oem muffler dissection - Toyota Yaris Forums

larryn2o · 02-20-2011, 05:17 PM

i cut up a factory muffler this week , to see how it is made. it had 2 small "glasspak sections and a 180 bend in the pipe . not bad for flow. the bad part is a center divider with a small square door. it is spring loaded and was stuck almost shut. had to be beat open, this is after only 40,000 miles .

one could take a hole saw or large drill bit , make 1 hole in the rear of the muffler and perforate the divider to gain more flow. then patch the out side for a stock appearance.

cali yaris · 02-20-2011, 05:31 PM

cool. glad someone did that so we could all see!

yaris2010RS · 02-20-2011, 07:00 PM

lol? u did that at work? i recongnize the rollers on the work bench, lol

i have been planning to open mine up and basically gut it out to get a little deeper sound, does it look possible/practical?

auxmike · 02-20-2011, 07:28 PM

What's the deal with the hatch then?
Will the car still run if the hatch jams shut?

RedRide · 02-20-2011, 08:27 PM

Interesting.
I was wondering what was inside one of those.
Thanks for posting it.

larryn2o · 02-20-2011, 09:03 PM

there is a small gap in the in-feed tube so that it can flow with the door closed. you could take a hole saw and drill from the top. if placed right it would sever the outlet tube, and eliminate the trap door. that would make it a single chamber muffler.

larryn2o · 02-20-2011, 09:17 PM

Quote:

Originally Posted by yaris2010RS

lol? u did that at work? i recongnize the rollers on the work bench, lol

i have been planning to open mine up and basically gut it out to get a little deeper sound, does it look possible/practical?

if you cut it open ,stay to the back side (rear)of the seam , the center partition is welded to the pipes and outer case. you could cut a 3 inch hole in the partition and weld in a racing header insert. this would make the equivalent of a turbo muffler.

http://www.summitracing.com/parts/SCH-42530/

Bluevitz-rs · 02-20-2011, 11:23 PM

That trap door is supposed to be a performance thing. It's shut to keep the car quiet and maintain back pressure, but when you floor it the pressure is supposed to open it up allowing better flow at the expense of more sound. It's a pretty good setup when it works for a stock muffler.

yaris2010RS · 02-20-2011, 11:31 PM

Quote:

Originally Posted by Bluevitz-rs

That trap door is supposed to be a performance thing. It's shut to keep the car quiet and maintain back pressure, but when you floor it the pressure is supposed to open it up allowing better flow at the expense of more sound. It's a pretty good setup when it works for a stock muffler.

when it works? lol how do we know if it works or if its failing?

Bluevitz-rs · 02-20-2011, 11:55 PM

I'm just going off of the OP saying his was jammed shut. I'm sure it'll work forever on a regularly used muffler.

RedRide · 02-21-2011, 12:40 AM

Another reason to go for WOT often.

yaris2010RS · 02-21-2011, 12:47 AM

im sure mine isnt stuck, i life at WOT and still get amazing fuel economy considering

RedRide · 02-21-2011, 01:02 AM

Quote:

Originally Posted by yaris2010RS

im sure mine isnt stuck, i life at WOT and still get amazing fuel economy considering

Exactly.
Even at its worse, the Yaris still gets great milage.
You might as well enjoy what you're driving.

detroiter · 02-21-2011, 01:24 AM

My yaris seems to like to suck down the gas if I jam on the gas pedal too much at WOT :(

yaris2010RS · 02-21-2011, 01:41 AM

what do u mean by "suck down the gas"? i drive my car exactly like how any insurance company thinks a 19y/o male would :) and i still get around 500 - 550km (340mi)per tank winter and 600 - 650km (400mi)per tank summer, i cant complain

malibuguy · 02-21-2011, 11:37 AM

nice to know whats inside

its kinda like a DynoMax VT muffler

detroiter · 02-21-2011, 12:41 PM

Sucks down like if you were driving a triton v8 Ford engined vehicle and romping on it. Maybe it doesn't suck gas down that bad but I still get pretty dismal mileage and can't figure it out :(

06silveryaris · 02-23-2011, 08:18 PM

if you cut the loop and connect it directly to exit glass pack it will sound nice. This is one I made for a buddy of mine

http://www.youtube.com/watch?v=gIec-3LFs_A

02-20-2011, 05:31 PM	#2
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	cool. glad someone did that so we could all see! __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

02-20-2011, 07:00 PM	#3
yaris2010RS View User's Garage Drives: no-longer-boosted '10 Yaris Join Date: Nov 2009 Location: Angus, Ontario Posts: 1,891	lol? u did that at work? i recongnize the rollers on the work bench, lol i have been planning to open mine up and basically gut it out to get a little deeper sound, does it look possible/practical? __________________ If it has boobs or wheels sooner or later your gonna have problems with it

