BC Racing extreme drop Coilover Issue - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

SmsAlSuwaidi · 10-16-2013, 03:35 AM

Ive recently installed a set of Bc Racing Extreme drop with 10k springs square and i'm loving the drop on them, the ride is ok considering they are 10k springs, but i seem to have a issue with my front clunking over bumps at low speeds. I do understand metal top hats cause a bit of noise but i'm positive not what im experiencing

VIDEO ( Crappy quality FSR )

you can hear the clunks in the begging and through out the video, i also film the coilovers as maybe i have them setup up in the wrong way
[ame]http://youtu.be/UsCFKB_yAFY[/ame]

my guess its either the top hats are loose or i need to adjust the end links, this was my first adjustable end links install so i didn't know how to properly set them up and just randomly fiddled with them. i looked for marks of them hitting some where but couldn't find any.

Things i'm going to try this weekend is installing back the stock end links( if they would work) and seeing if it solves this, but id like to hear from you guys on how can i fix this and i really hope i don't end up with retarded comments, commenting on the drop or spring rate

@Circuit Motorsports

Circuit Motorsports · 10-16-2013, 12:25 PM

It can be a lot of things, preload, center nut is loose, top nuts are loose, Swaybar endlinks, or contact between two parts (sways, links, exhaust). When you install coilovers tolerances can become tight and sometimes nuts don't get tightened all the way.

The proper way to set preload on a coilover-

-Loosen both lock rings under the spring (spring seat ring(top) and spring lock ring(bottom)) so that the spring is loose and can move up and down slightly.

-Tighten up the spring seat ring so that the spring is snug, but do not tighten it down past simply holding the spring snug, this will be "0" preload.

-Now bring the bottom lock ring up so that it is just touching the spring seat ring, but do not tighten to lock, you will be moving the spring seat ring next.

-Now tighten up the spring seat ring so that you are now preloading (compressing) the spring.

-Measure the distance between the bottom ring and the top ring as you are tightening, once there is a 3mm gap between the two rings, you have 3mm of preload on the spring.

-Tighten up the lock ring to lock your preload in place

-Repeat for all 4 corners.

You also want to check and make sure the top 17mm center nut is tight, it's best to check it with an impact gun if you have access to one, a quick hit is all it should need. Or use an allen key to hold the shaft in place and tighten with an open socket or wrench, you don't want the shaft to spin while you are tightening it. A few other areas to check are the lower mounting bolts, the 4 allen bolts that adjust camber, and the 4 lock bolts underneath the pillowball bearing, make sure all of these are tight.

Sometimes noise can come from somewhere else, endlinks, swaybars, and chassis contact can all be problems. Make sure now that the car is lowered and stiffer that you don't have exhaust contact anywhere. These are all common noise issues.

SmsAlSuwaidi · 10-16-2013, 01:41 PM

@Circuit Motorsports thanks, I will try that this weekend and also I will shorten my endlinks as much as I can.

PolishFrs13 · 03-11-2014, 05:50 PM

Quote:

Originally Posted by SmsAlSuwaidi

@Circuit Motorsports thanks, I will try that this weekend and also I will shorten my endlinks as much as I can.

did that fix the issue ? im going through the same clunking noise right now =\

whitefrs · 03-11-2014, 06:02 PM

i checked all that and still clunks

i have emailed BC and they are helpful but i need some sort of getting this fixed asap

PolishFrs13 · 03-11-2014, 10:31 PM

ive tried everything i can think off.. still doing it =\ looking into another set off coils soon i guess

SmsAlSuwaidi · 03-11-2014, 10:32 PM

Nop they always clunked, im happy that i got rid of them. I might've been to anal about it.

Sent from my IBrick

PolishFrs13 · 03-11-2014, 10:37 PM

yeah im looking into new sets now.. not BC racing though

SmsAlSuwaidi · 03-11-2014, 10:39 PM

Quote:

Originally Posted by PolishFrs13

yeah im looking into new sets now.. not BC racing though

Talk to @CSG David he is great help

Sent from my IBrick

whitefrs · 03-11-2014, 10:39 PM

Quote:

Originally Posted by SmsAlSuwaidi

Nop they always clunked, im happy that i got rid of them. I might've been to anal about it.

Sent from my IBrick

what coil overs did u go with

SmsAlSuwaidi · 03-11-2014, 10:40 PM

Quote:

Originally Posted by whitefrs

what coil overs did u go with

Stock for now !

Sent from my IBrick

whitefrs · 03-11-2014, 10:42 PM

Quote:

Originally Posted by SmsAlSuwaidi

Stock for now !

