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What are the black things in the wheel

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Old 09-28-2017, 12:58 PM
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What are the black things in the wheel
There are 4 of them. Im just curious what they are.
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Old 09-28-2017, 12:59 PM
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TPMS sensor ?
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Old 09-28-2017, 01:02 PM
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No the sensor is on the valve stem
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Old 09-28-2017, 01:05 PM
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Ahh is it the PAX system
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Old 09-28-2017, 01:09 PM
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Harmonic sound reduction device. How it works I do not know.
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Old 09-28-2017, 01:24 PM
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Originally Posted by RLX-Sport Hybrid
Harmonic sound reduction device. How it works I do not know.
maybe the holes are tuned for a specific freq?
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Old 09-28-2017, 01:26 PM
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Ah i think it is the pax system! Thank you
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Old 09-28-2017, 01:27 PM
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Here's a link which opens a quick blurb on what they are. The specific mention of Acura is near the middle of the page.

http://dillaircontrols.com/dill/wp-c...OE-Recalls.pdf
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Old 09-28-2017, 01:28 PM
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In an effort to reduce cabin/road noise, Acura uses a polypropylene Helmholtz resonator that encircles the center portion of the inside of the wheel - this is supposed to significantly lower middle frequency noise.
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Old 09-29-2017, 12:11 PM
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Originally Posted by Limelight
Helmholtz resonator.
That really and truly sounds like something they'd make up for a Star Trek episode.
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