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      05-06-2021, 09:50 AM   #8
carsforlife
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Drives: 2013 335i
Join Date: Mar 2020
Location: Beirut

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Quote:
Originally Posted by thejeremyman9 View Post
Our car is frankly not setup to produce that sound. This isnt a big turbo tuner car from the 90s. The N55 setup is to vent the pressure post-turbo back pre-turbo without venting anything to the atmosphere. Getting an aftermarket intake makes this recirculation sound "whoosh" louder. Alternatively you can get a VTA DV that dumps the air to the atmosphere instead of recirculating it, but its still just dumping air.

The sound you are talking about happens with no BOV or DV because the high pressure air post-turbo surges back through the turbo when the throttle shuts and it has nowhere else to go. Bad for performance and the turbo; hence why the N55 does not do it.
Ehhh I see thank you a lot
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