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.)
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.)