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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Boost letoff woosh is gone



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      04-03-2013, 11:52 PM   #1
turugara
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2011 BMW 335i  [4.72]
Boost letoff woosh is gone

When you guys go full throttle and let off quickly, you usually hear a hiss sound which is the diverter valve letting the pressure back into the intake right?

I use to hear it all the time. Now it's gone.

What could be the cause of this?
I'm still hitting ~18psi of boost with the JB4 + Meth. Only when I let off from full throttle, I hear the sounds of the turbo spooling down quickly instead of the hiss of the diverter valve.

Ideas?
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      04-04-2013, 12:12 AM   #2
kkakonn
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I had a similar issue. It wasn't like the sound was completely gone it just wasnt has pronounced. Sometimes you wouldn't hear it at all and sometimes it was very faint. Mine was due to the charge pipe coming loose. Not sure if its the same with yours. Good luck!
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      04-11-2013, 12:20 PM   #3
Bobby_Sardells
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need to clean/replace your air filter
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      04-11-2013, 02:57 PM   #4
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Need to sell your car and donate all aftermarket parts to me before selling.

That's just what the word on the streets is.....
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      04-11-2013, 03:33 PM   #5
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Quote:
Originally Posted by badblk335i View Post
Need to sell your car and donate all aftermarket parts to me before selling.

That's just what the word on the streets is.....
Dibs on the brakes.
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