Objective analysis of cabin noise solutions

Rui Z · 01-21-2011, 10:24 AM

OP, I think Nissan addressed the noise issue on the 2011 models. Why don't you try to find out what Nissan did to make it less noisy. I think it had something to do with the air box. Let us know.

shadoquad · 01-21-2011, 10:27 AM

Quote:

Originally Posted by Falcor

what if someone reads this post and thinks that 370s are noisy!?! I dont want non owners to think its noisy...Give me a break

It's not about that, really. It's just that it's an opinion, not a fact. The Z may or may not be too noisy for you. It's subjective to the driver. I don't care what non-owners think. They need to drive the car on their own and form their opinions. I just don't like having words put in my mouth. It's no general consensus. It's an opinion.

Falcor · 01-21-2011, 10:30 AM

Quote:

Originally Posted by shadoquad

It's not about that, really. It's just that it's an opinion, not a fact. The Z may or may not be too noisy for you. It's subjective to the driver. I don't care what non-owners think. They need to drive the car on their own and form their opinions. I just don't like having words put in my mouth. It's no general consensus. It's an opinion.

my comment weren't directed at you, they were for some of the "harsher" posters

shadoquad · 01-21-2011, 10:31 AM

Quote:

Originally Posted by Falcor

my comment weren't directed at you, they were for some of the "harsher" posters

Ah. Sorry, then. I jumped the gun.

And again, I think the OP is just trying to be helpful for those in the market of sound deadening, which is a significant portion of our user base.

Falcor · 01-21-2011, 10:33 AM

i think if we can make the ride more comfortable, why not? Personally I wouldnt want to add too much weight to achieve this but if the car is a daily driver some might.

But i think M4A1Mustang is right about the amount of weight that would be needed to significantly reduce noise.

Mt Tam I am · 01-21-2011, 10:42 AM

Quote:

Originally Posted by Matthew

Mine was 106db with the wife inside, and 85 without her.

Quote:

Originally Posted by mengel

If you don't like the road noise, buy an exhaust, an intake and some high flow cats. Wont here the road noise over that...

I bought a Stillen CBE and now I turn down the music just to listen to the sound.

Quote:

Originally Posted by ThoriumHotdog

Wow. I didn't expect these type of responses after reading the OP.

Neither did I.

Quote:

Originally Posted by SeattleLion

There is general agreement that the 370Z is noisy. The sport package versions appear to be the loudest. There also is agreement that reducing the road noise would be a good thing.

Sort of like the agreement that manuals are for drivers and autos are for posers. Starting out like this may have been the catalyst.

Quote:

Originally Posted by shadoquad

I found the OP's wording to be objectionable. I'm not a big fan of the theory that the car is noisy, but folks are entitled to the opinion. It's when one suggests that it is a consensus that the car is noisy that one is incorrect. It's an opinion shared by some, but apparently not by most.

But I also agree that OP was trying to be helpful in getting a feel for which sound deadening product does the job better. I think that would be helpful for those in the market.

He is only asking.

daisuke149 · 01-21-2011, 11:03 AM

Quote:

Originally Posted by Falcor

i think if we can make the ride more comfortable, why not? Personally I wouldnt want to add too much weight to achieve this but if the car is a daily driver some might.

But i think M4A1Mustang is right about the amount of weight that would be needed to significantly reduce noise.

wouldnt need to add a ton of weight, but then costs go up.

A single plexiglass barrier between cabin/trunk area would eliminate alot and then just a lil sound deadening in the doors would probably do wonders.

Issue is, how to make the glass barrier and cost for that. And then where to mount it without drilling etc. Also a removable one would be best IMO. Kinda like T-Tops! but for the inside...

Falcor · 01-21-2011, 11:22 AM

Quote:

Originally Posted by daisuke149

wouldnt need to add a ton of weight, but then costs go up.

A single plexiglass barrier between cabin/trunk area would eliminate alot and then just a lil sound deadening in the doors would probably do wonders.

Issue is, how to make the glass barrier and cost for that. And then where to mount it without drilling etc. Also a removable one would be best IMO. Kinda like T-Tops! but for the inside...

maybe that would work, but i wouldn't do it. Not only would it kill my sub but i think it would look awful.

daisuke149 · 01-21-2011, 11:29 AM

Quote:

Originally Posted by Falcor

maybe that would work, but i wouldn't do it. Not only would it kill my sub but i think it would look awful.

it would only look awful if the design was awful...

and it would possibly damped the OEM sub but an aftermarket sub shouldnt be effected as much.

SeattleLion · 01-21-2011, 11:36 AM

I am amazed at the emotional response to a suggestion on how we can put numbers around an issue that a lot of people share. For example, Consumers Reports, Car and Driver, Road and Track, Top Gear.... to name a few all cite the car as noisy. In my original post I didn't say that *I* find the car too noisy, just that if we apply the same kind of approach we use for engine, exhaust, brake mods (numbers!), we can help people who *want* to reduce noise find the best solution.

In answer to one of the adult posts, I suggest the phone be held next to the right ear of the driver. This would probably yield a reasonable baseline.

That's it.

