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Discussion Starter · #1 ·
I got to take my Ascent Touring out on the highway today.

I punched it at about 65 mph to about 80+ mph. The turbo was effortless, smooth and quick. The steering and ride were spot on smooth and very comfortable, on par with any luxury car.


What I did notice was a resonant hum in the car at about 80 mph. Being a geek, I happen to have a sound spectrum analyzer on my phone and measured the resonant hum to be almost exactly at 200 Hz, a sound comparable to the the G under middle C on a piano.


The underlying question is where is it coming from? This is obviously a new design from the ground up. Could it have been tire noise? Air vibrating the roof racks? My guess is that it has something to do with the rigidity of the frame, but it was repeatable every time I reached that speed.


At first I though it might have been from the radio, but it was there with the radio off.
Has anyone else noticed this? If you listen, I'll bet it's there. It sounds like a midrange hum.

(I had a similar problem with my 1980 TR7 convertible between 55 and 70 mph, but that was traced to structural issues with the convertible design. It actually vibrated at that speed.)
 

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This sounds like road/tire noise. It's well-known about. While I haven't used a spectrum analyzer, I've heard a similar hum at speed on some roads (in the Portland area, freeway/highway roads vary widely). The suspension absorbs some of it, but just right road at just the right speed can really make it significant.
 

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If you're hearing things from above your head, potentially it could be contributed by sunroof. The sunroof has drainage channel to convey any fluid away.

Any cabin that has holes poked thru (i.e. sunroof cutout for movable glass, or firewall with ancillary objects passed thru) and doors not sealed properly, you'll have air leaking into, causing a wide spectrum of sound level
 

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I’ll bet it’s tire noise...I was told the Falken’s are the only tire offered. I’ll try them out but I had similar issues on our Ford Flex. When I changed to Continental ExtremeContacts on the 20” wheels, the drop in noise was incredible and I got 40,000 Miles out of them. It came with Goodyear Eagles which were lousy.
 

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I’ll bet it’s tire noise...I was told the Falken’s are the only tire offered. I’ll try them out but I had similar issues on our Ford Flex. When I changed to Continental ExtremeContacts on the 20” wheels, the drop in noise was incredible and I got 40,000 Miles out of them. It came with Goodyear Eagles which were lousy.
was going to recommend conti extreme contacts as well. great tires.
 

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Discussion Starter · #14 ·
With lots of new members, have any of you noticed a hollow sounding hum that starts at speeds above 75mph? (If not, perhaps a wheel bearing after all.) If this is a tire issue with the 20" tires, everyone should have it.
 

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Do you have roof rails installed?

If you have the roof rails installed on your Ascent, make sure they're installed correctly. There's been a bunch installed backwards, or one backward and one properly.

The thick edge faces forward, like a raindrop falling - thick part faces into the wind.
 
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