Increasing interior noise naturally

widetyres · 05-09-2019, 05:54 AM

Quote:

Originally Posted by Anthony1s

Just took my insulation out. I can't tell a difference in sound. And both pieces weigh 2.2lbs for what it's worth. I don't see a reason to put it back in.

Are you running with asd enabled? Might be that the asd is drowning it out if enabled.

Anthony1s · 05-09-2019, 11:10 AM

Quote:

Originally Posted by widetyres

Are you running with asd enabled? Might be that the asd is drowning it out if enabled.

Nope, it's disabled.

Edit: just got back from a drive. I can hear a difference now. Faint whining at low rpm/low load and more general noise at idle. I think my MPE is too loud to hear much difference under load.

akkando · 05-09-2019, 12:04 PM

Quote:

Originally Posted by Anthony1s

Quote:

Originally Posted by widetyres

Are you running with asd enabled? Might be that the asd is drowning it out if enabled.

Nope, it's disabled.

Edit: just got back from a drive. I can hear a difference now. Faint whining at low rpm/low load and more general noise at idle. I think my MPE is too loud to hear much difference under load.

I feel like I notice more woosh sound from turbo and intake?

akkando · 05-09-2019, 02:41 PM

deleted duplicate post

XutvJet · 05-09-2019, 03:07 PM

Quote:

Originally Posted by widetyres

Yep - its thickness varies from 1-2 inches.

With that all removed and the cover reinstalled, the engine just sounds more racy. 😊 Even with the windows up.

There aren't any more turbo sounds - difficult to explain but the engine has a rawness to it - must be the injectors, tappets etc all working away and now being audible.

Great suggestion by XutvJet.

Rip it out!

I took the cover off because of the following:

1) By intended design to keep the motor warm between restarts, the cover traps a lot of heat which ultimately degrades the wiring and hoses under the cover. Anything to lessen the heat damage, the better in my book.

2) I like being able to see/inspect the top of the motor easily for leaks, damage, evidence of rodents, etc.

3) Reduced motor heat soak.

4) Sound improvement. There is definitely more mechanical noise when under moderate to high load and none of the additional noise is ugly noise.

I installed the 540 valve cover to clean things are a bit and offer some protection to the exposed wires as it would have been difficult to wrap the wires safely.

3t3p · 05-11-2019, 05:48 AM

How is it held on then the engine cover? Rubber attachments? Do you just lift/pull it up?

So some of you are running with cover minus insulation and others running no engine cover at all?

My last car u ran without the engine cover due to an aftermarket intake but got the most engine sound in the cabin by removing the insulation liner under the bonnet

Anthony1s · 05-11-2019, 11:43 AM

Quote:

Originally Posted by 3t3p

How is it held on then the engine cover? Rubber attachments? Do you just lift/pull it up?

So some of you are running with cover minus insulation and others running no engine cover at all?

My last car u ran without the engine cover due to an aftermarket intake but got the most engine sound in the cabin by removing the insulation liner under the bonnet

There are hook-type things on the cover that push through holes in the insulation.

widetyres · 05-11-2019, 02:35 PM

Quote:

Originally Posted by 3t3p

How is it held on then the engine cover? Rubber attachments? Do you just lift/pull it up?

So some of you are running with cover minus insulation and others running no engine cover at all?

My last car u ran without the engine cover due to an aftermarket intake but got the most engine sound in the cabin by removing the insulation liner under the bonnet

It's just held on by about three or four ball /socket type fixings - just give it a good pull upwards and it'll come off. It could be a bit stiff given that it may never have been removed before.

3t3p · 05-11-2019, 04:25 PM

Nice one thanks so it's like most engine covers then

How glued on is the insulation?

widetyres · 05-11-2019, 04:45 PM

Quote:

Originally Posted by 3t3p

Nice one thanks so it's like most engine covers then

How glued on is the insulation?

The insulation is like Anthony says and is just hooked on - pulls off easily

3t3p · 05-13-2019, 08:35 AM

Quote:

Originally Posted by widetyres

The insulation is like Anthony says and is just hooked on - pulls off easily

Ah nice I'm gonna take a look.

Can insulation then go back on if so desired?

Anthony1s · 05-13-2019, 09:41 AM

Quote:

Originally Posted by 3t3p

Ah nice I'm gonna take a look.

Can insulation then go back on if so desired?

Yes

widetyres · 05-20-2019, 07:39 AM

Just as well it's a quick job - I've just noticed this in the new MOT (UK testing) checklist:

"under-bonnet noise deadening material fitted as original equipment"

It's a fail if not fitted.

I guess that on mine as the engine cover is still there means it might be ok, but I'll pop the insulation back in just to be on the safe side for the test.

3t3p · 05-20-2019, 01:22 PM

lol they're gonna rip off engine covers for MOTs!?

Bee Pee · 05-20-2019, 02:20 PM

Quote:

Originally Posted by 3t3p

lol they're gonna rip off engine covers for MOTs!?

