[Tatsu333]

It appears that nobody is maintaining this topic anymore (I.E. updating the info on the first page), but if anyone can update it with this info, great!

I inquired with ST Suspensions what the spring rates of the ST XA coilovers are, and they are 230 lbs./in. (4.1K) front and 285 lbs./in. (5.1K) rear. They will lower from 0.8 - 2.0" front and rear.

According to the documentation, the XTA's (with the front camber plates) are 6.1K front and 5.1K rear, and also drop from 0.8 - 2.0" front and rear.

NOTE: technically, KW and ST list their spring rates in N/mm. The XA's are 40 N/mm front and 50 N/mm rear, while the XTA's are 60 N/mm front and 50 N/mm rear. Weirdly, the XTA's front springs are 30mm shorter than the XA's if the documentation is correct. I can't understand why that would be...

EDIT: I also looked up the documentation for KW coilovers.

For the V1's and V3's, the springs for both are listed as 40 N/mm front and 50 N/mm rear (approx. 4.1K / 5.1K), which doesn't match what's on the first page of this topic for the V3's. Both will also lower 0.8-2.0" front and rear.

For the Clubsport 2-way and 3-ways, the springs for both are listed as 60 N/mm front and 70 N/mm rear (approx. 6.1K / 7.1K), again with lowering ranges of 0.8-2.0".