Update: Here are some Comparison pics and some mock up pics on my coupe. Coupe has no Engine but with the Spring rate on these puppies the wouldn't flinch anyway.
Ok first up is three struts, 120Y sedan in original specs,Stanza A10\Sunny B310 with Kingsprings KDFL-17 supposedly lower Stanza springs on it, and R31 control arm with S13 knuckle and cusco comp-s coilover.
Specs are:
120y - 660mm from mouning face on top hat to steering arm, 300mm from LCA bush hole to center of ball joint
A10 - 660mm, 320mm
R31\S13 - 570mm, 320mm
Next up is the Castor Bars. I remember someone asking Frank about how long the R31 unit was compared to the Stanza so here's the three
Lentghs:
120y - 380mm to start of thread, 460mm total
A10 - 390mm, 465mm
R31 - 350mm, 430mm
Here's a couple of Test fit pics
As you can see there's a huge problem with this unit causing the control arm to level out, the tie rod doesn't fare much better either. The safest way I can think to solve this is by using another coilover (seems better than chopping up this one to reweld the brackets cos then you still have it's lack of bump clearance if you wind down the spring. The other way to slightly fix this and relocate the swaybar link off the castor bar would be to mount the arm further out and mabey up a fraction. I'm not a facebook fan of that unless the angles are corrected otherwise it's a waste of time. Speaking about the castor bar though, what do you think about knocking one of those studs out and getting a super chunky swaybar link\super bolt?
And finally here's the ride height with my 185\60 R13 Toyo Proxies which coincedently I found this wheel has a slight buckle >_<