Analog solution to cold-start house-shake - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

WNDSRFR · 11-12-2014, 03:06 PM

I've had my OFH and Manzo cat-back for awhile now. I love the sound they make going down the road. But I don't like the sound they make in my garage first thing in the morning. And neither do my neighbors. The noise only lasts for about a minute but that's long enough to piss off a lot of people. It shakes the house so bad that the ceiling in my garage actually collapsed onto my car. It didn't do too much damage (to the car) but that was the last straw.

WNDSRFR · 11-12-2014, 03:11 PM

Something had to be done.
So I decided to try the brute force approach. How about using fiberglass insulation as a muffler?
So I got a chunk of insulation and put it up against a backstop.

WNDSRFR · 11-12-2014, 03:14 PM

Then I just back up into the insulation until it is well compressed. It acts as a very nice soft stop.

WNDSRFR · 11-12-2014, 03:15 PM

It doesn't silence it completely but it does stop the house from shaking.

ATL BRZ · 11-12-2014, 03:17 PM

Quote:

Originally Posted by WNDSRFR

It doesn't silence it completely but it does stop the house from shaking.

The car is loud because it's dumping fuel with lots of ignition retard on a cold start to warm up the cats.

The way you're parked now may be the reason the house shakes so bad. The sound resonates even more off the back wall and the sides with the exhaust facing the back wall.

It may be better if you parked your car in the other direction with the exhaust tips facing outside.

WNDSRFR · 11-12-2014, 03:20 PM

Quote:

Originally Posted by ATL BRZ

The car is loud because it's dumping fuel on a cold start to warm up the cats. It may be slightly better if you parked your car in the other direction with the exhaust tips facing outside. The way you're parked now is just making the sound resonate even more off the back wall.

That's the way I used to park. With the exhaust facing the door. That's the reason why the ceiling collapsed where it did. but I had to keep the door closed while the car warmed up otherwise my neighbors would call the police. I mean it is loud.

Kevstra · 11-12-2014, 03:27 PM

This thread made me laugh so hard...

DAEMANO · 11-12-2014, 03:31 PM

Have you tried putting a banana in your tailpipe?

radroach · 11-12-2014, 03:51 PM

Could this cause your engine to run rich and backfire?

Insulating your startup noise is a great idea IMO, but I think we can help come up with a few other solutions for you.

Perhaps keep the same insulation setup, but cut a couple holes and add an insulated tube to let some exhaust out?

AdrianG · 11-12-2014, 04:20 PM

Why not just make the changes to the engine map?

- AdrianG

s2d4 · 11-12-2014, 04:52 PM

ohh boy....

Foobar · 11-12-2014, 05:01 PM

Do you not have the means to tweak your tune instead of baffling your tailpipes? I mean I get that this is the non-digital solution, but why can't it be digital? That fiberglass insulation is going to micro-scratch the hell out of your bumper over time.

Sent from my Nexus 5 using Tapatalk

youcantseeme24 · 11-12-2014, 07:49 PM

What about some sort of sound tube from the tail pipe. Similar to the effects of the one in the intake.

Struckbylitenin · 11-12-2014, 08:11 PM

the fumes; where they at doe?

11-12-2014, 03:06 PM	#1
WNDSRFR Senior Member Join Date: Jan 2014 Drives: FR-S,GTI Location: Cocoa, Florida Posts: 1,189 Thanks: 235 Thanked 868 Times in 442 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Analog solution to cold-start house-shake I've had my OFH and Manzo cat-back for awhile now. I love the sound they make going down the road. But I don't like the sound they make in my garage first thing in the morning. And neither do my neighbors. The noise only lasts for about a minute but that's long enough to piss off a lot of people. It shakes the house so bad that the ceiling in my garage actually collapsed onto my car. It didn't do too much damage (to the car) but that was the last straw. Attached Images

11-12-2014, 03:11 PM	#2
WNDSRFR Senior Member Join Date: Jan 2014 Drives: FR-S,GTI Location: Cocoa, Florida Posts: 1,189 Thanks: 235 Thanked 868 Times in 442 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Something had to be done. So I decided to try the brute force approach. How about using fiberglass insulation as a muffler? So I got a chunk of insulation and put it up against a backstop. Attached Images

11-12-2014, 03:14 PM	#3
WNDSRFR Senior Member Join Date: Jan 2014 Drives: FR-S,GTI Location: Cocoa, Florida Posts: 1,189 Thanks: 235 Thanked 868 Times in 442 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Then I just back up into the insulation until it is well compressed. It acts as a very nice soft stop. Attached Images

11-12-2014, 04:52 PM	#11
s2d4 Senior Member Join Date: Mar 2013 Drives: R32 GTR, AW11 MR2 SC, GTS86 R Location: OZ Posts: 2,615 Thanks: 603 Thanked 1,224 Times in 708 Posts Mentioned: 35 Post(s) Tagged: 0 Thread(s)	ohh boy.... __________________

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11-12-2014, 03:15 PM	#4
WNDSRFR Senior Member Join Date: Jan 2014 Drives: FR-S,GTI Location: Cocoa, Florida Posts: 1,189 Thanks: 235 Thanked 868 Times in 442 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	It doesn't silence it completely but it does stop the house from shaking.

11-12-2014, 03:51 PM	#9
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	Could this cause your engine to run rich and backfire? Insulating your startup noise is a great idea IMO, but I think we can help come up with a few other solutions for you. Perhaps keep the same insulation setup, but cut a couple holes and add an insulated tube to let some exhaust out?

11-12-2014, 04:20 PM	#10
AdrianG Generally Well Liked Join Date: Aug 2013 Drives: '08 STi Hatch, '11 Outback 3.6R Location: Ontario Posts: 419 Thanks: 43 Thanked 197 Times in 125 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Why not just make the changes to the engine map? - AdrianG

11-12-2014, 07:49 PM	#13
youcantseeme24 Senior Member Join Date: Aug 2012 Drives: 2013 subaru brz Location: United States Posts: 136 Thanks: 102 Thanked 42 Times in 29 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	What about some sort of sound tube from the tail pipe. Similar to the effects of the one in the intake.

11-12-2014, 08:11 PM	#14
Struckbylitenin Senior Member Join Date: Aug 2013 Drives: 10 Series FR-S Location: S. Jerz / Philly Posts: 254 Thanks: 41 Thanked 121 Times in 67 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	the fumes; where they at doe?

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