Anyone has them on the car? hows the ride quality? I hope it can improve the bounce on my car. I am not opting for eibach because of the camber problems. Seems like these 2 brands are not low enough for camber adjustment. Appreciate any inputs!

 

I have the RS*R spring and like them. You are correct about not having a problem with camber being outside factory spec.
These springs are not much stiffer than stock and the bounce problem is less, but the ultimate solution to that is new shocks and I will be getting KONI's when they come out.
It is hard for me to quantify the spring change alone since I put on Cusco sway bars at the same time. The springs and bars together made the car handle much better and feel lighter on the road.

 

I have the Tein S-Tech springs on my Z. I used the springs for the G35 which has lower rates than the ones for the Z. The ride is somewhat improved but I feel the big problem is the struts/shocks and the OE tires. I have G35 cpe struts waiting for me at the Infinity dealer and will be installing them Friday. If that dosen't give the solution Tires will be my next move.

 

Many of us are awaiting the release of the SA Koni Sport shocks due out early next year. Our own dwnshift aka BJ should have a set on his street Track model by the end of the week. He will give us the low down. They are designed to work with the stock springs.

 

looks like the only way to kill the bounce is to change shocks
i was looking at springs cos they cost less than a full set of shocks, now i am just pissed to have to spend more money to fix something thats not supposed to happen