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post #1 of 36 (permalink) Old 12-19-2016, 11:57 PM Thread Starter
mazda3415
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rear clunking noise

I currently have BC coilovers on my 2011 mazda 3 hatch. I have been noticing in the rear of my car I hear loud clunking or thumping noise when going over bumps? Is that a normal sound from the coils or could it be something else?

2011 MZ3 | Corksport catback exhaust with straight pipe | Corksport SRI | Corksport Stubby antenna | 06-07 STI Lip | Bayson R side skirt extensions and rear lip | Rallyarmor Mud Flaps | DDM 6000k HID | BC coils | Genpu Wheels
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post #2 of 36 (permalink) Old 12-20-2016, 09:18 AM
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swaybar link or swaybar mount bushings usually cause this. my old 03 protégé 5 had this issue and we changed the swaybar, swaybar links and swaybar mounts/bushings and it still always did it (changing the links made it quieter) but it never went 100% away. it only ever did it over speed bumps at low speed (unless I just could not hear it at higher speeds) but that is what I would check 1st and if you change the links look up torque specs because over torqueing can cause them to be noisy. its usually only like 35-45 ft pounds.


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post #3 of 36 (permalink) Old 12-20-2016, 06:35 PM Thread Starter
mazda3415
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Sounds good, thanks for the help. I actually just bought the CS RSB and am planning to install it after Christmas, so hopefully the sound goes away after that.

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Originally Posted by kms1990 View Post
swaybar link or swaybar mount bushings usually cause this. my old 03 protégé 5 had this issue and we changed the swaybar, swaybar links and swaybar mounts/bushings and it still always did it (changing the links made it quieter) but it never went 100% away. it only ever did it over speed bumps at low speed (unless I just could not hear it at higher speeds) but that is what I would check 1st and if you change the links look up torque specs because over torqueing can cause them to be noisy. its usually only like 35-45 ft pounds.

2011 MZ3 | Corksport catback exhaust with straight pipe | Corksport SRI | Corksport Stubby antenna | 06-07 STI Lip | Bayson R side skirt extensions and rear lip | Rallyarmor Mud Flaps | DDM 6000k HID | BC coils | Genpu Wheels
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post #4 of 36 (permalink) Old 12-21-2016, 12:31 AM
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+1 endlinks. When youre under the car installing the rsb might as well replace them bc the clunking will only get worse till they fail. Another member on BC's uses Hardrace adjustables
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post #5 of 36 (permalink) Old 12-21-2016, 02:51 AM Thread Starter
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Sounds good, any other suggestions on endlinks? I heard whiteline is also pretty decent.

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+1 endlinks. When youre under the car installing the rsb might as well replace them bc the clunking will only get worse till they fail. Another member on BC's uses Hardrace adjustables

2011 MZ3 | Corksport catback exhaust with straight pipe | Corksport SRI | Corksport Stubby antenna | 06-07 STI Lip | Bayson R side skirt extensions and rear lip | Rallyarmor Mud Flaps | DDM 6000k HID | BC coils | Genpu Wheels
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post #6 of 36 (permalink) Old 12-24-2016, 09:10 AM
kms1990
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well, im stock right now but moog has provided me good suspension stuff. hardrace is good as well, i have used some of their stuff before


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post #7 of 36 (permalink) Old 12-24-2016, 03:33 PM Thread Starter
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I think im gonna install the RSB and retighten the endlinks and anything else down there and see if the sound persist. If it does then ill look towards getting new endlinks.

2011 MZ3 | Corksport catback exhaust with straight pipe | Corksport SRI | Corksport Stubby antenna | 06-07 STI Lip | Bayson R side skirt extensions and rear lip | Rallyarmor Mud Flaps | DDM 6000k HID | BC coils | Genpu Wheels
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post #8 of 36 (permalink) Old 12-24-2016, 04:08 PM
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How low is the car? If it is significantly lower than stock you need shorter end links. When you lower the car you need to restore the swaybar to its original orientation. If you don't and the car is pretty low, it is possible that the outer end of the swaybar can hit the floor pan when the suspension is at full compression. A very loud thump will ensue.
You will need stronger endlinks with a significantly stiffer swaybar. The stock links are not real durable and the additional stress of a stronger bar can break them.

ADJUSTABLE SWAY BAR LINKS FOR MAZDA 3 BK 2004-2009 | eBay

Last edited by arathol; 12-24-2016 at 04:12 PM.
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post #9 of 36 (permalink) Old 12-27-2016, 09:34 AM
kms1990
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Quote:
Originally Posted by mazda3415 View Post
I think im gonna install the RSB and retighten the endlinks and anything else down there and see if the sound persist. If it does then ill look towards getting new endlinks.
Be sure to not over torque them, end links are finicky there should be a shop manual in the how to section here that I would bet has that spec


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post #10 of 36 (permalink) Old 12-27-2016, 10:12 PM
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it's probably endlinks. MOOG's are the best you can get. my post count is too low for links but you can get them from jamesbaroneracing.
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