I have this vibration in the my g35. It is just around 60 mph cruising. I can feel the steering wheel so I'm looking in the front end. It used to get REALLY BAD when braking between 35 and 30 mph.

I found my compression rod bushings cracked both sides. Replaced those. Got an alignment. It was still there. I've got the sedan on 350z springs and run a bit of neg camber. Camber kit in back but not the front. So it was time for tires. Got new tires and still there.

Labor Day weekend I replaced the shocks on all 4 corners and redid the brakes (turned rotors and new pads). I noticed the LCA bushings where the shock went into was cracked (both sides again) so I replaced those while at it.

Alignment again. (I think the previous alignment was off also, and thus shop confirmed it was out in toe in the back.). The set the toe to zero and brought camber correct in the rear. But still out on the front (more so on the right side, which has always been more out than driver's side.)

Car was running like a dream, but noticed the vibration at 60 mph coming back slightly and seeming to grow again.

I was going to swap tires front/ back and see if that made a difference. And double check torques on main bolts.

Anyone have any ideas of other things to check?

 

You've spent $$ for new tires but haven't got a camber kit for the front, why? Here's my suggestion get the SPL adjustable a-arms (so you don't destroy your new front tires) while you're having those installed have them check the rest of your front suspension along with wheel bearings. Most common vibration causes are balance/alignment and warped rotors, you've got those covered! Good Luck, keep looking...Gary

 

i've been chasing a vibration over 60mph.. what's your PSI? i found that if i set it to 32 or below it helps a lot...

also.. I am on stock height and i basically replaced everything with OEM parts..shocks, LCA, compression rod, hub/bearing, rotors/pads..

Have you checked your knuckle ball joints, inner/outer tie rods, shock mounts? these are probably the only things I haven't changed in my front suspension.. I want to do my knuckle ball joints next.. I regret not doing the shock mounts when I was doing the shocks..

 

If you're using aftermarket wheels do you have hub centric rings? Those made a major difference on my car with my winter wheels would vibrate 70+.

Bent wheels?

 

Stock wheels. I figured if I swapped wheels front/back and the vibration changed (steering wheel to more body vibe) it would indicate the wheels were suspect (bent?). If it moves, I was going to get them rebalanced and see if that does anything.

It isn't that bad out of camber. After getting the rear kit, they just wear a bit uneven. But not too bad. I went with Nitto Neo Gen tires this time. Supposedly they're better for negative camber. Also, they aren't directional, so I can rotate left to right and spread the wear a bit more. But yes, front camber kit is on my radar.

I didn't do the shock mounts. I checked the bearings when I had the rotors off. They seemed fine. I also checked the lower ball joints when I replaced the LCA. And the tie rods seemed solid as well. I will play with the psi. But I'd wager the vibe is still there but just not as noticeable from doing that.

The thing confusing me right now is that it was fine after the last round of work. But it seems to be coming back. Makes me think something is loosening. But not sure what that'd be.