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Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking

Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 08-10-2010, 09:39 AM   #1
Bake
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ZHP Sedan still feels loose

I picked up a ZHP sedan last year with 74k miles and immediately noticed the suspension felt unstable. I changed the FCAB with heavy duty units purchased from Bavarian Autosport and swapped the RTAB with OEM units. These two changes made a huge difference in the handling, but I still feel like the car is not as solid as it should be. I had a 325ci with sports package prior to this ZHP sedan and I know it felt tighter than this does. My question is what other suspension tidbits are likley worn and are the culprits for this feeling? I want to inspect them and make knowledgeable replacements. This is my daily driver and I drive the terrible roads in NYC with my two young children in the car on a daily basis, so I am not really interested in going with any urethane bushings or lowered suspension. I just like my car to feel tight on the highway.
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Old 08-10-2010, 09:42 AM   #2
ChiMaster
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unstable is subjective - What exactly are the symptoms?
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Old 08-10-2010, 10:36 AM   #3
FamilyTruckster
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My ZHP felt like the front end was loose, especially when I went over railroad tracks or such. I figured it was the FCAB's as I experienced a similar issue with my E36 at about the same mileage (100k). My mechanic said it was the front sway bar links, I was skeptical but had them replaced. Sure enough, that fixed the problem. Might want to check into replacing those, they are cheap.
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Old 08-10-2010, 01:17 PM   #4
TxZHP04
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At 74k and considering that you've replaced CABs and RTABs, I would seriously start to suspect the dampers. Mine were blown before 70k.
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Old 08-10-2010, 03:44 PM   #5
Bake
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Quote:
Originally Posted by TxZHP04 View Post
At 74k and considering that you've replaced CABs and RTABs, I would seriously start to suspect the dampers. Mine were blown before 70k.
Are there specific symptoms that would confirm I need dampers? I don't disagree that at my mileage (82K now) I should replace them, but would hate to replace them and still have this issue.

Quote:
Originally Posted by FamilyTruckster View Post
My ZHP felt like the front end was loose, especially when I went over railroad tracks or such. I figured it was the FCAB's as I experienced a similar issue with my E36 at about the same mileage (100k). My mechanic said it was the front sway bar links, I was skeptical but had them replaced. Sure enough, that fixed the problem. Might want to check into replacing those, they are cheap.
Thanks. I assume, I could get my car on a lift and do a visual inspection of these and see if they are worn. I think I will bring my car in to our local E46fanatic sponsored shop and have them take a look for me so I can finally get to the bottom of this.

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unstable is subjective - What exactly are the symptoms?
During lane changes car still seems a bit squirrely. Before replacing the RTAB's I could barely keep the car in a lane.
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Old 08-10-2010, 08:27 PM   #6
pgj
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Quote:
Originally Posted by Bake View Post
I picked up a ZHP sedan last year with 74k miles and immediately noticed the suspension felt unstable. I changed the FCAB with heavy duty units purchased from Bavarian Autosport and swapped the RTAB with OEM units. These two changes made a huge difference in the handling, but I still feel like the car is not as solid as it should be. I had a 325ci with sports package prior to this ZHP sedan and I know it felt tighter than this does. My question is what other suspension tidbits are likley worn and are the culprits for this feeling? I want to inspect them and make knowledgeable replacements. This is my daily driver and I drive the terrible roads in NYC with my two young children in the car on a daily basis, so I am not really interested in going with any urethane bushings or lowered suspension. I just like my car to feel tight on the highway.
Is this maybe a steering issue?

I just stumbled over this thread:

http://forum.e46fanatics.com/showthread.php?t=470103
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Old 08-10-2010, 08:29 PM   #7
pgj
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nice car, BTW.
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Old 08-11-2010, 07:39 AM   #8
Bake
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Quote:
Originally Posted by pgj View Post
Is this maybe a steering issue?

I just stumbled over this thread:

http://forum.e46fanatics.com/showthread.php?t=470103
Interesting.....

Quote:
Originally Posted by pgj View Post
nice car, BTW.
Thanks bud.
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Old 08-11-2010, 09:21 AM   #9
jeremykrak
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You might wanna add a strut bar to the mix... I drove my ZHP with and without a strut bar and it's night and day in terms of how stiff it feels... like crazy! will never drive without a strut bar (the ACS that came with mine is SIIICK)
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Old 08-13-2010, 04:10 PM   #10
pgj
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I'd really like to hear how this turns out?
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Old 02-10-2011, 05:01 PM   #11
wrecklessfool
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You might check your tie rods for play in the ball joints. I am having the same feeling you are about how it should feel more "solid." I have replaced the front control arms, FCABs, Turner rear control arms, Rogue RTABs, new rear diff bushing, M3 motor mounts, Rogue transmission mounts, new tie rods (inner and outer), new wheels and tires, and a proper alignment with hand gauges the old school way. I am waiting on my sway bars to arrive so I can put on the new adjustable front endlinks. I'm hoping the guy above was right and maybe this will solve our issues.

No doubt that the car feels exponentially better than it did before all the work, but I feel like it's still not quite where it could be.
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