Well guys I thing my calculations have been rewarded. I just got done with the install yesterday. PITA trunk covers and plastic! The front took about 30 mins per side. The rear took about 2Hrs...lots of paneling to remove and I had to leave the wheel well covers off so I can play with the damping adjustment.
-Lexus must have used the same spring rate as the 350 but just cranked up the compression and rebound damping because the new stiffer springs offer tremendous control but no jarring impacts on small bumps.
-You feel a lot more of the road but the pillowball uppers also transmit slightly more high frequency noise from the road.
-While cracks in the road are still felt, the damping makes them less of an impact and more of a blip.
-My favorite canyon run was pretty exciting, even with snow tires. Previously I felt like I had no grip and was washing about, attributing it to the snow tire characteristics. But now I think it was more a combo between the snows and the soft springs.
-I am on somewhat stiff settings, 9 clicks from full hard, and pretty happy with the ride quality.
- I may want to make my own damping gasket for the interface between the chassis and the crown of the coilover just to filter some of that high freq noise, but other than that I am pretty stoked.
I will take some measurements and video for you guys. I have a vid from last night, but my canyon runs I ran out of mem space.
Full install DIY to come also.