Dynamat in the trunk

cranzy · 07-08-2015, 11:06 PM

Here is the final result. It helps; now I can have normal convo in my car

scottIN · 07-09-2015, 06:27 AM

Very clean. If you want quieter, go back and do the fenders. That's where a lot of the noise comes from. I used nearly 2 boxes of Dynomat. There is not an inch of bare metal showing from the seats back in mine.

cranzy · 07-09-2015, 09:52 AM

Quote:

Originally Posted by scottIN

Very clean. If you want quieter, go back and do the fenders. That's where a lot of the noise comes from. I used nearly 2 boxes of Dynomat. There is not an inch of bare metal showing from the seats back in mine.

Yeah, I know fenders let a lot of noise. I was so tired/impatient at this point that I couldn't care less about the spots I missed lol

Sent from my SM-G920T using Tapatalk

darkphantom · 07-10-2015, 03:08 PM

A side note, I noticed the noise from the fender area as well, not as much from the trunk side, can we get better fender wells/covering on the underside or is the CCF on the fenders the best bet?

cooltoy · 07-13-2015, 11:51 AM

So what is the final dB measurement?

cranzy · 07-14-2015, 11:15 AM

Quote:

Originally Posted by cooltoy

So what is the final dB measurement?

Oops. Forgot to do the measurement yesterday. If JARBLUE is correct then the db difference won't be significant. However, the sound is damped down and you can have a normal convo in the car (tested with a 350z friend of mine). Stay tuned for the db numbers.

RyanWest · 07-13-2015, 11:18 PM

In for final before and after dB readings!

JARblue · 07-14-2015, 10:11 AM

FWIW, I think the CCF is the stuff that will really affect dB readings. I borrowed a dB reader and the difference between my before and after readings was statistically insignificant with just the vibration dampener installed in my hatch. Even the difference between my before readings with the hatch completely bare and after with the Onyx installed and the spare tire and all panels put back in the hatch was very minimal.

cranzy · 07-14-2015, 10:55 PM

Here are the screen shot of the DB reader I took just for you peeps

Btw this is not the same reader that I initially used, but it gives you a good hint for how noisy the car is now.

cooltoy · 07-14-2015, 11:10 PM

So an increase from 20 to 59?

Love how they spelled breathing.

cranzy · 07-14-2015, 11:17 PM

Quote:

Originally Posted by cooltoy

So an increase from 20 to 59?

Love how they spelled breathing.

Lmao. I just noticed the brething xD. Anyhow, no man, it didn't increase, when I did the initial testing it was with some iOS sound meter app. This one is Android sound meter. I might borrow iOS just to confirm the numbers... I guess

RyanWest · 07-15-2015, 02:44 AM

Use one app and report back please

cranzy · 07-15-2015, 11:41 PM

Quote:

Originally Posted by RyanWest

Use one app and report back please

Just did. Using the same app for before and after.

When idle and the car is warm:

Before: 23-28 DB
After: 18-25 DB

As you can see the DB difference is not significant, but you can hear/feel that the car is isolated and the exhaust sound is toned down/muted.

Anyhow, I'm happy with the results and would recommend to anyone to isolate their trunk if they have noise issues. I would suggest cheaper solution than Dynamat, if you can find one.

Jayhovah · 07-16-2015, 09:51 AM

Quote:

Originally Posted by cranzy

Just did. Using the same app for before and after.

When idle and the car is warm:

Before: 23-28 DB
After: 18-25 DB

As you can see the DB difference is not significant, but you can hear/feel that the car is isolated and the exhaust sound is toned down/muted.

Anyhow, I'm happy with the results and would recommend to anyone to isolate their trunk if they have noise issues. I would suggest cheaper solution than Dynamat, if you can find one.

How about a road noise test?

cranzy · 07-16-2015, 12:55 PM

Quote:

Originally Posted by Jayhovah

How about a road noise test?

As cooltoy said, it's too late for that. However, I've applied dynamat only where most of the noise is coming from - trunk of the car. Road noise didn't bother me before, but I'm sure if you want to significantly reduce it, you'll have to take off the carpet, door panels, trunk panels and apply some form of isolation. As I said before, my exhaust noise in the car is more tamed right now.
Keep in mind I have stock headers, HFC, and the full Tomei exhaust. I can't wait to see what my car will sound with the Z1 headers and TPs.

07-09-2015, 06:27 AM	#2 (permalink)
scottIN Track Member Join Date: Aug 2011 Location: New Castle, Indiana Posts: 764 Drives: '12 370Z Rep Power: 55	Very clean. If you want quieter, go back and do the fenders. That's where a lot of the noise comes from. I used nearly 2 boxes of Dynomat. There is not an inch of bare metal showing from the seats back in mine. Silly Rabbit, moore.speed and cranzy like this.

07-10-2015, 03:08 PM	#4 (permalink)
darkphantom Enthusiast Member Join Date: Apr 2015 Location: Houston, Texas Posts: 425 Drives: 13 Z34 PW M6 Rep Power: 243	A side note, I noticed the noise from the fender area as well, not as much from the trunk side, can we get better fender wells/covering on the underside or is the CCF on the fenders the best bet? __________________ '13 PW M6 \| Takeda \| ARK GRiP V2 \| H&R

07-13-2015, 11:51 AM	#5 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,982 Drives: 14 PW 370Z S/T MT Rep Power: 243722	So what is the final dB measurement? __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

07-14-2015, 10:11 AM	#8 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 44 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684441	FWIW, I think the CCF is the stuff that will really affect dB readings. I borrowed a dB reader and the difference between my before and after readings was statistically insignificant with just the vibration dampener installed in my hatch. Even the difference between my before readings with the hatch completely bare and after with the Onyx installed and the spare tire and all panels put back in the hatch was very minimal. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

07-14-2015, 11:10 PM	#10 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,982 Drives: 14 PW 370Z S/T MT Rep Power: 243722	So an increase from 20 to 59? Love how they spelled breathing. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

07-08-2015, 11:06 PM	#1 (permalink)
cranzy Base Member Join Date: Mar 2015 Location: Seattle Posts: 108 Drives: 370z Rep Power: 11	Here is the final result. It helps; now I can have normal convo in my car

07-13-2015, 11:18 PM	#7 (permalink)
RyanWest Track Member Join Date: Jan 2012 Location: Tamp, Fl Posts: 714 Drives: 2009 Nissan Rep Power: 34	In for final before and after dB readings!

07-14-2015, 10:55 PM	#9 (permalink)
cranzy Base Member Join Date: Mar 2015 Location: Seattle Posts: 108 Drives: 370z Rep Power: 11	Here are the screen shot of the DB reader I took just for you peeps Btw this is not the same reader that I initially used, but it gives you a good hint for how noisy the car is now.

07-15-2015, 02:44 AM	#12 (permalink)
RyanWest Track Member Join Date: Jan 2012 Location: Tamp, Fl Posts: 714 Drives: 2009 Nissan Rep Power: 34	Use one app and report back please cooltoy likes this.

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