BMW 135i annoying whistle from engine

135i_N54_GUY · 04-26-2014, 04:01 AM

Just recently I noticed a whizzing whistle sound while in drive so I decided to open the bonnet and check what it is but I can't seem to understand the cause... Anyone have any ideas what this whistle may be?

[u2b]

[/u2b]

Sylon · 04-26-2014, 10:33 AM

Turbo spool??? I'm not really hearing it in the video, sorry.

motorchimp · 04-29-2014, 09:05 AM

Turbo spool is also all I could hear. You hear the turbo slow down with a slight delay on the engine rpms.
My 9 yr old daughter heard mine spooling up the other morning and asked why our car sounded like when an airplane is taking off

edit: Actually, come to think of it, if you had a 2 series you'd likely be hearing that sound through your speakers too.

new2the3 · 04-29-2014, 10:15 AM

On decell it does sound a little strange

135i_N54_GUY · 04-29-2014, 10:18 AM

That's it! on deceleration it sounds like there is a whistling sound... Been to the dealer and they say it's normal but I'm not fully convinced. What do you think this is?

135i_N54_GUY · 04-29-2014, 01:20 PM

Quote:

Originally Posted by motorchimp

Turbo spool is also all I could hear. You hear the turbo slow down with a slight delay on the engine rpms.
My 9 yr old daughter heard mine spooling up the other morning and asked why our car sounded like when an airplane is taking off

edit: Actually, come to think of it, if you had a 2 series you'd likely be hearing that sound through your speakers too.

All I can say is "twin turbo"... And the car is a classic :-)

darkrom · 04-29-2014, 01:30 PM

Sounds normal to me. check for a minor boost leak at best.

motorchimp · 04-29-2014, 02:12 PM

Quote:

Originally Posted by 135i_N54_GUY

All I can say is "twin turbo"... And the car is a classic :-)

Yep. Started reading on the history of Turbos and learned about Twin Scroll turbos today. Pretty nifty stuff.

FYI

http://en.wikipedia.org/wiki/Turbocharger

135i_N54_GUY · 04-29-2014, 04:24 PM

Quote:

Originally Posted by motorchimp

Quote:

Originally Posted by 135i_N54_GUY

All I can say is "twin turbo"... And the car is a classic :-)

Yep. Started reading on the history of Turbos and learned about Twin Scroll turbos today. Pretty nifty stuff.

FYI

http://en.wikipedia.org/wiki/Turbocharger

Read the article and it's really awesome... I really enjoyed this part of the article though:

http://en.m.wikipedia.org/wiki/Twincharger

04-26-2014, 04:01 AM	#1
135i_N54_GUY New Member 2 Rep 28 Posts Drives: BMW 135i M Performance Join Date: Apr 2014 Location: South Africa iTrader: (0)	BMW 135i annoying whistle from engine Just recently I noticed a whizzing whistle sound while in drive so I decided to open the bonnet and check what it is but I can't seem to understand the cause... Anyone have any ideas what this whistle may be? [u2b] [/u2b]
	Appreciate 0 Tweet Quote

04-26-2014, 10:33 AM	#2
Sylon Brigadier General 189 Rep 3,435 Posts Drives: 2011 135i, SG/CR, 6MT, M-Sport Join Date: Apr 2010 Location: Michigan / Ohio iTrader: (0) Garage List 2011 135i [9.20]	Turbo spool??? I'm not really hearing it in the video, sorry. __________________ 2011 BMW 135i \| Space Gray \| ///M-Sport \| BMW CCA #450291 Facebook / Instagram / YouTube / Twitter
	Appreciate 0 Quote

04-29-2014, 09:05 AM	#3
motorchimp I have Brimbo's 11 Rep 221 Posts Drives: 135is, X3 Join Date: Jan 2014 Location: United States iTrader: (2)	Turbo spool is also all I could hear. You hear the turbo slow down with a slight delay on the engine rpms. My 9 yr old daughter heard mine spooling up the other morning and asked why our car sounded like when an airplane is taking off edit: Actually, come to think of it, if you had a 2 series you'd likely be hearing that sound through your speakers too. Last edited by motorchimp; 04-29-2014 at 09:25 AM..
	Appreciate 0 Quote

04-29-2014, 10:15 AM	#4
new2the3 Colonel 378 Rep 2,067 Posts Drives: 2020 X3M Competition Join Date: Jun 2006 Location: San Diego iTrader: (0)	On decell it does sound a little strange __________________ 2020 X3MC 2009 135i: AW/CR Aluminum Trim, 6 speed, M-Sport, Premium, Heated Seats, Ipod, BMW Performance Pedals, BMW Performance SSK, BMW Performance Exhaust, BMW Performance Grills E93 M3 FSB
	Appreciate 0 Quote

04-29-2014, 10:18 AM	#5
135i_N54_GUY New Member 2 Rep 28 Posts Drives: BMW 135i M Performance Join Date: Apr 2014 Location: South Africa iTrader: (0)	That's it! on deceleration it sounds like there is a whistling sound... Been to the dealer and they say it's normal but I'm not fully convinced. What do you think this is?
	Appreciate 0 Quote

04-29-2014, 01:30 PM	#7
darkrom Colonel 188 Rep 2,224 Posts Drives: 135i Join Date: Feb 2011 Location: Rhode Island iTrader: (5)	Sounds normal to me. check for a minor boost leak at best.
	Appreciate 0 Quote