Good time to check tire pressure

[deathsled]

Checked my tire pressure on big red and all four were down a bit.  Pumped them up after the oil change and all is good.  Word to the wise to check and maintain tire pressures.

Richard E.

[shelbydoug]

Yes. Tire pressure for me seems to disproportionately decrease with big cold temperature drops. There is an engineering chart around that shows something like a 1 psi drop for every 10 degree drop BUT personally I've seen tire pressures regularly drop to about 15 psi from about 32 when the temps suddenly drop from the 40's to the low teens.

Probably has more to do with the ability of the valve stem to hold pressure under those conditions rather then the compression of the air in the tires.

Just my observations. Scientists may disagree.

[Bigfoot]

"Changing gears...."
Its always a struggle to figure out exactly the pressure you need on the track.
And of course as you push the car and the temps go up so does the psi.

[deathsled]

I've never been out on the track as a driver.  But totally logical as air molecules heat they expand therefore change the reads.  I understand that nitrogen filled tires work better because nitrogen is less susceptible to expansion.   

[shelbydoug]

I've never been out on the track as a driver.  But totally logical as air molecules heat they expand therefore change the reads.  I understand that nitrogen filled tires work better because nitrogen is less susceptible to expansion.

Yes.

I like helium better. When I go too fast it makes the scream a higher pitch.

[Alan]

Helium held its pressure for me but traction got real sketchy.

[shelbydoug]

You need to breath the helium.