Turbo whine / sirene after dp's

waikiki35 · 12-04-2014, 11:44 PM

Hey guys,
Just installed my dp's and took it for a ride. I'm getting s pretty loud turbo whine. Didn't whine at all before the install. Did I not install something right, maybe not clamped in right on the turbos ?
I had the same mods on my previous 335i but no whine at all...
It does it under 4000 rpm low load.. Not at wot.

N54 6MT 62k miles
Jb4 G5
E40 17 psi
Dci
DP's

Moutamid · 12-05-2014, 01:26 AM

I'm getting turbo whine but not immediatly after installing downpipes.
It took months with no whine or siren .
Now i have it.

Ilma · 12-05-2014, 10:10 AM

The stock downpipes are double walled.....so they dampen a lot of the mechanical noises that people start hearing when they install aftermarket downpipes....which are single wall construction.

It is pretty common to hear your turbos spooling (whine) at low throttle, low rpms (1500-2500 rpms) so unless it's really loud, consider it normal.

Some get the noise and some don't.....about 50/50.

If your turbos are holding their boost targets then they will be fine.

waikiki35 · 12-05-2014, 01:12 PM

Thanks. Was just worried since I didn't have that noise at all on my previous 335i

brewnami · 12-05-2014, 03:37 PM

Same this happened to me after installing my borla catback. That was in August, but everything seems to be running fine and logs look fine. It is annoying though.

12-04-2014, 11:44 PM	#1
waikiki35 Banned 10 Rep 53 Posts Drives: 335i Join Date: Mar 2013 Location: tn iTrader: (0)	Turbo whine / sirene after dp's Hey guys, Just installed my dp's and took it for a ride. I'm getting s pretty loud turbo whine. Didn't whine at all before the install. Did I not install something right, maybe not clamped in right on the turbos ? I had the same mods on my previous 335i but no whine at all... It does it under 4000 rpm low load.. Not at wot. N54 6MT 62k miles Jb4 G5 E40 17 psi Dci DP's
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12-05-2014, 01:26 AM	#2
Moutamid Captain 110 Rep 897 Posts Drives: AW E92 M3 Join Date: Jan 2012 Location: oman iTrader: (1)	I'm getting turbo whine but not immediatly after installing downpipes. It took months with no whine or siren . Now i have it.
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12-05-2014, 10:10 AM	#3
Ilma Colonel 193 Rep 2,854 Posts Drives: 2023 M4 Competition Join Date: Nov 2008 Location: Mississauga iTrader: (0)	The stock downpipes are double walled.....so they dampen a lot of the mechanical noises that people start hearing when they install aftermarket downpipes....which are single wall construction. It is pretty common to hear your turbos spooling (whine) at low throttle, low rpms (1500-2500 rpms) so unless it's really loud, consider it normal. Some get the noise and some don't.....about 50/50. If your turbos are holding their boost targets then they will be fine.
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12-05-2014, 01:12 PM	#4
waikiki35 Banned 10 Rep 53 Posts Drives: 335i Join Date: Mar 2013 Location: tn iTrader: (0)	Thanks. Was just worried since I didn't have that noise at all on my previous 335i
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12-05-2014, 03:37 PM	#5
brewnami Major 102 Rep 1,040 Posts Drives: 2009 BMW 335i M Sport Coupe Join Date: Aug 2013 Location: Boston, MA iTrader: (5)	Same this happened to me after installing my borla catback. That was in August, but everything seems to be running fine and logs look fine. It is annoying though. __________________ 2009 335i M Sport coupe, BSM with black/aluminum interior, 6MT, JB4 G5, MDH Backend Flash, Walbro 255 inline LPFP, VRSF Inlets, BMS 3" catless DP's, Borla Aggressive catback, ER FMIC, ER charge pipe, Tial BOV, BMS 2.3 gal Meth Kit, BMS Sport Oil Cooler Valve, Ported CDV, RB PCV, Cyba ram air scoops, Status Gruppe SRS coilovers, ECS trailing arms, Forgestar F14 SDC.
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