Sent from my IBrick

Ewww
Needs moar low

I love boost!!!!!!

SmsAlSuwaidi · 03-11-2014, 10:45 PM

Quote:

Originally Posted by whitefrs

Ewww
Needs moar low

I love boost!!!!!!

Needs low 11s first

Sent from my IBrick

whitefrs · 03-11-2014, 10:45 PM

Quote:

Originally Posted by SmsAlSuwaidi

Needs low 11s first

Sent from my IBrick

Lmao

I love boost!!!!!!

10-16-2013, 03:35 AM	#1
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)	BC Racing extreme drop Coilover Issue Ive recently installed a set of Bc Racing Extreme drop with 10k springs square and i'm loving the drop on them, the ride is ok considering they are 10k springs, but i seem to have a issue with my front clunking over bumps at low speeds. I do understand metal top hats cause a bit of noise but i'm positive not what im experiencing VIDEO ( Crappy quality FSR ) you can hear the clunks in the begging and through out the video, i also film the coilovers as maybe i have them setup up in the wrong way [ame]http://youtu.be/UsCFKB_yAFY[/ame] my guess its either the top hats are loose or i need to adjust the end links, this was my first adjustable end links install so i didn't know how to properly set them up and just randomly fiddled with them. i looked for marks of them hitting some where but couldn't find any. Things i'm going to try this weekend is installing back the stock end links( if they would work) and seeing if it solves this, but id like to hear from you guys on how can i fix this and i really hope i don't end up with retarded comments, commenting on the drop or spring rate @Circuit Motorsports Last edited by SmsAlSuwaidi; 10-16-2013 at 03:48 AM.

03-11-2014, 06:02 PM	#5
whitefrs Love Boost!!!!!!!! Join Date: Jun 2012 Drives: Whiteout Scion FR-S Location: Long Island NY Posts: 3,612 Thanks: 429 Thanked 902 Times in 606 Posts Mentioned: 87 Post(s) Tagged: 3 Thread(s)	i checked all that and still clunks i have emailed BC and they are helpful but i need some sort of getting this fixed asap __________________ ༼ つ ◕_◕ ༽つ I LOVE BOOST ༼ つ ◕_◕ ༽つ

03-11-2014, 10:32 PM	#7
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)	Nop they always clunked, im happy that i got rid of them. I might've been to anal about it. Sent from my IBrick __________________ https://www.facebook.com/Smsalsuwaidiracing/

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10-16-2013, 12:25 PM	#2
Circuit Motorsports Senior Member Join Date: Jan 2012 Drives: 2013 Subaru BRZ Location: Orlando, FL Posts: 4,353 Thanks: 294 Thanked 495 Times in 259 Posts Mentioned: 35 Post(s) Tagged: 2 Thread(s)	It can be a lot of things, preload, center nut is loose, top nuts are loose, Swaybar endlinks, or contact between two parts (sways, links, exhaust). When you install coilovers tolerances can become tight and sometimes nuts don't get tightened all the way. The proper way to set preload on a coilover- -Loosen both lock rings under the spring (spring seat ring(top) and spring lock ring(bottom)) so that the spring is loose and can move up and down slightly. -Tighten up the spring seat ring so that the spring is snug, but do not tighten it down past simply holding the spring snug, this will be "0" preload. -Now bring the bottom lock ring up so that it is just touching the spring seat ring, but do not tighten to lock, you will be moving the spring seat ring next. -Now tighten up the spring seat ring so that you are now preloading (compressing) the spring. -Measure the distance between the bottom ring and the top ring as you are tightening, once there is a 3mm gap between the two rings, you have 3mm of preload on the spring. -Tighten up the lock ring to lock your preload in place -Repeat for all 4 corners. You also want to check and make sure the top 17mm center nut is tight, it's best to check it with an impact gun if you have access to one, a quick hit is all it should need. Or use an allen key to hold the shaft in place and tighten with an open socket or wrench, you don't want the shaft to spin while you are tightening it. A few other areas to check are the lower mounting bolts, the 4 allen bolts that adjust camber, and the 4 lock bolts underneath the pillowball bearing, make sure all of these are tight. Sometimes noise can come from somewhere else, endlinks, swaybars, and chassis contact can all be problems. Make sure now that the car is lowered and stiffer that you don't have exhaust contact anywhere. These are all common noise issues.

10-16-2013, 01:41 PM	#3
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)	@Circuit Motorsports thanks, I will try that this weekend and also I will shorten my endlinks as much as I can.

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