Bouncing on high speed right-hander on track
 

My car was doing something odd on track in my last session. There's a long 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. Is this porpoising? Anything else 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

What swaybars are you running?

Suspension is stock besides the coils

Could be lots of things. Maybe a read thru this can get you started
https://grassrootsmotorsports.com/ar...-to-cure-them/

Sent from my SM-G960U using Tapatalk

Have a datalog?

I have the outputs from TrackAddict but I imagine you're looking for something more detailed.

I do have onboard video if that's helpful.

Its your shocks. FLEX-Z are a relatively cheap twin tube with a lot less bump travel than OEM. Turned up stiff enough to avoid wallowing and they'll bounce due to inadequate low speed rebound. Turned down to avoid bouncing.. and it wallows.

Make sure you have lengths adjusted so you're staying off the bumpstops. Raising the car will likely reduce the bouncing.

Swaybars are not the source of the oscillation and have nothing to do with it so ignore that.

Any adjustable shocks should always be set to the softest possible setting that controls wallow. No stiffer than that. Poorly designed shocks will often start to bounce before the wallow goes away so you can never find the right setting.

Critical damping is critical

tru dat

Never experienced that in the couple seasons I ran Flex Z's, though I also didn't have a corner like what you described. Don't think ride height is the issue.

As long as OP hasn't done something to reduce bump travel I'd agree, one of the advantages of the 2-piece coilovers is they can keep the stiffness consistent at various heights. On another coilover or if the OP has reduced bump travel by lowering the spring perch and is using more bump stop due to a lower height then yes, ride height will matter for handling bumpy pavement.