Suspension clunking (i think) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BRZ'13 · 09-19-2016, 10:18 PM

Been having a weird issue with the car. I think its suspention related

From a stand still if i rev to about 3.5-4k and let the clutch slip i can hear knocking in the rear (barely any if any wheel spin). It certainly does not feel like tire hop but maybe it is? The sound goes away once the car is going over 25km/h. I can re perform the sound everytime from a stop

Not sure if anyones had any similar issues. Thinking it could be axles maybe

Im on cheap coilovers (bc racing), 265 tires with supercharger if that helps

humfrz · 09-20-2016, 12:32 AM

If you were making a turn, I would suspect a rear axle.

But, going straight ahead, I would suspect a drive shaft universal or a bad acting differential.

You may wish to check that your coil overs are bolted down tight.

humfrz

Ultramaroon · 09-20-2016, 02:13 AM

Quote:

Originally Posted by humfrz

If you were making a turn, I would suspect a rear axle.

But, going straight ahead, I would suspect a drive shaft universal or a bad acting differential.

You may wish to check that your coil overs are bolted down tight.

I think OP is saying he's practically launching it. "Barely any wheelspin." It also sounds like he's describing a cyclic/repeating sound until he gets up to a certain speed.

I think OP has a failed CV joint.

RichardsFRS · 09-20-2016, 06:53 AM

I had similar issues and I could feel the clunk too. After investigating; the damn seats were lose from the latch. LOL I know, the obvious right

Tcoat · 09-20-2016, 08:24 AM

You say "on cheap coilovers" but not if you have done the other supporting mods. LCAs or anything else?

humfrz · 09-20-2016, 12:23 PM

Quote:

Originally Posted by RichardsFRS

I had similar issues and I could feel the clunk too. After investigating; the damn seats were lose from the latch. LOL I know, the obvious right

.......that's for not being able to tell the difference ......

humfrz

RichardsFRS · 09-20-2016, 12:51 PM

Quote:

Originally Posted by humfrz

.......that's for not being able to tell the difference ......

humfrz

Shut up old man! At least I could hear it!

kch · 09-20-2016, 12:51 PM

Quote:

Originally Posted by BRZ'13

Been having a weird issue with the car. I think its suspention related

From a stand still if i rev to about 3.5-4k and let the clutch slip i can hear knocking in the rear (barely any if any wheel spin). It certainly does not feel like tire hop but maybe it is? The sound goes away once the car is going over 25km/h. I can re perform the sound everytime from a stop

Not sure if anyones had any similar issues. Thinking it could be axles maybe

Im on cheap coilovers (bc racing), 265 tires with supercharger if that helps

Does it happen on hard braking too? And do you have aftermarket LCAs? Could be them.

humfrz · 09-20-2016, 01:05 PM

Quote:

Originally Posted by RichardsFRS

Shut up old man! At least I could hear it!

WHAT DID YOU SAY ....... ???????

humfrz

BRZ'13 · 09-20-2016, 06:00 PM

Quote:

Originally Posted by Ultramaroon

I think OP is saying he's practically launching it. "Barely any wheelspin." It also sounds like he's describing a cyclic/repeating sound until he gets up to a certain speed.

I think OP has a failed CV joint.

yeah this. if i set off normally, i cant hear it. il try and film it and see if i can get it on tape. only happens on low speeds

BRZ'13 · 09-20-2016, 06:01 PM

Quote:

Originally Posted by Tcoat

You say "on cheap coilovers" but not if you have done the other supporting mods. LCAs or anything else?

only other mod back there is SPC control arms at about 2.3 degrees camber

i cant see it being the coils since its only at low speeds. maybe contributing to the cause?

BRZ'13 · 09-20-2016, 06:02 PM

Quote:

Originally Posted by kch

Does it happen on hard braking too? And do you have aftermarket LCAs? Could be them.

il check under braking and yes SPC lower arms

Tcoat · 09-20-2016, 07:13 PM

Quote:

Originally Posted by BRZ'13

only other mod back there is SPC control arms at about 2.3 degrees camber

i cant see it being the coils since its only at low speeds. maybe contributing to the cause?

I forgot to ask how much drop. Anything over about an 1 1/2 has been known to cause axle issues.

It could also be as simple as needing to tighten the retaining nuts though. I would start with that since you certainly fit the description.

Axle issues - http://www.ft86club.com/forums/showthread.php?t=49511

Nut tightening - http://www.ft86club.com/forums/showthread.php?t=92971

BRZ'13 · 09-20-2016, 08:22 PM

Quote:

Originally Posted by Tcoat

I forgot to ask how much drop. Anything over about an 1 1/2 has been known to cause axle issues.

It could also be as simple as needing to tighten the retaining nuts though. I would start with that since you certainly fit the description.

Axle issues - http://www.ft86club.com/forums/showthread.php?t=49511

Nut tightening - http://www.ft86club.com/forums/showthread.php?t=92971

ok this is certainly the issue. exact description in the second link. lowered + sticky tires + 300whp will do it.

Thank you!

09-19-2016, 10:18 PM	#1
BRZ'13 Senior Member Join Date: Jun 2014 Drives: subaru Location: Hamilton ON, Canada Posts: 375 Thanks: 41 Thanked 92 Times in 67 Posts Mentioned: 2 Post(s)	Suspension clunking (i think) Been having a weird issue with the car. I think its suspention related From a stand still if i rev to about 3.5-4k and let the clutch slip i can hear knocking in the rear (barely any if any wheel spin). It certainly does not feel like tire hop but maybe it is? The sound goes away once the car is going over 25km/h. I can re perform the sound everytime from a stop Not sure if anyones had any similar issues. Thinking it could be axles maybe Im on cheap coilovers (bc racing), 265 tires with supercharger if that helps

09-20-2016, 06:53 AM	#4
RichardsFRS Senior Member Join Date: Dec 2015 Drives: 2013 Pearl White 6MT Location: Gainesville Ga Posts: 938 Thanks: 5 Thanked 356 Times in 246 Posts Mentioned: 13 Post(s)	I had similar issues and I could feel the clunk too. After investigating; the damn seats were lose from the latch. LOL I know, the obvious right __________________ Back from bancation in Banopolis where I laid on the beach with a beer between my legs. I at night and ate at sun rise

09-20-2016, 08:24 AM	#5
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,838 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s)	You say "on cheap coilovers" but not if you have done the other supporting mods. LCAs or anything else? __________________ Racecar spelled backwards is Racecar, because Racecar.

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09-20-2016, 12:32 AM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,436 Thanks: 29,833 Thanked 32,866 Times in 16,849 Posts Mentioned: 717 Post(s)	If you were making a turn, I would suspect a rear axle. But, going straight ahead, I would suspect a drive shaft universal or a bad acting differential. You may wish to check that your coil overs are bolted down tight. humfrz

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