TL exhaust and what we hear
08-06-2012, 07:00 PM
#1
Drifting
Thread Starter
TL exhaust and what we hear
From the last post, https://acurazine.com/forums/3g-tl-performance-parts-modifications-112/tl-exhaust-vs-others-863120/
Below is what we hear when we hear a sound coming from the exhaust pipe. It can't be the combustion explosion because it is a sealed chamber. So what do we hear? In order to create a lower "sound" for a meaner aggressive sound, we have to ask "what are we hearing in the first place"? And that is what I was trying to ask when every Acurazine idiot replied with folly and babblings.
As I asked previously, what is the source of the sound? It's interesting because it is simliar to the way a speaker causes sound.. as I described here:
https://acurazine.com/forums/showthr...=591510&page=2
The speaker oscillates and your brain interprets these vibrations as sound.
-----------------------------
http://auto.howstuffworks.com/muffler1.htm
Where Does the Sound Come From?
Sound is a pressure wave formed from pulses of alternating high and low air pressure. These pulses makes their way through the air at -- you guessed it -- the speed of sound.
In an engine, pulses are created when an exhaust valve opens and a burst of high-pressure gas suddenly enters the exhaust system. The molecules in this gas collide with the lower-pressure molecules in the pipe, causing them to stack up on each other. They in turn stack up on the molecules a little further down the pipe, leaving an area of low pressure behind. In this way, the sound wave makes its way down the pipe much faster than the actual gases do.
When these pressure pulses reach your ear, the eardrum vibrates back and forth. Your brain interprets this motion as sound. Two main characteristics of the wave determine how we perceive the sound:
Below is what we hear when we hear a sound coming from the exhaust pipe. It can't be the combustion explosion because it is a sealed chamber. So what do we hear? In order to create a lower "sound" for a meaner aggressive sound, we have to ask "what are we hearing in the first place"? And that is what I was trying to ask when every Acurazine idiot replied with folly and babblings.
As I asked previously, what is the source of the sound? It's interesting because it is simliar to the way a speaker causes sound.. as I described here:
https://acurazine.com/forums/showthr...=591510&page=2
The speaker oscillates and your brain interprets these vibrations as sound.
-----------------------------
http://auto.howstuffworks.com/muffler1.htm
Where Does the Sound Come From?
Sound is a pressure wave formed from pulses of alternating high and low air pressure. These pulses makes their way through the air at -- you guessed it -- the speed of sound.
In an engine, pulses are created when an exhaust valve opens and a burst of high-pressure gas suddenly enters the exhaust system. The molecules in this gas collide with the lower-pressure molecules in the pipe, causing them to stack up on each other. They in turn stack up on the molecules a little further down the pipe, leaving an area of low pressure behind. In this way, the sound wave makes its way down the pipe much faster than the actual gases do.
When these pressure pulses reach your ear, the eardrum vibrates back and forth. Your brain interprets this motion as sound. Two main characteristics of the wave determine how we perceive the sound:
- Sound wave frequency - A higher wave frequency simply means that the air pressure fluctuates faster. The faster an engine runs, the higher the pitch we hear. Slower fluctuations sound like a lower pitch.
- Air pressure level - The wave's amplitude determines how loud the sound is. Sound waves with greater amplitudes move our eardrums more, and we register this sensation as a higher volume.
08-06-2012, 07:07 PM
#2
Drifting
Thread Starter
notice that inductance has nothing to do with low frequencies or high frequencies for that matter, that protrude from our exhaust pipe, but yet our brain perceives this air flow, or air movement as lower or higher tones depending on certain physical parameters.
Last edited by Chad05TL; 08-06-2012 at 07:09 PM.
08-06-2012, 09:32 PM
#3
Burning Brakes
iTrader: (1)
are you serious? What do you think determines the frequency and air pressure, Sherlock? Pretty much everything we were talking about in that other thread. If there were no variables like the ones mentioned in the previous thread, then every V8 would sound the same. But they don't. Because there are those variables that determine differing frequency and air pressure.
The frequency and air pressure you speak of are the direct results of what all the "stupid people on Acurazine" told you.
08-06-2012, 10:51 PM
#4
Suzuka Master
Oh No! more crazy talk
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Undying Dreams (08-07-2012)
08-06-2012, 11:12 PM
#5
My V8 titan sounds way better than my I4 integra. has alot to do with it. and there is no way to get an I4 to sound like my v8. Granted the titan has a banks exhaust system and the teg has a magnaflow system with a cheapy muffler. Basicaly the exhaust has alot to do with the sound of a car. Run cutouts on the TL and listen to it. Im willing to bet it sounds good. Its a luxery/sport car that they wnted to be quiet because most people who buy these cars arnt worried about alot of performance. My V6 murano sounds pretty week too, but strait motor sounds pretty cool for a V6
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Undying Dreams (08-07-2012)
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08-07-2012, 01:15 PM
#14
Race Director
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justnspace (08-07-2012)
08-07-2012, 01:43 PM
#16
Im sorry. I was mistaken.
the V10 is the real deal.
its the newer v8 in the M5's that are artificially re-produced.
