[MonacoTT]

I've had a problem for a while now which has been very annoying. It's a buzzing sound with a freqency that correlates with engine RPM that can be heard the most during engine deceleration. It is most audible on deceleration from anywhere from redline to 1100 RPM.

I started a thread here: http://www.e90post.com/forums/showth...86#post1935786 and the consensus was that it seemed like some sort of exhaust issue (possibly a heat shield).

Turns out we were wrong...

Went to the dealer today, and they told me the problem is the wastegate on one of the turbos.

They are waiting for a response from engineering on the east coast, and may or may not replace both wastegates (He said even a possibility of replacing the turbos... Sounds like overkill to me, but hey, free new turbos sounds great).

Considering the fact that they are opening up the possibility to replace the entire turbo, I'm wondering if this issue is bigger than they are making it out to be. I guess we will see.

Has anyone had this problem before?

UPDATE: My car is having both turbos replaced at the dealer right now (wastegate is internal to the turbo, and they arn't sure which turbo is the culprit). Turns out there is an official bulletin on the issue.

[rwalker]

Originally Posted by MonacoTT

I've had a problem for a while now which has been very annoying. It's a buzzing sound with a freqency that correlates with engine RPM that can be heard the most during engine deceleration. It is most audible on deceleration from anywhere from redline to 1100 RPM.

I started a thread here: http://www.e90post.com/forums/showth...86#post1935786 and the consensus was that it seemed like some sort of exhaust issue (possibly a heat shield).

Turns out we were wrong...

Went to the dealer today, and they told me the problem is the wastegate on one of the turbos.

They are waiting for a response from engineering on the east coast, and may or may not replace both wastegates (He said even a possibility of replacing the turbos... Sounds like overkill to me, but hey, free new turbos sounds great).

Considering the fact that they are opening up the possibility to replace the entire turbo, I'm wondering if this issue is bigger than they are making it out to be. I guess we will see.

Has anyone had this problem before?

I have something similar, only I've only been able to hear it at fairly low RPMs. Is your sound almost like a growl?

-Rob

[Bubbles]

OP

Did you have any mods/tunes etc?

[mattnagano]

im having the same prob...but i can only hear mine at low rpm wen i get go of the gas...kinda sounds like a ticking or something...


matt

[hotrod2448]

I would say they most likely want to replace the entire turbo assembly not because of it being a bigger issue than they are letting on but, more so they can look at the entire assembly the way it came off the car and determine cause of failure.

[MonacoTT]

Originally Posted by mattnagano

im having the same prob...but i can only hear mine at low rpm wen i get go of the gas...kinda sounds like a ticking or something...


matt

Yeah, its like a ticking that is more rapid in freqency at higher RPMs. Imagine the sound of a baseball card in bicycle spokes, but with a more tin-like note.

It turns from a ticking into more of a buzzing at higher RPMs because of the high frequency.

I would record a sound file, but my car is stuck at the dealer.

I'll keep you guys posted.

[335iheLLraiseR]

i had that too, but it went away.

[turbotko]

It's a known issue and there is a BMW bulletin to support it.

[AWD Addict]

Originally Posted by turbotko

It's a known issue and there is a BMW bulletin to support it.

do you have a copy? I couldn't find it via search.

[HPIA4v2]

Originally Posted by MonacoTT

I've had a problem for a while now which has been very annoying. It's a buzzing sound with a freqency that correlates with engine RPM that can be heard the most during engine deceleration. It is most audible on deceleration from anywhere from redline to 1100 RPM.

I started a thread here: http://www.e90post.com/forums/showth...86#post1935786 and the consensus was that it seemed like some sort of exhaust issue (possibly a heat shield).

Turns out we were wrong...

Went to the dealer today, and they told me the problem is the wastegate on one of the turbos.

They are waiting for a response from engineering on the east coast, and may or may not replace both wastegates (He said even a possibility of replacing the turbos... Sounds like overkill to me, but hey, free new turbos sounds great).

Considering the fact that they are opening up the possibility to replace the entire turbo, I'm wondering if this issue is bigger than they are making it out to be. I guess we will see.

Has anyone had this problem before?

As long it's under waranty.

My A4 KO3 turbo developed this particular problem in 2nd year of ownership but dealer failed to dignosed it until after waranty was over.

The wastegate develop "slops" and won't close completely, so you are can't get consistent as well as loosing boost. It's metalic rattling sound during deceleration is right on.

Not sure if these Mitsubishi turbo has separate wastegate or integrated, if later then you are getting new turbo/s.

Good luck.

[hotrod2448]

I'm pretty sure they are internal wastegates.

[MonacoTT]

Great info guys! Man, I'm always blown away by the knowledgeability of the users on this forum.

If this problem is indeed causing a loss in boost, I wonder how much of a beast it will be once it's fixed (considering it's damn fast as is).

How rampant of a problem is this? Is there some sort of redesign (ala HPFP) in effect, or in the works?

[MonacoTT]

Just got back from the dealer.

They are replacing both turbos in the car.

[AWD Addict]

Originally Posted by hotrod2448

I'm pretty sure they are internal wastegates.

No they're not. you can see them in the pics. They're external, just like all common mitsubishi blowers.

[O-cha]

Originally Posted by AWD Addict

No they're not. you can see them in the pics. They're external, just like all common mitsubishi blowers.

I can't believe the things you say, first claiming an intercooler will melt your cats, now your telling people these are external wastegates.




Did you really ever tune a turbo car? Or was that boost controller you said you used that almost blew your motor the extent of your tuning?

[e46e92love]

Very interesting......

[hotrod2448]

Originally Posted by AWD Addict

No they're not. you can see them in the pics. They're external, just like all common mitsubishi blowers.

Really? I'm pretty sure my Evo had a Mitsu turbo on it and it was internally gated just like these are. In fact I don;t think I've ever seen an OEM street car application that had an external wastegate.

Maybe you should learn WTF you are talking about before you go spreading "knowledge".

[mattnagano]

so you guys think i should take my car in? man... i dont want to be carless for a week... sigh....

[hotrod2448]

Originally Posted by mattnagano

so you guys think i should take my car in? man... i dont want to be carless for a week... sigh....

loaner? I would think this would qualify for one.

[MonacoTT]

I got a PT Cruiser for rent... lol!

Thankfully I dropped it off at home and am flying to New York.

[Blue92]

External huh... someone needs to learn the difference between a wastegate actuator and the wastegate itself.

[O-cha]

Originally Posted by Blue92

External huh... someone needs to learn the difference between a wastegate actuator and the wastegate itself.

Yea that's what I was thinking he might have meant, but I didn't want to give him the option to save face because, well, I'm a douch.