E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Spooling sound



Reply
 
Thread Tools Search this Thread
      05-26-2013, 09:00 PM   #1
Rupes
Captain
Rupes's Avatar
United_States
22
Rep
843
Posts

 
Drives: 2011 E92 M3
Join Date: Apr 2013
Location: Ohio

iTrader: (0)

Spooling sound

I know this thread doesn't deliver without a video, but I'm wondering if anyone else's 328i (naturally aspirated) makes a spooling down type sound when shifting slowly at a high RPM. What the hell is that? For example, take the car to 7k RPM, hit the clutch, wait a second to shift and I hear vuuuu. It's not the engine sound though. Flywheel maybe? I just want to know others have it too I guess.
Appreciate 0
      05-26-2013, 09:33 PM   #2
Eagle1oh7
Captain
Eagle1oh7's Avatar
United_States
8
Rep
717
Posts

 
Drives: '11 328i Sedan
Join Date: Oct 2012
Location: Chula Vista CA

iTrader: (0)

Intake sound.
__________________
DONE: Seibon CF Hood, M3 Rep, MSport rear w/Duke Dynamics CF Diffuser, M3 Rep Skirts, aFe Stage 2 PRO-R Intake, Seibon CSL trunklid, Forgestar F14 18s w/Michelin PSS

FUTURE MODS: Eisenmann Full Cat-back Exhaust, OETuning ECU, AA Headers, CF mirror caps, Bi-Xenon headlights, CF rooftop, CF lip
Appreciate 0
      05-26-2013, 10:14 PM   #3
Rupes
Captain
Rupes's Avatar
United_States
22
Rep
843
Posts

 
Drives: 2011 E92 M3
Join Date: Apr 2013
Location: Ohio

iTrader: (0)

Quote:
Originally Posted by Eagle1oh7 View Post
Intake sound.
Your right, thanks. /thread
Appreciate 0
      05-28-2013, 12:11 AM   #4
Light_Em_Up
Member
Canada
1
Rep
38
Posts

 
Drives: 128is
Join Date: May 2009
Location: N. Vancouver, BC

iTrader: (0)

Spooling Sound

My 2009 128 has made the sound as you describe since new and I have always wondered what it is. I have changed my intake and my manifold to a 3 stage without any perceptible change in this sound so I'm questioning whether it is intake. It sounds to me like a 20k+ rpm gear set or turbine winding down. What else could it be?
__________________
'09 128i 6Sp Man Sport (263 18" wheels), Space Grey / Coral Red leather, BMW Perf Intake, Exhaust & Suspension, 3-Stage Manifold, AA Ver 2 tune, Carbon Filter & CDV Delete, Yoko S-Drives
Appreciate 0
      05-28-2013, 01:09 AM   #5
Eagle1oh7
Captain
Eagle1oh7's Avatar
United_States
8
Rep
717
Posts

 
Drives: '11 328i Sedan
Join Date: Oct 2012
Location: Chula Vista CA

iTrader: (0)

Quote:
Originally Posted by Light_Em_Up View Post
My 2009 128 has made the sound as you describe since new and I have always wondered what it is. I have changed my intake and my manifold to a 3 stage without any perceptible change in this sound so I'm questioning whether it is intake. It sounds to me like a 20k+ rpm gear set or turbine winding down. What else could it be?
All I know is that it sounds lovely.
__________________
DONE: Seibon CF Hood, M3 Rep, MSport rear w/Duke Dynamics CF Diffuser, M3 Rep Skirts, aFe Stage 2 PRO-R Intake, Seibon CSL trunklid, Forgestar F14 18s w/Michelin PSS

FUTURE MODS: Eisenmann Full Cat-back Exhaust, OETuning ECU, AA Headers, CF mirror caps, Bi-Xenon headlights, CF rooftop, CF lip
Appreciate 0
      05-28-2013, 08:40 AM   #6
BoogeyMan'sBMW
Major
BoogeyMan'sBMW's Avatar
Bangladesh
18
Rep
1,380
Posts

 
Drives: SLOW
Join Date: Jun 2009
Location: Queens NY

iTrader: (3)

I think it is the twin turbos spooling
Appreciate 0
      05-28-2013, 08:54 AM   #7
Rupes
Captain
Rupes's Avatar
United_States
22
Rep
843
Posts

 
Drives: 2011 E92 M3
Join Date: Apr 2013
Location: Ohio

iTrader: (0)

Quote:
Originally Posted by BoogeyMan'sBMW View Post
I think it is the twin turbos spooling
The engine is naturally aspirated, I think it must be the intake.
Appreciate 0
      05-28-2013, 09:03 AM   #8
BoogeyMan'sBMW
Major
BoogeyMan'sBMW's Avatar
Bangladesh
18
Rep
1,380
Posts

 
Drives: SLOW
Join Date: Jun 2009
Location: Queens NY

iTrader: (3)

