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Old 09-14-2021, 09:48 AM   #1
Akrochik
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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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Old 09-14-2021, 02:01 PM   #2
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Could it be a blown damper?
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Old 09-14-2021, 02:12 PM   #3
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+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.
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Old 09-14-2021, 02:15 PM   #4
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Do you have a datalog?
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Old 09-14-2021, 03:18 PM   #5
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Do you have a datalog?
Only what's in TrackAddict but I do have onboard video where you can sort of see the bouncing.
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Old 09-14-2021, 03:21 PM   #6
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+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.
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Old 09-14-2021, 03:23 PM   #7
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I specifically need a datalog to help you. Otherwise, we're just guessing.

Any clunking is not normal.
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Old 09-14-2021, 05:42 PM   #8
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How are your axles looking? Any play in the CV joints when you shake the axle from the middle of the shaft?
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Old 09-15-2021, 09:30 AM   #9
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Would you characterize the bouncing as more of "left to right" or "front to back"?
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