appreciate 0
      02-23-2009, 01:19 PM   #7
SV Concepts
SV Concepts's Avatar
United_States
171
Rep
5,869
Posts

 
Drives: Vorsteiner E60 M5
Join Date: Mar 2006
Location: 1460 White Oaks Rd. Suite F. Campbell, CA 95008

iTrader: (10)

Quote:
Originally Posted by branabolic View Post
stock suspension is all about compromise. not everyone buying this car wants it to handle superbly and is willing to sacrifice some ride comfort. aftermarket companies have to opportunity to market to a more focused group of buyers thus allowing them to make a more performance oriented system
Couldn't have said it better myself.
But to clarify... BMW OE is about "good" handling and "good" comfort, whereas aftermarket can be adjusted to be "good" handling and "great" comfort, "great" handling and "fair" comfort, or any combination thereof... BMW aims for the baseline of what consumers will want, and hits it right on the mark.

Now, if you buy a 997 GT3 RS... OEM is going to be roughly as good at handling as any aftermarket setup (well, almost...) because Porsche designs it for a specific purpose

Your 3 series wasn't designed for the track. But you can fix that
JL
Appreciate 0
      02-23-2009, 05:32 PM   #8
stressdoc
Moderator
stressdoc's Avatar
Dominica
139
Rep
10,169
Posts

 
Drives: F80 YMB
Join Date: Jun 2005
Location: MO

iTrader: (0)

Bilstein, Boge, et al make the dampers for BMWs. Aftermarket products are designed for more specific needs. You are correct that BMW burns a ton of cadcam & track time designing the OEM systems, and those of us that play around with swapping out parts can't hope to approach the level of tuning that BMW can. But that doesn't stop us.
Appreciate 0
      02-25-2009, 02:59 PM   #9
Tallest
Major General
Tallest's Avatar
No_Country
105
Rep
5,248
Posts

 
Drives: TiAg Z4 Coupe 3.0Si
Join Date: Sep 2007
Location: ***

iTrader: (1)

Garage List
yeah, i mean i dont want to bash aftermarket, im genuinely interested if the aftermarket guys really do deliver better products or not.

I am aware that KONI for example has huge testing facilities and read article about their FSD system that left me pretty convinced they have the tradition and knowledge, do talk to manufactueres a lot (sponsoring McLaren F1 I guess is nice bonus too)--- so I'm quite sure they know what they are doing.

and then there are posts like this one that make you wonder if the aftermarket guys really do know what they're doing... :S http://www.e90post.com/forums/showthread.php?t=224928
__________________
'07 TiAg BMW Z4 Coupe 3.0si / Everything
Appreciate 0
      02-25-2009, 06:09 PM   #10
branabolic
Major
branabolic's Avatar
10
Rep
1,037
Posts

 
Drives: e92 335i
Join Date: Apr 2008
Location: so. new hampshire

iTrader: (5)

^haha all these threads about clunking noises are the only thing scaring me from pulling the trigger on some coilovers right now. well that and the fact that i can't find a shop to install them for less than $600!
__________________
i'm not addicted to boost, but i sure am more fun when i'm on it.
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 04:32 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST