Sound deadening

King_Slayer · 02-28-2016, 11:13 PM

Quote:

Originally Posted by Kantalias

This has been discussed in this thread, but your numbers don't match. Do you have anything to bolster your contradictory data?

Also, dB SPL typically aren't A-weighted. Do you intend these units?

Yes, since we were taking figures from Car and Driver magazine on the M2, I thought I would match it with 2011 September issue of Road And Track where they put the 1M up against the Cayman R and Lotus Evora S. The numbers I put up is straight from that source.

I am not an expert on sound nor have I driven the M2. Just adding some comparative numbers out there.

Spook410 · 03-02-2016, 06:24 PM

Quote:

Originally Posted by OrangeCrush

It's odd but that's not my experience in my 1M. I've never had to yell. I think your being sensational maybe?

I hope you're right Orange. However I used to design control centers for NASA and the military. We had pretty stringent requirements on db levels in those environments. We used white and pink noise generators for test and when you get up around 70db you had to make sure you were heard by raising your voice and speaking distinctly. Doesn't make me any sort of expert but I don't think I'm being too carried away. I would like quite a bit less in my daily driver.

As for those that noted that the M3 is as loud, you are certainly correct according to some reports but not according to others. Maybe we'll see some differing measurements on the M2 as well.

Spook410 · 03-02-2016, 08:15 PM

They typical real world reference for 70db is a noisy restaurant. Just test drove a 340 a week ago. It was certainly quieter than 70db cruising at 70mph. Maybe the C&D numbers will be overly pessimistic for the M2 as well.

As for 3db being hardly noticeable, maybe that's true in the real world at high sound levels. Certainly not the case in a closed environment running noise generators. In that setting 3db was very noticeable. I think it would be in a car as well. Look at different models that run at 67db that we think of as luxo-cruisers compared to hot hatches running at 70db. At 72db you are now in the realm of old GT500's and Camaro ZL1's. Cool cars for what they are.. but not commuters.

rich8566 · 12-18-2016, 09:51 AM

Quote:

Originally Posted by King_Slayer

Do we know what setting the M2 was in during the testing? If it was in Sport or Sport+ how much louder do you think that will be compared to comfort?

What's the difference in the level of noise with the active sound coded out?

bmwv · 03-28-2018, 07:18 AM

Quote:

Originally Posted by Artemis

M235i sound insulation:
Attachment 1370267

M235i heat insulation:
Attachment 1370268

Any idea wii 13, 18 and 37 fit m2?

skiparock · 03-28-2018, 08:04 AM

Search the forum for the m2 teardown and racer rebuild. I believe he found almost no material

bmwv · 03-28-2018, 12:41 PM

Quote:

Originally Posted by skiparock

Search the forum for the m2 teardown and racer rebuild. I believe he found almost no material

I know they are not there the question is will they fit if i try to put them.

GregoryK · 03-28-2018, 02:39 PM

I'm about to add insulation ($450 worth) to my M2. I am losing my hearing so have trouble hearing my wife. Will take some readings at 70mph before (with ASD) and after with insulation and without ASD.
Give me a couple of weeks..

AndrewC1989 · 03-28-2018, 02:48 PM

Quote:

Originally Posted by GregoryK

I am losing my hearing so have trouble hearing my wife.

Sounds like a blessing in disguise

bmwv · 03-28-2018, 03:13 PM

Quote:

Originally Posted by GregoryK

I'm about to add insulation ($450 worth) to my M2. I am losing my hearing so have trouble hearing my wife. Will take some readings at 70mph before (with ASD) and after with insulation and without ASD.
Give me a couple of weeks..

I would be very interested to read more about your project. It would be interesting if you can take a reading without asd and no extra insulation too.

GregoryK · 03-28-2018, 03:44 PM

Quote:

Originally Posted by bmwv

I would be very interested to read more about your project. It would be interesting if you can take a reading without asd and no extra insulation too.

I only have a Decible X on my phone. Will try.

bmwv · 03-28-2018, 07:45 PM

Quote:

Originally Posted by GregoryK

I only have a Decible X on my phone. Will try.

Do u want to tell us what is the plan? What insulation are u putting and where?

GregoryK · 03-28-2018, 07:58 PM

Quote:

Originally Posted by bmwv

Do u want to tell us what is the plan? What insulation are u putting and where?

Here is the list:

51487221993

Sound insulation, engine compartment.

51489119216

Clip for above x 18

.................................................. ...

