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Old 01-24-2013, 02:39 PM   #1
slow03
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Default Exhaust sound tuning?

I am planning on building an exhaust for my car, but I don't want it to sound too rumbly or throaty. I am building this exhaust for a 1.6L inline 4 cylinder. All the exhausts I have heard, try to make the car sound like a muscle car/rice rocket. I want a sound that's a bit more "exotic". Something like a Ferrari 355/360 or Infiniti G37.
What is the best way to figure out the right sound without buying 9 different resonators and mufflers to get the sound I want?

Thanks for the help.
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Old 01-24-2013, 10:47 PM   #2
madlib
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Not sure if you'll be able to make it sound "exotic"...maybe add a supercharger.

However, a good way to minimize the subaru rumble is to run an equal length header.
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Old 01-24-2013, 11:08 PM   #3
bmw325ix
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exotic sound would be a difficult goal, think about just the engine style. Exotics tend to have high cylinder count engines that are not to large in displacement.
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Old 01-24-2013, 11:59 PM   #4
scby rex
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buy a ferrari exhaust system.
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Old 01-25-2013, 12:45 PM   #5
DeleriousZ
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Best bet is to build an equal length tubular exhaust manifold.
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Old 01-30-2013, 12:09 AM   #6
miracle_whip4130
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For simple resonance chambers (google Helmholtz resonator), you can calculate a theoretical natural frequency that would be amplified for a given chamber geometry. However, the complex geometry of an automotive muffler would make these calculations difficult........and that would be assuming that you knew the exact frequency you wanted to amplify, and geometrical data for the muffler.......which you most likely don't. The bottom line is that this type of design and testing is what exhaust manufacturers spend their money on, and the average DIY guy won't have the necessary resources. The best you can do is probably to search around and listen to sound clips to try to find what sounds best to you.
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Old 03-05-2013, 06:06 PM   #7
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Most exotic cars sound "exotic" because they have flat crank v8/v10/v12's with EL headers that rev very high.
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Old 03-06-2013, 12:46 AM   #8
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very small diameter tubing and a loooooonnnnnnnggggg primary tubed header
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Old 03-06-2013, 12:53 AM   #9
TheStepfather
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add 8 more cylinders and it will sound exotic as ****.
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Old 03-06-2013, 02:36 AM   #10
Uncle Scotty
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ya NEVER gonna get a 1.6L inline 4 to sound like anything but what it is......waste of time
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Old 03-06-2013, 11:30 AM   #11
slow03
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I don't think its a waste of time. I am working on my intake now, and the exhaust will soon follow.
I have done a lot of research, and I think I can get close.
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Old 03-07-2013, 02:47 AM   #12
Matty_STi
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Rev it to 10k.


Seriously though. Those exotic cars (think zonda r with those stunning amg engines) tend to run high strung high revving v10s and v12s.

If you focus on emphasizing higher frequencies through helmholtz resonance (like mentioned earlier) you'll get closer to where your going. Also longer piping won't help as you are going to be emphasizing quarter wavelength resonance through transmission line style emphasis. An exhaust length of half the standard wrx exhaust will get you in the range. Too short and you won't be able to tune the sound. Too long and transmission line effects take over.

Want to learn about tuning a pipe for resonance check out the DIY section of avs forum and also diyaudio forum.

-Matt

Last edited by Matty_STi; 03-07-2013 at 02:54 AM.
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Old 03-08-2013, 12:45 AM   #13
Purple Drink
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Quote:
Originally Posted by miracle_whip4130 View Post
For simple resonance chambers (google Helmholtz resonator), you can calculate a theoretical natural frequency that would be amplified for a given chamber geometry. However, the complex geometry of an automotive muffler would make these calculations difficult........and that would be assuming that you knew the exact frequency you wanted to amplify, and geometrical data for the muffler.......which you most likely don't. The bottom line is that this type of design and testing is what exhaust manufacturers spend their money on, and the average DIY guy won't have the necessary resources. The best you can do is probably to search around and listen to sound clips to try to find what sounds best to you.
You are correct. From the way air enters the motor to the way it exits the sound it creates can be manipulated and tuned. But I doubt anyone here has those resources. A great example is the Lexus LFA. Yes it's not a 4 banger but its been specifically design to have a certain exhaust note.
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Old 03-08-2013, 01:44 AM   #14
Dirtracr95
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Are you looking for a sound more like this s2000? (Yea its an old video and might be fake but its awesome sounding)


Last edited by Dirtracr95; 03-08-2013 at 01:50 AM.
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Old 03-08-2013, 09:29 AM   #15
slow03
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That sound is a bit tinny. Kind of like a thousand bees in a coffee can.
It's close to what I want, but not exactly what I want.
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