gmueip

iTrader: (8)

Yesterday the temp here in VA dipped to 25 degrees and when I started my car the low PSI warning went off. All four tires fell to 29 PSI and eventually rised to 32 PSI after reaching operating temp. Before the termperature dip the tires had a PSI of 36 at operating temp. Anyone else experince this?

striker27

iTrader: (6)

Yes it happens everywhere it gets cold!!!!

gmueip

iTrader: (8)

I've never had TMPS sensors on my tires so just asking

DavesZ#3

iTrader: (26)

One way that you can avoid the temperature effect on your tire pressure is to make the switch to Nitrogen. Because it is "dry", it doesn't suffer the wide range of expansion and contraction from a large temperature delta that regular, humid air does.

quakerroatmeal

iTrader: (9)

On mines I just air it up a few psi over around 38, when it's cold it'll run around 35.

gmueip

iTrader: (8)

Thank you all for the info!

davidv

iTrader: (2)

Yes. Jacques Charles discovered this about 1787.

The formula for the law is:

v/t=k

where:
V is the volume of the gas
T is the temperature of the gas (measured in Kelvin)
k is a constant.

Tac-M

iTrader: (17)

^ ahahah !!! hahaha !!!

DAVE YOU DA MAN !!! this forum would not be the same without you !

DavesZ#3

iTrader: (26)

Actually, the PV=nRT equation is the one that comes into play here. P = (nR/V)T tells you that pressure varies directly with temperature assuming that the volume (V) and number of molecules of the gas (n) are the same.

V/T=k make the assumption that pressure is constant which is obviously not the case as the OP observed.

killa.beez33

iTrader: (6)

yup snowin in washington and happend to me. i freaked out cause i didn't know that light was, but i saw psi blinkin and that calmed me down haha

Spike100

As Dave mentions, you can mitigate psi variations by filling with nitrogen. The benefit nitrogen provides is arguable, but I notice a difference. I’m in a much colder climate than you. Winter temperatures fluctuate greatly in Minnesota, going from freezing to -25 Fahrenheit.

I’ve also notice that it is easier to maintain psi within the correct range when running 17” wheels vs. lower profile tires on 18” wheels. Again, I’m in a very cold climate.

My tire guy makes another point about nitrogen. He says that nitrogen maintains a drier environment inside the tire that prevents condensation on the inside part of the wheel. I have no idea if that is true, but if so, that is certainly another reason to fill with nitrogen.

--Spike

TreeFiddyZee

iTrader: (19)

I think Seinfeld had an episode about it. Something about "shrinkage".

djnc

iTrader: (8)

someone didn't take chemistry

terrasmak

iTrader: (8)

You should probably learn this in 11th or 12th grade. Are you a 16 year old sophomore, and you parents bought you a Z?

Chebosto

iTrader: (43)

hahaha.. classic.

i take it the OP failed Chemistry?

itsjiggajames

iTrader: (5)

Yes, this is the correct formula.+1

Z04

iTrader: (15)

actually, he failed to use the search and read the numerous other threads that cover the same subject

gmueip

iTrader: (8)

I started a thread in my350Z.com without doing a search. I will take full responsibility for the ensuing flaming

I figured it was due to the low ambient temperature but since it didn't happen to me last winter, I decided to seek advice on the forum.

And to make the forum correctness ***** happy: what's the best C.A.I for the Z?

DavesZ#3

iTrader: (26)

Oh, that's easy. The one that lets the most air through without allowing it to heat up much while having a filter that doesn't clog easily or be in a position to allow the ingestion of water. It also helps if it looks good.