No.

Anthony1s · 05-20-2019, 03:39 PM

What does MOT mean? A European inspection?

AndrewC1989 · 05-20-2019, 04:05 PM

Quote:

Originally Posted by Anthony1s

What does MOT mean? A European inspection?

https://en.wikipedia.org/wiki/MOT_test

Anthony1s · 05-20-2019, 04:56 PM

Quote:

Originally Posted by andrewc89

https://en.wikipedia.org/wiki/MOT_test

I would have no faith in my guessing ability if I just googled everything

Cristian135 · 05-20-2019, 05:14 PM

Remus and miltek downpipe 😍👏👏

NJ Drive · 09-12-2020, 02:37 PM

Bumping this.

I just happened to remove the engine cover today out of curiosity as to what's under there, and lo and behold found this massive foam rubber mat.

It took all of three seconds to convince myself that it should be removed for anyone doing track days/autocross/drag strip etc.

VisualEcho · 09-12-2020, 02:44 PM

Quote:

Originally Posted by NJ Drive

Bumping this.

I just happened to remove the engine cover today out of curiosity as to what's under there, and lo and behold found this massive foam rubber mat.

It took all of three seconds to convince myself that it should be removed for anyone doing track days/autocross/drag strip etc.

Thanks for bumping this thread bro, I had never heard of removing the insulation under the engine cover, but it sounds like I need to do just that.

I wonder if it'd be even better to run with the cover off completely?

I know in my Acura, all those plastic covers all over the engine bay really held in the heat, and degraded everything terribly. I know it looks cleaner that way, but it definitely holds in the heat, some of the plastic was so brittle it just fell apart in my hands.

NJ Drive · 09-12-2020, 09:13 PM

I personally kept the engine cover on. Removal of the insulation sitting directly on top of the entire engine should help immensely. I have never seen an OEM take it that far in regards to quelling engine noise.

05-09-2019, 02:41 PM	#26
akkando Major General 5863 Rep 6,635 Posts Drives: 17 M2 DCT LBB,11 e90 M3 ZCP IB Join Date: Jan 2017 Location: Bay Area iTrader: (1)	deleted duplicate post
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05-11-2019, 05:48 AM	#28
3t3p Major 455 Rep 1,389 Posts Drives: M2 Join Date: May 2018 Location: NZ iTrader: (0)	How is it held on then the engine cover? Rubber attachments? Do you just lift/pull it up? So some of you are running with cover minus insulation and others running no engine cover at all? My last car u ran without the engine cover due to an aftermarket intake but got the most engine sound in the cabin by removing the insulation liner under the bonnet
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05-11-2019, 04:25 PM	#31
3t3p Major 455 Rep 1,389 Posts Drives: M2 Join Date: May 2018 Location: NZ iTrader: (0)	Nice one thanks so it's like most engine covers then How glued on is the insulation?
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05-20-2019, 07:39 AM	#35
widetyres Lieutenant 279 Rep 488 Posts Drives: M3 E92 DCT, 2012 Join Date: Oct 2018 Location: UK iTrader: (0)	Just as well it's a quick job - I've just noticed this in the new MOT (UK testing) checklist: "under-bonnet noise deadening material fitted as original equipment" It's a fail if not fitted. I guess that on mine as the engine cover is still there means it might be ok, but I'll pop the insulation back in just to be on the safe side for the test.
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05-20-2019, 01:22 PM	#36
3t3p Major 455 Rep 1,389 Posts Drives: M2 Join Date: May 2018 Location: NZ iTrader: (0)	lol they're gonna rip off engine covers for MOTs!?
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05-20-2019, 03:39 PM	#38
Anthony1s Banned 756 Rep 2,149 Posts Drives: 2018 Mineral Grey M2 Join Date: Oct 2017 Location: Pennsylvania iTrader: (0)	What does MOT mean? A European inspection?
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05-20-2019, 05:14 PM	#41
Cristian135 Private First Class 19 Rep 103 Posts Drives: Bmw m2 Join Date: Feb 2018 Location: Barcelona iTrader: (0)	Remus and miltek downpipe 😍👏👏
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09-12-2020, 02:37 PM	#42
NJ Drive Private First Class 51 Rep 91 Posts Drives: 2018 M2 LCI Join Date: May 2013 Location: NNJR iTrader: (1)	Bumping this. I just happened to remove the engine cover today out of curiosity as to what's under there, and lo and behold found this massive foam rubber mat. It took all of three seconds to convince myself that it should be removed for anyone doing track days/autocross/drag strip etc.
	Appreciate 0 Quote

09-12-2020, 09:13 PM	#44
NJ Drive Private First Class 51 Rep 91 Posts Drives: 2018 M2 LCI Join Date: May 2013 Location: NNJR iTrader: (1)	I personally kept the engine cover on. Removal of the insulation sitting directly on top of the entire engine should help immensely. I have never seen an OEM take it that far in regards to quelling engine noise.
	Appreciate 0 Quote