Dampening exhaust sound in garage. Need creative solutions!

bplourde · 10-05-2010, 12:07 PM

So my predicament is that I live in a 2-family home with the neighbors sleeping directly above my side of the garage. I have a newly installed FI cat-back + high-flow cats, and I leave at 6:00AM each morning to drive to work.

Because the Z runs "louder" for the first 30 seconds or so while it warms up, let's just say there's no possible way my neighbors are still sleeping once I push that red GT-R start button

Thoughts for being more courteous? I was thinking of buying some insulating foam and lining a couple of 5-10 gallon buckets that I could situate so they sit behind my car in front of the mufflers. Think that would deaden the sound enough while it warms up for 30s? At warmed-up idle it's not loud at all.

My current approach is to move as fast as possible to start the car and get it on the road away from the house haha.

tjlazer · 10-05-2010, 12:31 PM

Dynamat the whole garage. LOL

I hear ya. My GF tells me she feels sorry for my neighbors when I pull off to go to work, especially on the weekends. :P

wishihadnav · 10-05-2010, 12:40 PM

buy one of these and you should be good..

CC Inserts™ - Exhaust Sound Suppression Inserts

m4a1mustang · 10-05-2010, 12:41 PM

Push the car out of the garage, jump in, and start.

I did this once but it was on accident.

SoCal 370Z · 10-05-2010, 12:43 PM

QuietRock
You must adhere to building codes as it pertains to garage spaces, so please review what you intend to do with your local Building Department. Much of it has to do with fire ratings.

CBRich · 10-05-2010, 03:17 PM

Home Theater Acoustical Wall Paneling Fabric

ProfessorDave · 10-05-2010, 05:13 PM

Do you open the garage door first? I'm assuming you do, not wanting to suffocate! That actually helps alot, in that the sound can travel out instead of bouncing around in the garage.

And yeah, the first minute after and FI start up is LOUD!

XwChriswX · 10-05-2010, 05:22 PM

Why not just park it on the driveway, not in the garage... or does your garage open directly to the street?

oreoleo · 10-05-2010, 06:27 PM

I have the same problem with my invidia gemini and hfc. I park with the mufflers facing the street, and push the car out of the garage about 5 feet. Kind of a hassle. I tried shoving steel wool in the mufflers, but they shot right out. I need to think of something that will hold them in place temporarily.

XwChriswX · 10-05-2010, 06:42 PM

Try using some the blue painters tape after you put the steel wool in...

(X) <== Put it in an X over the end of the pipe, crank, idle, and pull it off, won't leave any adhesive residue on the piping...

oreoleo · 10-05-2010, 06:52 PM

@XwChriswX - Why didn't I think of that, duct tape is the solution for any problem.
I gotta go to home depot / lowe's and buy some wool, since I lost the last pieces I had.
I'm guessing the more wool = less noise.

Duct tape- Put it in your pocket save it for later. lol

kenchan · 10-06-2010, 03:50 PM

Quote:

Originally Posted by oreoleo

I tried shoving steel wool in the mufflers, but they shot right out.

Nikon FM · 10-06-2010, 07:07 PM

Quote:

Originally Posted by bplourde

So my predicament is that I live in a 2-family home with the neighbors sleeping directly above my side of the garage. I have a newly installed FI cat-back + high-flow cats, and I leave at 6:00AM each morning to drive to work.

Because the Z runs "louder" for the first 30 seconds or so while it warms up, let's just say there's no possible way my neighbors are still sleeping once I push that red GT-R start button

Thoughts for being more courteous? I was thinking of buying some insulating foam and lining a couple of 5-10 gallon buckets that I could situate so they sit behind my car in front of the mufflers. Think that would deaden the sound enough while it warms up for 30s? At warmed-up idle it's not loud at all.

My current approach is to move as fast as possible to start the car and get it on the road away from the house haha.

The exhaust noise is predominately low frequency noise so is best attenuated using mass. The best solution would be to isolate a second set of panels by using damping that is effective for lower frequencies at temperatures your garage is typically at. Putting fiberglass/foam on the wall panels will help mostly with mid to higher frequency noise. If you are likely to buy some "acoustic panels" check the specifications to determine how much loss will occur in the 40-200Hz frequency range. If you were to back your car up slightly so that sound is not reflected back into your garage that would help quite a bit.

fairladyZ34 · 10-06-2010, 08:42 PM

egg cartons as long as they are sprayed with a fire retardent

Zsteve · 10-06-2010, 09:38 PM

push it outside and then start it

10-05-2010, 12:07 PM	#1 (permalink)
bplourde Base Member Join Date: Apr 2010 Location: Boston Posts: 16 Drives: 2010 370Z 40th Rep Power: 15	Dampening exhaust sound in garage. Need creative solutions! So my predicament is that I live in a 2-family home with the neighbors sleeping directly above my side of the garage. I have a newly installed FI cat-back + high-flow cats, and I leave at 6:00AM each morning to drive to work. Because the Z runs "louder" for the first 30 seconds or so while it warms up, let's just say there's no possible way my neighbors are still sleeping once I push that red GT-R start button Thoughts for being more courteous? I was thinking of buying some insulating foam and lining a couple of 5-10 gallon buckets that I could situate so they sit behind my car in front of the mufflers. Think that would deaden the sound enough while it warms up for 30s? At warmed-up idle it's not loud at all. My current approach is to move as fast as possible to start the car and get it on the road away from the house haha.

