What do we know about the ANC system ? - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 15 (permalink) Old 02-05-2019, 04:16 PM Thread Starter
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What do we know about the ANC system ?

So this is for curiosity, directed to those more knowledgeable on Automatic Noise Cancellation Systems than myself.

When I made our first highway trip I was a bit surprised that our '19 Traverse wasn't even quieter. Don't get me wrong it is a huge improvement over our previous 08 Equinox ;-) However; if it had ANC, why am I still hearing recurring wind buffeting (from the exterior mirror?), and also expansion joint thumping on the interstate?
So; I began googling around to learn about the various GM implementations of ANC >> seems not all ANC systems are created equal.

For GM it seems this has been around a while beginning with some 4 cyl Equinoxes and Malibus.
I get the impression that many of these ANC implementations are tuned for a narrow freq. bandwidth that "listen-for" and cancel engine and drive-train noises (droning) at lower RPM cruising speeds of those vehicles' 4 cyl. engines.

So here we are with Gen II V6 Traverses with 4 microphones in the headliner, and an obscure note in the owners manual saying something to the effect of: Anyone making engine mods (air intake, exhaust, etc?) should disable (remove a fuse?) the vehicle's ANC system ??

I'm not contemplating mods - just looking to become further enlightened
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post #2 of 15 (permalink) Old 02-06-2019, 09:37 AM
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When it works it works. To see the difference pop the RDO fuse and see how the vehicle sounds without it in operation.



Apparently the system was not designed to make the vehicle quiet by eliminating all noises, only the real nasty ones like engine harmonics at certain rpms more noticeable with the lightweight bodies, mountings and composites designs. Engine drone at 2000-2100 rpm is significantly more noisy with the ANC defeated. Also, if the ANC mics are improperly located it can get really noisy.



https://gm-techlink.com/?p=10528


Windshield noise in the '18s may not be the stock windshield which is acoustic glass or the mirrors.....there are two plastic fillers located where the opposite ends of the cowl contact the windshield.....if not firmly in place and secured to the glass will cause windshield/side noises.

Current Chevys -'16 Silverado LT;'18 Malibu LT Redline;'18 Traverse Premier Redline<br /><br />Previous&nbsp; Chevys:16 Malibu LT2 '17 Impala;'16 MalibuLT;'15 Camaro LS;'15 Traverse; '13,'12 and '07 Avalanche LTs; '11 Tahoe LT; '13 &'11 Malibu LTs; '08 Trailblazer;'06 Colorado WT..... Chrysler era.....'80 Citation;'75 Impala;'72 Chevelle;'69 Camaro R/T;'65 Impala SS;'62 Nova
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post #3 of 15 (permalink) Old 02-06-2019, 10:48 AM
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I get the impression that the new Traverse- is a bit noisy- and Im thinking it may be due to the cylinder deactivation?
The engine being a V6- with plenty of power... and the exhaust not tuned to be sporty--- should be relatively quiet.... firing on all 6...... now when it changes mode...?



so the fact they threw it in... says alot.


I have a 2013 Equinox. the 3.6 V6.
The V6 versions do NOT have ANC.... while the 4 cyl do.
This tells me- the 4 cyl makes more noise than the 6.


Am I overthinking?

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.

2013 Equinox 3.6L - 83,000
2010 Traverse 3.6L- 148,000
2003 Trailblazer 4.2L- 181,500
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post #4 of 15 (permalink) Old 02-06-2019, 01:31 PM
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Excellent website! Thank you Thomcat!

2018 Traverse Premier Redline
2014 Mustang GT Convertible
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post #5 of 15 (permalink) Old 02-06-2019, 02:32 PM
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Noise from roads cracks are mostly caused by the tires specially the low profile tires that dont have too much cushions compared with the higher profile. Also summer tires are more noisy in the cracks than winter tires with a softer gum in the rubber. Not much you can do except to find some more quiet tires on the markets. Very common with different makes. The harder the tire the more noisy they are but they last longer. The price to pay.

Traverse 2017, chevy Uplander 2009 LT short wheelbase, Impala 2003, jeep cherokee Laredo 1990, chevy citation 1984 2.8 v6, vauxhall Firenza1972, rambler american 1964 model 330, vauxhall velox 1956 rebuilt, NSU Prinz 1961 2 cylinder micro car rebuilt, Renault Dauphine 1960 rebuilt, ford prefect 1952 ( english car with non hydrolic brakes rebuilt. Honda 1986 motorcycle in new condition and 13 travel trailers from a Boler 1300 to a Rockwood mini lite 20 feet.
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post #6 of 15 (permalink) Old 02-06-2019, 02:46 PM
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I get the impression that the new Traverse- is a bit noisy- and Im thinking it may be due to the cylinder deactivation?
What cylinder deactivation?

2013 Traverse LT (traded)<br />2014 Traverse LT<br />2016 Traverse LT AWD, 2019 Traverse Red Line
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post #7 of 15 (permalink) Old 02-06-2019, 03:22 PM
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I had read this a while back... on the new version...





"On the fuel efficiency front, the new transmission, reduced weight, cylinder deactivation on the V6 and standard automatic stop-start should all contribute to more miles per gallon."




does it not have it?

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.

2013 Equinox 3.6L - 83,000
2010 Traverse 3.6L- 148,000
2003 Trailblazer 4.2L- 181,500
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post #8 of 15 (permalink) Old 02-06-2019, 03:28 PM
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Could it be that was any early article and the new Traverse does not have it?
Or is this ANC only on the 4 cyl versions?


and finally, am I confusing it with the new Acadia.

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.

2013 Equinox 3.6L - 83,000
2010 Traverse 3.6L- 148,000
2003 Trailblazer 4.2L- 181,500
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post #9 of 15 (permalink) Old 02-06-2019, 03:57 PM
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3.6L V6 ENGINE

310 hp @ 6800 rpm
266 lb-ft of torque @ 2800 rpm
Variable Valve Timing and Spark Ignition Direct Injection
Includes Stop/Start technology that, under certain conditions, automatically shuts off the engine when the vehicle comes to a stop and the brake pedal is pressed; the engine restarts on its own when the brake is let up


I donít believe it has deactivation. Might have been considered but never implemented.

2013 Traverse LT (traded)<br />2014 Traverse LT<br />2016 Traverse LT AWD, 2019 Traverse Red Line
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post #10 of 15 (permalink) Old 02-06-2019, 06:35 PM
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Most GM Silverado size truck aluminum 5.3l V8s use AFM v8/4 cylinder deactivation and was talk about using an AFM system on the V6s being used in Colorados.


No AFM system on either the gen1 or gen2 Traverse V6.

Current Chevys -'16 Silverado LT;'18 Malibu LT Redline;'18 Traverse Premier Redline<br /><br />Previous&nbsp; Chevys:16 Malibu LT2 '17 Impala;'16 MalibuLT;'15 Camaro LS;'15 Traverse; '13,'12 and '07 Avalanche LTs; '11 Tahoe LT; '13 &'11 Malibu LTs; '08 Trailblazer;'06 Colorado WT..... Chrysler era.....'80 Citation;'75 Impala;'72 Chevelle;'69 Camaro R/T;'65 Impala SS;'62 Nova
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