how long
#2
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I read somewhere recently that, if you've driven more than 5 minutes, it takes 2-3 hours for your tires to cool down for an accurate pressure reading. Seems like this would depend on how hard you were driving the car and what the ambient temperature is though.
I check tire pressure first in the morning before I move the car...usually once a week.
I check tire pressure first in the morning before I move the car...usually once a week.
#6
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Stock pressure is using 32psi all the way around (on S02).
This is actually a good subject in that I measure tire pressure once on the road for a while to let the tires heat up. Because then the air expands and you might be sitting with more pressure than nec. and the car won't handle right.
Example: I like my car to be 32 in front and 30 in rear when hot. How much variance will there be when they are cold? Also, what potential increases will there be when they heat up, if I fill them cold at the above temps.?
Deiger
This is actually a good subject in that I measure tire pressure once on the road for a while to let the tires heat up. Because then the air expands and you might be sitting with more pressure than nec. and the car won't handle right.
Example: I like my car to be 32 in front and 30 in rear when hot. How much variance will there be when they are cold? Also, what potential increases will there be when they heat up, if I fill them cold at the above temps.?
Deiger
#7
so 32 psi at 32f is more than 32psi at 82f? Maybe if I run my air hose thru the cooler with my beer I can save my extra air for later....anyone have a conversion table?
So is it the air temp or the tire temp?
an aircompressor intercooler....save ya lots of time at the track...
ok no more hot air jokes
fltsfshr
So is it the air temp or the tire temp?
an aircompressor intercooler....save ya lots of time at the track...
ok no more hot air jokes
fltsfshr
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#8
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The recommended pressure of 32 psi should be measured with the tires COLD, as in after sitting overnight. If you adjust pressure to recommended values when they are hot you will not be putting enough air into your tires.
On the track, tires generally increase 5-6 psi when run hard, sometimes more, so I'll guess that pressure will increase 3-4 psi on the road. It's a pretty easy thing to check, just adjust pressures in the morning, go for a spirited long drive and check the pressures again. Also bear in mind that pressures will increase as the tire warms up during the day. I know that just sitting in grid at an autocross with one side of the car in the sun may cause a 1-2 psi increase on the sunny-side tires compared to the ones in the shade.
I run slightly higher cold pressures than recommended (34 psi rear and 36 psi front) because it gives me improved road feel and longer wear (at the expense of ride comfort).
On the track, tires generally increase 5-6 psi when run hard, sometimes more, so I'll guess that pressure will increase 3-4 psi on the road. It's a pretty easy thing to check, just adjust pressures in the morning, go for a spirited long drive and check the pressures again. Also bear in mind that pressures will increase as the tire warms up during the day. I know that just sitting in grid at an autocross with one side of the car in the sun may cause a 1-2 psi increase on the sunny-side tires compared to the ones in the shade.
I run slightly higher cold pressures than recommended (34 psi rear and 36 psi front) because it gives me improved road feel and longer wear (at the expense of ride comfort).
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