Not my data, but they've all been posted publicly before so sure.. Bilsteins were dynod by Stuart Maxcy IIRC, Konis & OE dampers by a member of another forum. Compression is on the top in all plots, rebound on the bottom. The Koni/OE plots show a full hysteresis loop, unfortunately the Bilstein...

From your spring rates, I gather you have a non-Brembo car? Funnily enough, the rear Bilsteins are nearly identical in damping to the OE Brembo/TP dampers - actually have a bit less compression than stock - if the dyno charts floating around are to be believed. Yet almost everyone who gets them...

Springs still available (these are from a reg. Boss, not LS, correct?)?Curious what shipping is to 20874 (MD) if so...

Sounds exactly like what my '13GT does, stock. Only mine starts at ~65 mph.Dealer replaced my pinion bearing (twice, after not properly setting the pre-load 1st time), and I'm highly suspicious they didn't clock the DS right putting everything back together. Other than that, I plan to check...

Geez... I've looked at that testing chart probably a dozen times now over the course of a couple years without ever catching that the "Rate at position" column numbers at ride height are significantly lower than if you calculate the force deltas yourself.Thanks for spelling it out!

I know this is an older thread, just curious if this is updated information from somewhere? I've seen rates of ~200/165 quoted for the P springs up until now. Including, I think, Vorshlag's testing (I have no test data myself to contribute/confirm).

I know this is a few months old, but do you have any driving impressions after having the P springs on for a while?I know Sam Strano advocates for the STR.T/Steeda Sport (linear version) combo as a daily driver setup, but you obviously weren't too happy with it. Did the P's make a significant...