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



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      05-26-2013, 10:00 PM   #1
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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.
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      05-26-2013, 10:33 PM   #2
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Intake sound.
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      05-26-2013, 11:14 PM   #3
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Intake sound.
Your right, thanks. /thread
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      05-28-2013, 01:11 AM   #4
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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?
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      05-28-2013, 02:09 AM   #5
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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.
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      05-28-2013, 09:40 AM   #6
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I think it is the twin turbos spooling
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      05-28-2013, 09:54 AM   #7
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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.
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      05-28-2013, 10:03 AM   #8
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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?
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      05-28-2013, 10:30 AM   #9
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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.
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      05-28-2013, 11:43 AM   #10
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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
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      05-29-2013, 07:54 AM   #11
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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.
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      05-29-2013, 10:13 AM   #12
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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.
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      05-29-2013, 11:07 AM   #13
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It's the vanos system doing its thing. Not the intake.
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      05-29-2013, 02:00 PM   #14
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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.
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      05-30-2013, 08:02 AM   #15
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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.
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      05-30-2013, 10:48 AM   #16
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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
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