If tire mfgs want 32 pressure when cold because pressure increases when tires are hot should a nitrogen fill start higher since they don't heat as much?
Gerry

I wouldn't recommend it, I also wouldn't waste your time with nitorgen in the tires either but that's just me. For an air fill, I'd start with 30 cold not 32.

Paul

Dealer did it for "free" Get free fills for life. 32 was just an example

Just had mine refilled today; dealer put in a few extra pounds(35) and said for me to let out as much as I wanted (31 instead of 30) after I got home. But the point is you should put in what the tires or vehicle normally calls for.
And I definitely think its better than O2!

Isn't "air" 72% nitrogen anyway?

Why would ANYONE fill their tires with oxygen?

Dunno, one spark and Kaboom. Several Apollo flights had that problem.

Nitrogen filled tires is pretty common with the NASCAR racers.

How do they purge out all the old air to fill with Nitrogen??

Since the other components of air are heavier you just need to have your valve stem toward the ground and let out 22 percent of the air in the tire. Then you refill with pure nitrogen.

Make sure that you car is absolutley level before starting this procedure!

Water vapor is the pressure enducing factor IRT heat. Dry air (low humidity) is almost as effective as the minimal effects that nitrogen produces. Racers use nitrogen since it is easily available in tanks (no compressor safety factors) and it is dry (no water vapor). Straight compressed air is not available commercially and nitrogen would not cost much more than air anyway.

In theory, Nitrogen doesn't attract water molecules so tire pressures are far more stable and would require an adjustment-how much depends on your cold-hot difference. With a perfect wheel/tire/valve stem, Nitrogen-filled tires will stay inflated about three times as long as air-filled tires. The fact is, there is so much contradicatory information about this fad that really makes the whole thing suspect, and in any case, there does not appear to be much pay back in mileage or reduced maintenance. Bottom line, if it is for free, go for it, it can't hurt anything. If you have to pay for it, I would pass because the actual real world benefits will not give you pay back.

Checking and maintaining your tire pressures will likely do more for you than the Nitrogen Fad. With the Vette, just check your DIC for your current tire pressures.

If your driving a NASCAR cup car in the most grueling race possible, nitrogen might make a miniscule difference in the amount the pressure builds up. But they are dealing in fractions of a pound making big handling differences in race cars. Their race tire might go from 25 cold to 39 hot, with just nitrogen maybe it will only go to 37.

On a street car it don't mean sheet, it's marketing hype from places like Belle tire or Discount tire.

Throw about 30 psi of plain old air in and drive the sumbitch.

Did you shower this morning in distilled water or tap? Same difference.

Here we go again.........

A) Nitrogen has one property that makes it especially useful in several applications. This property is that it is dry. Not having water vapor means that as your tires heat up the tire pressure rise is less with nitrogen than with (wet) air. How much less, lets say a tire filled with (wet) air has a pressure rise of 6 PSI from cold to comming of the road race track hot; nitrogen will only see an increase of 4.5-5 PSI. WHile it is less, it is not so much as to be noticed in anything other than race track temperature rises.

B) Applications where nitrogen is beneficial:: 1) Truck tires that last 100,000 miles, 2) SUV tires that last 80,000 miles, 3) road race car tires, 4) airplane tires. Notice that passenger tires are not on this list.

Go visit; http://forums.corvetteforum.com/show...erfect+gas+law and read post # 36.

The most benefit gained by using Nitrogen is because it is DRY and it is CLEAN. Moisture and dirt or contaminants inside the tire cause degradation of the rubber and corrosion of the metal of the tire rim. This will probably not be noticed if you trade cars frequently but if you keep the car for a long time it can, over time, become a problem affecting the way the bead of the tire seals against the rim of the wheel.

Dealer put nitrogen in my tires at last oil change 6 weeks ago.Before had to top off pressure in tires every 2-3 weeks.Now steady at 30 for 6 plus weeks.That is an advantage in my book.

I like the valve stems down method but seriously, in order to reduce the residual air (and moisture) you (or your dealer) would need to purge the tires. What you're really trying to reduce is moisture vapor. A fill with dry nitrogen and very humid residual air would be no better than a fill with fairly dry air.

Here's an example:

(1) Let "all the air" out of the tire. You now have 1 volume of air at 15 PSI absolute.
(2) Fill with dry nitrogen to 45 PSI. You now have 1 volume of air and 3 volumes of dry nitrogen at 60 PSI absolute, or a 3:1 ratio.
(3) Again let "all the air" out of the tire. You now have one 1/4 volume of air and 3/4 volume of dry nitrogen at 15 PSI absolute.
(4) Again fill with dry nitrogen to 45 PSI . You now have 1/4 volume of air and 3 volumes of dry nitrogen at 60 PSI absolute, or a 9:1 ratio.
... Repeat as needed until you have as little residual air as required.

So tell them you want 100% dry nitrogen and see how they manage that! Or just drive the car to Arizona to get the tires filled. Oh wait - I see a market here - genuine Arizona air, filtered, compressed and shipped to your door. All the advantages of dry nitrogen, but entirely natural and with no artifical ingredients! A real bargain at only $15.00 per tire.

If you fill the tires with helium, it'll make the car about 200 lbs lighter so 0-60 and 1/4 mile times should also decrease.

Don't go by what the tire manufacturer says. Go by what the label on the door jam says. For Vettes, unless it has changed for the 07, is 30# cold for each tire. Unless you have moisture in the tire, the pressure increase for both air and nitrogen is the same according to the Combined Gas Law.

The combined gas law is a gas law which combines Charles's law, Boyle's law, and Gay-Lussac's law. In each of these laws, pressure, temperature, and volume, respectively, must remain constant for the law to be true. In the combined gas law, any of these properties can be found mathematically.

The law states that the product of the volume of a gas and its pressure over the temperature is equal to a constant. Expressed mathematically, the formula is:

pV/T = k

-where:

p is the pressure.
V is the volume.
T is the temperature (measured in kelvin in SI units).
k is a constant.

It doesn't matter what the gas is. They all act the same

What a concept! I'll get right on that...."Airzona LLC" direct to you....$15 per tire plus shipping and handling Well wait, with all the rain we've had this past week and the high humidity, give me a month or two on that one

?Unless you want immediate results, wouldn't the air seep-out over time leaving just the 'pure' nitrogen thus eliminating the need for repeated purging?

No matter....I've got Airzona brand air in my runflats

If you fill your tires with nitrogen, make sure and rotate the nitrogen every 5,000 miles. Otherwise it will turn to BS.