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Old 02-25-2018, 10:33 PM   #3537
H1C
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Join Date: Feb 2015
Drives: 2014 FR-S MT
Location: metro-Atlanta area
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Curious, did you not get this at all with the Tarmac/B8 setup? I seemed to with Tarmac/B6. After watching some YouTube vids on “flat ride,” I wondered if maybe it was the relative frequencies front vs rear causing it. The car even got into some pretty crazy oscillations over certain bridges. I changed to Swift SpecR springs(softer front, stiffer rear) and it seemed to improve a lot.
Hmm I can't say that I noticed it with the Tarmacs/B8s. But it's certainly possible that I'm just not that perceptive. I also had OEM top mounts and adjustable front LCAs with spherical bearings with that set-up. Maybe those dampened the transmission of suspension movement to the cabin a bit more than my current camber plates and OEM LCAs do.

Very interesting data point about softer front and stiffer rear spring rates helping quell your bobbing a lot. I watched some of Fat Cat Motorsport's YouTube videos a while back -- I remember he talked about flat ride and relative frequencies. Maybe I need to revisit those videos and try swapping my springs front to rear and see if that completely gets rid of my jiggling.
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