From all of the suspension setups I have seen for the EVO, I believe your spring rates are off. The stiffer rear springs could be a major cause to your over steer problem. If the springs are the same size, as in most coil overs, I would swap the fronts to the rear. This will soften the rear and make it less prone to rotation.

After the swap you may consider a rear sway bar at a medium setting to get the car to be a bit more neutral.

Finally, what are your camber and toe settings? These will contribute greatly to the overall effects of your suspension.

Your cornerweighting is great!

My 2 cents.

Paul

 

You are on the right track (no pun intended ). Some of the "pros" have gone to a rear rate that is higher than the front to solve the Evo understeer issue. Some use a stiff rear bar instead. But the requirement with any approach like that is the car and driving style must to be set up for it...and every car and driver are different. Here is some info on the stiff rear setup:

https://www.evolutionm.net/forums/sh...d.php?t=175597

 

The Bilstein PSS9's have a higher spring rate for the rear too. Don't remember if you mentioned what your set-up is for...track/ autocross. I autocross mostly, and normally, I run the front at 7 (9 being the softest) and anywhere from 1 - 4 in the rear (1 being the hardest) depending on the course. I run the same for the street usually. IMO, running the same setting front and rear is fine for the street, as long as you are not driving really aggressively. My suggestion is try running a little softer in the front and start in the middle of your adjustment range for the rear and take notes. After a day or two, adjust it up one (stiffer) in the rear. It could take a little time, but you can look back at your notes, and go from there. Just my .02, hope this helps.

Dennis