I just dropped on 350z H&R sport springs and as they have settled this week I am having the same problem. I am on 20x8.5 +20 and 245/35/20. I already have my front fenders rolled, but I am still rubbing a little bit on the fender. I am also rubbing on the front of the wheel well where the bumper is mounted, so can you explain more how you fixed it?
I think I am going to have my fenders pulled some and hope that helps, but I will still have the rubbing on the front of the wheel well. I didn't want to have to go to a 30 series or a narrower tire really, so if there is another fix that would be great.

 

^shocks might be nearing the end of its life and tires are too tall.
When you pull the fenders your wheels will tuck more

 

Stiffen up your struts unless you are running stock struts... What camber are you running too?

 

stock struts. I need to get a-arms, so my alignment is out right now. I think I am about 1deg too negative. But won't running less negative camber only make my problem worse?

 

Front camber arms wont do you any good
Shocks are too soft thats why the tires are eating the fender liner
Also trim the metal piece that holds the fender and bumper. Youll see it sticking out when you peel the fender liner

 

Ok thanks guys. I'll try trimming that this weekend

 

Sorry I didn't see this thread was still going. I bent the bumper bracket up and backwards. QUick fix until i can do a little grinding. I also smoothed down the part my bumper that was sticking out as well. Let me know if you need more info.