[bmw335ie90]

Originally Posted by whyzee125

It was the left rear wheel bearing! Got it replaced today and I literally cannot believe how quiet the car is inside. I'm a VERY happy camper and can now confirm the subframe bushings, in my experience, add very little NVH, with zero of that being noise. Thanks to all who suggested a bearing issue, you were in fact correct!

Damnit! Now these are back on the list of mods I need to do lol

[whyzee125]

Originally Posted by bmw335ie90

Damnit! Now these are back on the list of mods I need to do lol

Lol IMO you aren't really missing out. While the insane cabin roar was actually due to a bad wheel bearing in my case, I probably wouldn't do them again.

A lot of people say their car felt so unstable stock it was virtually unsafe, and that was never my experience. If my car HAD felt like that, they would be absolutely worth it. My car felt great, just a very small amount of squirm on WOT.

The squirm is gone but it's definitely somewhat harsher in the rear and while it's a subtle change, you notice after a while of daily driving that it does just beat you up a little more. It's dead quiet (thank God) but less refined. Cobblestone or ground down pavement, expansion joints, speed bumps, etc. really highlight the difference.

In other words, it's a lot better at WOT, but it's a little worse at everything else. Most of my driving is not WOT so to me, the $1600 and a minimal but constant decrease in ride quality was not worth it.

[The Nightman]

Originally Posted by whyzee125

Lol IMO you aren't really missing out. While the insane cabin roar was actually due to a bad wheel bearing in my case, I probably wouldn't do them again.

A lot of people say their car felt so unstable stock it was virtually unsafe, and that was never my experience. If my car HAD felt like that, they would be absolutely worth it. My car felt great, just a very small amount of squirm on WOT.

The squirm is gone but it's definitely somewhat harsher in the rear and while it's a subtle change, you notice after a while of daily driving that it does just beat you up a little more. It's dead quiet (thank God) but less refined. Cobblestone or ground down pavement, expansion joints, speed bumps, etc. really highlight the difference.

In other words, it's a lot better at WOT, but it's a little worse at everything else. Most of my driving is not WOT so to me, the $1600 and a minimal but constant decrease in ride quality was not worth it.

Glad you've resolved the issue and that it wasn't the subframe bushings. Appreciate the honest feedback too. Poly inserts seem like a good compromise on a street car.

NVH is so subjective. Eg everyone online claims that there was no increase in NVH with monoball tension struts (honeymoon phase?), but I found the increase in harshness unbearable for a daily driver.

[mattanderson]

whyzee125

Thanks for the honest review.

I've seen so many posts that say "there's literally no increase in NVH" and "they do it on the newer cars" as proof, it's nice to hear an informed opinion.

I have the inserts on mine. It improved the squirm under hard acceleration, though it's still there a little. Definitely worth the $ and effort, but I've always wondered if I should do a proper replacement.

[whyzee125]

Originally Posted by mattanderson

whyzee125

Thanks for the honest review.

I've seen so many posts that say "there's literally no increase in NVH" and "they do it on the newer cars" as proof, it's nice to hear an informed opinion.

I have the inserts on mine. It improved the squirm under hard acceleration, though it's still there a little. Definitely worth the $ and effort, but I've always wondered if I should do a proper replacement.

Yeah, I saw a lot of those reviews too and it's just not apples to apples. Completely different chassis and the F80s also have a ton of little vibration dampers on the chassis. It's not horrible by any means but it's definitely noticeable and feels a little mismatched compared to the rest of the car even with coilovers, M3 front arms, etc.

If I were to do it over again, I would go AKG 95A or just do inserts. I think the inserts are a great bang for the buck.

[Tambohamilton]

M3 RSFB FTW IMHO. YMMV.

Can't think of any more abbreviations to add.

[whyzee125]

Originally Posted by Tambohamilton

M3 RSFB FTW IMHO. YMMV.

Can't think of any more abbreviations to add.

frfr ong

[machine4321]

I had squiggle oem bushings. 3m poly filled them as best I could from underneath and that fixed the majority of the unsettled feeling.

Went with condor delrin RSFB and completely ruined the car lol. I didnt notice any more Noise but I could feel every single pebble/crack etc. for me, It was that moment I knew I had gone to far….

I would try yellow powerflex. Ive redone my e91 subframe and fully filled with 3m urethane so I will see how that feels first.

[Torgus]

Originally Posted by whyzee125

Lol IMO you aren't really missing out. While the insane cabin roar was actually due to a bad wheel bearing in my case, I probably wouldn't do them again.

A lot of people say their car felt so unstable stock it was virtually unsafe, and that was never my experience. If my car HAD felt like that, they would be absolutely worth it. My car felt great, just a very small amount of squirm on WOT.

The squirm is gone but it's definitely somewhat harsher in the rear and while it's a subtle change, you notice after a while of daily driving that it does just beat you up a little more. It's dead quiet (thank God) but less refined. Cobblestone or ground down pavement, expansion joints, speed bumps, etc. really highlight the difference.

In other words, it's a lot better at WOT, but it's a little worse at everything else. Most of my driving is not WOT so to me, the $1600 and a minimal but constant decrease in ride quality was not worth it.

How are solid subframe bushings $1600?

How much HP/TQ are you making?

Do you have an aftermarket diff? Are the diff bushings stock? Did you code out the E-Diff?

[Tambohamilton]

Originally Posted by machine4321

I had squiggle oem bushings. 3m poly filled them as best I could from underneath and that fixed the majority of the unsettled feeling.

Went with condor delrin RSFB and completely ruined the car lol. I didnt notice any more Noise but I could feel every single pebble/crack etc. for me, It was that moment I knew I had gone to far….

I would try yellow powerflex. Ive redone my e91 subframe and fully filled with 3m urethane so I will see how that feels first.

Just go with M3 instead of tinkering with aftermarket stuff or injecting urethane which will come unstuck.

[whyzee125]

Originally Posted by Torgus

How are solid subframe bushings $1600?

How much HP/TQ are you making?

Do you have an aftermarket diff? Are the diff bushings stock? Did you code out the E-Diff?

$300 for bushings and the rest was install, alignment, tax. It came to just under $1,600.

About 475whp and 500wtq

Mfactory LSD, stock diff bushings, and e-diff is coded out.

[Torgus]

You should upgrade your diff bushing to solid then you can whine like me