.................................................. ...

51487296055

SOUND INSULATION TRUNK LEFT

51471911992

Fixing plug x12

D = 8MM

51487296056

SOUND INSULATION TRUNK RIGHT

.................................................. ......

51487319479
SOUND INSULATION, DOOR, FRONT LEFT

51487319480
SOUND INSULATION, DOOR, FRONT right

.................................................. ........

51487334357
SOUND INSULATING WHEEL HOUSING REAR LEFT

51487334358
SOUND INSULATING WHEEL HOUSING RIGHT LEFT

.................................................. .........

Door and front wheel noise

51487300693
Sealing side panel, left

51487300694
Sealing side panel right

GregoryK · 03-28-2018, 08:01 PM

First image is the insulation in the M2.

I will also add deadening as required

bmwv · 03-29-2018, 06:31 PM

I already have asd off, 51487221993 and 05 on the schema but there is still lots of road noise.
real oem shows that door insulation 51487319479, 51487319480 is already on the car.
http://www.realoem.com/bmw/enUS/part...&q=51487319479

akkando · 03-29-2018, 07:10 PM

Quote:

Originally Posted by bmwv

I already have asd off, 51487221993 and 05 on the schema but there is still lots of road noise.
real oem shows that door insulation 51487319479, 51487319480 is already on the car.
http://www.realoem.com/bmw/enUS/part...&q=51487319479

I don't think 51487319479 is on the car. I think there are a bunch of threads already about people adding it back. The other 2 series cars have it though.

bmwv · 03-30-2018, 12:38 AM

Quote:

Originally Posted by akkando

I don't think 51487319479 is on the car. I think there are a bunch of threads already about people adding it back. The other 2 series cars have it though.

Ok there might be some mix up with the part numbers what i am saying is that what is shown on the diagram above as 05 is not on the car and 12 is. Am i wrong?

GregoryK · 04-03-2018, 02:52 PM

Give me a week have all the parts.
Ill do a write up.

voyagergab · 04-03-2018, 03:12 PM

Quote:

Originally Posted by GregoryK

Give me a week have all the parts.
Ill do a write up.

Appreciate it!

GregoryK · 04-03-2018, 07:45 PM

OK for starters the insulation that they removed for the rear of the car does not weigh much. As you can see in the pics here there is basically none.
The worst noise maker looks to be the lack of part # 41007294289 and 41007294290. The big hole you see above the rear seats has a cover (light weight) in the F22. Without the cover noise from the rear wheels travels right into the cabin unstopped. I will cover the hole with Dynamat as the part are only available from Germany. I also applies some rubber base foam to outside body. It is pretty thin right there.
Right of the bat - I don't buy the weight saving aspect....and the lack of the cover so the driver can hear the wheel spinning....guess some of you like that noise - not me. Give me exhaust and engine every time!
Measured the sound in the cabin before I did any of this
82db at 70mph
82db At 70mph with the ASD bypassed.
With the back open like this 92db at 70mph! ...and it sounds like the exhaust sound is in the car!
Stand by for more updates.

Poochie · 04-03-2018, 08:35 PM

They removed all that 'weight,' I am sure it must of saved a whopping 2 pounds.... Weight Reduction to BMW = Cost Cutting. That's why they also removed the blue stitching on the knee pad, you know, weight reduction. A daily car doesn't need to be obnoxiously loud to be fun and enjoyable.

Now if this was a Murcielago, that would be another story...

