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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning ? 2015 Wastegate Rattle ?

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      10-09-2014, 09:54 PM   #1
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? 2015 Wastegate Rattle ?

Hey guys, searched the site but to no avail. I just picked up my 2015 M235i a couple weeks ago. I have noticed the exact same sound coming out of my wastegate that my old 07 335i had. Should it even be able to do this with the new electronically operated wastgates? Disappointed to say the least, it happens at really low rpms/blipping the throttle in neutral. I absolutely won't be able to justify buying a $53 k new car with mp LSD rattling like a POS. Any ideas/same experiences out there before I raise hell at the dealership tomorrow?
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      10-10-2014, 07:09 PM   #2
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Really.... Not even a slight rattle on any of the 2014's out there? Begining to think I may have an isolated issue.
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      10-10-2014, 08:37 PM   #3
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I've read a lot on these forums...and this is the first I've heard of the issue
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      10-11-2014, 12:14 PM   #4
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Do you have a sound recording or video of such issue?
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      11-01-2014, 07:54 PM   #5
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I had an 08 335i E90 with all the waste gates problems known to man!

The M235 has none of these issues
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      12-14-2014, 08:40 PM   #6
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Quote:
Originally Posted by TwinsRnice View Post
Hey guys, searched the site but to no avail. I just picked up my 2015 M235i a couple weeks ago. I have noticed the exact same sound coming out of my wastegate that my old 07 335i had. Should it even be able to do this with the new electronically operated wastgates? Disappointed to say the least, it happens at really low rpms/blipping the throttle in neutral. I absolutely won't be able to justify buying a $53 k new car with mp LSD rattling like a POS. Any ideas/same experiences out there before I raise hell at the dealership tomorrow?
Holy crap, my 15 M235i just starting having this problem today, the cold start up rattle is unbearable, this is performance exhaust too. Was your problem resolved?
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      05-31-2015, 07:01 PM   #7
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Hmm, I wonder if this is what I'm hearing. I started hearing something a few weeks ago. Not sure if I just didn't notice it before because it's not loud and really not noticeable if I have the radio up.

I have the ZF8 auto trans and when accelerating in gear 2 and let off the gas is when I hear this sound/rattle/vibration. I don't hear it if the car is parked and I rev the engine.

Is this something I should have the dealer look at?
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      06-02-2015, 09:26 AM   #8
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The wastegate rattle can happen on the m235i. My m135i 8AT has it annoyingly but note enough for the dealer to replace the turbo or for any performance to be lost.

Symptoms:

1. Initially just happened on cold start then it would stop.

2. Now lasts until the car is fully up to temperature.

3. Rattle is most prominent around 2000rpm.

There has been a couple of cases over here in the UK where wastegate rattle was declared as the problem and the turbo was replaced under warranty.

I'm keeping an eye on it to see if it gets any worse, wether that's the noise or performance.

Hope that helps.
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      06-02-2015, 04:59 PM   #9
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Sorry, I already posted this video on the general forum but i should have posted this here in the first place..

at 3:15 you can hear some sort of rattle noise at the end of the rev. Is that the wastegate rattle?

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      06-02-2015, 11:49 PM   #10
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You can hear it better in this video. I think its the wastegate rattle

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      06-03-2015, 12:19 AM   #11
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Quote:
Originally Posted by JSY217c
Sorry, I already posted this video on the general forum but i should have posted this here in the first place..

at 3:15 you can hear some sort of rattle noise at the end of the rev. Is that the wastegate rattle?

No. Since he took off the engine cover with the sound deadener so you're hearing the direct injection pump that are insane loud and rattly is the perfect sound to describe them.
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      06-03-2015, 08:46 AM   #12
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Quote:
Originally Posted by dd1981 View Post
No. Since he took off the engine cover with the sound deadener so you're hearing the direct injection pump that are insane loud and rattly is the perfect sound to describe them.
Do you know what all the rattle is on the 2nd video i posted? Sorry I'm just getting paranoid cause the car I own at the moment rattles like crazy and I just don't want to experience it again.
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      06-03-2015, 10:37 AM   #13
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Quote:
Originally Posted by JSY217c
Quote:
Originally Posted by dd1981 View Post
No. Since he took off the engine cover with the sound deadener so you're hearing the direct injection pump that are insane loud and rattly is the perfect sound to describe them.
Do you know what all the rattle is on the 2nd video i posted? Sorry I'm just getting paranoid cause the car I own at the moment rattles like crazy and I just don't want to experience it again.
It's very faint, not sure exactly. These new exhausts sound very funny and loud upon startup. My flap opens every time it's so loud.

