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Suspension & Braking Forum by BimmerWorld
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Old 07-02-2019, 02:23 PM   #1
76m2002
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Location: Rochester, NY
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My Ride: 2002 325iT
Year: 2002
Model: 325iT
Transmission: 5-speed
Monoball experience

Has anyone tried the Turner (or other brand) monoball FCABs and RTABs? Can you compare them to polyurethane for NVH? This is for a 2002 325iT that is a dual-duty track/daily driver. I'd like the improved steering for the track and don't mind a little increase NVH, but I don't want it to clank like a full, metal-metal racecar. This is my daily driver, but it already has Koni sport shocks, H&R race springs, and Hotchkis sway bars, so its no longer stock.
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Old 07-05-2019, 07:42 PM   #2
Schmidty_
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My Ride: 05 ZHP 12 X5M 14 235
Year: 2005
Model: 330i ZHP MBM Sedan
Transmission: A/T
I did the "Camry" upgrade RTABs in my ZHP, they tightened the rear up a little. They are a sealed spherical bearing from MOOG, PN# K200786.
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2005 ZHP Mystic Blue Metallic Sedan - (1/19 in NA) Koni Sport M3 struts, Eibach M3 Springs, M3 rear brace, Powerflex Black FCAB, "Camry" MOOG RTABs, K&N Intake, G.A.S. DISA, G.A.S. Rad Cap, SAP Delete

2012 X5M Black Sapphire Metallic - JB4, DownPipes, Exhaust

2014 M235i Mineral Gray Metallic 6MT - JB4 w/ MHD BEF, CP, TIC, DP, I, E, Pure Inlet, N20 MAP, BMS Oil Cooler Valve, F80 Rear Brace, GC Camber Plate
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Old 07-06-2019, 07:00 AM   #3
Bmsluite
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For FCAB I would go with Z4M bushings. They are solid rubber but offset. It greatly improves the steering feel. Basically transforms the whole car. No extra NVH

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Old 07-07-2019, 10:03 AM   #4
Schmidty_
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My Ride: 05 ZHP 12 X5M 14 235
Year: 2005
Model: 330i ZHP MBM Sedan
Transmission: A/T
For the front, yes the Z4M CAB helps with the geometry. If you want monoball/spherical bearing for the FCAB, the M3 strut and top hat change the geometry a lot and was a significant improvement for the ZHP.
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2005 ZHP Mystic Blue Metallic Sedan - (1/19 in NA) Koni Sport M3 struts, Eibach M3 Springs, M3 rear brace, Powerflex Black FCAB, "Camry" MOOG RTABs, K&N Intake, G.A.S. DISA, G.A.S. Rad Cap, SAP Delete

2012 X5M Black Sapphire Metallic - JB4, DownPipes, Exhaust

2014 M235i Mineral Gray Metallic 6MT - JB4 w/ MHD BEF, CP, TIC, DP, I, E, Pure Inlet, N20 MAP, BMS Oil Cooler Valve, F80 Rear Brace, GC Camber Plate
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Old 07-07-2019, 10:10 AM   #5
76m2002
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My Ride: 2002 325iT
Year: 2002
Model: 325iT
Transmission: 5-speed
Thanks for the suggestions. I've been running the Z4M offset FCAB, and just ordered the Powerflex black offset equivalent. For the rear, I opted for the Bimmerworld RTAB bearing replacement kit, which replaces the bushing with a sealed bearing, as used in the rear outer control arm. This was not as cheap as the Camry option (which I really like) but was about half the price of the Turner or GC equivalent.
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Old 07-15-2019, 05:34 PM   #6
E46Newbz
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Quote:
Originally Posted by Bmsluite View Post
For FCAB I would go with Z4M bushings. They are solid rubber but offset. It greatly improves the steering feel. Basically transforms the whole car. No extra NVH

Sent from my VS988 using E46Fanatics mobile app
Sorry for the noob question but how does it being offset help? I'm in need of new front bushings myself. Thanks.
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Old 07-15-2019, 05:45 PM   #7
76m2002
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My Ride: 2002 325iT
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Transmission: 5-speed
It changes the geometry of the control arm slightly, and gives you a bit of positive caster, which improves high speed stability.
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Old 07-15-2019, 06:29 PM   #8
E46Newbz
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Thanks, boss. I'll look into getting a set.
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Old 07-24-2019, 11:24 AM   #9
the fly
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Quote:
Originally Posted by E46Newbz View Post
Sorry for the noob question but how does it being offset help? I'm in need of new front bushings myself. Thanks.
I pre-press OE Z4M solid rubber bushings for folks here:

https://forum.e46fanatics.com/showthread.php?t=1119519

It's a popular upgrade for non-M e46's...
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Old 07-28-2019, 02:40 PM   #10
KlausH79
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Join Date: Nov 2013
Location: Denmark
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My Ride: 2001 325ti
Monoball experience

During my complete subframe restoration project I have designed my own RTAB “monoball bushings”





It’s basically a Meyle monoball bearing with two aluminum “adapter rings” around it so it fits the trailing arm. I haven’t assembled it all yet so I don’t know about performance but given the simple design my expectation is that it’s just like any of the other sealed bearing solutions out there.....at a fraction of the cost. I have two extra sets laying around due to the MOQ at the shop which made them. PM me if you want to have a set and we’ll figure something out.


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Last edited by KlausH79; 07-28-2019 at 02:53 PM.
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Old 07-28-2019, 04:12 PM   #11
76m2002
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My Ride: 2002 325iT
Year: 2002
Model: 325iT
Transmission: 5-speed
Very nice! It looks very much like the Bimmerworld bearing. Thanks very much for the offer, but I just installed the Bimmerworld bearing.
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Old Yesterday, 06:37 AM   #12
rkneeshaw
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Quote:
Originally Posted by KlausH79 View Post
During my complete subframe restoration project I have designed my own RTAB “monoball bushings”

Dude, that's awesome, nice job!

Very simple design. And you can replace those sealed bearings with readily available aftermarkets it looks like.

How do they fit?

You really should consider reselling them.
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