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Originally Posted by rayxi
By my calculation the tire temperature would have to increase from 110 F to 342 F to increase the tire pressure 20 lbs from a starting pressure of 35 lbs. I'm not a racer so I don't know if that's possible or not. Your tire temperature would have to be 132F to get a 2 lb increase in pressure, which seems reasonable. 
My calculations do not account for the presence liquid water in the tire. It's more complicated in that case. Water vapor (humidity) make no difference as it behaves exactly as O2 or N2 behaves with regards to T vs P.
My take on the N2 fill is if it's free then why not - it can't hurt. If you have to pay and you are not racing then it's a waste of money. This is assuming you don't normally fill up your tires with a crappy air compressor that spits out slugs of liquid water once in a while because it doesn't have an air dryer. |
its hard to say.. air temp is different from track surface temp. and which is different from tire cord temp. i have to dig out my tire temps but 150 all across sounds right.
yes, compressed air has liquid in it. how many shops do you know actually drains their compressors everyday like they are supposed to? (i do btw). most tire shops i know only get their compressors drained when they call the air compressor technician to fix their compressor.. and i've seen buckets drained before...