Per this article:
http://autos.yahoo.com/news/the-rise...gine-roar.html
the V10 is the real deal.
its the newer v8 in the M5's that are artificially re-produced.
Per this article:
http://autos.yahoo.com/news/the-rise...gine-roar.html
Anyone who's heard a Ferrari V-8 at full wail knows perfectly well that engines make music. But today, that vroom-vroom is getting harder to hear, thanks in equal parts to turbochargers that muffle the noise, increasingly insulated cabins, and government noise regulations.
Automakers are well aware that a snarly engine note enhances the behind-the-wheel experience—especially for sporty cars—and all sorts of devices have been used to let in this "good" noise. The Chevrolet Corvette's exhaust system has a valve that opens under full throttle and bypasses the muffler. The Porsche Cayman and the Ford Mustang both have "noise pipes" that connect the intake system to the cabin. These passive systems, however, are slowly being replaced with active systems that play a prerecorded track through speakers.
Case in point: Volkwagen's GTI used to have a noise pipe, but when the latest version appeared in 2011, the pipe was replaced with the Soundaktor. This system uses a hockey-puck-size speaker mounted on the firewall to generate extra noise. VW didn't exactly advertise the feature, and when word got out, the forums lit up.
"The Soundaktor is only there to lie to me," fumed one GTI owner on vwvortex.com when he found out his car has the system. "It's false advertising, plain and simple."
Andrew Wong is a 29-year-old engineer from Detroit. When he learned that his 2011 GTI had the Soundaktor, he simply removed it. Now he relies on an aftermarket exhaust system for better noise. "I want to hear the engine, rather than some version of the engine being played to me," he says.
VW is not alone. The new BMW M5, which ditched the sonorous V-10 for a twin-turbo V-8, plays an engine soundtrack through the car's audio system. From a carmaker's perspective, these active sound generators have definite benefits over a sound pipe: There's no need to cut a hole in the firewall or package a separate tube in the already crowded engine bay. Plus, the active devices allow a far greater degree of tunability and can be used to mask unwanted noise.
It remains to be seen just how far automakers will take these systems, but in the future, you may be able to toggle a switch that makes your Prius howl like it's got a V-8.
Automakers are well aware that a snarly engine note enhances the behind-the-wheel experience—especially for sporty cars—and all sorts of devices have been used to let in this "good" noise. The Chevrolet Corvette's exhaust system has a valve that opens under full throttle and bypasses the muffler. The Porsche Cayman and the Ford Mustang both have "noise pipes" that connect the intake system to the cabin. These passive systems, however, are slowly being replaced with active systems that play a prerecorded track through speakers.
Case in point: Volkwagen's GTI used to have a noise pipe, but when the latest version appeared in 2011, the pipe was replaced with the Soundaktor. This system uses a hockey-puck-size speaker mounted on the firewall to generate extra noise. VW didn't exactly advertise the feature, and when word got out, the forums lit up.
"The Soundaktor is only there to lie to me," fumed one GTI owner on vwvortex.com when he found out his car has the system. "It's false advertising, plain and simple."
Andrew Wong is a 29-year-old engineer from Detroit. When he learned that his 2011 GTI had the Soundaktor, he simply removed it. Now he relies on an aftermarket exhaust system for better noise. "I want to hear the engine, rather than some version of the engine being played to me," he says.
VW is not alone. The new BMW M5, which ditched the sonorous V-10 for a twin-turbo V-8, plays an engine soundtrack through the car's audio system. From a carmaker's perspective, these active sound generators have definite benefits over a sound pipe: There's no need to cut a hole in the firewall or package a separate tube in the already crowded engine bay. Plus, the active devices allow a far greater degree of tunability and can be used to mask unwanted noise.
It remains to be seen just how far automakers will take these systems, but in the future, you may be able to toggle a switch that makes your Prius howl like it's got a V-8.
Last edited by justnspace; 08-07-2012 at 01:46 PM.
08-07-2012, 04:17 PM
#18
Suzuka Master
iTrader: (2)
Im sorry. I was mistaken.
the V10 is the real deal.
its the newer v8 in the M5's that are artificially re-produced.
Per this article:
http://autos.yahoo.com/news/the-rise...gine-roar.html
the V10 is the real deal.
its the newer v8 in the M5's that are artificially re-produced.
Per this article:
http://autos.yahoo.com/news/the-rise...gine-roar.html
LOL at the last sentence.
"....in the future, you may be able to toggle a switch that makes your Prius howl like it's got a V-8"
08-07-2012, 04:26 PM
#19
takin care of Business in
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fail thread....links a fail thread....
08-07-2012, 05:10 PM
#20
Moderator
iTrader: (3)
This shiet again?
08-07-2012, 07:28 PM
#22
Senior Moderator
This thread is going to become a train-wreck just like the last one...
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