Quote:
Originally Posted by ard
Agree it isnt a weight thing
The pressure change stuff is false. All gasses follow the same laws. Nitrogen and oxygen will act the same/
It is because you cannot buy high pressure bottles of *air*; that nitrogen is nice and cheap and inert; that you can buy it 'technical pure' and totally moisture free.
This last part is THE key: moisture. THAT is what caused the pressure changes w temp.
Yes, moisture is the reason for fluctuation. It is difficult to assure you are getting the same amount of moisture each time air is used. Tire pressure is part of the handling setup. As an example, they will determine how much inflation they will start with, run some laps, see how it handles and bring it back in to make adjustments to improve handling. To best reach their goal some use nitrogen so the fluctuations due to heat are consistent as they may change the pressure in one or more tires to improve handling. That and a bunch more information will be saved for future reference. With nitrogen in tires the setup is easier to duplicate.
And the nitrogen they sell in shops is NOT the same that race cars and airplanes use.
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Just for grins, I tried nitrogen one time on my X. I couldn't tell any difference. Even if there had been a difference. It wasn't very long before I had to adjust the air pressure. It was not convenient because I didn't have a nitrogen tank. So the first time I adjusted the air in the tires it was with air.