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> Chambered mufflers?
post Oct 17, 2005 - 12:48 PM
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dawnoforigin

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Is there any positive experience with these types of mufflers? I know most go with the straight through design, but I know they would be way too loud and not sound the way I would like. I also was considering this because I don't want to lose any low end power by getting a straight through design. Low end is much more important then high end to me. I was thinking about looking into a Dynomax Super Turbo or possibly a Flowmaster. Any input is appreciated.

http://www.dynomax.com/superturbo.stm
 
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post Oct 19, 2005 - 10:12 PM
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soulshadow



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AHHH all that stuff about backpressure and what not is causing my simple minded brain to explode!! PERIOD PERIOD!!!! Slap on a loud muffler and drive around. If you don't like it loud get a silencer (I can't even spell now Thanks a lot!). PERIOD PERIOD!!! confused.gif confused.gif confused.gif confused.gif
post Nov 26, 2005 - 12:05 PM
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RocketScott



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QUOTE(soulshadow @ Oct 19, 2005 - 7:12 PM) [snapback]346706[/snapback]

AHHH all that stuff about backpressure and what not is causing my simple minded brain to explode!! PERIOD PERIOD!!!! Slap on a loud muffler and drive around. If you don't like it loud get a silencer (I can't even spell now Thanks a lot!). PERIOD PERIOD!!! confused.gif confused.gif confused.gif confused.gif



Get ready for a complete mind melt because I'm going to explain something that most people don't consider let alone even know about: Resonance. The Celica actually has two resonators, one in the intake and one in the exhaust. Both intake and exhaust tracts act similarly in terms of resonance but each of them use resonance a little differently.

When a valve opens in the head a shock wave is produced because of the differential in pressure that exists between the inside of the combustion chamber and the intake/exhaust track. This shock wave is negative pressure and travels (at the speed of sound) all the way to the end of the tract where it meets the atmosphere. The pressure difference that it encounters there creates another shock wave, this time positive, which goes back down the tract until it reaches the valve again. If this positive shock wave hits the valve when it's open it will result in pushing whatever gases are in the tract into the cylinder. This is a good thing in the intake tract where you want more fuel/air mixture dumped into the cylinder. It's quit the opposite in the exhaust system where you want the gas in the cylinder sucked out. Therefore you want the pulse in the exhaust system to hit right before the valve opens so when it does the gases in the cylinder are sucked out or "scavenged" by the now leaving shock wave. The frequency at which this happens changes with the RPM. When an engine has a "flat spot" at a certain RPM this is a likely culprit.

I'm sure the engineers at Toyota spent countless hours designing the intake and exhaust tracts to be a good compromise between performance, economy, reliability, emissions, etc. When one part or another is changed from it messes with the resonance and possibly something else needs to be done to correct it if you want to maintain that stock compromise. Most of us don't so we give up a little economy or take some power away from one part of the horsepower curve and give it to another. What's important here is the volume of the given tract. If the exhaust diameter grows the increased volume of the pipe should come out of some other part in the system. This is an over simplification but I hope you get the picture.


