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2k c2 no mods. Weird sound at 60 mph goes away at 70+


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The car is a daily driver with 42k miles. Last night, when I got on the highway and hit 60mph a humming sound was coming from the rear. It sounded to me like if you were to hit a bad patch of road or a bridge but that wasn't the case. As I stated in the thread title, the sound disappeared at 70mph. Last weekend I put 160 miles on the car at highway speeds and did not hear the sound. My rear tires are due for a change out and hopefully that's the issue. hope it's not a cracked break pad or something. Anyway I've scheduled an appointment with the dealership next week.

Any thoughts?

Oh and the hum does not oscillate, it's constant at 60mph.

Thanks,

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The car is a daily driver with 42k miles. Last night, when I got on the highway and hit 60mph a humming sound was coming from the rear. It sounded to me like if you were to hit a bad patch of road or a bridge but that wasn't the case. As I stated in the thread title, the sound disappeared at 70mph. Last weekend I put 160 miles on the car at highway speeds and did not hear the sound. My rear tires are due for a change out and hopefully that's the issue. hope it's not a cracked break pad or something. Anyway I've scheduled an appointment with the dealership next week.

Any thoughts?

Oh and the hum does not oscillate, it's constant at 60mph.

Thanks,

This one may be an easy one. I was thinking it was your tires, then when you mention that they are do for a change, that was the icing for me. With some tires, as they wear down they can be loud at certain speeds. If it is time to change, I would change the tires and see if that was your problem.

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This one may be an easy one. I was thinking it was your tires, then when you mention that they are do for a change, that was the icing for me. With some tires, as they wear down they can be loud at certain speeds. If it is time to change, I would change the tires and see if that was your problem.

Yeah, that's probably it. Last weekends little trip(constant 80+mph) probably wore off just enough rubber to make the hum. The rears are not bald but the tread is way worn.

Thanks much.

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This one may be an easy one. I was thinking it was your tires, then when you mention that they are do for a change, that was the icing for me. With some tires, as they wear down they can be loud at certain speeds. If it is time to change, I would change the tires and see if that was your problem.

Yeah, that's probably it. Last weekends little trip(constant 80+mph) probably wore off just enough rubber to make the hum. The rears are not bald but the tread is way worn.

Thanks much.

bc,

Another way to further diagnose it is the tires ( most likely given the wear etc.) is to inflate the tires to 44PSI ( if not alreay) and run for a day to see if the noise changes. If you are already at the 44PSI, then reduce to 38PSI and check for same noise. I would guess it is 99% certain it is the tires. I had the same problem with Pirelli Asymmetrico's when they were ready for replacement.

Good luck!! demosan :cheers:

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This one may be an easy one. I was thinking it was your tires, then when you mention that they are do for a change, that was the icing for me. With some tires, as they wear down they can be loud at certain speeds. If it is time to change, I would change the tires and see if that was your problem.

Yeah, that's probably it. Last weekends little trip(constant 80+mph) probably wore off just enough rubber to make the hum. The rears are not bald but the tread is way worn.

Thanks much.

bc,

Another way to further diagnose it is the tires ( most likely given the wear etc.) is to inflate the tires to 44PSI ( if not alreay) and run for a day to see if the noise changes. If you are already at the 44PSI, then reduce to 38PSI and check for same noise. I would guess it is 99% certain it is the tires. I had the same problem with Pirelli Asymmetrico's when they were ready for replacement.

Good luck!! demosan :cheers:

demosan,

Hey, great idea, I'll give it a shot later tonight and it's an excuse to take the Porsche out for a spin. :)

Thanks my man.

Edited by bluescast
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