done and done..









also had the take-offs re-balanced...


i love those jack stands/billows....


ese

ps- x54's installed today..... nice touch..........

 

So have you noticed a difference? I saw their add in Tampa Bay Mag

 

^^ sure have^^

the ride quality-feel is improved, and (with a rebalance, mind you) comfortable.... (the ps2's are even smoother now it seems)

i havent checked pressure in them since the install, but plan to shortly...

monies well spent, IMO

 

Not sure why you'd want nitrogen in street tires? From what I remember, it's primarily used in racing to minimize changes in tire pressure due to temperature.

 

those little jacks are pimp, where can I get some?



How close is the next nitrogen filling station to you? You have a costco close?

 

I saw a big sign in Costco's tire department that said...
"Nitrogen Air" for your tires...
So what does it do exactly? I just had new PS2's put on my 997. Wow, what a great feel. I have always been guilty of not checking tire pressure, but now I am much more aware. I would do the Nitrogen in these new PS2's if I can understand the benefit. ..Its like trying gas with a really high octane to see what the car does, or can do !!! ;-)

 

When the weather changes, you'll have less fluctuation in tire pressure so it'll be less work for you to "maintain" correct pressures.

Also, it'll be easier for you to set the "perfect" tire pressure becuz you won't have to set it cold and then readjust later when hot.

- KJ

 

Mobile tire service with a Hunter 9700, boy could I use that right now. That is awesome.

 

No matter what the gas is ti still falls under the rule PV=nRT. The tires will expand the exact same as they heat up. The advantage uof nitrogen is that it will defuse slower due to larger molecules than Air. Air also has water in it. Remember air is 70% hydrogen.

 

"Remember air is 70% hydrogen"

So you know what the ideal gas equation is but you haven't a clue as to the composition of air? maybe its just supposed to be funny Just in case its about 21% oxygen and 78% nitrogen by volume.

Seems for the most part N2 isn't really any better then "dry" air. Water content in air makes pressure changes as a result of changes in temperature moderately unpredictable. Especially important in racing but for street driving prob not an issue.

As to ride quality with and without thats typically funny.

 

to help control condensation.

 

Nitrogen will not expand at the rate oxygen does. The water is the key component. Nitrogen won't support water so as a result there is no water in nitrogen to expand. With it's larger molecular structure as well it's more stable. Under normal conditions oxygen expands 1 lb. per 10 degrees of temp. increase or vise versa, so it's more difficult to control on a track. Nitrogen is easier to control under those conditions.

As a sidenote, Firestone just installed a huge super dryer at the Indy track here in Indiana that removes so much water from oxygen that the end result is comparable to the properties of nitrogen - and that's the air system the Indy cars use.

It's becoming more popular all the time and does have it's redeaming qualities. I think it's a great idea to use everywhere given that so many accidents a year could be prevented if people would stop riding around on near flat tires because they never check them.

Some wheels are even coming with two valve stems to be able to purge a system of air. Our Kosei K1-TS for example:

 

If you use Helium your car will fly

 

I'd expect better from the tirerack. Its not that the statements are wrong but give the wrong understanding and leave impression that there are significant differences when they are actually exceedingly small. Granted I shouldn't care but I just couldn't leave it alone. So....

"Nitrogen will not expand at the rate oxygen does"

For the conditions experienced in a tire say 30 psig from 70F to 250F the differences between pressure and temperature for N2 and O2 are exceedingly small (about 0.001 psi).

"Under normal conditions oxygen expands 1 lb. per 10 degrees of temp........so it's more difficult to control on a track"
The rate is approximately correct, actually it’s like .85psi per 10 deg F. But to be clear O2, N2 and dry air all expand at that rate (after all air is for the most part made of O2 and N2). The reason they are all the same is because they all behave as ideal gases under the working conditions in a tire. All three gases in this respect are the same they expand at the SAME rate with temperate.

"Nitrogen won't support water"
Humm it seems to when it’s in air. Water vapor and N2 are just two gasses that can mix. You could if you want to mix N2 and water vapor and get wet nitrogen. If you mean that in the process of separating the N2 from air the water vapor portion is eliminated then I agree.

"With it's larger molecular structure as well it's more stable"
I have read some advertising concerning the slower leakage of nitrogen through the carcass of a tire. Funny thing is since air is 70% N2 already then it isn't that bad to start with, is it? As to stability I gather that you mean in comparison to air. Well the outside of the tire is exposed to air regardless and that is most likely the critical area with respect to oxidation since it gets UV also? When was the last time a tire degraded faster on the inside than the outside?

So if there was a bottom line to all this, I'd say it was eliminate the water vapor portion from the air and you are good to go. It may well be easier to separate the N2 from the air and get it dry that way. If you can dry the air and put it in the tire then I'd be willing to believe that you are done and at least you mentioned that in the indycar reference.

Sad thing is Carroll Smith had it right in engineer to win page 200. Go take a peek...

 

esemes and mikeTT:

are you guys in Tampa too?