Posts in this topic
- dawnoforigin   Chambered mufflers?   Oct 17, 2005 - 12:48 PM
- - soulshadow   The design looks the same as a flowmaster. Im pret...   Oct 17, 2005 - 4:51 PM
- - Bigmeanbulldog55   If your leaving your cat and resinater, a strate t...   Oct 17, 2005 - 4:59 PM
- - Boss-Celica   Even though this is a little off topic I was wonde...   Oct 17, 2005 - 5:37 PM
- - nowitzon   LOUD!!!! Leave the resonator on u ...   Oct 17, 2005 - 7:17 PM
- - Galcobar   Cars do not need backpressure -- it's a myth. ...   Oct 17, 2005 - 7:57 PM
- - Valo666   that muffler is soooooooo bloody loud. i had it on...   Oct 17, 2005 - 8:22 PM
- - Bigmeanbulldog55   If cars don't need backpressure, then how come...   Oct 17, 2005 - 8:25 PM
|- - Galcobar   QUOTE(Bigmeanbulldog55 @ Oct 17, 2005 - 6:25 ...   Oct 19, 2005 - 5:24 PM
- - playr158   na motors need a certain amount..... boosted doesn...   Oct 17, 2005 - 8:30 PM
- - soulshadow   Just get a 2.25 catback. It increased a lot of HP ...   Oct 17, 2005 - 11:00 PM
- - playr158   QUOTEIt increased a lot of HP or sounds like it PL...   Oct 17, 2005 - 11:47 PM
- - Bigmeanbulldog55   Noise could equal hp, if you hear the noise rising...   Oct 18, 2005 - 11:49 AM
|- - soulshadow   QUOTE(Bigmeanbulldog55 @ Oct 18, 2005 - 11:49...   Oct 18, 2005 - 4:15 PM
- - playr158   no noise does not equal horsepower..... my bov mak...   Oct 18, 2005 - 12:44 PM
- - 95CelicaST   You can slap on a couple sweet stickers brah and g...   Oct 18, 2005 - 2:50 PM
- - Bigmeanbulldog55   QUOTE(playr158 @ Oct 18, 2005 - 1:44 PM)no no...   Oct 18, 2005 - 2:56 PM
- - 95CelicaST   QUOTEAlways debated, the potential of a "fe...   Oct 18, 2005 - 3:39 PM
- - nowitzon   ok all i know is that the car is pulling harder no...   Oct 18, 2005 - 4:18 PM
- - Bigmeanbulldog55   QUOTE(95CelicaST @ Oct 18, 2005 - 3:50 PM)You...   Oct 18, 2005 - 5:46 PM
- - 95CelicaST   trying...   Oct 19, 2005 - 1:49 AM
- - soulshadow   AHHH all that stuff about backpressure and what no...   Oct 19, 2005 - 10:12 PM
|- - RocketScott   QUOTE(soulshadow @ Oct 19, 2005 - 7...   Nov 26, 2005 - 12:05 PM
- - Bigmeanbulldog55   Galcobar, you're telling me that and engine th...   Oct 19, 2005 - 11:11 PM
- - 95CelicaST   there wouldn't be backpressure w/o a manifold ...   Oct 20, 2005 - 11:22 AM
- - Galcobar   You'll note I never made any comments about ba...   Oct 20, 2005 - 3:28 PM
- - Predator   2-stroke engines on the other hand need backpressu...   Nov 25, 2005 - 4:57 PM
- - K-ESD   QUOTE(RocketScott @ Nov 26, 2005 - 2...   Jun 1, 2006 - 11:01 AM
- - BonzaiCelica   QUOTE (richee3 @ Oct 16, 2012 - 8:56...   Feb 6, 2013 - 3:10 PM
- - delusionz   i wish someone would eliminate the term back pres...   Feb 6, 2013 - 5:02 PM
- - delusionz   Also, to whoever says they lost power by freeing u...   Feb 6, 2013 - 5:07 PM
- - delusionz   Bonzai Its weird that anyone should have drone abo...   Feb 6, 2013 - 5:24 PM
- - BonzaiCelica   wait haha i totally type that wrong read it again ...   Feb 7, 2013 - 2:37 AM
|- - jordisonjr   QUOTE (BonzaiCelica @ Feb 7, 2013 - 3...   Feb 7, 2013 - 1:55 PM
- - mkernz22   I know that oscillating sound all too well...   Feb 7, 2013 - 2:02 PM
- - delusionz   To answer your questions, yes they will sound comp...   Feb 7, 2013 - 4:57 PM
- - mkernz22   As far as back pressure goes, I know our engines d...   Feb 7, 2013 - 5:17 PM
|- - Galcobar   QUOTE (mkernz22 @ Feb 7, 2013 - 3:17...   Feb 12, 2013 - 1:10 AM
- - TRDweaponX   What size is the exhaust pipe on a USDM 6th gen Ce...   Feb 11, 2013 - 10:06 PM
- - BonzaiCelica   QUOTE (TRDweaponX @ Feb 11, 2013 - 11...   Feb 12, 2013 - 2:28 AM


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