I have a set of G S-techs in my garage that I am considering tossing on the rear of my coupe and leaving the Z-springs on the front that I have. I want to bring the rear end down a bit which is why I am considering this. I know about the spring rates on the Teins, but with the stiffer front springs on the front will that offset some of the rear softness when it transfers the roll stiffness to the front?

 

There was a post on this subject sometime back. I was have a problem with my CS coils in the back set to soft. When I set the rear sways to a firmer position it solved that high speed sloppy feeling in the back. I prefer softer springs rates in the first place. I would PM kENCHAN. He knows what he is talking about

 

i'd recommend is you cut a portion
of the rear top spring mount (bumpstop) like how gsedan35 did, and
adjust the height that way.

S-tech rear's for the G is junk. TEIN needs to re-do the spring rate.
don't use those.

 

Good call on the top mount, didnt even think about that thanks.

 

I can offer one word of caution on cutting the rear upper spring seats. Due to their shape and what they are made of, picking a small amount to shave off isn't in the cards. If your going to do the mode, only do so with the knowledge that your going to slice of .8" This will leave about .3" of upper mount pad thickness left. Why is this? They are basically a big ole chunk of car tire (best way to explain it) and .8" is where the only natural cutting guide is. Their's flat out no other way to make a remotely straight cut and cut off any less. When you cut, use a ton of wd40 often as the hacksaw blade will lockup after just so many blade strokes.

Another thought would be to buy a set of Hotchkis springs and run a 3/8" thick poly energy suspension bushing above the upper spring seats as backfill. This should equal the rear drop on a coupe that you'd get with rear
G35 S-techs. You'd also get a linear spring with little rate change vs a coupe running oem 17's or 18's. Granted it's not as cost effective.