PurigeN98 in our Tires
08-01-07, 06:46 PM
#16
Lexus Test Driver
I'm in NorCal (Bay Area). The thing about having Big O fill it up with nitrogen is you will always go back to them for fillups since it's free. It's a marketing tactic to get you in to their store more often and hopefully spend $$. It is pointless to drive far if there is no Big O close to you. But I'm sure there are other shops close to you that provides it.
I went ahead and bought a compressor so I can check/fill first thing in the morning when the tires are cold.
08-01-07, 09:07 PM
#17
Tech Info Resource
iTrader: (2)
Exactly. Whole air is already 78% nitrogen, and it's not the nitrogen that makes the big difference, it's the fact the nitrogen is dry. Compressed air has water in it, and the water expands way more than the 19% oxygen could ever think about at operating temperature.
Rule of thumb racing bikes - set tire pressure for a 3 - 4 psi increase after a track session with whole air, and 1 psi with nitrogen. If your air source is unusually humid, you will have problems getting the pressures right. DRY is the key here, not N2.
Rule of thumb racing bikes - set tire pressure for a 3 - 4 psi increase after a track session with whole air, and 1 psi with nitrogen. If your air source is unusually humid, you will have problems getting the pressures right. DRY is the key here, not N2.
08-02-07, 08:03 AM
#18
You're supposed to check tire pressures before you drive the car, so driving it somewhere to get the pressure checked is inaccurate at best. The exception is if you're checking the air pressure before you leave and having them add the correct amount of air per tire after you drive it to Big O. As you can imagine, most shops will look at you like you have two heads if you tell them your fronts had 30 and 28 pounds when you left, and the rears had 33 and 31, so you want them to put 5 psi in this tire, 4 psi in that tire, etc...
I went ahead and bought a compressor so I can check/fill first thing in the morning when the tires are cold.
I went ahead and bought a compressor so I can check/fill first thing in the morning when the tires are cold.
08-02-07, 09:56 AM
#19
Exactly. Whole air is already 78% nitrogen, and it's not the nitrogen that makes the big difference, it's the fact the nitrogen is dry. Compressed air has water in it, and the water expands way more than the 19% oxygen could ever think about at operating temperature.
Rule of thumb racing bikes - set tire pressure for a 3 - 4 psi increase after a track session with whole air, and 1 psi with nitrogen. If your air source is unusually humid, you will have problems getting the pressures right. DRY is the key here, not N2.
Rule of thumb racing bikes - set tire pressure for a 3 - 4 psi increase after a track session with whole air, and 1 psi with nitrogen. If your air source is unusually humid, you will have problems getting the pressures right. DRY is the key here, not N2.
08-02-07, 03:45 PM
#20
Tech Info Resource
iTrader: (2)
It would be cheaper to refrigerate the air so the water condenses out. Adsorbents for water die pretty quickly. We had them on my old airplane for the pneumatically operated devices on the aircraft's exterior.
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