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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Powerflex vs OEM M3 subframe bushings



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      08-16-2014, 12:25 AM   #1
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Powerflex vs OEM M3 subframe bushings

Anyone ride in a car with both of these options?

Trying to decide between OEM and the Powerflex bushings for my E92 rear subframe.

Trying to get my suspension track(ish) ready, also wondering if people think the M3 front control arm upgrade makes a noticeable difference? What about OEM front M3 sway bar?
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      08-16-2014, 02:51 AM   #2
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I want to know too.
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      08-16-2014, 06:15 AM   #3
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I can't compare the two directly but the bushing insert install vs OEM M3 is much easier. I did the Whiteline kit (appears same as Powerflex but cheaper) on my car because I did not want to do the much greater difficulty install of OEM's. Plus the inserts are reversible should you ever want to do that.

They (inserts) make a big difference, probably the OEM M3 would make more of one. But for ~90% or more the benefit at a fraction of the time and cost, I went with the inserts. Good thread here:

http://www.e90post.com/forums/showth...ight=sway+rear

If you are seriously tracking the car and plan to wring every last drop out of it do the OEM. Or you could do the inserts (literally only takes and hour), see how you like them, and if you want to go all the way do the OEM next time the subframe is off (like when you decide you want the sway bar or other stuff). I did the M3 rear bar at the same time as the inserts, rear bar took forever, bushing inserts were almost trivial.
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      08-16-2014, 10:21 AM   #4
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Quote:
Originally Posted by ajsalida View Post
I can't compare the two directly but the bushing insert install vs OEM M3 is much easier. I did the Whiteline kit (appears same as Powerflex but cheaper) on my car because I did not want to do the much greater difficulty install of OEM's. Plus the inserts are reversible should you ever want to do that.

They (inserts) make a big difference, probably the OEM M3 would make more of one. But for ~90% or more the benefit at a fraction of the time and cost, I went with the inserts. Good thread here:

http://www.e90post.com/forums/showth...ight=sway+rear

If you are seriously tracking the car and plan to wring every last drop out of it do the OEM. Or you could do the inserts (literally only takes and hour), see how you like them, and if you want to go all the way do the OEM next time the subframe is off (like when you decide you want the sway bar or other stuff). I did the M3 rear bar at the same time as the inserts, rear bar took forever, bushing inserts were almost trivial.
This is great to know. I'm actually trying to prep my car for an upcoming track day and a bandaid fix (inserts) would probably be sufficient. Do you happen to have a link to the white line inserts?
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      08-16-2014, 12:19 PM   #5
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Quote:
Originally Posted by spxxx View Post
This is great to know. I'm actually trying to prep my car for an upcoming track day and a bandaid fix (inserts) would probably be sufficient. Do you happen to have a link to the white line inserts?
here ya go

http://www.whiteline.com.au/product_..._number=KDT918
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      08-16-2014, 12:31 PM   #6
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Just bought the WhiteLine version of these inserts... $50 shipped! I'm going to try and install these over the week before the track day next Sunday to see how these perform when pushed to the limit.
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      08-16-2014, 01:08 PM   #7
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I agree - this is a cheap, easy and very effective mod.
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      08-16-2014, 04:58 PM   #8
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I would suggest finding a road where you know the rear is being stressed to stay planted, say mid-corner under power with some bumps or washboard. Someplace you know or suspect the subframe is moving around. Run it a few times before you install the bushings, then after.

