Weird trumpetting noise

utkarsh436 · 07-30-2018, 06:58 PM

I have a 2009 335i m/t and im hearing a really weird noise under WOT. It almost sounds like a deflating balloon/an elephant trumpeting and its driving me nuts. I do have a vrsf cp and BOV with an upgraded 7in fmic from vrsf as well as jb4 stage1 on the car currently.

Any help with where this noise may be coming from would be really helpful Thanks!

Blown95ImpalaSS · 07-31-2018, 12:33 PM

Typically the trumpet sound is a boost leak. Gotta check all the clamps on the intercooler, charge pipe etc. If you are stuck a leak or smoke test will help you figure out what needs tightening or replacing

e90yyc · 07-31-2018, 12:51 PM

Have you eaten at PF Chang's in the past 24 hours?

NoGuru · 07-31-2018, 12:58 PM

Quote:

Originally Posted by e90yyc

Have you eaten at PF Chang's in the past 24 hours?

utkarsh436 · 07-31-2018, 10:20 PM

Gotcha so I guess that’s probably why I’m way under target boost. During my 3rd gear pull I was almost off by 3-5 psi. Also my IAT was at like 136 even thought the outside temp was like 77 degrees. Would a boost leak explain the high iat values

NoGuru · 08-01-2018, 06:29 AM

Quote:

Originally Posted by utkarsh436

Gotcha so I guess that’s probably why I’m way under target boost. During my 3rd gear pull I was almost off by 3-5 psi. Also my IAT was at like 136 even thought the outside temp was like 77 degrees. Would a boost leak explain the high iat values

Yes, it could affect IAT's because of inefficiency.

bilbobagends · 02-22-2024, 08:29 PM

Quote:

Originally Posted by utkarsh436

Gotcha so I guess that’s probably why I’m way under target boost. During my 3rd gear pull I was almost off by 3-5 psi. Also my IAT was at like 136 even thought the outside temp was like 77 degrees. Would a boost leak explain the high iat values

what ultimatley ended up causing the leak? Im going through something similar with an identical sound

NoGuru · 03-15-2024, 07:32 AM

Quote:

Originally Posted by bilbobagends

what ultimatley ended up causing the leak? Im going through something similar with an identical sound

It's a boost leak. You might not see it from just visual inspection because some of them happen at a certain PSI.

07-30-2018, 06:58 PM	#1
utkarsh436 New Member 2 Rep 8 Posts Drives: 335i e92 manual Join Date: Apr 2018 Location: NJ iTrader: (0)	Weird trumpetting noise I have a 2009 335i m/t and im hearing a really weird noise under WOT. It almost sounds like a deflating balloon/an elephant trumpeting and its driving me nuts. I do have a vrsf cp and BOV with an upgraded 7in fmic from vrsf as well as jb4 stage1 on the car currently. Any help with where this noise may be coming from would be really helpful Thanks!
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07-31-2018, 12:33 PM	#2
Blown95ImpalaSS First Lieutenant 72 Rep 365 Posts Drives: s54 e36 m3/4/5 Join Date: Mar 2015 Location: Los Angeles iTrader: (5)	Typically the trumpet sound is a boost leak. Gotta check all the clamps on the intercooler, charge pipe etc. If you are stuck a leak or smoke test will help you figure out what needs tightening or replacing
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07-31-2018, 12:51 PM	#3
e90yyc Art Collector 2425 Rep 3,448 Posts Drives: 2007 328xi (GM-delete 6MT) Join Date: Feb 2018 Location: Canada iTrader: (0)	Have you eaten at PF Chang's in the past 24 hours?
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07-31-2018, 10:20 PM	#5
utkarsh436 New Member 2 Rep 8 Posts Drives: 335i e92 manual Join Date: Apr 2018 Location: NJ iTrader: (0)	Gotcha so I guess that’s probably why I’m way under target boost. During my 3rd gear pull I was almost off by 3-5 psi. Also my IAT was at like 136 even thought the outside temp was like 77 degrees. Would a boost leak explain the high iat values
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