Rear BC BR coilover making noise - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

PB-GT86 · 09-15-2013, 06:53 AM

Hey guys after some help. Over the weekend i installed some BC BR coilovers to my ft86 and when i went for a test drive i am getting some knocking/clunk sound coming from both rears. I have gone over all bolts ect and also re-did the preload to 5mm but noise still persists. I can reproduce the noise by pushing up and down on the boot area but if i put the dampening to full soft it doesnt make the noise :S

Any help would be much appreciated.
Thanks in advance

wes1202 · 09-15-2013, 08:26 AM

i think this would be the pillow ball top mount

PB-GT86 · 09-15-2013, 08:44 AM

Quote:

Originally Posted by wes1202

i think this would be the pillow ball top mount

The rears are rubber upper mounts

Dezoris · 09-15-2013, 12:35 PM

Diconnect rear sway bar links from sway bar ends zip tie and test drive and see if it goes silent.
This was my issue as links were bad and bolts stripped from factory. Lowering made them clunk.

SmsAlSuwaidi · 09-15-2013, 02:29 PM

Or maybe it's the trunk noise issue just getting worst after lowering the car

Asphaltfrs1 · 09-15-2013, 07:48 PM

It's definitely the Coilovers. Had these on my last car, so annoying. Eventually just removed them and sold them. I ended up buying the tarmacs for this car and don't suffer from any noises.

TOZER · 09-15-2013, 08:00 PM

had bc's on my old mazda 3 and they were noisy

PB-GT86 · 09-16-2013, 09:21 AM

Would twisting the coilover to adjust height cause the top nut to loosen??

SubiePig · 09-16-2013, 12:27 PM

My KW's did this after a few hundred miles, the nut on the top mount backed off a bit. Take the rear coil off and see if the nut is loose. They can be annoying to get tight enough cause the strut will try and turn with the nut. Pretty sure that the mounts also have a dot indicating which side faces forward, if that makes any difference.

PB-GT86 · 09-24-2013, 09:27 PM

Still haven't figured out the issue. Spoke with the supplier and will be sending back the rears for inspection.

Its just wired that when I put one of the rears on full soft the noise goes away but as soon as I turn up the hardness it comes back :S

Now I will waiting patiently to see what BC find wrong with the coils!!

SmsAlSuwaidi · 09-25-2013, 12:44 AM

i'll be installing mine this week hoping i dont run into this issue

GTB/ZR-1 · 09-25-2013, 07:17 AM

Great info in this thread. I'm chasing a clunking noise too, along w/ some rear instability @ the limit--I'll check the top nuts on the C/O & the sway bar links.

Thx gents...

NemeGuero · 09-25-2013, 01:07 PM

I doubt its your coilovers. I had BC's sold them and bought a new brand after trying several things including tightening the top nuts, and triple checking all torque specs.. even had my wrench calibrated.

My noise is still there with the new coilovers. adjusting dampers doesn't change my noise, nor does raising the car. The noise does go away with stock suspension, however.

I have been underneath the car with a stethoscope searching for the source of the noise, I've made rubber gaskets for the top hats, over tightened the LCA bolt, disconnected the coilover and checked through the range of motion to see if it was something interfering.. Nothing.

I'm waiting to try subframe spacers and see if that cures me.

PB-GT86 · 10-13-2013, 12:43 AM

Installed some rear sub-frame bushes to see if that would fix the noise on the rear...did not help at all!! I have ran out of ideas

09-15-2013, 06:53 AM	#1
PB-GT86 Member Join Date: Aug 2012 Drives: White GT-86 Location: Western Australia Posts: 30 Thanks: 0 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Rear BC BR coilover making noise Hey guys after some help. Over the weekend i installed some BC BR coilovers to my ft86 and when i went for a test drive i am getting some knocking/clunk sound coming from both rears. I have gone over all bolts ect and also re-did the preload to 5mm but noise still persists. I can reproduce the noise by pushing up and down on the boot area but if i put the dampening to full soft it doesnt make the noise :S Any help would be much appreciated. Thanks in advance

09-15-2013, 12:35 PM	#4
Dezoris Senior Member Join Date: Aug 2012 Drives: FR-S Location: IL Posts: 2,857 Thanks: 519 Thanked 2,998 Times in 1,095 Posts Mentioned: 159 Post(s) Tagged: 1 Thread(s)	Diconnect rear sway bar links from sway bar ends zip tie and test drive and see if it goes silent. This was my issue as links were bad and bolts stripped from factory. Lowering made them clunk. __________________ SAVAGEGEESE

09-15-2013, 02:29 PM	#5
SmsAlSuwaidi Boosted Join Date: Feb 2013 Drives: Not a supra....yet Location: Riverside,CA/ Abu Dhabi,UAE Posts: 2,925 Thanks: 487 Thanked 1,203 Times in 812 Posts Mentioned: 90 Post(s) Tagged: 2 Thread(s)	Or maybe it's the trunk noise issue just getting worst after lowering the car __________________ https://www.facebook.com/Smsalsuwaidiracing/

09-15-2013, 08:00 PM	#7
TOZER Senior Member Join Date: Apr 2013 Drives: 2013 Whiteout FR-S Location: Brantford,Ontario Posts: 271 Thanks: 32 Thanked 93 Times in 61 Posts Mentioned: 10 Post(s) Tagged: 1 Thread(s)	had bc's on my old mazda 3 and they were noisy Last edited by TOZER; 03-01-2017 at 11:10 AM.

