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      10-24-2009, 09:41 AM   #1
Mr.AK
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Nitrogen tires

My service advisor recommended refilling my tires with Nitrogen air. $118. Probably bullshit but whatever. Tell me what you think.
http://www.n2now.com/
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      10-24-2009, 10:15 AM   #2
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Quote:
Originally Posted by Mr.AK View Post
My service advisor recommended refilling my tires with Nitrogen air. $118. Probably bullshit but whatever. Tell me what you think.
http://www.n2now.com/
$118


I got it for $5 a tire.
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      10-24-2009, 10:53 AM   #3
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I got it for free. Its good when the weather changes temp, the tire pressure doesn't change as much.
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      10-24-2009, 11:09 AM   #4
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they put these green labeled caps on all 4 tires and lost my old ones. I was VERY upset because i bet im gonna need to pay for originals one day once this nitrogen gig is over!
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      10-24-2009, 11:38 AM   #5
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Do all dealers have nitrogen?
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      10-24-2009, 12:01 PM   #6
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For a truck driver driving from coast to coast it makes sense; otherwise it's overkill. Besides, tires still lose pressure over time (more if not used frequently), and need to be aired regularly, especially when weather turns cold. I probably spend 10 minutes a year keeping my tire pressure constant. Not worth the trouble IMO.
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      10-24-2009, 04:22 PM   #7
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Quote:
Originally Posted by Mr.AK View Post
My service advisor recommended refilling my tires with Nitrogen air. $118. Probably bullshit but whatever. Tell me what you think.
http://www.n2now.com/
Yeah, you're right, it's bullshite...
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      10-24-2009, 05:00 PM   #8
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I know I'm going to regret posting this, but what the hell...

I use 99% High-purity Nitrogen gas in my tires.

Now you have to stick with it for a long time period to see any of the real benefits. That's the key. You cannot 'mix' it with regular compressed air, or you might as well forget about doing it at all.

Normal compressed air has ~78% nitrogen content. You wouldn't think that extra 21% of nitrogen would make a difference...but it does.

Here is what I have observed over the years, since I switched over to using nitrogen in my tires.

a) My tire pressures are more stable, and they rarely require pressure 'adjustments' to maintain my target air pressures. (38f, 41r) During one stretch, I did not have to add any nitrogen to my tire for a period of 7 months. I was amazed that it actually maintained the tire pressure!

b) My tire tread life has increased, since I started using nitrogen instead of compressed shop air.

Now I know you guys are going to call BS on this...but it's true.

I believe it has something to do with maintaining the shape of the tire and the contact patch. (less scrubbing in the corners) I was told by a tire engineer at Goodyear, that maintaining a stable consistent tire pressure will increase your tire wear. (by a few thousand miles on some tire compounds) He also told me the tire doesn't deform as much when you use nitrogen, because the gas doesn't expand or contract quite as much as normal compressed air does when the tire heats up. Therefore, I suspect it will help the tire maintain it's shape even when it's under heavy cornering loads. (when a typical under-inflated tire would roll over on it's sidewall) Proper consistent inflation pressure will minimize this effect, which leads to better (longer) tire wear.

c) My BLACK rubber tires stay black for the duration of their service life.

Now this one may not matter at all to you guys, but I hate when my black tires start turning dark brown. This is because the moisture that is typically found in compressed air will eventually turn your tires black rubber compound brown over time. I see this as an eyesore and i was happy to find out that nitrogen also keeps this from occurring. The nitrogen gas displaces the 02 in the normal compressed air, which removes the moisture content as well. Your nitrogen air is completely 'dry' from a moisture standpoint, and it does not readily absorb it either.

So that's why I decided to switch to nitrogen fill in my high performance tires.

