Question:
I already know about following the recommended cold pressure labelled on the sticker in glovebox or side door. My dad, who's a mechanic, suggested the best time to check the pressure is of course before driving, especially before sunrise so tires won't be much exposed to heat from sunlight. I obviously know heat can cause the psi to increase, and I know heat is caused by friction from driving around, sunlight, and warm/hot weather. I'm just wondering if I can't wake up early enough to get accurate cold pressure readings, is there any way I can compare or convert current warm/hot pressure readings to what the psi would be like if tire was cold?
Answers:
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Tire Pressure changes about 1 PSI for every 10*F change in ambient temp.Normal Driving in average weather,,,a tire will gain about 5psi from "overnite cold" pressure setting.
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If you want a Running 35psi at Midday,,set them about 30~32psi Cold in the morning
Or set them at Desired Pressure while at operating temp,,,
understanding they drop 3~5 psi while shut down overnite.
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BEST,,,is to check & chart Frequently on a Specific set of tires,,,under specific conditions.
"YOUR tires,,how YOU drive"
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Different Cars,Tires,Sizes ,roads,,weather,altitude,drivi... style,Speeds,,Traffic conditions,,, all has an influence.
The number of variables is why we seldom see any temp correction info.
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Check YOURS a few times,,,and you'll get a good idea what THEY do.
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You'll probly find they fluctuate in a 3~5 psi range
**Another thing.the AIR SUPPLY they're filled from is also a variable.
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Tires filled from a Large Tank without Compressor Running,,,,get a shot of COLD air.
But if filled from a small compressor working itself ragged for several minutes to pressurize the tire,,,,thats much warmer air.
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Unless you are driving your car on the race track, or at speeds above the tire manufacturer's recommended safe speed, there is no need to worry about this. You can drive your car three thousand miles straight thru and the tires will not heat up enough to severely affect your tire pressure. Sunlight, warm weather, and driving all have minute effects on tire pressure, at the most, changing it by 1 psi or less.How do I get cigarette smell out of a new car?
Yes, there are two ways. Drive to Antartica and check your tire pressure or park in the refrigerator.More Questions & Answers ...
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