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Suspension & Braking Forum by BimmerWorld
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!
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Old 05-12-2013, 12:42 PM   #1
Koffinb
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My Ride: 04 330xi 6spd
Poly FCABs on XI

Thinking of going Poly FCABs on my XI since they dont make Meyle HD's for the XI versions. What do you guys think? I'd like a firmer, heavier steering response than OE. As opposed to lowering springs etc. to improve handling I thought i'd try this upgrade first.
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Old 05-12-2013, 08:01 PM   #2
lszlszx
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It'll be firmer, but you might feel some vibration through the steering wheel.
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Old 05-12-2013, 08:20 PM   #3
DavidDee
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Can anyone else with an XI add to this? I'm also deciding between oem bushings and Powerflex
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Old 05-12-2013, 08:20 PM   #4
Big Rick
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I just bought Powerflex bushings for the front and rear... I just need to get around to installing them!
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Old 05-13-2013, 03:02 AM   #5
Koffinb
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Originally Posted by lszlszx View Post
It'll be firmer, but you might feel some vibration through the steering wheel.
what kind of vibrations??
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Old 05-15-2013, 01:53 AM   #6
Sh0ty
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Any vibration that your lower control arm would experience during operation. This means as your tire rolls over the road, vibration. As you hit a bump, higher frequencies that are damped by rubber bushings will not be with the poly urethane. That said, in my opinion, the NVH increase from poly urethane suspension bushings is minimal / negligible. Engine mounts made of poly urethane are an entirely different story.

Of course, my opinion regarding PU bushings in the suspension is formed from my experience with a MKII Toyota MR2; I have not installed them into my E46. I suppose it all comes down to "what kind of constraint do you want to impose upon your control arms?" A race car utilizes spherical bearings to constrain articulation to a single point, allowing more precise tuning, an enthusiast installs PU for crisper feedback and more predictable suspension kinematics (mostly placebo for an amateur driver in my opinion, if you can feel .03" delta in deflection of your control arm inboard points, you're a CMM) and OEMs utilize rubber bushings to keep NVH low while ensuring more than adequate control of the suspension.
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