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      06-26-2019, 01:26 PM   #45
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Originally Posted by Solidjake View Post
Man I can't imagine how it is for you. It's driving me mad. I will definitely let you know. Results are immediate when adjusted so crossing my fingers. Just need it tight enough to remove any slack in the arm.
I put on loud tires and brake pads so I have a bit of a rolling orchestra between all that and the burbles from BM3 hahaha.

I'll see if I can get a clip of my cold start for everyone to enjoy.
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      06-26-2019, 07:20 PM   #46
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Here is a video of mine from cold start up. I start the sound clip by the tail pipes then move to under the car by the front wheels then engine bay and finally back to under car nr front wheels which is where you hear it most. I get this noise from idle on cold but I also hear it slightly when revving engine once warm and while driving with throttle (on enclosed roads where the sound echoes off the surrounding walls or bushes etc).

I had a new wastegate actuator from Germany for £300 as old one was slack. From other videos the wastegate flap can make a noise but that's in the engine bay and sounds similar to a simmering pot.

The sound I have almost disappears in sport mode but can hear it faintly still (can live with that).

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      06-26-2019, 07:31 PM   #47
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Another video from cold start.

Recorded from under car nr front wheels. That tinny rattley sound I get still when warm while driving.

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      06-29-2019, 02:21 PM   #48
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Turned the nut towards the front of the car two revolutions. Rattle that was in sport mode is not gone but the rattle in comfort still there (sounds about the same but extremely annoying) I tried to turn the L bracket a bit as well which I do not have in the vid.

I will post the vid in a few hours when I get back home from work.
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      06-29-2019, 06:12 PM   #49
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Sorry jake. Which nut you referring too?

Btw my wastegate actuator is brand new. Am still hoping something has fallen apart from the dp or similar?
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      06-30-2019, 03:43 PM   #50
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Quote:
Originally Posted by Solidjake View Post
I replaced my wastegate actuator because it was not moving properly. New OEM unit doesn't have the black plastic near those two nuts. DO NOT MOVE THOSE NUTS. Doing so you are changing the tension on the arm which affects the amount of boost. You turn it you can damage the turbo. The rattle problem lies where the arm goes to lever that comes out of the turbos wastegate. When I do my downpipe I will check to see how much play there is. You

One thing that is interesting... that I cannot figure out and I want you guys to test this out for me. Leave the car in comfort with your windows down, see if you have the rattle when driving. Then drive the same but in sport mode and let me know if the rattle goes away.

I have a rattle at 1500-2000 rpm in comfort but GONE in sport same RPM range. I think the sport mode tightening up the actuator/wastegate arm and it keeps it tight preventing it from closing all the way and letting it rattle. If you guys have the same then it is most definitely the wastegate inside of the turbo...
All of the above is exactly the same as me!!! New actuator as rod was slack etc but still have noise. Near enough goes in sport mode. BUT the sound sounds like it comes from under the car? Is it resonating?
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      06-30-2019, 04:00 PM   #51
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All of the above is exactly the same as me!!! New actuator as rod was slack etc but still have noise. Near enough goes in sport mode. BUT the sound sounds like it comes from under the car? Is it resonating?
Yea it's from the wastegate. Today I'll have the vid up, work ran long yesterday.

If you turn the nut one rotation it should be gone in sport. It will eventually come back. I have to see how my finances are and I will most likely get the MHI turbo and have a shop that specializes in turbos rebuild the wastegate flapper/arm so it will be bulletproof.
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      06-30-2019, 04:08 PM   #52
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I will ask my local specialists about a rebuild. He says the turbo is fine and nothing will happen to turbo etc cos of the slack in the wastegate. BUT it's pissing me off. Wonder how it sounds to passers by?
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      06-30-2019, 05:22 PM   #53
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Wonder how it sounds to passers by?
Like crap.... not how a BMW is supposed to sound. Makes me miss my E46 even more.
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      07-03-2019, 02:29 PM   #54
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Has anyone tried adjusting the actuator rod?
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      07-10-2019, 09:06 PM   #55
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Hey guys,

I went to the dealer today for the noise. I received the car about 2 weeks ago (328iX 2015) and started noticing the waste gate rattle as described in the thread. The dealer's mechanic was looking at me like I was crazy. He drove the car nothing. They agreed to keep the car a couple of hours to let it cool and try again. It was there and louder when Id rev it slightly. He confirmed it's the waste gate and we went inside to see if it's covered by the warranty. But first he wanted to confirm if its normal behavior of the car and took me to see another customers car and same thing the rattle is there but much less. He said it's "A feature of the car" nothing to be fixed and not to worry. Once home I found various threads here and noticed the rod is pretty loose. I could tighten the nut but from what I understand the rattle will just come back later on OR might not get rid of it completely.

My question is If I let it get a bit worse and bring it back to the dealer is it going to be covered under the power train warranty (I have 2 more years on warranty) ? Would the problem come back after a while with new turbos ?

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      07-18-2019, 04:27 PM   #56
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Hi. Any updates jake?
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      07-18-2019, 09:51 PM   #57
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Quote:
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Hi. Any updates jake?
Rattle is still there. Still there in sport as well. Having a shop install an aftermarket wastegate is the only real fix
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      07-19-2019, 09:47 AM   #58
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Quote:
Originally Posted by Solidjake View Post
Quote:
Originally Posted by 328iking View Post
Hi. Any updates jake?
Rattle is still there. Still there in sport as well. Having a shop install an aftermarket wastegate is the only real fix
Turbo off job? Like rebuilding the turbo?
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      07-19-2019, 12:52 PM   #59
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Quote:
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Turbo off job? Like rebuilding the turbo?
Like this. This vid is for the N54 models

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      08-17-2019, 11:25 AM   #60
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Has any rebuilt the turbo?

Does the b48 turbo fit the n20?

Or finally, is their any hybrid turbos?
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      10-14-2019, 02:22 PM   #61
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Turbo dynamics in the uk. Can do a wastegate rebuild for £200.
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      10-19-2019, 04:24 PM   #62
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I sold my 328 because of this

Disappointed that theres no official fix

Is it just on pre-lci cars?
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      10-20-2019, 04:19 PM   #63
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I sold my 328 because of this

Disappointed that theres no official fix

Is it just on pre-lci cars?
I wanted to sell mine but no one wanted it. I had £2k bill for timing chain and some other bits etc so decided to keep.
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      10-21-2019, 01:15 PM   #64
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Only fix that I see now is a new turbo with a modified wastegate. Then it will be bullet proof.
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