I just had my Flexovers w EDFC installed with new wheels and tires, SF Winnings 19x9.5 19x10.5 with SO-3's 245/35-19 and 285/30-19, had rubbing I had a shop cut the inside flares in the back, now they don't rub at all... However I just got back from the track . And at around 130-140 mph when I let off the the throttle. There is a very very slight shake or shimmy, I never had that problem with the stock set up on the same track ... That car is normaly smooth as glass at high speeds.... I think it is a tunning thing, maybe it was not aligned properly, too much toe in, the so-3 are fighting each other? Don't think it's balancing, 60-80 It is smooth. Need Help

Special Thanks too Andrew, Gary and DanZ @ Performance Motorsports in LI home of the fastest 350z in the world (1/4 11:20's)

and my boy Roy McCullough @ Alpine

 

my first thing would be to rebalnce the tires... or double check them and then look into alignment.

did you do a 4 wheel alignment ? that could be screwed up a bit ... and at 120mph even a small % could do that.

where do you feel the shaking... rear or front. Double check you suspension bolts. Proper way is to install it... drive around... check it.... then check after 100 miles and then after 1000. NObody usually does it. But thats how it should be done.

PS - what track was this on. i see you from NY but where is there a track around us.