Suspension bouncing on long right hander - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Akrochik · 09-14-2021, 10:48 AM

My car was doing something odd on track in my last session. There's a long med/high speed right hander with a lot of camber and many times in that corner my car did a sort of rhythmic bouning when I was around 33% throttle. This in the second half of the lightbulb at NJMP lightning, for those familiar.

Is this porpoising? Anything I can do to address? Thanks!

2013 FRS
Tein Flex Z coilovers set to about 66% of the way to full firm
1" lower than stock
Stage 2 tune and bolt ons

Pat · 09-14-2021, 03:01 PM

Could it be a blown damper?

strat61caster · 09-14-2021, 03:12 PM

+1 play with the damper knobs and see if you can find an improvement.

Assuming there's nothing bound up or worn out on the suspension.

CSG Mike · 09-14-2021, 03:15 PM

Do you have a datalog?

Akrochik · 09-14-2021, 04:18 PM

Quote:

Originally Posted by CSG Mike

Do you have a datalog?

Only what's in TrackAddict but I do have onboard video where you can sort of see the bouncing.

Akrochik · 09-14-2021, 04:21 PM

Quote:

Originally Posted by strat61caster

+1 play with the damper knobs and see if you can find an improvement.

Assuming there's nothing bound up or worn out on the suspension.

Coils are about 9 months old and the ride is pretty compliant in general so I'd be surprised if a damper has failed already. But I'll take a look.

I do get a front suspension clunk when reversing out of the driveway with the wheel turned after the car sits for a while but it's been doing that for a long time. I'll check if anything has any play.

CSG Mike · 09-14-2021, 04:23 PM

I specifically need a datalog to help you. Otherwise, we're just guessing.

Any clunking is not normal.

norcalpb · 09-14-2021, 06:42 PM

How are your axles looking? Any play in the CV joints when you shake the axle from the middle of the shaft?

femaledog · 09-15-2021, 10:30 AM

Would you characterize the bouncing as more of "left to right" or "front to back"?

Akrochik · 04-03-2023, 01:16 PM

Thanks to all that tried to help. Going full firm on the dampers fixed it. The clunk was fixed when I greased the end link fitting

09-14-2021, 10:48 AM	#1
Akrochik Member Join Date: Jul 2018 Drives: Golf TDI for now Location: Nj Posts: 19 Thanks: 0 Thanked 4 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Suspension bouncing on long right hander My car was doing something odd on track in my last session. There's a long med/high speed right hander with a lot of camber and many times in that corner my car did a sort of rhythmic bouning when I was around 33% throttle. This in the second half of the lightbulb at NJMP lightning, for those familiar. Is this porpoising? Anything I can do to address? Thanks! 2013 FRS Tein Flex Z coilovers set to about 66% of the way to full firm 1" lower than stock Stage 2 tune and bolt ons

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09-14-2021, 03:15 PM	#4
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,562 Thanks: 8,942 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	Do you have a datalog?

09-14-2021, 04:23 PM	#7
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,562 Thanks: 8,942 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	I specifically need a datalog to help you. Otherwise, we're just guessing. Any clunking is not normal.

09-14-2021, 06:42 PM	#8
norcalpb Senior Member Join Date: Oct 2013 Drives: 2013 BRZ, 2023 Model 3 Location: SF Bay Area Posts: 2,341 Thanks: 1,254 Thanked 899 Times in 589 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	How are your axles looking? Any play in the CV joints when you shake the axle from the middle of the shaft?

09-15-2021, 10:30 AM	#9
femaledog Member Join Date: Sep 2017 Drives: 2017 BRZ Perf. Pkg. Location: NYC Posts: 70 Thanks: 95 Thanked 33 Times in 25 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Would you characterize the bouncing as more of "left to right" or "front to back"?

04-03-2023, 01:16 PM	#10
Akrochik Member Join Date: Jul 2018 Drives: Golf TDI for now Location: Nj Posts: 19 Thanks: 0 Thanked 4 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks to all that tried to help. Going full firm on the dampers fixed it. The clunk was fixed when I greased the end link fitting

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