09-16-2013, 12:27 PM	#9
SubiePig Senior Member Join Date: Apr 2013 Drives: -'02 PSM WRX, '94 Miata, '13 BRZ Location: Lafayette, Louisiana Posts: 438 Thanks: 188 Thanked 155 Times in 112 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	My KW's did this after a few hundred miles, the nut on the top mount backed off a bit. Take the rear coil off and see if the nut is loose. They can be annoying to get tight enough cause the strut will try and turn with the nut. Pretty sure that the mounts also have a dot indicating which side faces forward, if that makes any difference. __________________ Sponsered by:Chasebays/Corr Performance Tuning/KartBoy/Bad Panda Motorsports/Racer-X Fabrication STX Build thread 14th/67 SCCA Nationals (2014)

09-15-2013, 08:26 AM	#2
wes1202 Member Join Date: Jul 2013 Drives: 86 Location: mnl Posts: 31 Thanks: 0 Thanked 3 Times in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	i think this would be the pillow ball top mount

09-15-2013, 07:48 PM	#6
Asphaltfrs1 Senior Member Join Date: May 2012 Drives: 2013 asphalt fr-s Location: Los angeles Posts: 488 Thanks: 109 Thanked 125 Times in 88 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	It's definitely the Coilovers. Had these on my last car, so annoying. Eventually just removed them and sold them. I ended up buying the tarmacs for this car and don't suffer from any noises.

09-16-2013, 09:21 AM	#8
PB-GT86 Member Join Date: Aug 2012 Drives: White GT-86 Location: Western Australia Posts: 30 Thanks: 0 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Would twisting the coilover to adjust height cause the top nut to loosen??

09-24-2013, 09:27 PM	#10
PB-GT86 Member Join Date: Aug 2012 Drives: White GT-86 Location: Western Australia Posts: 30 Thanks: 0 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Still haven't figured out the issue. Spoke with the supplier and will be sending back the rears for inspection. Its just wired that when I put one of the rears on full soft the noise goes away but as soon as I turn up the hardness it comes back :S Now I will waiting patiently to see what BC find wrong with the coils!!

09-25-2013, 12:44 AM	#11
SmsAlSuwaidi Boosted Join Date: Feb 2013 Drives: Not a supra....yet Location: Riverside,CA/ Abu Dhabi,UAE Posts: 2,925 Thanks: 487 Thanked 1,203 Times in 812 Posts Mentioned: 90 Post(s) Tagged: 2 Thread(s)	i'll be installing mine this week hoping i dont run into this issue

09-25-2013, 07:17 AM	#12
GTB/ZR-1 Senior Member Join Date: Oct 2012 Drives: '13 BRZ in WRB--let's mod!!! Location: Central, FL Posts: 1,224 Thanks: 317 Thanked 449 Times in 262 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Great info in this thread. I'm chasing a clunking noise too, along w/ some rear instability @ the limit--I'll check the top nuts on the C/O & the sway bar links. Thx gents... __________________ * ‘23 Corolla GR—AutoX/DE toy * '13 Toyobaru P&L Turbo WRB BRZ SCCA XS-A build starting. SOLD * '22 Z51 Vette--sold. * '09 Nissan GT-R--gone, but not forgotten... 10.63 @ 131+ on streeties. * '90 ZR-1 11.0 @ 130.2 & 11.2 @ 132.4 sprayed 120 shot.

09-25-2013, 01:07 PM	#13
NemeGuero Banned Join Date: Aug 2012 Drives: FR-S Location: Seattle, WA Posts: 459 Thanks: 42 Thanked 122 Times in 95 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	I doubt its your coilovers. I had BC's sold them and bought a new brand after trying several things including tightening the top nuts, and triple checking all torque specs.. even had my wrench calibrated. My noise is still there with the new coilovers. adjusting dampers doesn't change my noise, nor does raising the car. The noise does go away with stock suspension, however. I have been underneath the car with a stethoscope searching for the source of the noise, I've made rubber gaskets for the top hats, over tightened the LCA bolt, disconnected the coilover and checked through the range of motion to see if it was something interfering.. Nothing. I'm waiting to try subframe spacers and see if that cures me.

10-13-2013, 12:43 AM	#14
PB-GT86 Member Join Date: Aug 2012 Drives: White GT-86 Location: Western Australia Posts: 30 Thanks: 0 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Installed some rear sub-frame bushes to see if that would fix the noise on the rear...did not help at all!! I have ran out of ideas

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