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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54 Turbos spooling excessively loud



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      11-08-2014, 06:09 PM   #1
aj555
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N54 Turbos spooling excessively loud

My car has been bone stock for a while, since I am selling it soon. For no reason the turbos started spooling up much louder at lower rpms. Basically what the turbos sounded like at 3500rpm before, is now like that at 1500rpm. There is no codes, and the cars feels the same. I tried searching, and could only find threads of people wanting their cars to sound louder. A friend who is a mechanic on track cars had checked out the turbos, and said they look find. Seals and fins were good. Anyone know what of possibly caused this, and how to fix it?
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      11-08-2014, 06:31 PM   #2
atinybug
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You can actually hear the turbos on a bone stock car? Are you sure it's the turbos and not a vacuum leak somewhere?
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      11-08-2014, 09:00 PM   #3
aj555
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Quote:
Originally Posted by atinybug View Post
You can actually hear the turbos on a bone stock car? Are you sure it's the turbos and not a vacuum leak somewhere?
Not very loudly, but yes once I had changed my mufflers I have been able to hear the turbos bone stock. A vacuum leak on top of that could be the cause though of the excessive noise. I looked around and the symptoms were similar, except others were getting a code thrown. I will check around tomorrow, and see what I can find.
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