I know some of you will never believe it makes ANY difference...and that's okay, but for those who have used this alternative for a long period of time...you know what I'm saying is the gospel truth.
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      10-24-2009, 06:03 PM   #9
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Yeah, it is true. However, sometimes its just impractical.
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      10-24-2009, 06:48 PM   #10
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Exclamation

Quote:
Originally Posted by shchow View Post
Yeah, you're right, it's bullshite...
+1
the atmosphere is 79% nitrogen, 20% oxygen, and 1% other ...yeah BS!!!

O2 is corrosive...yeah, if you are running steel wheels!
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      10-25-2009, 09:06 AM   #11
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Oxygen can cause oxidation in rubber but I fail to see how keeping oxygen out of the inside of a tire will prevent oxidation to the outside of a tire.

CA
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      10-25-2009, 04:54 PM   #12
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Quote:
Originally Posted by Lemans_Blue_M View Post
I know I'm going to regret posting this, but what the hell...

I use 99% High-purity Nitrogen gas in my tires.

Now you have to stick with it for a long time period to see any of the real benefits. That's the key. You cannot 'mix' it with regular compressed air, or you might as well forget about doing it at all.

Normal compressed air has ~78% nitrogen content. You wouldn't think that extra 21% of nitrogen would make a difference...but it does.

Here is what I have observed over the years, since I switched over to using nitrogen in my tires.

a) My tire pressures are more stable, and they rarely require pressure 'adjustments' to maintain my target air pressures. (38f, 41r) During one stretch, I did not have to add any nitrogen to my tire for a period of 7 months. I was amazed that it actually maintained the tire pressure!

b) My tire tread life has increased, since I started using nitrogen instead of compressed shop air.

Now I know you guys are going to call BS on this...but it's true.

I believe it has something to do with maintaining the shape of the tire and the contact patch. (less scrubbing in the corners) I was told by a tire engineer at Goodyear, that maintaining a stable consistent tire pressure will increase your tire wear. (by a few thousand miles on some tire compounds) He also told me the tire doesn't deform as much when you use nitrogen, because the gas doesn't expand or contract quite as much as normal compressed air does when the tire heats up. Therefore, I suspect it will help the tire maintain it's shape even when it's under heavy cornering loads. (when a typical under-inflated tire would roll over on it's sidewall) Proper consistent inflation pressure will minimize this effect, which leads to better (longer) tire wear.

c) My BLACK rubber tires stay black for the duration of their service life.

Now this one may not matter at all to you guys, but I hate when my black tires start turning dark brown. This is because the moisture that is typically found in compressed air will eventually turn your tires black rubber compound brown over time. I see this as an eyesore and i was happy to find out that nitrogen also keeps this from occurring. The nitrogen gas displaces the 02 in the normal compressed air, which removes the moisture content as well. Your nitrogen air is completely 'dry' from a moisture standpoint, and it does not readily absorb it either.

So that's why I decided to switch to nitrogen fill in my high performance tires.

I know some of you will never believe it makes ANY difference...and that's okay, but for those who have used this alternative for a long period of time...you know what I'm saying is the gospel truth.
I believe this 100%, it's just I haven't gotten myself to take my car to a tire shop and actually fill it up with nitrogen air
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      10-25-2009, 05:22 PM   #13
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When I took delivery of my M3, I believe it already had its tires filled up with Nitrogen, since it has the 'lime-green inflation caps'......Am I correct, or do all M3's have that??
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      10-25-2009, 05:33 PM   #14
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Mine were that grey looking TPMS cap. Looks very nice
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      10-25-2009, 06:45 PM   #15
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Running nitrogen is great, but it is not $118 better than air. Not even close. $5 per tire is as much as I'd pay.
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      10-25-2009, 07:03 PM   #16
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Yes, I think that point has been missed by many of the nitrogen proponents here, of which I am one. $118 (if a true quote by a dealer) just to fill 4 tires with N is absurd. $5 extra per tire is about right by any stretch of the imagination. It's provided free by many installers.

