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Old 01-23-2011, 05:30 PM   #1
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Default Induction noise - reduction methods

Does anyone have any good solutions to reducing inlet tract/induction noise?

I have (for my sins yadda yadda) an MP62 which whilst sounds nice when in the mood at WOT is now starting to get on my nerves when just trying to commute.

I've had the car for 7 or so years and the charger setup for 5 or so years.

I have an A/A IC fitted, but in order to stop idle droop and awful throttle response I've had to fit a dual throttle body setup which works great, the downside is a tendency to cause the charger to whine at part throttle.

So long story short any tips to reducing inlet tract noise? FWIW if it costs a bit of power I'm ok with that assuming it can be reversed when on track (so no smaller pulleys).

I've tried lengthening the inlet tract to the charger considerably with very little/no effect.

Thanks
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Old 01-23-2011, 05:55 PM   #2
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My supercharged miata has the tb in the stock location so the noise is probably similar. Here is my solution for commuting.

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Old 01-23-2011, 06:00 PM   #3
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try to fit the stock airbox back on the car?
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Old 01-23-2011, 06:06 PM   #4
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Yeah, he might as well remove the supercharger while at it.
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Old 01-23-2011, 06:11 PM   #5
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Had thought of the stock airbox, or at least part of it, and building a glass-fibre enclosure for the OEM panel filter but there's just no frigging room at all :(

My dad has an M45 Coldside which I've DD for the last week, and there's virtually zero induction noise, it was bliss, his cars induction tract goes from the back of the charger, under the inlet manifold and then to the front of the engine and is mated to a JRCAI kit, I'd ape that if I could but don't possess the skills, nor have the room he does.

RE: a different car for a DD, I'd like to but can't afford the £$£$£ :(
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Old 01-23-2011, 06:43 PM   #6
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Quote:
Originally Posted by Reverant View Post
Yeah, he might as well remove the supercharger while at it.
this.


Based on some of the rather complicated OEM intake tracts I've seen, it seems some fluidics engineers are working hard to keep modern cars quite. I don't think there's a simple solution (such as lengthening the path).

An air box should help in quieting an noise caused by the filter itself but it probably won't entirely 'resolve' the noise as I assume much of it is coming from the 'charger.

-Zach
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Old 01-23-2011, 07:06 PM   #7
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A muffler of some sort will help some.
Look at how straight thru mufflers are constructed. The pipe has lots of holes, then it's wrapped with sound deadener, then sealed...
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Old 01-24-2011, 12:55 AM   #8
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maybe different types of intake filters?
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Old 01-24-2011, 10:54 AM   #9
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the y8s perfect quiet high flow intake consists of:

a trumpet style 3" inlet that leads to an airbox with a large panel filter which leads to your throttle body (or SC). if there are any droning intake frequencies, you can add helmholz resonators off the post-filter inlet pipe to shut them up.

of course the OEM 2001 intake pipe is exactly what I've just described except for it isn't 3 inches in diameter.
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Old 01-24-2011, 11:03 AM   #10
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I thought that intake tract noise from a hot rod was a good thing. Are you guys going soft on me?
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Old 01-24-2011, 11:08 AM   #11
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noise is annoying. you dont have to sound like a honda to be fast.
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Old 01-24-2011, 11:46 AM   #12
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Quote:
Originally Posted by Braineack View Post
noise is annoying. you dont have to sound like a honda to be fast.
^^ this

Thanks y8s, I'm going to have a play fabricating an airbox and use the OEM panel filter, fingers crossed it has an appreciable effect.

FWIW one of the members on MX5Nutz has an enclosed 'carbon' filter, like the type BMC sell, he said it cut down his intake noise a lot, especially around idle/cruise.
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Old 01-24-2011, 12:11 PM   #13
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Old 01-24-2011, 12:14 PM   #14
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Install sub woofers
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Old 01-24-2011, 12:15 PM   #15
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I suggest oem airbox = no one gives a ****.
others suggest it a few posts later = idea of the century

I give up. lol
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Old 01-24-2011, 12:55 PM   #16
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Quote:
Originally Posted by 18psi View Post
I suggest oem airbox = no one gives a ****.
others suggest it a few posts later = idea of the century

I give up. lol
i suggested emulating it, not fitting it back on.
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Old 01-24-2011, 01:11 PM   #17
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Fit an empty 2 liter bottle with a hose attached to the intake!



I swear it works.
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Old 01-24-2011, 01:20 PM   #18
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http://forum.miata.net/vb/showthread.php?t=285960

http://forum.miata.net/vb/showthread.php?t=235997


LMAO @ douches getting all pissy about the induction noise of a turbo.
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Old 01-24-2011, 01:29 PM   #19
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I've actually thought about stuffing my cold air box... my intake is loud.
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Old 01-24-2011, 01:30 PM   #20
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Quote:
Originally Posted by Doppelgänger View Post


LMAO @ douches getting all pissy about the induction noise of a turbo.
My thoughts exactly.
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