mrcpu

Hi All,

I was at oil can henry's in Grants Pass, OR the other day getting my oil changed, and as part of the "service", they were going to check the tire pressure. I later asked them what the tires were at, and they told me 44 lbs. I said 44 lbs? That seems high, I think the sticker says they shoudl be 32. He told me that they had to be pumped up higher because they were nitrogen filled...

Sounds bogus to me, but I've never heard of putting nitrogen in a tire anyway (other than the normal what, 75% of the atmosphere that already is nitrogen?), but their reasoning seemed pretty bogus to me.

Anyway, I call "probable BS", but just wanted to confirm.

psi is psi...

3.2TLc

Nitrogen .... air pressure ??? Did ya even realize that ya had nitrogen ?
IDK, but it should'nt make that big of a difference, IMO !!!
Your tire's air pressure will read higher if checked when running hot. Normally, I like to run my tires over Acura's recommended settings for better wear and handling. Ya may sacrifice a bit on the ride quality softness, but at over 10 years and 100k....what the hey ??? Probable BS is always likely and to be expected from the "Quickie" shops.

HairyMonkey019

iTrader: (7)

I would assume it has to be at the PSI you want to run it at, which is probably what the tire calls for. Nitrogen filled tires just means you don't have to check tire pressure every month because nitrogen isn't affected by outside temperatures as much as normal air.

Dman00tl

I use nitrogen and my tires are all at 32. I like it better because the tire pressure doesn't fluctuate that much in the winter, IMO.

HairyMonkey019

iTrader: (7)

mrcpu

My question is not about putting nitrogen in the tire, given that normal air is something like 75% nitrogen, going to 100% can't be that big a deal.

My question was more, does running nitrogen somehow require the tire to be pumped up to a much higher PSI than what the sidewall indicates in order to be "equivalent" to normal air?

Common sense tells me no, but these guys were pretty insistent that 32lb of normal air required 44lbs of nitrogen for the same effect. Sounds like horsepuckey to me.

HairyMonkey019

iTrader: (7)

Then yes, you are right. 10lbs of meat is still equal to 10lbs of brick, in terms of weight they are still equal.

justnspace

iTrader: (1)

you're right. the atmosphere is made up of about 75% nitrogen.
they over inflated your tires

bonknhead

You might need a little more pressure during winter months, but unless the temps were 120* lower than when the tires were filled, you wouldn't need additional nitrogen.

Long read: http://www.tirerack.com/tires/tirete...jsp?techid=191

"Nitrogen is a gas and is still affected by changes in ambient temperature (about one psi for every 10° Fahrenheit). Nitrogen filled tires will require pressure be added during the fall/winter months as ambient temperatures and tire pressures drop. Nitrogen is good but can't change the laws of physics."