[Lancelot]

check this out too http://f30.bimmerpost.com/forums/sho....php?t=1372192

[///CSL]

Thanks, I've read it yesterday. All good reviews about ohlins, haven't seen anyone dislike them yet. I think that they are similarly priced as KW.

I would like to see DVCs experiences too because he tracks his car and have some additional interesting suspension mods.

[hardparker]

Originally Posted by Lancelot

Here's the pic to show what I mean with retrofitting F30 bushings onto F80 TS
The bushing center is slightly off and there's an indent - presumably to help rotate it.

That's a bonded and pressed bushing. No chance of rotating it.

[DVC]

Originally Posted by ///CSL

DVC any feedback about that ohlins?

Sorry I haven't posted my review of the Ohlins yet - I've been holding out until after the next track day (and have had to skip the last few)...I have one coming up in June.

[///CSL]

Ok

[Lancelot]

Hi

My powerflex F30 bushings have been backordered for a while now, and I've just realized that they're actually just inserts into the original bushing

https://www.powerflex.co.uk/black-se...rt+/12545.html

This is an insert that fits into voids in the original bush to reduce subframe movement

What do you make of that? I ordered those because the other brands were either in Australia (SuperPro) or in US (Delrin bushings at bimmerworld)

Surely the fitment will be much easier, but what can I expect in terms of actually improving handling from those inserts in your opinion?

TBH I think I'll stick with this choice as I'm not a hardcore track enthusiast, and just want to improve the rear floaty handling but I'm puzzled.

[Bee Pee]

Originally Posted by Lancelot

Hi

My powerflex F30 bushings have been backordered for a while now, and I've just realized that they're actually just inserts into the original bushing

https://www.powerflex.co.uk/black-se...rt+/12545.html


What do you make of that? I ordered those because the other brands were either in Australia (SuperPro) or in US (Delrin bushings at bimmerworld)

Surely the fitment will be much easier, but what can I expect in terms of actually improving handling from those inserts in your opinion?

TBH I think I'll stick with this choice as I'm not a hardcore track enthusiast, and just want to improve the rear floaty handling but I'm puzzled.

Lancelot,

marco_polo on Babybmw forum fitted just the lower half of the black inserts and found the NVH too much - he trimmed off the cup end and just re-inserted the remainder into the lower side voids [no dropping of the subframe] and is much happier.

http://www.babybmw.net/forum/viewtop...t=270#p1293534

I know Marco P well and trust his judgement - he recommends going for the yellows not the blacks.

BP

[Lancelot]

Thanks for the heads up; very suprised considering previous feedback on solid bushings was that there was no increase in NVH; i'll change my order for yellow ones, or just keep it for later then.

Do you think the delrin bushings would be different ?

[Bee Pee]

Originally Posted by Lancelot

Do you think the delrin bushings would be different ?

Not sure TBH - if they are solid then the NVH will increase compared stock rubber bushes which have voids in them.

Ref prior feedback - you must remember the guys in US tend to be earlier adopters than us here in EU plus they have much smoother roads with fewer twists/mile than we do here in the EU....

[Lancelot]

I can't reconcile that with the fact the F8x have no rear bushings, yet are not necessarily horrible in terms of NVH?
Or that the front subframe itself has no bushings either.

So I changed my order to yellow ones but still trying to make sense; you're probably right it's a matter of perception, now I'm wary of various feelings since some people love the H&R ARBs yet I dislike them being too stiff; I'll go 'conservative' then with the yellow ones - but with both top and bottom ones.

[Bee Pee]

Originally Posted by Lancelot

I can't reconcile that with the fact the F8x have no rear bushings, yet are not necessarily horrible in terms of NVH?
Or that the front subframe itself has no bushings either.

So I changed my order to yellow ones but still trying to make sense; you're probably right it's a matter of perception, now I'm wary of various feelings since some people love the H&R ARBs yet I dislike them being too stiff; I'll go 'conservative' then with the yellow ones - but with both top and bottom ones.

Lanceleot,

Makes sense plus you can always install inserts in phases i.e. install lower half 1st [easy DIY] and then try the car to gauge how it feels.

If its good and you are happy - job done.

If you want more then install upper inserts - more of a DIY/job as it involves dropping rear subframe to fit the upper insert parts

Look fwd to reading your feedback post install.

BP

[Lancelot]

I'm due for an ARB change (+ HJS downpipe ), now pushed back to Aug 18th because of the missing bushings - hope the powerflex arrive on time because I don't want to wait longer to put my M135 bars.
I should be able to post news then.

[DSH7]

Originally Posted by Bee Pee

Makes sense plus you can always install inserts in phases i.e. install lower half 1st [easy DIY] and then try the car to gauge how it feels.

Is this really an easy DIY? Are there instructions somewhere?

[Bee Pee]

Originally Posted by DSH7

Is this really an easy DIY? Are there instructions somewhere?

Install guide lines are on both Powerflex and S'pro's websites

[Lancelot]

I got the powerflex black fitted, since my attempt to change order from yellow to black after Bee Pee's warning was too late.

Overall I'm quite please with them;
Setup is really quite easy since they are inserts into the existing bushings, so the procedure to fit them is simple, and it can be reverted if the result isn't as expected.

