I recently bought a 350 F sport. Dealer states its normal, but dont feel normal. Basically, when you make a sharp u-turn (turning the steering wheel all the way), I feel and hear front tires grinding against the ground. I know on some cars that front tire squeels when make sharp U-turn, but my tires does not squeel but makes grinding noise.

 

Rubbing on the ground - new tires , condition / porosity of asphalt, concrete, dry / wet - speed you go into turn - at long it is not rubbing the inner fender - it's "normal" - its called friction. It's a good thing -

 

yea it feels like your rolling on the sidewalls right? i think its normal since i felt the same on the 2nd generation...never got out of the car to see if it was really rolling on the sidewalls tho...

 

sounds like your tires are very soft or under inflated just my .02

 

Good point-should have called that out also.

 

Its not under inflated because I checked all my 4 tires at 36psi

 

yea i always keep my tires at the correct level. if you look at some pictures of a lexus making a full U turn...you kinda see the tires riding on the side wall...

 

Soft compound tires + cool weather + sharp turns = tire scrub. It is totally normal, since the cooler weather hardens the soft compound sports tires, making them "skip" across the concrete instead of gripping making that sound. My Z will do it bad in the morning even here in SoCal, if the temp is around 50deg.

 

Yup noticed the same thing when I first got my IS. Made a full U-turn and it felt rusty or my tires were rubbing. Thought it was my AWD ****ed up but nope..

 

What is the best recommended PSI?
The tires say the max psi.

 

What you are feeling is called "tire scrub" as others mentioned. At those steering angles, the tires both roll and slide (AKA scrub) across the pavement. Completely normal - it's due to the steering geometry, and the 2IS did this as well.

Refer to the sticker on the drivers' side door jamb for the correct tire pressures.

 

Do not whatsoever over inflate the tires!!!!! Go by the factory suggested setting only. Any less and you're going to loose mpg. Any more and your tires can overinflated and bust. What I mean by that is you put air in your tires and because it's so volatile it'll deflate and inflate with the change of outside ambient temps (winter vs summer) the danger is if you overinflated (eg, 35/36 psi or more) and once on the highway or driving anywhere for 20-30 mins or more, the heat builds up in the tire and the air pressure rises. Hit a pothole or a curb with high pressure and boom! Don't believe me? Next time check ur psi in the TFT gauge when you start ur car. Drive for while on the hw and monitor the psi, mine has gone up as high as 36 or 37 ( with the initial factory setting at 33/34)

 

FYI - 36 psi cold temperature is the recommended tire pressure from the owner's manual.

 

thanks for the clear up. so yes 36 psi is standard. i could understand how you could fill more air, 36 psi, to compensate for the 18/225 bigger size tires. but i saw they also recommended 36 psi for their 16 and 17 inch tires.. thats overkill, and that also says to me that they got lazy and just through a standard number across all tire sizes. but my point still stands, the higher pressure you put in initially, the more it'll build up when traveling high speed/long distance.

 

36psi, says it in the drivers door jamb