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09-30-2017, 07:32 AM | #1 |
Drives: 06 2ZR Turbo Yaris RS Join Date: Aug 2017
Location: Fredericton, New Brunswick, Canada
Posts: 2,384
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Please help with exhaust
I had some exhaust work done when the header was replaced. I have tried to recreate what the exhaust system looks like now as compared to what I think was there originally. As you can see, a long cylindrical section (part B in my diagram) was eliminated and another part ( Part A, resonator?) moved further rearward. I am not sure what these parts are. My exhaust is going in for a leak and a section of the rearward pipe is being replaced. I have a current code P0420 and a Toyota dealer hs said that it can occur with an exhaust leak anywhere in the system, even much farther downstream. I had had a P0137 O2 sensor circuit low voltage and I replaced the sensor. I now have fluctuating voltages and have read that it is supposed to be steady voltage for the downstream sensor. The P0137 is gone but now I have the P0420 code Catalyst system efficiency below threshold
I am not really sure how to proceed. I think I should replace the pipe section I got and have and be sure there are no other leaks. I can do this by having someone hold their hand over tailpipe and lsiten for leaks. I found one using this method. If my P0420 code does not go away, I planned to use the anti-fouler spark plug trick to eliminate the P0420 code. Air/fuel ratios are good, so I don't think it is having any adverse effect on my engine. Fuel economy is great as is power. My question is that at least one part (cylinder shaped - resonator?) was removed and I'm wondering if this is causing my engine light (P0420) code. What is the name of the long cylindrical part that was removed from my exhaust system in my picture? If I get my new pipe section installed and make sure all the leaks are eliminated, am I on the right track? I think that replacing the entire front pipe would be the proper way to go, but that would be super expensive. Can you please tell me definitively what parts A and B are in my labeled image?
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2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer https://www.instagram.com/2zr_turbo_yarisrs/ Last edited by 06YarisRS; 09-30-2017 at 07:45 AM. |
09-30-2017, 08:03 AM | #2 |
Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008
Location: Georgetown, Ontario, Canada
Posts: 5,762
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You have removed the resonator and shifted the secondary cat.
Sent from my Elite_5_5_Octa using Tapatalk
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09-30-2017, 08:51 AM | #3 |
Just a Gaijin
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Bare in mind that without a resonator (Part B) you might get some nasty frequencies that lead to loud buzzing and droning which can get really annoying over time.
I found a good explaination between the difference between a muffler and a resonator on the internet: Mufflers: Lowers sound level Usually packed with fiberglass Does not eliminate certain frequencies of sound (droning) Increases engine back pressure, hampering performance Resonators: Almost straight pipe sound level Cancels certain frequencies to stop droning and obnoxious noise Not adjustable at all, you either like it or you dont Decreases engine back pressure, increasing performance |
09-30-2017, 03:10 PM | #4 |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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you could remove both A and B and it will have no effect on computer fault codes. the statement "mufflers:...increases engine back pressure, hampering performance" is quite the misnomer. you might gain 1hp from removal. might...
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09-30-2017, 03:19 PM | #5 |
Just a Gaijin
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I got it from a Mustang Page. With small 4 cylinder engine you won't gain much power obviously.
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09-30-2017, 08:53 PM | #6 |
Drives: 06 2ZR Turbo Yaris RS Join Date: Aug 2017
Location: Fredericton, New Brunswick, Canada
Posts: 2,384
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Thanks! Not what I would have preferred. This was done by the exhaust guy.
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2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer https://www.instagram.com/2zr_turbo_yarisrs/ |
09-30-2017, 08:58 PM | #7 | |
Drives: 06 2ZR Turbo Yaris RS Join Date: Aug 2017
Location: Fredericton, New Brunswick, Canada
Posts: 2,384
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Quote:
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2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer https://www.instagram.com/2zr_turbo_yarisrs/ |
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09-30-2017, 09:00 PM | #8 |
Drives: 06 2ZR Turbo Yaris RS Join Date: Aug 2017
Location: Fredericton, New Brunswick, Canada
Posts: 2,384
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Thanks, SirDigby. I have no interest in increasing horsepower. I only want my exhaust to sound stock, or as close to that as possible. I'm a little disappointed that the resonator was removed, but I'm guessing it must have been in hard shape, otherwise he would not have removed it.
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2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer https://www.instagram.com/2zr_turbo_yarisrs/ |
10-02-2017, 08:34 AM | #9 |
Obsessed with 1.5L
Drives: '10 PW Yaris Sedan Join Date: Feb 2011
Location: Westminster, MD
Posts: 907
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Doesnt matter what motor it is...changing the muffler can make a large difference. Its all up to the original design. On a yaris with stock midpjpe...there aint much to be gained. But when you do the whole system...they pick up ALOT. My car in particular makes 107/110 at the wheels with a header, full custom exhaust, tooter spacer and a SRI.
No all mufflers have fiberglass nor restrictive. There is so many different designs out there. Some use rockwool. Some use ceramic filler. Some are baffled, some have multiple tubes. Late model toyotas are especially sensitive to throwing a p0420. Your secondary cat and resonator (that was deleted) have no influence on that code. Also the downstream o2 sensor should fluctuate...thats perfectly normal operation. I would check you donut connection at the header/manifold. Make sure the gasket/donut is in good shape...if not replace with a genuine toyota part. Most aftermarket ones are too soft and wear out fast...or not fit right. Make sure the spring bolts are in place which allow for engine movement. Next is the primary cat original? It could be worn out if you got high mileage. If it was replaced...it would need to be replaced with a heavy loaded converter. Most standard converters do not do as much as stock and will throw a code. Or you can space out the rear o2. I run a 100cell metal core race unit on mine with a spacer.
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-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 |
10-02-2017, 05:50 PM | #10 | |
Drives: 06 2ZR Turbo Yaris RS Join Date: Aug 2017
Location: Fredericton, New Brunswick, Canada
Posts: 2,384
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Quote:
Before, I had him replace my manifold as the flange was completely rusted off. He used a new gasket that I provided him with as well as new springs and bolts. On a positive note, moving the rear 02 sensor back out of the flow with a couple of sparkplug defoulers eliminated my P0420 code. Going on 2 days now with no MIL. I couldn't go more than 15 - 20 minutes without the code reappearing before the sparkplug defouler trick.
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2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer https://www.instagram.com/2zr_turbo_yarisrs/ |
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10-03-2017, 12:04 PM | #11 |
Drives: 2016 Yaris 3 Dr Super White Join Date: Mar 2016
Location: SoFloYo
Posts: 259
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I have a question pertaining to exhaust mods but its in a little different direction. How would performance be affected if you left the primary cat, the resonator, and installed a high flow muffler upstream?
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