Intake resonance pipe?

[tranzformer]

So will this take away from the performance of the car at all? Will a delete help the exhaust flow better? I have never had a car with a intake resonance pipe. Just curious how useful it is and if a delete would be beneficial.

[KaliKev]

I am interested as well but I would assume many aftermarket intakes would not have the cut out for it.

[pingpongitore]

An intake resonance pipe simply transmit sound from the engine bay into the cabin. It allows no airflow and attaches to the intake externally

It doesn't affect performance negatively or positively. It is just a work around to get more engine noise into the cabin without compromising nvh engineering

[tranzformer]

Originally Posted by pingpongitore

It doesn't affect performance negatively or positively. It is just a work around to get more engine noise into the cabin without compromising nvh engineering

Ok that's what I wanted to know. I knew it wouldn't add to performance, just wasn't sure if it was taking away or not.

[RRnold]

There will be a trade off when going with an aftermarket intake with an increase of engine noise. If you don't mind it then you should be good.


Acoustic resonance:

Sounds are waves in the air, specifically longitudinal waves. These type of waves cause pressure waves (90 degrees out of phase with wave itself) that are directly proportional in strength to the amplitude of the sound wave.
It is possible to utilize this effect to increase intake air pressures within the intake tube. In most instances the amplitude of a sound wave is not that large. During resonance however the sound wave amplitude becomes much larger (and so does the pressure wave following it). During this resonance it is possible to gain significant amounts of torque and actually create positive manifold pressure (above 1 atm). This effect is sometimes called the AEM HUMP, where power spikes ~10hp for a couple hundred RPM around 4500 RPM in their cold air intakes. The resonance frequency
of a pipe depends on the length and the diameter of the tube.

Fn= n (v/4L)

n = wave number, v = velocity of sound (~340m/s), L length of pipe
Note: v the speed of sound changes with temperature.

The diameter of a pipe has a small effect on the resonance frequency as well. The sound wave behavior remains consistent
with that of a pipe for ~.6 times the diameter (D). So

Fn= n (v)
___________
4(L+.6(D))

For a 1-meter intake pipe this translates into a resonance frequency of 85 hz or 5100 RPM. The intake pipe reaches
resonance frequency when the driving force of the system (the engine) is also at that frequency. This is RPM/60;
rotations per second.

http://ftlracing.com/tech/engine/intake.html

[Mr.Jay]

The new stangs got it as well

its gonna sound mean (I hope) with breathing mods

[Longhorn248]

Thanks RRnold for droppin some knowledge. So basically a little bit more noise is the trade off for a bit more power from an aftermarket intake?

[tranzformer]

Thanks RRnold.

[Dark]

Get tuned exhaust, it will be loud enough to get in the cabin. Tuned exhaust will probably be lighter, and have more power too.

[tranzformer]

Originally Posted by Dark

Get tuned exhaust, it will be loud enough to get in the cabin. Tuned exhaust will probably be lighter, and have more power too.

Eventually I would want a Ti exhaust.

[Levi]

I think taking away resonance pipe would also clean up the engine bay. There'll be more space for....a supercharger?

I don't what is the use of that. On a V10 like the LF-A or yes, but not on a 25K entry sportscar. I would rather prefere carbon fiber intake, like the M3 CSL E46 or even 320si E90. Those sound good.

[torquemada]

ok, I hate it. It feels wrong, if you want sound, buy an aftermarket exhaust, that´s pure and evil. I don´t care if VW does this with the GTI, or Porsche with the 911.

that generates sound

[Mr.Jay]

Originally Posted by torquemada

ok, I hate it. It feels wrong, if you want sound, buy an aftermarket exhaust, that´s pure and evil. I don´t care if VW does this with the GTI, or Porsche with the 911.

that generates sound

The exhaust is what generates sound the intake resonance pipe just redirects the sound

[ahausheer]

Intake resonance pipes use a diaphragm that transmits only sound waves. No air is diverted from the intake path so performance should not be hurt. One thing you can play with is removing the intake resonator (black box adjacent to air filter housing passenger side) to see how it changes the sound.