Hops128i · 04-03-2018, 08:40 PM

Cool pics of a M2 race car build!!! Then I read the rest, how depressing

03-02-2016, 08:15 PM	#113
Spook410 Second Lieutenant 184 Rep 233 Posts Drives: Infiniti EX35 Join Date: Feb 2015 Location: United States iTrader: (0)	They typical real world reference for 70db is a noisy restaurant. Just test drove a 340 a week ago. It was certainly quieter than 70db cruising at 70mph. Maybe the C&D numbers will be overly pessimistic for the M2 as well. As for 3db being hardly noticeable, maybe that's true in the real world at high sound levels. Certainly not the case in a closed environment running noise generators. In that setting 3db was very noticeable. I think it would be in a car as well. Look at different models that run at 67db that we think of as luxo-cruisers compared to hot hatches running at 70db. At 72db you are now in the realm of old GT500's and Camaro ZL1's. Cool cars for what they are.. but not commuters. Last edited by Spook410; 03-02-2016 at 08:21 PM..
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03-28-2018, 08:04 AM	#116
skiparock Second Lieutenant 183 Rep 229 Posts Drives: 2018 M2 lbb manual Join Date: Sep 2012 Location: Austin iTrader: (0)	Search the forum for the m2 teardown and racer rebuild. I believe he found almost no material __________________ 18 M2 lbb manual exec (Euro Delivery) and PDC 11 e92 335i xdrive BSM/PE (Sold) 09 335i xdrive Monaco Blue (Traded) 02 330xi (Sold)
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03-28-2018, 02:39 PM	#118
GregoryK Captain 504 Rep 780 Posts Drives: M2 '18 Join Date: Aug 2014 Location: Canada iTrader: (0)	I'm about to add insulation ($450 worth) to my M2. I am losing my hearing so have trouble hearing my wife. Will take some readings at 70mph before (with ASD) and after with insulation and without ASD. Give me a couple of weeks.. __________________ "I would rather cry in a BMW than smile on a bicycle." Ma Nuo
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03-28-2018, 08:01 PM	#124
GregoryK Captain 504 Rep 780 Posts Drives: M2 '18 Join Date: Aug 2014 Location: Canada iTrader: (0)	First image is the insulation in the M2. I will also add deadening as required __________________ "I would rather cry in a BMW than smile on a bicycle." Ma Nuo
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03-29-2018, 06:31 PM	#125
bmwv Second Lieutenant 108 Rep 234 Posts Drives: 325i Manual, M2 LBB DCT Join Date: Jan 2006 Location: CA iTrader: (0) Garage List 2017 BMW M2 [0.00] 2006 BMW 325i [0.00]	I already have asd off, 51487221993 and 05 on the schema but there is still lots of road noise. real oem shows that door insulation 51487319479, 51487319480 is already on the car. http://www.realoem.com/bmw/enUS/part...&q=51487319479
	Appreciate 0 Quote

04-03-2018, 02:52 PM	#128
GregoryK Captain 504 Rep 780 Posts Drives: M2 '18 Join Date: Aug 2014 Location: Canada iTrader: (0)	Give me a week have all the parts. Ill do a write up. __________________ "I would rather cry in a BMW than smile on a bicycle." Ma Nuo
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04-03-2018, 07:45 PM	#130
GregoryK Captain 504 Rep 780 Posts Drives: M2 '18 Join Date: Aug 2014 Location: Canada iTrader: (0)	OK for starters the insulation that they removed for the rear of the car does not weigh much. As you can see in the pics here there is basically none. The worst noise maker looks to be the lack of part # 41007294289 and 41007294290. The big hole you see above the rear seats has a cover (light weight) in the F22. Without the cover noise from the rear wheels travels right into the cabin unstopped. I will cover the hole with Dynamat as the part are only available from Germany. I also applies some rubber base foam to outside body. It is pretty thin right there. Right of the bat - I don't buy the weight saving aspect....and the lack of the cover so the driver can hear the wheel spinning....guess some of you like that noise - not me. Give me exhaust and engine every time! Measured the sound in the cabin before I did any of this 82db at 70mph 82db At 70mph with the ASD bypassed. With the back open like this 92db at 70mph! ...and it sounds like the exhaust sound is in the car! Stand by for more updates. Attached Images __________________ "I would rather cry in a BMW than smile on a bicycle." Ma Nuo
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04-03-2018, 08:35 PM	#131
Poochie Luxury at the redline :) 9105 Rep 7,563 Posts Drives: 2016 M2 Join Date: Aug 2012 Location: NYC iTrader: (3)	They removed all that 'weight,' I am sure it must of saved a whopping 2 pounds.... Weight Reduction to BMW = Cost Cutting. That's why they also removed the blue stitching on the knee pad, you know, weight reduction. A daily car doesn't need to be obnoxiously loud to be fun and enjoyable. Now if this was a Murcielago, that would be another story... Last edited by Poochie; 04-03-2018 at 08:55 PM..
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04-03-2018, 08:40 PM	#132
Hops128i Captain 71 Rep 675 Posts Drives: 2010 128i, manual, sport pkg Join Date: Aug 2010 Location: Silver Spring, Maryland iTrader: (0)	Cool pics of a M2 race car build!!! Then I read the rest, how depressing __________________ 2010 128i manual, sport package, performance exhaust, Vorshlag camber plates, Bilstein B6 struts/shocks, 245/40/17 ZIII square on et 40 with rolled rear fenders.
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