I live on a gravel road and have many poor surfaces locally to choose from both paved and not. Difference is pretty obvious before/after.
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      08-21-2014, 07:20 AM   #9
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I have had both and the powerflex yellow are better IMHO. Full replacements not inserts
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      08-21-2014, 07:27 AM   #10
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Quote:
Originally Posted by robc1976 View Post
I have had both and the powerflex yellow are better IMHO. Full replacements not inserts
Really, that is interesting. Could you elaborate? If I ever do an LSD I was planning on doing the full M3 bushings.
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      08-21-2014, 08:46 AM   #11
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Quote:
Originally Posted by robc1976
I have had both and the powerflex yellow are better IMHO. Full replacements not inserts
Good to hear, I'm putting a band aid in the problem for now with the inserts. Can you explain how the power flex bushings are better than OEM m3? I'll definitely be buying one of the two in the future
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      08-21-2014, 08:57 AM   #12
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Quote:
Originally Posted by spxxx View Post
Good to hear, I'm putting a band aid in the problem for now with the inserts. Can you explain how the power flex bushings are better than OEM m3? I'll definitely be buying one of the two in the future
That is exactly what I am doing with the inserts, band aid. Pretty good band aid but once the subframe comes off again for other reasons was going to do full bushing upgrade.
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      08-21-2014, 08:58 AM   #13
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Quote:
Originally Posted by spxxx View Post
Good to hear, I'm putting a band aid in the problem for now with the inserts. Can you explain how the power flex bushings are better than OEM m3? I'll definitely be buying one of the two in the future
M3 transferred vibration from side to side, a lot harsher and when taking harder turns the M3 seemed to lean/sag More than the powerflex.
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      08-21-2014, 10:17 AM   #14
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Quote:
Originally Posted by robc1976 View Post
M3 transferred vibration from side to side, a lot harsher and when taking harder turns the M3 seemed to lean/sag More than the powerflex.
That is very interesting. Was the install easier on the P-flex as well? It looks like they are not as hard to get in.
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      08-21-2014, 03:05 PM   #15
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I have the Whiteline Inserts. It's the best $50 suspension mod. Big difference over just the stock bushings.
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      08-21-2014, 03:54 PM   #16
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When I got the Powerflex bushings installed on mine, the mechanic complained about how hard it was to fit them. They had been 3 guys and a press(?) to fit them.
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      08-21-2014, 06:14 PM   #17
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Looks pretty difficult:

http://www.e90post.com/forums/showthread.php?t=802073
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      08-21-2014, 06:26 PM   #18
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Quote:
Originally Posted by robc1976 View Post
M3 transferred vibration from side to side, a lot harsher and when taking harder turns
we need more info for this strong statement

Did you have M3 bushes at the same time as you rDiff lock down kit and LSD?

All evidence I found is that diff lock down bushes and other aluminum bushes make subframe bushes more harsh - esp stiff ones like derlin/aluminum, in your case this could have been the m3 bushes because of your diff lockdown then your lsd
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      08-22-2014, 09:23 AM   #19
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Quote:
Originally Posted by andrey_gta View Post
we need more info for this strong statement

Did you have M3 bushes at the same time as you rDiff lock down kit and LSD?

All evidence I found is that diff lock down bushes and other aluminum bushes make subframe bushes more harsh - esp stiff ones like derlin/aluminum, in your case this could have been the m3 bushes because of your diff lockdown then your lsd
What difference does it make...he has all that stuff NOW in addition to the Powerflex bushings and they still have shown to be much more compliant. If he didn't have the lock down kit and LSD w/ the M3 bushings, having those items would have obviously made it even worse.
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      08-22-2014, 10:24 AM   #20
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Quote:
Originally Posted by andrey_gta View Post
we need more info for this strong statement

Did you have M3 bushes at the same time as you rDiff lock down kit and LSD?

All evidence I found is that diff lock down bushes and other aluminum bushes make subframe bushes more harsh - esp stiff ones like derlin/aluminum, in your case this could have been the m3 bushes because of your diff lockdown then your lsd
All at the same time, then switched to powerflex. I noticed no vibration with lockdown and this is with 2 other cars that I have installed this on. One has M3 and other has powerflex. I prefer the powerflex. The M3 would have to be marginally better also for the pain of installation. I can swap out powerflex in under 2 hours, not happening with M3. I have a ton of M3 parts but this is not one I will have. I will also say I prefer the powerflex sway-bar bushing a lot better also as they do not bind the suspension and move freely on the bar. I noticed less vibration with this also. With all that said I wouldn't go powerflex black either.
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      08-22-2014, 10:49 AM   #21
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Quote:
Originally Posted by robc1976 View Post
I will also say I prefer the powerflex sway-bar bushing a lot better also as they do not bind the suspension and move freely on the bar. I noticed less vibration with this also.
Hmm...interesting. Wonder how they compare with the BMW Motorsport versions.
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      08-22-2014, 11:03 AM   #22
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Quote:
Originally Posted by FCobra94 View Post
Hmm...interesting. Wonder how they compare with the BMW Motorsport versions.
I am pretty happy with them, I regret not using them on the rear sway-bar.
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