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Noticed today I only have exhaust coming out one of the muffler pipes, WTF?

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Old 03-26-2006, 11:36 AM
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Noticed today I only have exhaust coming out one of the muffler pipes, WTF?
Ok sorry I dont post much just lurk, I noticed today that when my car is running I only get exhaust coming out of one of the pipes off the stock muffler, the passenger side pipe. What the heck? Does this mean that the muffler is blocked or fried or what? Anythoughts?

Thanks guys!
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Old 03-26-2006, 11:41 AM
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the maxima actually has an ingenius chambered exhaust...at low rpms only one pipe is "open," so some backpressure remains. Under heavy load/WOT, a little "flap" opens and then both pipes have exhaust coming out.
perfectly normal.
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Old 03-26-2006, 11:42 AM
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Originally Posted by irish44j
the maxima actually has an ingenius chambered exhaust...at low rpms only one pipe is "open," so some backpressure remains. Under heavy load/WOT, a little "flap" opens and then both pipes have exhaust coming out.
perfectly normal.
Uh oh! Backpressure!? Aren't you thinking of exhaust velocity?
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Old 03-26-2006, 11:43 AM
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Originally Posted by irish44j
the maxima actually has an ingenius chambered exhaust...at low rpms only one pipe is "open," so some backpressure remains. Under heavy load/WOT, a little "flap" opens and then both pipes have exhaust coming out.
perfectly normal.
.............
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Old 03-26-2006, 11:47 AM
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Originally Posted by irish44j
the maxima actually has an ingenius chambered exhaust...at low rpms only one pipe is "open," so some backpressure remains. Under heavy load/WOT, a little "flap" opens and then both pipes have exhaust coming out.
perfectly normal.
Ahhh thank you my good man. I do believe that this is the fastest response I have ever gotten here, perhaps the crowd has changed in the last few years. I cant believe I have been here over 2 years and dont even have 200 posts.

Secretly I was hoping you were going to tell me it was fried and I would "have" to go out and get a new flowmaster or something of that nature.
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Old 03-26-2006, 11:48 AM
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Originally Posted by Progress
Uh oh! Backpressure!? Aren't you thinking of exhaust velocity?
Explaining things in layman's terms is the easiest course of action, in my opinion. "Backpressure" is a widely-used (mis)nomer, but is more useful for explaining basic exhaust q's than getting into the whole "exhaust velocity" discussion for the 600th time.....
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Old 03-26-2006, 12:13 PM
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Originally Posted by irish44j
the maxima actually has an ingenius chambered exhaust...at low rpms only one pipe is "open," so some backpressure remains. Under heavy load/WOT, a little "flap" opens and then both pipes have exhaust coming out.
perfectly normal.

Yeah I remember seeing a link somewhere on these pages to a nissan site that had a little tutorial on how this worked, I was pretty impressed.
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Old 03-26-2006, 12:21 PM
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Hey irish..How do you find all these things out?...I've seen my Maxima do that, and just thought that the left pipe was for breathing of some sort..go figure!
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Old 03-26-2006, 12:25 PM
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Just curious, how can exhaust velocity in the manifold be increased by abstracting the flow far a way in the muffler? It seems like all it would do is create more back-pressure.
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Old 03-26-2006, 12:46 PM
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Klop...SEARCH, FTW!
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Old 03-26-2006, 01:03 PM
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Originally Posted by irish44j
Klop...SEARCH, FTW!
It's not that I really need to know that. Since conversation was already started... I figured I might as well ask, just out of curiosity.

Well, I guess I will search...
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Old 03-26-2006, 01:29 PM
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F1 handling baby!

thats cool, you finally dished out the donation fee...welcome
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Old 03-26-2006, 01:44 PM
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Originally Posted by steven88
F1 handling baby!

thats cool, you finally dished out the donation fee...welcome
had to come up with something original...

thanks bro!
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Old 03-26-2006, 02:49 PM
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So irish.......How do you find these things out? You didn't design the car.
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Old 03-26-2006, 03:07 PM
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Because he is all knowing about everything... Just ask him a question.










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Old 03-26-2006, 03:13 PM
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Originally Posted by Park2670
Because he is all knowing about everything... Just ask him a question.
Let's not exaggerate here, I most certainly don't know the cosine of the square root of 345,326,166,321 to the 5th power.

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Old 03-26-2006, 03:21 PM
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I get exhaust out of both my tips.... But I have a Cattman
I have seen the flap in many cars. Its in all my cars at work too
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Old 03-26-2006, 03:21 PM
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Klop..As you learn more about engines you will be amazed at what effect different things can have on different aspect of a engine. I'll give you a good example of something you have most likely seen but didn't realize it can add up to 5HP. Look at the exhaust pipe on some cars you will notice they have a half circle cut in them. Some are even cut at an angle. This has an effect on the pulse wave from the exhaust and does effect flow. On some GM cars it adds about 5HP. It's amazing stuff.

Irish... I would like to know if you don't mind a little more about how this extra valve/flap in the muffler works. Is it mech. or what...?
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Old 03-26-2006, 03:50 PM
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from an old article:

a new variable capacity muffler derived from the one on the high performance Nissan Skyline GT-R. A special muffler flap valve, using high temperature aerospace spring technology and materials, opens at 2,000 rpm and above – reducing exhaust system backpressure
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Old 03-26-2006, 04:02 PM
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Originally Posted by bpe383
Is it mech. or what...?
gatta be mechanical... there aren't any wires going to it. There's probably some kind off valve which is opened by exhaust pressure when it exceeds certain point.
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Old 03-26-2006, 04:34 PM
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Originally Posted by irish44j
Let's not exaggerate here, I most certainly don't know the cosine of the square root of 345,326,166,321 to the 5th power.

I got your back Irish

-0.0000056772653603822003180230482446468

Fat
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Old 03-26-2006, 05:20 PM
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Originally Posted by bigfatty
I got your back Irish

-0.0000056772653603822003180230482446468

Fat
damn, and I was thinking it was more like -0.00000056772653603822003180230482446491

oh well...
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Old 03-26-2006, 07:04 PM
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Heh interesting indeed, thanks again guys.
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Old 03-26-2006, 08:35 PM
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That and the variable intake is the whole reason between the horsepower difference with 4th and 5th gens right?
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