The rear end definitely feels tighter, though I haven't pushed the car yet;

Noise: no change
Vibration: on very grainy surface it can become annoying after a while, however i'm just back from 5 hours of driving on different types of roads and it's barely noticeable.

So indeed overall quite pleased with this, looking forward to having a bit of fun with the car now

[abirmaher]

If anyone wants a set of these I have a brand new set I'm looking to get rid of. 300 shipped for now but willing to hear offers. Def me a message.

[ceedawg]

Originally Posted by Bee Pee

Powerflex now showing rear subframe bush inserts for F series cars.....

https://www.powerflex.co.uk/road-ser...s+-3189/1.html

My fear is the Delrin bushings or any stiffer bushing will create vibration in the interior,is this the case? I'm all for tightening up the rear suspension with a little sacrifice if the vibration is not crazee. I have inserts in my Mitsu/Eagle Talon and there is some vibration although not crazee.

PS what does NVH mean and are you guys recomending the yellows over the black bushings?

[ceedawg]

Originally Posted by Lancelot

I got the powerflex black fitted, since my attempt to change order from yellow to black after Bee Pee's warning was too late.

Overall I'm quite please with them;
Setup is really quite easy since they are inserts into the existing bushings, so the procedure to fit them is simple, and it can be reverted if the result isn't as expected.

The rear end definitely feels tighter, though I haven't pushed the car yet;

Noise: no change
Vibration: on very grainy surface it can become annoying after a while, however i'm just back from 5 hours of driving on different types of roads and it's barely noticeable.

So indeed overall quite pleased with this, looking forward to having a bit of fun with the car now

Excellent feedback ! Im on the fence as to whether to get the black or yellow.

[Bee Pee]

Originally Posted by ceedawg

Excellent feedback ! Im on the fence as to whether to get the black or yellow.

My advice would be go yellow as these are inserts so filling the voids of oem rubber bushes.

It reads like black series insert do introduce some NVH hence why I say yellows + plus you can fit inserts in stages - as I suggest earlier in this thread - to gauge the improvement vs. extra NVH, if any

[Lancelot]

Originally Posted by ceedawg

My fear is the Delrin bushings or any stiffer bushing will create vibration in the interior,is this the case? I'm all for tightening up the rear suspension with a little sacrifice if the vibration is not crazee. I have inserts in my Mitsu/Eagle Talon and there is some vibration although not crazee.

PS what does NVH mean and are you guys recomending the yellows over the black bushings?

NVH stands for Noise Vibrations and Harshness, https://en.m.wikipedia.org/wiki/Nois..._and_harshness

Honestly the black series here are barely noticeable when it comes to vibration, but i'm not so sure fitting half bushings is a good idea

What Bee Pee refers too is there was another thread for 1- or 2-series where someone mentioned the blacks were unbearable but he only fitted the bottom half and i wonder if that wouldn't be part of the issue, I decided to go ahead 100%, as a principle i prefer to fit parts as they were designed by manufacturer otherwise you can't know what to expect.

Anyway, I'm happy with the black series powerflex now, i also read threads about delrin bushings having no noticeable noise/vibrations either... note that M2/M3/M4 have no bushings on the rear, and our cars have no subframe bushings at the front (dampening arguably performed by control arm bushings though ?) but i'm taking care of that on Friday (hopefully if my superpro front control arms bushings have arrived!)

[ceedawg]

Originally Posted by Lancelot

NVH stands for Noise Vibrations and Harshness, https://en.m.wikipedia.org/wiki/Nois..._and_harshness

Honestly the black series here are barely noticeable when it comes to vibration, but i'm not so sure fitting half bushings is a good idea

What Bee Pee refers too is there was another thread for 1- or 2-series where someone mentioned the blacks were unbearable but he only fitted the bottom half and i wonder if that wouldn't be part of the issue, I decided to go ahead 100%, as a principle i prefer to fit parts as they were designed by manufacturer otherwise you can't know what to expect.

Anyway, I'm happy with the black series powerflex now, i also read threads about delrin bushings having no noticeable noise/vibrations either... note that M2/M3/M4 have no bushings on the rear, and our cars have no subframe bushings at the front (dampening arguably performed by control arm bushings though ?) but i'm taking care of that on Friday (hopefully if my superpro front control arms bushings have arrived!)

Are the yellows stiffer than the blacks and yes I will just use the whole bushing. Makes sense to just get the whole bushing set.
I am very surprised that the M3/4 does not use bushngs. Must be very harsh on the street I would imagine.

My experience with Delrin bushings especially on my AMG C43 suspension is that they are very very creaky noisy.

[Lancelot]

Originally Posted by ceedawg

Are the yellows stiffer than the blacks and yes i will just use the whole bushing.

I am very surprised that the M3/4 does not use bushngs.

My experience with Delrin bushings especially on my AMG C43 suspension is that they are very very creaky noisy.

Black are a bit stiffer than yellows in the powerflex line up, yellow material is more flexible; but since it only fills gaps in bushings that are otherwise rubber i'm not sure if the difference is huge, compared to full bushings where it should make a big difference