Quote:
Originally Posted by Rupes View Post
The engine is naturally aspirated, I think it must be the intake.
Haha , i know brotha man i was just kidding. It is the intake, and if you and I are thinking about the same sound its when you get the car up to high RPMs and dont shift, just wait for it to come back down slowly, right?
Appreciate 0
      05-28-2013, 09:30 AM   #9
Rupes
Captain
Rupes's Avatar
United_States
22
Rep
843
Posts

 
Drives: 2011 E92 M3
Join Date: Apr 2013
Location: Ohio

iTrader: (0)

Quote:
Originally Posted by BoogeyMan'sBMW View Post
Haha , i know brotha man i was just kidding. It is the intake, and if you and I are thinking about the same sound its when you get the car up to high RPMs and dont shift, just wait for it to come back down slowly, right?
yea, sort of. But the clutch is engaged so the engine is dropping quickly but the "spooling sound" lingers.
Appreciate 0
      05-28-2013, 10:43 AM   #10
SDemetris
FSAE Dude
5
Rep
474
Posts

 
Drives: E90 328xi
Join Date: Jul 2012
Location: Pittsburgh, PA

iTrader: (0)

I think it might be the alternator is just loud. I noticed it on my car.. it sounds like sound thing with square cut gears spinning very fast. the only thing i can think of is the alternator since our belts dont drive much else
__________________
2007 Titanium Silver 328xi: FBO - headers. Upgraded suspension and brakes.

1985 Gazelle Beige 325e: Nursing it back to health from PO negligence.. Soon to be track car.
Appreciate 0
      05-29-2013, 06:54 AM   #11
Surly73
Captain
Canada
10
Rep
724
Posts

 
Drives: 2007 E90 328i 6MT sport/prem
Join Date: May 2012
Location: Oakville, Ontario

iTrader: (0)

Quote:
Originally Posted by Rupes View Post
yea, sort of. But the clutch is engaged so the engine is dropping quickly but the "spooling sound" lingers.
Alternator overrun, probably. Recall these cars have a one way bearing (like a bicycle) on the alternator.
Appreciate 0
      05-29-2013, 09:13 AM   #12
WOT Bimmer
Lieutenant
7
Rep
527
Posts

 
Drives: BMW
Join Date: Jan 2013
Location: Ohio

iTrader: (1)

I notice this same sound on my '07 AT (steptronic). If I am in M1 and bring the RPMs up to the 5-6k+ range, it make a spooling/ziiiiiiinnnnng sound, especially if you bring it up to 5-6k+ and then let off the gas.
Appreciate 0
      05-29-2013, 10:07 AM   #13
Dylanize
Captain Dutch Rudder
Dylanize's Avatar
16
Rep
1,569
Posts

 
Drives: 07' E92
Join Date: Jan 2013
Location: Queen City, NC

iTrader: (4)

It's the vanos system doing its thing. Not the intake.
__________________

| Platinum Bronze Metallic | AA | VMR | ACS | DJApex Eurobox |
Appreciate 0
      05-29-2013, 01:00 PM   #14
Rupes
Captain
Rupes's Avatar
United_States
22
Rep
843
Posts

 
Drives: 2011 E92 M3
Join Date: Apr 2013
Location: Ohio

iTrader: (0)

Quote:
Originally Posted by Surly73 View Post
Alternator overrun, probably. Recall these cars have a one way bearing (like a bicycle) on the alternator.
Is alternator overrun bad? I now have three very different answers - I preferred the intake answer the best, heh. Maybe that means it's time to post a clip of the sound.
Appreciate 0
      05-30-2013, 07:02 AM   #15
Surly73
Captain
Canada
10
Rep
724
Posts

 
Drives: 2007 E90 328i 6MT sport/prem
Join Date: May 2012
Location: Oakville, Ontario

iTrader: (0)

Quote:
Originally Posted by Rupes View Post
Is alternator overrun bad? I now have three very different answers - I preferred the intake answer the best, heh. Maybe that means it's time to post a clip of the sound.
That just means that the alternator's momentum has it spinning faster than the engine when the engine slows quickly. The one-way bearing in the pulley is there for a reason and that is to allow that to happen. This is the first car I've had where the alternator pulley wasn't just a pulley.

I'm not sure exactly what people thought was "spinning" or "spooling down" in a tube carrying air just because you revved the engine up, but....

Now, that being said, as a 6MT driver I actually find that the engine doesn't have ENOUGH momentum. Sure you can do these cool sounding throttle blips that sound really responsive but it can be a PITA to drive when the revs drop like a stone every gear change, especially with the 328 being made "extra quiet" for whatever reason.
Appreciate 0
      05-30-2013, 09:48 AM   #16
cyclicoyster
Private
1
Rep
96
Posts

 
Drives: 2009 BMW 328i
Join Date: Oct 2012
Location: Atlanta, GA

iTrader: (0)

I notice a gentle whistling sound on my car, but at very low revs. My car is a 328i, and DD, so on a daily basis it doesn't get driven hard. I have an AT, and it shifts at around 2500 rpms. The whistling sound starts at take off and quiets down at around 50mph. Have no idea what it is, but the car is running perfectly fine. Add to that, I love the way that sounds. I don't mind it at all. Sometimes I turn the stereo off just to hear that
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 10:03 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST