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[R53] Whop-whop noise from rear of car
It got cold here for the first time over the last few days, and I've been getting a sort of whop-whop-whop noise out of the rear end. It's happened during acceleration, coasting, and left turns for sure. It seems to go away when I'm on the brakes.
Any ideas? |
Did you change over to winters recently before the noise started?
Any new work done (brakes) otherwise? |
Sounds like a brake or bearing issue....
Does the change match your speed change? Notice if the hub area seems hotter on the noisy side than the quiet one? |
Nope, same tires as before. It does sound a lot like wheel/tire noise, though, except in that it goes away sometimes.
It might be brakes. I know from my last chat with my mechanic that the rear rotors especially are on borrowed time. I'm hoping it isn't a wheel bearing. >.> Next time I have to go somewhere I'll give the hubs a feel check. |
I'm with Zippy....bearing was my first thought as soon as I read the title. I have ridden a couple of motorcycles that had a similar noise and it ended up being bearings both times. Keep is posted.
Originally Posted by ZippyNH
(Post 4014634)
Sounds like a brake or bearing issue....
Does the change match your speed change? Notice if the hub area seems hotter on the noisy side than the quiet one? |
Almost certainly not a bearing or brake issue—no temperature difference between the hubs, and it's also dependent on engine speed instead of road speed.
I was driving home tonight, and I heard the noise more clearly than usual, in 3rd gear at about 2100 rpm. I went to neutral and kept the revs between about 2000 and 2200, and I could hear it in that range. When I got home, I tried it in the driveway and didn't have the noise anymore. I think the noise is coming more from generically down as opposed to down and behind me, which, along with neutral/in-gear making no difference, seems to suggest clutch to me. It has been 83,000 miles or so without being replaced, and I have no idea how hard it was used before I bought it at 67,000. |
At 83k, it wouldn't hurt to replace the clutch anyways. I guess a bearing would have been too easy.
Originally Posted by Fishbreath
(Post 4016609)
Almost certainly not a bearing or brake issue—no temperature difference between the hubs, and it's also dependent on engine speed instead of road speed.
I was driving home tonight, and I heard the noise more clearly than usual, in 3rd gear at about 2100 rpm. I went to neutral and kept the revs between about 2000 and 2200, and I could hear it in that range. When I got home, I tried it in the driveway and didn't have the noise anymore. I think the noise is coming more from generically down as opposed to down and behind me, which, along with neutral/in-gear making no difference, seems to suggest clutch to me. It has been 83,000 miles or so without being replaced, and I have no idea how hard it was used before I bought it at 67,000. |
My First thought was cupped tires, no noise at slower speeds, then with increased road speed the noise would get a little louder, until it was at harmonic balance.
Cheap and easy check, double check tire pressure and swap fronts for rears, and take for a quick spin at the speeds you were running when you heard it. Rears are most likely to start sounding up over time... one really great reason to stick to a regiment of tire rotation, I do mine about every 5K miles. Motor on! |
Turns out it wasn't a bad thing at all: although the clutch will need a replacement soon, this noise is an exhaust system noise. The bumpy roads of Dallas knocked something near the back of the car loose. If I kick the exhaust, I get a 'whop' that sounds a lot like the one I sometimes get in the cabin. I figure some clip came loose, and occasionally a bump jostles the exhaust so that it's sitting crooked enough to resonate at certain engine speeds. Another bump will jostle it back to a position where it's dampened.
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Originally Posted by Fishbreath
(Post 4074902)
Turns out it wasn't a bad thing at all: although the clutch will need a replacement soon, this noise is an exhaust system noise. The bumpy roads of Dallas knocked something near the back of the car loose. If I kick the exhaust, I get a 'whop' that sounds a lot like the one I sometimes get in the cabin. I figure some clip came loose, and occasionally a bump jostles the exhaust so that it's sitting crooked enough to resonate at certain engine speeds. Another bump will jostle it back to a position where it's dampened.
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