SeattleLion · 01-21-2011, 11:46 AM

Quote:

Originally Posted by Rui Z

From Edmund's InsideLine

Nismo 370Z Test Results:

Test Results:
0 - 30 (sec): 2.1
0 - 45 (sec): 3.6
0 - 60 (sec): 5.3
0 - 75 (sec): 7.7
1/4 Mile (sec @ mph): 13.6 @ 103.2
0-60 with 1-ft Rollout (sec): 5.1
30 - 0 (ft): 28
60 - 0 (ft): 115
Slalom (mph): 70.4
Skid Pad Lateral acceleration (g): 0.91
Db @ Idle: 47.1
Db @ Full Throttle: 84.8
Db @ 70 mph Cruise: 72.9

370Z Touring Test Results:

0 - 30 (sec): 2.0
0 - 45 (sec): 3.5
0 - 60 (sec): 5.2
0 - 75 (sec): 7.6
1/4 Mile (sec @ mph): 13.5 @ 103.7
0-60 with 1-ft Rollout (sec): 4.9
30 - 0 (ft): 26
60 - 0 (ft): 108
Slalom (mph): 72.0
Skid Pad Lateral acceleration (g): 0.94
Db @ Idle: 49.2
Db @ Full Throttle: 82.7
Db @ 70 mph Cruise: 70.3

Compared to

Mercedes C350 Test Results:

Test Results:
0 - 45 (sec): 4.0
0 - 60 (sec): 6.2
0 - 75 (sec): 9.0
1/4 Mile (sec @ mph): 14.5 @ 96.5
30 - 0 (ft): 30
60 - 0 (ft): 118
Slalom (mph): 67.6
Skid Pad Lateral acceleration (g): 0.83
Db @ Idle: 43.3
Db @ Full Throttle: 75.8
Db @ 70 mph Cruise: 65.2

These results are interesting but unfortunately not too helpful. We don't know what sort of road surface was involved or where the measurement was made. Assuming that the Edmunds results are consistent between cars, the touring Z was about 5 db louder than the Mercedes. That would be around 25% more noise.

What I was hoping we could do is get the difference in the same car of the noise level before and after sound treatment. With that data, members could compare solutions versus cost, etc. and decide what, if anything they want to do.

shadoquad · 01-21-2011, 11:54 AM

Quote:

Originally Posted by SeattleLion

I am amazed at the emotional response to a suggestion on how we can put numbers around an issue that a lot of people share. For example, Consumers Reports, Car and Driver, Road and Track, Top Gear.... to name a few all cite the car as noisy. In my original post I didn't say that *I* find the car too noisy, just that if we apply the same kind of approach we use for engine, exhaust, brake mods (numbers!), we can help people who *want* to reduce noise find the best solution.

In answer to one of the adult posts, I suggest the phone be held next to the right ear of the driver. This would probably yield a reasonable baseline.

That's it.

I think Mt Tam hit it on the head, though. The emotional response was due to the first paragraph. You suggested a solid consensus that just isn't there.

Like I said, I found the rest of the post to be about providing helpful analysis.

kenchan · 01-21-2011, 11:56 AM

Quote:

Originally Posted by SeattleLion

In answer to one of the adult posts, I suggest the phone be held next to the right ear of the driver. This would probably yield a reasonable baseline.

That's it.

if you're really going to measure db, get a real SPL meter and a good one.

phone + apps can vary over 15dB right off. 3dB is twice the sound level, not 10dB. then add the phone's pre-programmed audio software that calibrates max performance of that mic in that housing, add multi-array setup phones that actually CANCEL noise outside the polar pattern you got basically a super biased reading of your cabin.

kinda like measuing horse power via your butt.

shadoquad · 01-21-2011, 11:57 AM

Quote:

Originally Posted by kenchan

if you're really going to measure db, get a real SPL meter and a good one.

phone + apps can vary over 15dB right off. 3dB is twice the sound level, not 10dB. then add the phone's pre-programmed audio software that calibrates max performance of that mic in that housing, add multi-array setup phones that actually CANCEL noise outside the polar pattern you got basically a super biased reading of your cabin.

kinda like measuing horse power via your butt.

lol the good ol' butt dyno

Cmike2780 · 01-21-2011, 12:00 PM

Earplugs will work wonders, but I personally could care less about the noise.

01-21-2011, 10:24 AM	#46 (permalink)
Rui Z Track Member Join Date: Feb 2010 Location: (.)(.) Posts: 931 Drives: 8====D Rep Power: 17	OP, I think Nissan addressed the noise issue on the 2011 models. Why don't you try to find out what Nissan did to make it less noisy. I think it had something to do with the air box. Let us know. __________________

01-21-2011, 11:36 AM	#55 (permalink)
SeattleLion Base Member Join Date: Sep 2010 Location: Seattle WA Posts: 226 Drives: '13 Mustang GT Prem. Rep Power: 234	I am amazed at the emotional response to a suggestion on how we can put numbers around an issue that a lot of people share. For example, Consumers Reports, Car and Driver, Road and Track, Top Gear.... to name a few all cite the car as noisy. In my original post I didn't say that I find the car too noisy, just that if we apply the same kind of approach we use for engine, exhaust, brake mods (numbers!), we can help people who want to reduce noise find the best solution. In answer to one of the adult posts, I suggest the phone be held next to the right ear of the driver. This would probably yield a reasonable baseline. That's it. jdsto likes this.

01-21-2011, 12:00 PM	#60 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 30	Earplugs will work wonders, but I personally could care less about the noise. __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

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01-21-2011, 10:33 AM	#50 (permalink)
Falcor Enthusiast Member Join Date: Sep 2010 Location: North Wilkesboro, NC Posts: 347 Drives: 2010 370 CFR edition Rep Power: 15	i think if we can make the ride more comfortable, why not? Personally I wouldnt want to add too much weight to achieve this but if the car is a daily driver some might. But i think M4A1Mustang is right about the amount of weight that would be needed to significantly reduce noise.