Does anyone else have this problem? Is it the bushings? When I corner (I have tein flexes and 255/275) hard, there is an odd feeling like there is some flex between the chassis and the wheels, almost like the wheels are moving slightly laterally independently of the chassis in the rear. Can this be cured with stiffer bushings?

 

Tire pressure low?

 

hmm, good theory. I'll check, but I just mounted these last month so I don't think that's the case.

 

What tires are you running?

 

sumitomo HTR-Z III 255/40/18 275/40/18

 

YES! I experienced the same damn thing and it freaked the **** out of me the first time around.
It did this for me when I was getting onto the 407, making a slight right the first time. Ever since, I've noticed it does that at higher speeds while turning.
is it the same for you? is yours an 03?

EDIT: I'm not sure if we are both experiencing the same thing, but it feels like the front corner of the car twitches or hops?
I'm running Goodyear Eagle F1 GS-D3, and when it first did it, I was running Bridgestone RE-11s. It did it with both setups. Its definately not the tires.

 

Could be the suspension is not set to the right stiffness and you could be understeering (plowing)

Also check your alignment - it can make a huge difference if it is off. Another thing could be check the sway bars and the bushings and make sure they are on tight.

 

I get the feeling when its just starting to understeer but its more at the rear, it almost feels like the sidewalls are flexing, but I know its not the tires. I don't have aftermarket sways, but I'll try stiffening up the edfc and checking the bushings

 

Some runflats are known to cause this issue too... but I dont think sumitomo are runflats.