Whistling noise when in boost?

natedog7700 · 08-11-2018, 04:08 PM

Any idea what could cause this whistling noise? Its pretty loud at times and i checked the basic vacuum lines, inlets/outets. You can really hear it around 25 seconds or so.

mifesto · 08-17-2018, 08:39 AM

sounds like a bad boost leak to me

OlliD · 08-20-2018, 07:03 AM

When I changed my chargepipe it sounded exact same - in my case I didn´t tighten the bols enough so that little boost could excape. Check if chargepipe is broken and no loosey couplers etc.

Cabdriver · 08-22-2018, 09:15 PM

Boost leak imo. Check to see that the chargepipe is properly seated on the tb. If that's not it, continue checking down the line....it doesnt seem like a complete leak as your diverters are still chirping. So its containing some boost but the turbos sound overworked. Take it easy on the throttle till the issue is found.

My two cents.

08-11-2018, 04:08 PM	#1
natedog7700 Captain 657 Rep 780 Posts Drives: 07 335i RB's 625whp Join Date: Nov 2013 Location: milwaukee wi iTrader: (0)	Whistling noise when in boost? Any idea what could cause this whistling noise? Its pretty loud at times and i checked the basic vacuum lines, inlets/outets. You can really hear it around 25 seconds or so.
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08-17-2018, 08:39 AM	#2
mifesto Private First Class 26 Rep 141 Posts Drives: 2008 335xi Join Date: Aug 2016 Location: nj iTrader: (1)	sounds like a bad boost leak to me
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08-20-2018, 07:03 AM	#3
OlliD Private 29 Rep 53 Posts Drives: E92 335i Join Date: Oct 2016 Location: Germany iTrader: (0)	When I changed my chargepipe it sounded exact same - in my case I didn´t tighten the bols enough so that little boost could excape. Check if chargepipe is broken and no loosey couplers etc. __________________ Mods: MHD Stage I, xHP, VRSF 3" Chargepipe, Turbosmart DV, VRSF DCI, Golf Tee Mod
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08-22-2018, 09:15 PM	#4
Cabdriver Private First Class 52 Rep 164 Posts Drives: 2009 E90 335i Join Date: Jun 2016 Location: NJ iTrader: (0)	Boost leak imo. Check to see that the chargepipe is properly seated on the tb. If that's not it, continue checking down the line....it doesnt seem like a complete leak as your diverters are still chirping. So its containing some boost but the turbos sound overworked. Take it easy on the throttle till the issue is found. My two cents.
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