Hi all, I recently noticed my G37 is starting to violently shake when accelerating up between 80-85mph. It starts out as a vibration then turns into a up and down shaking motion. The shaking feels like its coming from the front end of the car and when I accelerate past that range the car will stop shaking and drive normally again. Any time I drive below that speed the car also performs perfectly. Anyone have any idea what this could be? Mounted new tires today but is still happening so I don't think its a tire balancing issue. Any help is appreciated!

 

Balance your wheels, also check if you have any bubbles

 

Could be a bent wheel. One of my IPL was bent and caused bad shaking at same speeds.

 

Is your car AWD or is it RWD?

Have you had it inspected for loose bolts or bad/worn parts?

 

Could be the control arms too. Or transaxle. Happened to a small batch of Gs depending on the year: https://infinitig37.com/TSB/ITB11-019.pdf