I talked to Stance on the phone & it deletes the need for the rear spring bucket to hold an actual spring. I bought coil overs. The Stance GR+ from thmotorsports.com. Is there something wrong with this too?

 

No..you're gonna get a true coil over on the rear...no spring in the bucket.
I think you're gonna find these pretty stiff as far as ride quality...but, if you want a slammed car, it will work very well. I would have gone the Eibach Pro Streets (KWV1)...can get em shipped for $916. They are OEM rear style though. Let us know how Stance works out.

 

I don't wan't my car slammed I simply wanted about an inch or even .8 lower with better than stock handling. The price was synonymous & I can get make any adjustment I want. Filtering all the info I honestly think that even though our springs are stock they start stiffer 314 vs 296 & end stiffer 386. That initial extra give may give it the inertia to travel further than the OEM. Or I could have just got a special set of springs. The infinity dealer I go to has Eibach stuff in the window marked up 1000% & the display model for the sway bars has welds that are not even intact. Maybe Eibach is cutting corners with the economy. Hey, I will give a full review of the Stance & I'm giving Eibach the chance to do something.

 

Found this..take it for what it's worth:

https://my350z.com/forum/brakes-and-...o-stiff-2.html

purchased the Stance GR+pro coil overs and after lowering.. not slamming, (no rubbing) The car is WAY to stiff and bounces all over the place (rear only) like if i was ridding on bump stops or like if i cut springs to lower. its horrible. buddy of mine recommended replacing the spring in the coil over with SWIFT springs. I never heard of those but web site looks good. I need help. The car is dropped right above the tire both front and rear, again nothing extreme. 19in wheels 285 35s rear. HELP

Specs off of Stance web site

672lbs front
336lbs rear (True coilover rear)

Working the math to show how much spring reachs the front tires and the rear tires
318lbs front
316lbs rear

This is how much spring you'd have to run IF the rear springs were in the oem location in the rear control arms 750lbs. So, I think you've got a lot more rear spring stiffness then you realize with the setup.

IMO:

Turn damping to the softest setting front and rear and test.
Verify that all springs are set to minimum preload
If all springs are set a min preload, verify rear bump travel with a zip tie on one or both rear damper piston shafts.

Another thought, call Stance tell them your feelings and request a deal on 2 280lbs rear springs it would have the following effect.

280lbs at the damper
263lbs at the tire
or equal to a 625lbs spring in the oem rear location