I suspect many of the BS comments were directed toward that price, and with that I would have to agree. I'm wondering if that was a quote for his total mounting and balancing charges, including N inflation. The OP was vague about that.
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      10-25-2009, 07:24 PM   #17
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Quote:
Originally Posted by captainaudio View Post
Oxygen can cause oxidation in rubber but I fail to see how keeping oxygen out of the inside of a tire will prevent oxidation to the outside of a tire.

CA
+1 can't keep oxygen off the outside of the tire

It's a bunch of BS... Yes your tire will maintain same pressure better... but driving on the street your pressure doesn't change that much and as the weather changes you can easily check your tire pressure and adjust it for free with regular air.
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      10-25-2009, 07:38 PM   #18
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Quote:
Originally Posted by smokinjoe64 View Post
+1
the atmosphere is 79% nitrogen, 20% oxygen, and 1% other ...yeah BS!!!

O2 is corrosive...yeah, if you are running steel wheels!
Aluminum corrodes, steel rusts...

The extra ~20% of nitrogen, displaces the oxygen content inside the tires. That all but eliminates moisture...which leads to corrosion. Without oxygen, corrosion (or rust) can not occur.


Quote:
Originally Posted by captainaudio View Post
Oxygen can cause oxidation in rubber but I fail to see how keeping oxygen out of the inside of a tire will prevent oxidation to the outside of a tire.

CA
Rubber is actually a porous material. The average consumer doesn't know that...

This is a small but important point.

Over time, the normal compressed air used to inflate the tire will permeate (leak) THROUGH the outer rubber jacket, back to atmosphere. (not kidding)

As this occurs, the 20% oxygen content in the normal compressed air will slowly degrade the rubber compound as it passes through, turning it a dark shade of brown. (again not kidding)

I worked for Boeing many years ago, and we always filled the landing gear tires with nitrogen gas, because it was simply better than compressed shop air. The tires lasted longer, and they performed in a predictable manner, regardless of the extreme temperature swings they were subjected to on the flight line.

I can tell you with absolute certainty that nitrogen does work to improve (and maximize) the performance of your tires. If you simply refuse to believe that...then I guess there is nothing more I could say to change your minds...
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      10-25-2009, 08:29 PM   #19
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^-- there's a much bigger temperature swing in airline tires and regular air contains water vapor. Which can turn to steam or ice depending on conditions.


On a side note... I've never owned tires long enough (especially on a high performance car) to even consider worrying about rubber slowly breaking down from oxidation. They are long out of tread before that's an issue
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      10-25-2009, 09:38 PM   #20
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Quote:
Originally Posted by Lemans_Blue_M View Post

You cannot 'mix' it with regular compressed air, or you might as well forget about doing it at all.

Normal compressed air has ~78% nitrogen content. You wouldn't think that extra 21% of nitrogen would make a difference...but it does.

After the nitrogen fill the tire air will still be mixed with oxygen. They do not remove the oxygen (at atmospheric pressure) that is left when letting out the pressure for the nitrogen fill. You do not have pure nitrogen when the tire is refilled.

This is a link to information from Bridgestone regarding nitrogen in tires:
http://www.getnitrogen.org/pdf/Bridgestone.pdf

You will notice that there is a greater advantage if filling the tires to higher pressures, like their example at 105 psi. Automotive tires lower concentration of nitrogen because of the lower pressure used.

For the OP:
They're asking way too much for the nitrogen fill.

Last edited by kenwelch; 10-25-2009 at 09:59 PM. Reason: add link to information from Bridgestone
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      10-25-2009, 10:00 PM   #21
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Quote:
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After the nitrogen fill the tire air will still be mixed with oxygen. They do not remove the oxygen (at atmospheric pressure) that is left when letting out the pressure for the nitrogen fill. You do not have pure nitrogen when the tire is refilled.

For the OP:
They're asking way too much for the nitrogen fill.
The proper nitrogen fill procedure is to inflate...then evacuate the air 3 times to PURGE the oxygen from the tire cavity.
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      10-25-2009, 10:06 PM   #22
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Nissan puts N in the GTR tires from the factory.
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