I cannot say I've heard of these new N55 motors having issues (not impossible) but I can say that I had a bad waste gate gasket on my 2012 f30 335i. It was a sort of humming sound once the car warmed up. Dealer replaced it in under and hour and it's all they told me. Not sure how common it is.
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      06-03-2015, 11:30 AM   #14
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Quote:
Originally Posted by dd1981 View Post
It's very faint, not sure exactly. These new exhausts sound very funny and loud upon startup. My flap opens every time it's so loud.

I cannot say I've heard of these new N55 motors having issues (not impossible) but I can say that I had a bad waste gate gasket on my 2012 f30 335i. It was a sort of humming sound once the car warmed up. Dealer replaced it in under and hour and it's all they told me. Not sure how common it is.
I went to the dealership to test drive the car again and definitely noticed a bit of rattle during rev at neutral. But it was very faint. Almost unnoticeable unless you specifically focused on the rattle. Didn't notice any when I was driving possibly because of the road noise. The test car had 11000km on it and the engine was broken in long time ago so I'm hoping the rattle doesn't get any worse.
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      06-03-2015, 01:31 PM   #15
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I didn't notice wastegate rattle at all when my car had bone stock exhaust but it appeared immediately after I installed my catless DP. The rattle is actually so bad that I'm contemplating on re-installing the stock DP or switch it out for a sport cat.

-Nick
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      06-03-2015, 01:44 PM   #16
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Quote:
Originally Posted by e46m3to335i View Post
I didn't notice wastegate rattle at all when my car had bone stock exhaust but it appeared immediately after I installed my catless DP. The rattle is actually so bad that I'm contemplating on re-installing the stock DP or switch it out for a sport cat.

-Nick
I guess the DP amplifies the rattle? How long did you keep the stock for?
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      06-03-2015, 03:08 PM   #17
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Quote:
Originally Posted by JSY217c View Post
I guess the DP amplifies the rattle? How long did you keep the stock for?
My car was only stock for about 200 miles before I threw a tune and DP on it.
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      06-24-2015, 07:56 AM   #18
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My 2015 M235i xdrive rattles at start up sometimes and it's very loud. I have no idea what it is but it sounds like it's coming from under the car. It only happens sometimes.
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      07-13-2015, 12:21 PM   #19
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Quote:
Originally Posted by Lgoltry View Post
My 2015 M235i xdrive rattles at start up sometimes and it's very loud. I have no idea what it is but it sounds like it's coming from under the car. It only happens sometimes.
It may be a malfunctioning exhaust flap. That's the issue I had recently with my 2015 M235xi. The dealership had it fixed in 1 day. Repair Cost and car rental: $0.00

Good as new.
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      07-13-2015, 02:13 PM   #20
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Quote:
Originally Posted by haffl View Post
It may be a malfunctioning exhaust flap. That's the issue I had recently with my 2015 M235xi. The dealership had it fixed in 1 day. Repair Cost and car rental: $0.00

Good as new.
Thanks, I'll have them look at it.
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      07-13-2015, 06:08 PM   #21
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Quote:
Originally Posted by haffl View Post
It may be a malfunctioning exhaust flap. That's the issue I had recently with my 2015 M235xi. The dealership had it fixed in 1 day. Repair Cost and car rental: $0.00

Good as new.
Had this exact same issue. It was the malfunctioning exhaust valve flap. It rattled like crazy on cold start, and blips. I fixed it in 2 seconds by unplugging the exhaust valve connector when the car was warm and in sport mode so that the exhaust valve stays open ALWAYS now. Love how it sounds when it is always open and no more rattle!
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      08-15-2015, 12:14 PM   #22
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Question 2015 M235i - Sluggish Wastegate ?

I'm growing concerned, I have a 2015 M235i X Drive with only 1500 miles.

I got the Sluggish Wastegate code - 123511 - Twice
On both occasions the error hit after decelerating following a "sprint" of 80 MPH.

Pulled over shut off the engine and restarted. Error Cleared and car ran normally. Any thoughts or ideas ?
New car, bone stock, broken in gently... what is going ???
Car is only driven once a week for the last 8 months.


.

Last edited by JustMatt; 08-15-2015 at 05:46 PM..
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