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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 > Whoosh When Letting Off Accelerator



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      08-31-2012, 08:15 AM   #1
pits200
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Whoosh When Letting Off Accelerator

So I've been having issues and I hate to start a new thread but perhaps this will be relevant to someone else when using the search function.

So I quadruple checked all my fittings and vac lines on the cold side and when going for a drive I get no codes.

I can build a little boost, (Still have the boost issue and 30ff code) I'd say 5psi so when I am in boost and let off the gas peddle I hear a whoosh sound from the drivers side.

I have the cowl and filter off for now so I hear a lot more in the engine bay.(Those injectors are loud as hell) So is that whoosh the dvs? It's only when letting off the gas when in boost.

Any ideas?
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      08-31-2012, 08:18 AM   #2
Snertz
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Yep, that noise is coming from the DV's
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      08-31-2012, 08:19 AM   #3
BlackBB6
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With the cowl off the sound is much more pronounced.
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      08-31-2012, 08:32 AM   #4
pits200
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So that sound is typical then and doesn't indicate a leak in the dvs?

I've done a boost leak test at 15psi from the hot side of the IC over and the dvs didn't make a peep so I'm guessing they're ok.

They car seems to build the first 5psi of boost fine but when it tries going past that it throws the 30ff code.
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      08-31-2012, 09:11 AM   #5
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Are you hearing any sort of hiss or whoosh when you are building up to that 5 psi?
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      08-31-2012, 10:35 AM   #6
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Problem found!!!

My front actuator became disconnected from the wastegate..

I was essentially running on 1 turbo
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      08-31-2012, 06:39 PM   #7
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Wow how the hell does that happen?
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