three29

So last friday I went out and by the time I decided to hit the road home it was around 1am. I drove down the street and my tire pressures came on telling me that the car pressure in my tires were low. I got out of the car and checked all the wheels, but they seemed fine to me, so I assumed that it was because it was so damn cold so (the temperature outside was around -25*C that night) so i got back in the car and drove slower than usual, and about 5km later the sensors went off.

When i got back home, I checked the tires again, and they look ok. So my question is, if lower temperatures result in lower tire pressures, are our sensors really THAT sensitive that -25*C will make that much of a difference?

Anyone have similar experiences yet?

fatyin

i think the pressure sensor is fine...

but just being nerdy 8| here

recall from chemistry, constant = PV/(nRT), T in Kevins

when comparing with -25C (248K) and 10C(283K), the pressure diff. is -12.4%
with -25C and +25C, difference = -16.8%

Enjoy!

soccerfinatic

ive had similar experiences! the first time it happened i checked the tires as well but they seemed fine... i put some air in them anyways and it went away. then it came on again but the tires dont look low at all! so personally i think the sensor are a little too sensitive!

three29

+1

hahahah ideal gas law FTW

Blacksheepdj

iTrader: (88)

Yes, they are too sensitive. When I was first studying up on the car, I read that they only warn you if the tire is nearly flat. Then I actually bought the car. After the first chilly day of the year, I learned that they go off when the tires get into the high twenties.

Yes, colder air temps can lead to a drop in tire PSI. Keep those puppies topped off. Use Nitrogen if you can because it's more stable.

CMcraz23

iTrader: (1)

Yeah, Ive had the same experience, it just depends how cold it is.

Nosman

i have nitrogen in my tires and i have no problems at all

steny22

Yea i also had the same problem... when you put air in your tires there is a water vapor also... when it gets cold this water vapor freezes and your tire pressure gets lower


nitrogen fixes this with reducing the amout of water vapor... nosman.. just wondering you have to change anything on your tire to get nitrogen and how much did it cost

Nosman

You dont have to change anything , remove the air and fill it back up with nitrogen . Usaly it is 15-20$ for all 4 tires however it did'n cost me a penny . Oh yea i fogot to mention TPMS live longer with nitrogen because there's let humidity .