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      12-04-2012, 08:34 PM   #1
URBAN LEGEND
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Jet or turbine sound as you decel/downshift towards a stop light

What is that jet or turbine sound as you decel/downshift towards a stop light or full stop? I had the same sound on my 09 M3 DCT.

That sound was non existent on the crappy 11 550i. So we know its not the turbos.

I am thinking its the DCT tranny. Thoughts?

Love that sound BTW.
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      12-04-2012, 10:08 PM   #2
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So no one else has their car produce this sound? Understood. Thanks.
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      12-04-2012, 11:09 PM   #3
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It's your sphincter unclinching from driving such a bad ass car.
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      12-04-2012, 11:18 PM   #4
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I don't have my M5 yet, But maybe it's the flux capacitor???? Did you get to 88MPH???
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      12-05-2012, 02:29 AM   #5
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It's the downshift of the DCT I think. It's more distinct on the m performance exhaust on my lre m3 (;
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      12-05-2012, 02:54 AM   #6
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Quote:
Originally Posted by LAKEOM5 View Post
It's your sphincter unclinching from driving such a bad ass car.
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      12-05-2012, 09:48 AM   #7
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Quote:
Originally Posted by LAKEOM5 View Post
It's your sphincter unclinching from driving such a bad ass car.
Thanks for dumb reply.
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      12-05-2012, 09:49 AM   #8
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Quote:
Originally Posted by Rohardi View Post
I don't have my M5 yet, But maybe it's the flux capacitor???? Did you get to 88MPH???
So why are you commenting on a car you dont have? Contribute or go away.
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      12-05-2012, 10:35 AM   #9
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Quote:
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So why are you commenting on a car you dont have? Contribute or go away.
I'm sorry, It was a joke. I didn't realize you had to be in the exclusive club ownership to comment. I'll come back in the summer when I get My car. Troll much????
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      12-05-2012, 06:15 PM   #10
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Quote:
Originally Posted by URBAN LEGEND View Post
What is that jet or turbine sound as you decel/downshift towards a stop light or full stop? I had the same sound on my 09 M3 DCT.

That sound was non existent on the crappy 11 550i. So we know its not the turbos.

I am thinking its the DCT tranny. Thoughts?

Love that sound BTW.
If its more noticeable when slowing quickly its probably the front brakes 'whirring' as you slow down to a stop. Fairly typical with a two piece rotor design.
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      12-06-2012, 12:04 AM   #11
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Quote:
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Thanks for dumb reply.


Ask a dumb question.....




Lighten up Francis.
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      12-23-2012, 07:46 PM   #12
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i think youre just talking about the sound of the gear downshifts/ rev's decreasing... ?
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      12-23-2012, 10:29 PM   #13
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Any sound clip so we know what it is?
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      12-24-2012, 07:34 AM   #14
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Quote:
Originally Posted by LAKEOM5
Quote:
Originally Posted by URBAN LEGEND View Post
Thanks for dumb reply.


Ask a dumb question.....




Lighten up Francis.
Agree, maybe this post didn't really occur in the first place to where it doesn't require an answer?

Sheesh
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      12-25-2012, 01:52 AM   #15
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It's normal drivetrain noise
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      12-25-2012, 08:56 AM   #16
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Quote:
Originally Posted by dr.skp.ortho View Post
It's normal drivetrain noise
Mine's the same, it's the DCT and sounds like a truck sometimes. Hoping that it goes away with the 1200mi service. Do they change out the tranny fluid @ 1200?
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      12-25-2012, 12:08 PM   #17
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I believe it is normal drivetrain noise too. I hear it on my car and it reminds me of the gear "whine" you would hear on a sequential race transmission (like a Hewland or Xtrac). Gearboxes with straight-gears typically have this sound although its usually louder and more pronouced. I am not familiar with the gear design in the F10 M5 but I'm assuming its something similar. I know what you're talking about - most pronouced on a decel to a red-light at certain RPMs - and it's definitely not the active sound.
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      12-25-2012, 04:09 PM   #18
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Sounds like drivetrain noise. It's probably from the tooths on the gears as they are transferring force/torque on the "wrong" side of the gear teeth. They are designed to transfer torque under acceleration and might make more noise when decelerating as the teeth are engaging on the opposite side of the tooth. Race transmissions or transmissions that are for heavy duty use have more straight cut gears. Straight cut gears make more noise but don't generate the longitudinal force that wants to push the driving and driven gears apart from each other (one gear wants to go forward and the other rearwards, creating a lot of frictional losses and stress on bearings).

An automatic transmission uses planetary gears and don't operate in the same way as a manual transmission.

My guess is gear noise.
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      12-25-2012, 04:45 PM   #19
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Quote:
Originally Posted by URBAN LEGEND View Post
What is that jet or turbine sound as you decel/downshift
or maybe its those 2 turbines in the engine?

...
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      12-26-2012, 05:40 AM   #20
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Quote:
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or maybe its those 2 turbines in the engine?

...
Probably not as he said that his M3 DCT had the same noise and that his 550i did not (which also has two turbines).

The only common relevant item between the M3 and M5 is a DCT transmission?
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      12-27-2012, 04:44 PM   #21
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I've test driven two M5's, they all have the same sound. The one I ended up with has this sound as well. I actually like it, makes me feel like I'm in a jet

My only complaint is that during very cold weather (below freezing), it seems to 'screech' but goes away quickly once it's warmed up.
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      12-27-2012, 05:02 PM   #22
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Quote:
Originally Posted by dliang View Post
I've test driven two M5's, they all have the same sound. The one I ended up with has this sound as well. I actually like it, makes me feel like I'm in a jet

My only complaint is that during very cold weather (below freezing), it seems to 'screech' but goes away quickly once it's warmed up.
Confirmed. It is a little bit "chatty" when the outside temp is below 35 (until it warms up). Parking it in the (unheated) garage doesn't seem to improve it either.

If you haven't driven a GTR, then you don't know how good you got it. Performance and (quiet) luxury in the M5 is so much better. At the end of the day, it is still a hi perf machine with moving parts.
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