02-20-2011, 07:28 PM	#4
auxmike Drives: 2008 HB, A/T, Power W/L/M Join Date: Oct 2008 Location: LI, New Yawk Posts: 2,063	What's the deal with the hatch then? Will the car still run if the hatch jams shut? __________________ Never take eyes off opponent - Bruce Lee

02-20-2011, 09:03 PM	#6
larryn2o Drives: 08 yaris Join Date: Nov 2010 Location: MS Posts: 51	there is a small gap in the in-feed tube so that it can flow with the door closed. you could take a hole saw and drill from the top. if placed right it would sever the outlet tube, and eliminate the trap door. that would make it a single chamber muffler. __________________ http://www.youtube.com/watch?v=izq4B5Q5oLQ http://www.youtube.com/watch?v=_pvT1QTy9WI http://www.youtube.com/watch?v=PYf5W9CLQ1I

02-21-2011, 12:47 AM	#12
yaris2010RS View User's Garage Drives: no-longer-boosted '10 Yaris Join Date: Nov 2009 Location: Angus, Ontario Posts: 1,891	im sure mine isnt stuck, i life at WOT and still get amazing fuel economy considering __________________ If it has boobs or wheels sooner or later your gonna have problems with it

02-20-2011, 08:27 PM	#5
RedRide Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009 Location: Middletown, NY Posts: 1,501	Interesting. I was wondering what was inside one of those. Thanks for posting it.

02-20-2011, 11:23 PM	#8
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	That trap door is supposed to be a performance thing. It's shut to keep the car quiet and maintain back pressure, but when you floor it the pressure is supposed to open it up allowing better flow at the expense of more sound. It's a pretty good setup when it works for a stock muffler.

02-20-2011, 11:55 PM	#10
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	I'm just going off of the OP saying his was jammed shut. I'm sure it'll work forever on a regularly used muffler.

02-21-2011, 12:40 AM	#11
RedRide Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009 Location: Middletown, NY Posts: 1,501	Another reason to go for WOT often.

02-21-2011, 01:24 AM	#14
detroiter Drives: 2008 Polar White LB Auto Join Date: Oct 2008 Location: Metro Detroit Posts: 1,238	My yaris seems to like to suck down the gas if I jam on the gas pedal too much at WOT :( __________________ I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

02-21-2011, 01:41 AM	#15
yaris2010RS View User's Garage Drives: no-longer-boosted '10 Yaris Join Date: Nov 2009 Location: Angus, Ontario Posts: 1,891	what do u mean by "suck down the gas"? i drive my car exactly like how any insurance company thinks a 19y/o male would :) and i still get around 500 - 550km (340mi)per tank winter and 600 - 650km (400mi)per tank summer, i cant complain __________________ If it has boobs or wheels sooner or later your gonna have problems with it

02-21-2011, 11:37 AM	#16
malibuguy Obsessed with 1.5L Drives: '10 PW Yaris Sedan Join Date: Feb 2011 Location: Westminster, MD Posts: 907	nice to know whats inside its kinda like a DynoMax VT muffler __________________ -Greg...the Exhaust Freak. -10 PW sedan 107whp/110wtq, full exhaust, suspension bits, TRD LSD -06 Highlander 3mzfe Limited AWD -82 Malibu, 1uzfe swap -97 Tercel coupe, 1nzfe/4.31 -96 Tercel coupe, Turbo 5efe, autoX -96 Tercel 4dr

02-21-2011, 12:41 PM	#17
detroiter Drives: 2008 Polar White LB Auto Join Date: Oct 2008 Location: Metro Detroit Posts: 1,238	Sucks down like if you were driving a triton v8 Ford engined vehicle and romping on it. Maybe it doesn't suck gas down that bad but I still get pretty dismal mileage and can't figure it out :( __________________ I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

02-23-2011, 08:18 PM	#18
06silveryaris Drives: 2006 yaris Join Date: Oct 2008 Location: Puerto Rico Posts: 536	if you cut the loop and connect it directly to exit glass pack it will sound nice. This is one I made for a buddy of mine http://www.youtube.com/watch?v=gIec-3LFs_A

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
TRD Muffler	Keith Tinari	Items for Sale by private party	20	01-31-2010 10:47 PM
OEM Parts	hatchbackkid82	Items for Sale by private party	30	12-17-2009 10:08 AM
Rusty Muffler	dadi_oh	Cosmetic Modifications (Exterior/Interior)	7	07-03-2009 08:45 PM
FS: OEM STUFF	darkmoon87	Items for Sale by private party	2	05-29-2009 05:21 AM
Rusty Muffler Hangers	YAR1S	General Yaris / Vitz Discussion	14	10-24-2008 07:22 PM