Clunk in the rear
06-18-2012, 12:01 PM
#1
Clunk in the rear
I have noticed with the Powell XXX rear sway bar that the rear seems to clunk over bumps. Seems to happen at slower speeds just drining around town over bumps in the road. Kinda makes a pop/clunk, not metal on metal ting sound though. Just wanted to see if anyone else has the same issue cause im not seeing any worn out bushings or loose bolts.
milwaukee scca event 2 6-17 - YouTube
Video from the weekend! The cobalt felt amazing, ended up taking the win in F by .9 of a second. A lot considering the guy i beat is the same one i only won by .056 at the lincoln tour. Still feel like there was some time left out there though.
Lovin the cobalt
milwaukee scca event 2 6-17 - YouTube
Video from the weekend! The cobalt felt amazing, ended up taking the win in F by .9 of a second. A lot considering the guy i beat is the same one i only won by .056 at the lincoln tour. Still feel like there was some time left out there though.
Lovin the cobalt
06-18-2012, 12:14 PM
#2
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Good driving man! That course looked really fun. Sorry but I can't help out with the rear clunk, I have the hardcore bar and don't experience it. But question; what is the F class? Is it one of the street tire classes?
06-18-2012, 12:22 PM
#3
I've got a similar sound. It only happens at slower speeds where the suspension actuates a decent amount, like entering a driveway at an angle or driving over an uneven manhole cover. I've got the TTR bar. I just always assumed it was a body panel or some interior panel moving when I drive over the bumps. Now that I think about it, I can't remember it happening when both wheels move (like if I hit a speed bump straight on).
06-18-2012, 12:40 PM
#5
I've got a similar sound. It only happens at slower speeds where the suspension actuates a decent amount, like entering a driveway at an angle or driving over an uneven manhole cover. I've got the TTR bar. I just always assumed it was a body panel or some interior panel moving when I drive over the bumps. Now that I think about it, I can't remember it happening when both wheels move (like if I hit a speed bump straight on).
06-18-2012, 02:25 PM
#9
Check the exhaust. With the car lowered on the ground, or on wood planks, try to fit your fingers between the exhaust and twisting rear beam. Good chance that you'll find it's just a finger's width. Won't clunk if you twist it, usually, but if you go over something that causes both sides to move up, like a speed bump, you'll hear it.
06-18-2012, 03:06 PM
#10
As for the battery I have a 15 lb braille battery ratcheted down in the trunk so I know that's not moving at all.
They are good ideas, just not plausable reasons for the noise in my car.
06-18-2012, 03:56 PM
#12
Check the exhaust. With the car lowered on the ground, or on wood planks, try to fit your fingers between the exhaust and twisting rear beam. Good chance that you'll find it's just a finger's width. Won't clunk if you twist it, usually, but if you go over something that causes both sides to move up, like a speed bump, you'll hear it.
I know with the muffler delete the exhaust does sway a little more since all i have is a turn down from where i cut it.
06-18-2012, 06:47 PM
#13
If you really want to check, just unbolt the bar and go for a drive. I really don't know how the bar would cause noise though.
06-18-2012, 10:40 PM
#17
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I hear it too and have a similar setup, same scenarios. I'm going to check the install again, my car may not have been perfectly level during installation but I remember there was an issue with the front of the bar hitting the beam so John added some spacers to keep the bar from getting pulled up into the twb holes where the bolts at the front go. Do you have washers on the front between the bar and twb?
06-19-2012, 10:02 AM
#18
That's the opposite of what typically happens when the exhaust contacts the beam. You can always just jack the car up and look to see if you have marks on the exhaust. You have the little spacers on the sway bar to keep it away from the beam right?
If you really want to check, just unbolt the bar and go for a drive. I really don't know how the bar would cause noise though.
If you really want to check, just unbolt the bar and go for a drive. I really don't know how the bar would cause noise though.
06-19-2012, 10:38 AM
#19
Newer hardcore bars (like mine) come with them already welded on. Is yours older?
I guess the first question I should ask is - Is the XXX the same design as the hardcore, just different thickness or tube diameter? Am I comparing apples to apples?
I guess the first question I should ask is - Is the XXX the same design as the hardcore, just different thickness or tube diameter? Am I comparing apples to apples?
06-26-2012, 03:07 PM
#25
torque bolts to 50 ft lbs, and yes later bars are welded in spacers but the gap to the V beam is variable because the Vbeam is not that precise in its dimension.
most of the banging at the rear I see and hear is exhaust that comes in to our shop, sometimes its a bad shock, sometimes its the twisting beam pivot bushing and sometimes its junk in the trunk.
most of the banging at the rear I see and hear is exhaust that comes in to our shop, sometimes its a bad shock, sometimes its the twisting beam pivot bushing and sometimes its junk in the trunk.
