Tire air pressure, would like other opinions.

[ZL12013]

I know the tires are suppose to be at 32 psi cold but when I take the car out on a cold day the tires are usually around 29-30 psi. After driving a very short distance, 6-10 blocks they immediately climb to 32 psi, eventually as high as 33-34 psi as they warm up.

My question is if I inflate the tires to 32 psi at their coldest point after sitting for several days, once I start driving are they actually over inflated.

For example yesterday and today the temperature stayed in the 50's overnight and when I started the car this morning the tires were showing 32 psi cold, if I added air last week they would had been at 34-35 psi. I was just curious what other people thoughts about this was.

[ZL1-V]

Originally Posted by ZL12013

I know the tires are suppose to be at 32 psi cold but when I take the car out on a cold day the tires are usually around 29-30 psi. After driving a very short distance, 6-10 blocks they immediately climb to 32 psi, eventually as high as 33-34 psi as they warm up.

My question is if I inflate the tires to 32 psi at their coldest point after sitting for several days, once I start driving are they actually over inflated.

For example yesterday and today the temperature stayed in the 50's overnight and when I started the car this morning the tires were showing 32 psi cold, if I added air last week they would had been at 34-35 psi. I was just curious what other people thoughts about this was.

Not really a big deal for me as I run 34 cold. "Who stated they were overinflated"? Tire pressures will vary, did you watch the video regarding the ZL1 and tire pressures during track useage? Are you feeling a difference while driving with more tire pressure?

[69NMYSS]

I am 28-29psi cold at track. After one session, im close to 40psi. There gonna fluctuate with cold/heat....no biggie.

[ex-SS-ve]

I find that 36 psi on mine is just perfect.

[SlingShot]

I run at 34 cold, I like the feel better and don't get all that scruffing noise when I back out of the drive.

[AKA-51]

i was told to run @ 36 psi cold

[sammyv]

32 cold would be ideal for me for street use. On a road course 38-40 max for steet tires.

[sammyv]

Just looked at my rear tire it say 51 psi max.

[The Stig]

Originally Posted by AKA-51

i was told to run @ 36 psi cold

The SS 20" wheels (P Zero tires) are recommended to run 36 PSI when cold.

The ZL1 and 1LE tires (Goodyears) are recommended at 32 PSI when cold.

[Skylane765]

Originally Posted by ZL12013

I know the tires are suppose to be at 32 psi cold but when I take the car out on a cold day the tires are usually around 29-30 psi. After driving a very short distance, 6-10 blocks they immediately climb to 32 psi, eventually as high as 33-34 psi as they warm up.

My question is if I inflate the tires to 32 psi at their coldest point after sitting for several days, once I start driving are they actually over inflated.

For example yesterday and today the temperature stayed in the 50's overnight and when I started the car this morning the tires were showing 32 psi cold, if I added air last week they would had been at 34-35 psi. I was just curious what other people thoughts about this was.

Better gas mileage and they will last longer over inflated

[Les7311]

Adding to this thread........

I will get a "thump" "thump" roll noise in tire when i drive, after sitting for at least 2 weeks......

Is this normal? Any remedy? Car is now in winter mode until March.....

..eventually the noise goes within a mile or so.....

[Mr. iNCREDIBLE]

I run 34lbs PSI cold. Cold being 50° outside, with the cement driveway at 41° (checked it with my laser thermometer)..

@ 34lbs PSI the tires will get to 38lbs PSI at highway speeds.. @ 38 lbs PSI I am getting what I consider to be the best performance from the tires, both in terms of grip and MPG.

[MYDLIFECRISIS]

Originally Posted by Les7311

Adding to this thread........

I will get a "thump" "thump" roll noise in tire when i drive, after sitting for at least 2 weeks......

Is this normal? Any remedy? Car is now in winter mode until March.....

..eventually the noise goes within a mile or so.....

Yes...P Zeros tend to get a flat spot when sitting for a while and cold. It does go away after driving a bit and the tire warms up some. Not sure of a remedy, I chose not to store it.

[Les7311]

Thanks MYDLIFE......