Hello, I just put 19 inch rims on my 350z (19x9F 19x10R Racing Hart CR multipiece) and noticed that my car now wobbles when taking turns at high speed and when i hit a small bump on the highway. I would like to know if i can eliminate this problem with just lowering springs or do i need full suspension?

 

Hmm... I think it's in your head or you're not understanding something. Getting bigger rims than stock won't affect your suspension. The ride is probably just more bumpy now since you went with bigger rims and lower profile tires.

 

Sounds like you may have a camber/toe issue. Sometimes if you go to a larger wheel this happens. If the toe is not aligned then your car would be all over the road. Maybe you should get an alignment.

 

I don't think larger wheels would cause a camber/toe issue.
It may make the issues more noticable tho.
If your wheels are truly "wobbling", you better check your lug nuts.

 

You need to re-torque your lug nuts to make sure they did not loosen up after the initial install. You always want to do this whenever you have taken off the rims and driven a few miles.