[mallorca328]

update on https://f30.bimmerpost.com/forums/sh...8&postcount=22


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Hey guys, i wanted to show you a video of my new remus exhaust on my 328.

But at the same time, maybe you could help me.

Mostly when the car is cold and i turn it on, i hear this rattle for a while... maybe you have an idea of what it could be?

You can barely notice it if you watch the video on a phone, sounds better on desktop speakers

The rattle starts at 0:06 and at 0:19 you can notice how it fades out

Ive had it for a long time already before i installed the exhaust.

[rjd_F30]

Video is showing unavailable.

[mallorca328]

Originally Posted by rjdnyy224

Video is showing unavailable.

Fixed!

[rjd_F30]

Originally Posted by mallorca328

Fixed!

Sounds really good! Not sure what the rattle could be but sounds like it's coming from up front, maybe try and get a video from under the hood? Could just be the normal injector noise from what it sounds like in that video.

[CandyRedRC46]

Exhaust sounds great, I cant hear any rattle, maybe you should move the mic away from exhaust outlets and more towards the center of car (closer to possible source of rattle).

[mallorca328]

Ok ill do center and engine recordings

[RMachuca3d]

I think it has to do with the warm up procedure the engine goes through, not to worry, mine does it too.

[fiveohwblow]

Originally Posted by RMachuca3d

I think it has to do with the warm up procedure the engine goes through, not to worry, mine does it too.

I too have the same rattle which is annoyingly similar in sound to a wastegate rattle of the n54

[7iM3less]

To be specific the rattle is most likely the actuator on your turbo. Over time it weathers, rusts and starts to rattle.

Its normal, although if you have warranty still you may be able to have it replaced. I had my entire turbo replaced on warranty for the same problem.

My cars quiet as a whistle now.

[CandyRedRC46]

My exhaust was rattling pretty bad and it went away after upgrading the entire exhaust. I did not touch the turbo actuator (wastegate?). I am assuming my rattle was either the factory down pipe to catback clamp or the muffler flap, but I haven't heard it since upgrading the downpipe/frontpipe/muffler....

[mallorca328]

Originally Posted by KC328_F30

To be specific the rattle is most likely the actuator on your turbo. Over time it weathers, rusts and starts to rattle.

Its normal, although if you have warranty still you may be able to have it replaced. I had my entire turbo replaced on warranty for the same problem.

My cars quiet as a whistle now.

Do you really have to replace the whole turbo? I got a new one 9 months ago

Originally Posted by CandyRedRC46

My exhaust was rattling pretty bad and it went away after upgrading the entire exhaust. I did not touch the turbo actuator (wastegate?). I am assuming my rattle was either the factory down pipe to catback clamp or the muffler flap, but I haven't heard it since upgrading the downpipe/frontpipe/muffler....

I had it already before installing the new exhaust.

[mallorca328]

update: noise seems to come from under the car, not from the engine

[rjd_F30]

Originally Posted by mallorca328

update: noise seems to come from under the car, not from the engine

Exhaust flap? I would think it would be heard more clearly in the video if that was it but worth checking. Other than, I would make sure all the screws for all the exhaust clamps from the DP to the muffler are secure.

[mallorca328]

Originally Posted by rjdnyy224

Exhaust flap? I would think it would be heard more clearly in the video if that was it but worth checking. Other than, I would make sure all the screws for all the exhaust clamps from the DP to the muffler are secure.

I have a remus exhaust, theres no flap...

And its not related with the installation of the exhaust, as i said before i already had this problem with stock

[rjd_F30]

Originally Posted by mallorca328

I have a remus exhaust, theres no flap...

And its not related with the installation of the exhaust, as i said before i already had this problem with stock

Didn't know Remus wasn't valved, my bad! Also didn't pay attention to your mention of it happening stock, my bad 2! In that case, I would refer to the last part of my post, making sure that every clamp and it's fasteners are secured well.

[mallorca328]

Originally Posted by rjdnyy224

Didn't know Remus wasn't valved, my bad! Also didn't pay attention to your mention of it happening stock, my bad 2! In that case, I would refer to the last part of my post, making sure that every clamp and it's fasteners are secured well.

haha no probs.. actually the remus has a little tray where you are supposed to keep the servomotor (is this how you call it in english?) so its not just there hanging

Went to the mechanic today and we figured it comes from the bottom of the car but he was kinda busy and i have to wait until next tuesday or wednesday

[rjd_F30]

Originally Posted by mallorca328

haha no probs.. actually the remus has a little tray where you are supposed to keep the servomotor (is this how you call it in english?) so its not just there hanging

Went to the mechanic today and we figured it comes from the bottom of the car but he was kinda busy and i have to wait until next tuesday or wednesday

Flap actuator, servomotor, I know what you mean

Hopefully it gets sorted when the mechanic gets a chance to look at it.

[kobluna]

Originally Posted by mallorca328

haha no probs.. actually the remus has a little tray where you are supposed to keep the servomotor (is this how you call it in english?) so its not just there hanging

Went to the mechanic today and we figured it comes from the bottom of the car but he was kinda busy and i have to wait until next tuesday or wednesday

I'm also interested on this as I have very bad cold start rattle. It sounds like it comes under the car but hard to say really. Might as well be turbo or its actuator.

I have 320i so I don't have exhaust flap either. Car is stock but of course there might be some clamp in the exhaust that has got loose.

[ilivas]

Mine rattle really bad for awhile. One of the hangers broke off so I had to have it rewelded. I have a Remus as well.

[mallorca328]

Originally Posted by kobluna

I'm also interested on this as I have very bad cold start rattle. It sounds like it comes under the car but hard to say really. Might as well be turbo or its actuator.

I have 320i so I don't have exhaust flap either. Car is stock but of course there might be some clamp in the exhaust that has got loose.

Just found out this morning.

I was up on the lift stepping on the pedal every time he told me to do so, he kept checking that everything was fine.
It seems it a piece of ceramic (or whatever material is used on this car model) loose inside the cat, he told me theres nothing to worry about.


The options are:

1) tiny chance that it goes away on its own some day
2) waste money on a new cat
3) live with it

so i guess ill have to ignore it

[kobluna]

Originally Posted by mallorca328

Just found out this morning.

I was up on the lift stepping on the pedal every time he told me to do so, he kept checking that everything was fine.
It seems it a piece of ceramic (or whatever material is used on this car model) loose inside the cat, he told me theres nothing to worry about.


The options are:

1) tiny chance that it goes away on its own some day
2) waste money on a new cat
3) live with it

so i guess ill have to ignore it

Thanks for the info. That could explain my rattle as well. Anyway I'll try to investigate if my rattle indeed comes inside of the cat.

[mallorca328]

Originally Posted by kobluna

Thanks for the info. That could explain my rattle as well. Anyway I'll try to investigate if my rattle indeed comes inside of the cat.

UPDATE: Went for a second check. It wasnt exactly the ceramics broken, but this flexible tube that is part of the whole cat (on the engine side)




For some reason its slightly "damaged" on the inside.

Its still not an issue and shouldnt give problems in a long time, i mean i can just leave it like that. The problem is they dont sell JUST this part, only the whole cat (at least OEM) so the only way to get rid of the noise would be going catless or replacing the cat.