10-05-2010, 12:31 PM	#2 (permalink)
tjlazer A True Z Fanatic Join Date: Dec 2009 Location: Tacoma Age: 53 Posts: 2,496 Drives: Z34, R35 Rep Power: 19	Dynamat the whole garage. LOL I hear ya. My GF tells me she feels sorry for my neighbors when I pull off to go to work, especially on the weekends. :P __________________ 2009 370Z Monterey Blue,Nismo Conversion,RE-11's, K&N Typhoon intakes,Blue Kickplates,Homelink,FI 18" CBE,ERZ HFCs,Hotchkis sways, Swift Spec-R, EVO-R Highwing, UPREV

10-05-2010, 12:41 PM	#4 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	Push the car out of the garage, jump in, and start. I did this once but it was on accident. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

10-05-2010, 12:43 PM	#5 (permalink)
SoCal 370Z A True Z Fanatic Join Date: Feb 2009 Location: US of A Posts: 2,842 Drives: Answers Rep Power: 33	QuietRock You must adhere to building codes as it pertains to garage spaces, so please review what you intend to do with your local Building Department. Much of it has to do with fire ratings. __________________ ( Click to show/hide ) Why I NEVER say NO to the Panda Lou Fusz!!!

10-05-2010, 05:13 PM	#7 (permalink)
ProfessorDave A True Z Fanatic Join Date: Jul 2010 Location: Scranton, PA Posts: 1,580 Drives: In the fairway Rep Power: 19	Do you open the garage door first? I'm assuming you do, not wanting to suffocate! That actually helps alot, in that the sound can travel out instead of bouncing around in the garage. And yeah, the first minute after and FI start up is LOUD! __________________ Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB Everything else: 2009 370z, PW Touring 6MT

10-05-2010, 12:40 PM	#3 (permalink)
wishihadnav A True Z Fanatic Join Date: Nov 2009 Location: 90090 Posts: 1,851 Drives: Force Fed Nismo Rep Power: 184	buy one of these and you should be good.. CC Inserts™ - Exhaust Sound Suppression Inserts

10-05-2010, 03:17 PM	#6 (permalink)
CBRich A True Z Fanatic Join Date: Apr 2009 Location: SC Posts: 2,464 Drives: 370Z Rep Power: 544	Home Theater Acoustical Wall Paneling Fabric

10-05-2010, 05:22 PM	#8 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	Why not just park it on the driveway, not in the garage... or does your garage open directly to the street? __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

10-05-2010, 06:27 PM	#9 (permalink)
oreoleo Base Member Join Date: Jan 2010 Location: Philadelphia PA Posts: 54 Drives: 09 Infiniti G37S 6MT Rep Power: 15	I have the same problem with my invidia gemini and hfc. I park with the mufflers facing the street, and push the car out of the garage about 5 feet. Kind of a hassle. I tried shoving steel wool in the mufflers, but they shot right out. I need to think of something that will hold them in place temporarily. __________________ '09 6mtS OB Coupe\|KW V3\|SPC\|Stillen 3G\|Invidia Gemini CB+HFC\|Nismo S/S\|Hotchkis

10-05-2010, 06:42 PM	#10 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	Try using some the blue painters tape after you put the steel wool in... (X) <== Put it in an X over the end of the pipe, crank, idle, and pull it off, won't leave any adhesive residue on the piping... __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

10-05-2010, 06:52 PM	#11 (permalink)
oreoleo Base Member Join Date: Jan 2010 Location: Philadelphia PA Posts: 54 Drives: 09 Infiniti G37S 6MT Rep Power: 15	@XwChriswX - Why didn't I think of that, duct tape is the solution for any problem. I gotta go to home depot / lowe's and buy some wool, since I lost the last pieces I had. I'm guessing the more wool = less noise. Duct tape- Put it in your pocket save it for later. lol __________________ '09 6mtS OB Coupe\|KW V3\|SPC\|Stillen 3G\|Invidia Gemini CB+HFC\|Nismo S/S\|Hotchkis

10-06-2010, 08:42 PM	#14 (permalink)
fairladyZ34 A True Z Fanatic Join Date: Aug 2009 Location: Central NJ Posts: 1,577 Drives: 08 G37S Black M6 Rep Power: 19	egg cartons as long as they are sprayed with a fire retardent __________________ From Z to G to BMW and back to a G! Nismo for life

10-06-2010, 09:38 PM	#15 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 22	push it outside and then start it __________________ 2010 LS3 C6 Silver coupe corvette

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