See My car below. If I take a turn like this will the spring in the r. rear float in the shock body and come back to rest on the perches after the shock compresses back? does it float in the shock body when shock is extended like that?

 

If you have a swaybar, the spring will never fully unseat, unless you jump the car and get both wheels on the same axle off the ground at the same time.

 

i have a sway bar. Its stock 16 or 18 mm I think but I am visualizing the shock extending and the top of the spring coming undone from its seat underneath of the shock tower.

 

At the point that the spring runs out of extension, the sway-bar should hold the wheel up and the tire should lift off the ground (three-wheelin'). If the swaybar is really soft, the weight of the wheel and control arms can cause the wheel to droop further allowing the spring to come unseated.

If your REALLY concerned about this, you can add a set of helper springs which will take up the slack at this point. Prepare to spend around $100 for two 2.5" inner-diameter helper springs and the matching spring couplers.

Also, you can add a stiffer rear sway-bar, but this will also change the handeling of the car.

PS: Don't get zero-rate helper springs confused with tender springs (which actually have a rate)...

Sample image (not eibach):

 

would a custom eibach spring "shorter than stock" come undone at all if the wheel is fully extended?

 

That would depend on the rate and length. Either way, you cannot be lowered and/or stiff without the springs comming undone. That is unless you go to a set of those so-called "full body coilovers" that allow the length of the shock to be adjusted to change ride height (instead of the spring perch)...

Just beware. There's a lot of CRAP available out there. I think PIC is the only company that has a good Honda-Tech rep available to talk to...

 

Here's what I want to experiment with..... Koni sport all around with front stock springs (250lb) lowered on Koni's lowest perch. Then on the rear, eibach 350 lb stock-height spring on lowest shock perch or 1" lower springs on the middle perch of a Koni shock.

Keep in mind im currently running stock shocks all around with front 250lb rate and rear 150lb spring rate. What do you think? Its a stock engine looking for a considerable improvement in handling.