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      10-02-2011, 11:34 AM   #1
cukoodukoo
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sudden drop in Tire presssure

I kept my car yesterday night outdoors[temp 50's] and the tire pressure warning came up today in all four tires.I checked the pressure today and was surprised at the drastic drop.

Front tires are 25 and rears are 31.5.Is this normal?The rec pressure are 32,39 AFAIK.Would i damage the tires if i drive the car to the gas station in the present state?
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      10-02-2011, 11:51 AM   #2
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I would leave it as when it warms up, things should go back to normal. If you fill the tires up, then they will be over inflated. My wifes Porsche does this when it gets cool outside too.
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      10-02-2011, 01:15 PM   #3
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the rule of thumb is that for every 10F drop in temperature, psi will usually drop 1. Recommended tire pressures should be set on cold tires, not warm. If you're worried about it, short driving on the lower tire pressure is fine.
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      10-02-2011, 08:26 PM   #4
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Quote:
Originally Posted by Hamster12011 View Post
I would leave it as when it warms up, things should go back to normal. If you fill the tires up, then they will be over inflated. My wifes Porsche does this when it gets cool outside too.
See what Kamal said:

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Originally Posted by Kamal View Post
Recommended tire pressures should be set on cold tires, not warm. If you're worried about it, short driving on the lower tire pressure is fine.

Most of the tires that you can put on this car are designed to have a maximum pressure of about 50 psi cold. At least that's with my hankooks, I think the stock Bridgestones say 51 psi, but it's basically the same.

Yes, they will heat up and the air will expand, and your pressure will increase, but the tires can take it. I always try to keep mine at about 38 front 40 rear (to combat the squishy sidewalls of my non run flats). I would rather run slightly high than slightly low, the tires won't explode as long as you're below the maximum cold inflation pressure.

Also, as Kamal said, remember that for every 10 degrees drop it's 1 psi, and every month that goes by ~1 psi worth of air also tends to seep out of the tires. Fill em up in the summer, and 3 months later and 30 degrees colder, you'd easily be down to about 30 psi from the regular recommended pressure of 36 psi.
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      10-03-2011, 02:21 PM   #5
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The tire pressure will definitely drop when it's cold. Just be sure to fill those up soon. I don't think you'll run into any problems cruising down to the gas station, depending on how far it is. It's definitely not recommended though.
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      10-03-2011, 09:23 PM   #6
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Quote:
Originally Posted by Kamal View Post
the rule of thumb is that for every 10F drop in temperature, psi will usually drop 1. Recommended tire pressures should be set on cold tires, not warm. If you're worried about it, short driving on the lower tire pressure is fine.
+1 for each of these 3 things.
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