Induction noise - reduction methods
01-23-2011, 04:30 PM
#1
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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
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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01-23-2011, 05:11 PM
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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 £$£$£ :(
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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01-23-2011, 05:43 PM
#6
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
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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01-24-2011, 09:54 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.
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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01-24-2011, 10:46 AM
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^^ 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.
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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01-24-2011, 12:20 PM
#18
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.
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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