Jet or turbine sound as you decel/downshift towards a stop light - M5POST

URBAN LEGEND · 12-04-2012, 08:34 PM

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.

URBAN LEGEND · 12-04-2012, 10:08 PM

So no one else has their car produce this sound? Understood. Thanks.

LAKEOM5 · 12-04-2012, 11:09 PM

It's your sphincter unclinching from driving such a bad ass car.

Rohardi · 12-04-2012, 11:18 PM

I don't have my M5 yet, But maybe it's the flux capacitor???? Did you get to 88MPH???

HatersGonHateSMH · 12-05-2012, 02:29 AM

It's the downshift of the DCT I think. It's more distinct on the m performance exhaust on my lre m3 (;

wisesoul · 12-05-2012, 02:54 AM

Quote:

Originally Posted by LAKEOM5

It's your sphincter unclinching from driving such a bad ass car.

URBAN LEGEND · 12-05-2012, 09:48 AM

Quote:

Originally Posted by LAKEOM5

It's your sphincter unclinching from driving such a bad ass car.

Thanks for dumb reply.

URBAN LEGEND · 12-05-2012, 09:49 AM

Quote:

Originally Posted by Rohardi

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.

Rohardi · 12-05-2012, 10:35 AM

Quote:

Originally Posted by URBAN LEGEND

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????

thebishman · 12-05-2012, 06:15 PM

Quote:

Originally Posted by URBAN LEGEND

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.
Bish

LAKEOM5 · 12-06-2012, 12:04 AM

Quote:

Originally Posted by URBAN LEGEND

Thanks for dumb reply.

Ask a dumb question.....

Lighten up Francis.

mainly · 12-23-2012, 07:46 PM

i think youre just talking about the sound of the gear downshifts/ rev's decreasing... ?

smashhell · 12-23-2012, 10:29 PM

Any sound clip so we know what it is?

bradone1 · 12-24-2012, 07:34 AM

Quote:

Originally Posted by LAKEOM5

Quote:

Originally Posted by URBAN LEGEND

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

dr.skp.ortho · 12-25-2012, 01:52 AM

It's normal drivetrain noise

Warehouser · 12-25-2012, 08:56 AM

Quote:

Originally Posted by dr.skp.ortho

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?

dropstart67 · 12-25-2012, 12:08 PM

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.

Boss330 · 12-25-2012, 04:09 PM

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.

mainly · 12-25-2012, 04:45 PM

Quote:

Originally Posted by URBAN LEGEND

What is that jet or turbine sound as you decel/downshift

or maybe its those 2 turbines in the engine?

...

Boss330 · 12-26-2012, 05:40 AM

Quote:

Originally Posted by mainly

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?

Protious · 12-27-2012, 04:44 PM

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.

johntomferg · 12-27-2012, 05:02 PM

Quote:

Originally Posted by dliang

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.

12-04-2012, 08:34 PM	#1
URBAN LEGEND Champ Drives: '13 M5 Join Date: Feb 2009 Location: GA Posts: 1,137 iTrader: (0)	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. __________________ 2013 M5 2011 550i-Sold and not missed 2009 M3-What a machine.
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12-04-2012, 10:08 PM	#2
URBAN LEGEND Champ Drives: '13 M5 Join Date: Feb 2009 Location: GA Posts: 1,137 iTrader: (0)	So no one else has their car produce this sound? Understood. Thanks. __________________ 2013 M5 2011 550i-Sold and not missed 2009 M3-What a machine.

12-23-2012, 10:29 PM	#13
smashhell First Lieutenant Drives: 2011 535i Join Date: Dec 2011 Location: Los Angeles, CA Posts: 367 iTrader: (0)	Any sound clip so we know what it is? __________________ 2011 535i Alpine White, Oyster on black interior, Premium 1 & 2 Package, Magnaflow Full Cat-Back Exhaust, JB4 Stage 2

12-25-2012, 01:52 AM	#15
dr.skp.ortho Private Drives: 991 911 Carrera S, F10M5 Join Date: Jul 2007 Location: NSW, Australia Posts: 88 iTrader: (0)	It's normal drivetrain noise __________________ Porsche 991 911 Carrera S BMW F10 M5 Jeep Grand Cherokee 5.7L Hemi V8 Mazda CX5 GT Diesel.

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12-04-2012, 11:09 PM	#3
LAKEOM5 Second Lieutenant Drives: 2013 M5 Black Sapphire Join Date: Apr 2012 Location: Lake Oswego, Oregon Posts: 288 iTrader: (0)	It's your sphincter unclinching from driving such a bad ass car.

12-04-2012, 11:18 PM	#4
Rohardi Second Lieutenant Drives: 2010 G37XS Join Date: Apr 2012 Location: Rhode Island Posts: 240 iTrader: (0)	I don't have my M5 yet, But maybe it's the flux capacitor???? Did you get to 88MPH???

12-05-2012, 02:29 AM	#5
HatersGonHateSMH Banned Drives: Frozen white m5/Fire orange m3 Join Date: Oct 2012 Location: Los alamitos, California Posts: 36 iTrader: (0)	It's the downshift of the DCT I think. It's more distinct on the m performance exhaust on my lre m3 (;

12-23-2012, 07:46 PM	#12
mainly Second Lieutenant Drives: F10 M5 imperial blue Join Date: Mar 2012 Location: Edmonton alberta, canada. Posts: 281 iTrader: (0)	i think youre just talking about the sound of the gear downshifts/ rev's decreasing... ?

12-25-2012, 12:08 PM	#17
dropstart67 New Member Drives: 2013 M5 Join Date: Sep 2012 Location: So Cal Posts: 17 iTrader: (0)	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.

12-25-2012, 04:09 PM	#18
Boss330 First Lieutenant Drives: F10 Havana/Mojave Brown Join Date: Mar 2012 Location: Europe Posts: 396 iTrader: (0)	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.

12-27-2012, 04:44 PM	#21
Protious Enlisted Member Drives: 2013 BMW M5 Join Date: Nov 2012 Location: Texas Posts: 36 iTrader: (0) Garage List 2013 BMW M5 [0.00]	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.