I have a 06 g35x while driving it feels like all the tires are flat then after a few minutes it will go away, I know you guys have been asked this question before, I have searched the web trying to find an answers with no luck at all! I have had the tires balanced and a alignment, If it was a a balance issue it would do it all the time I'm stumped, Any ideas? Thanks for your time guys

 

is this a daily driver or does it sit for a while? Tires will flatten a spot if they sit a bit; once they warm up, they will "soften up" and the flat spot will smooth out. What''s the manufacturer date on the tires? If they are more than 6 years old, the rubber has lost its elasticity, and they will be more prone to get the flat spot quicker, and hold the flat spot longer. Any tire over 6 years, especially on a performance vehicle, should be replaced. Its no longer safe, and when it loses its grip in a corner, it will be sudden. You don't want to be sliding that way. VDC will only take you so far.

 

It's my daily, I just bought the tires not even 2 months ago! I don't understand why it does it only sometimes it litterly sounds like a helicopter and feels like every tire on the car is flat then it just goes away! Makes no sense at all lol it coukd be and cv where it's all wheel drive if it was tire related it would be doing it all the time it could be overly tightened lug nuts or lug nuts not tight enough but I checked them pretty good maybe I over looked something next time it does it I'm gonna slap it in neutral to see if it still does it, transmission acts perfectly normal but some guys said it could be something to do with the trans but it could be a cv axle going bad or lose idk man I'm puzzled

 

Sounds like your ABS system is turning on.

Does this ALWAYS happen as soon as you hit 10mph after starting the car. There is a ABS/VDC diagnostic check that happens every time the car hits 10mph after being started, there will be a 1 second long "faint grinding" sound coming from the engine bay, and if you hit the brakes during that time it will feel very different because the ABS pump is engaged and making that sound.