[Ashikabi]

Originally Posted by CatDaddysBBQ

This.

Started the noise after a track day, so i'm not surprised. My clunk happens when I first sit down on the seat, and/or whenever I take a reasonably hard corner - the lateral weight shift coaxes a clunk that sounds like a hard tap to metal with a screwdriver.

Same as you, I can put my hand down and make contact with the rail, and I feel it, and gets stronger the further back I go. But I checked the bolts and they're all REALLY tight, and have NO play in them if I am next to the car and wiggle the seat. Though the wiggling does make the clunk, I don't see anything moving. I also feel a ping underneath the body of the car directly under the seat rail area when I wiggle the seat.

I am planning on diving in to check it out this weekend, when I can have more than 4 minutes to mess with it. Hoping I don't have to remove too much crap to find the culprit, but the bottom of the car ping makes me worry that something between the floor of the car and the underbody area broke hold and there isn't anything to tighten or something... We'll see. I'll report back if I find anything of interest.

Maybe the rail itself is damaged. They are just ball bearing slides. Perhaps the lateral forces of track day bent one