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daktroub
Dodge Dakota
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2/05/2007
14:18:00
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 Subject: tirepressure
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Message:
Heres another question for you. If its extremely cold less than zero would you want to fill your tires to maximum psi. My tire says maximum 44lbs not would that only be for towing or should i set it at 40psi. Please let me know
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Kowalski
GenIII
2/05/2007
17:33:15
| RE: tirepressure
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Message:
Well, higher tire pressure can help a tire bite in the snow a little; but the rear of our trucks' tendency to hop over bumps in turns is worsened by high rear tire pressure. Not so bad with premium shocks.
Lead, follow, or get out of the way
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sneilan
Dodge Dakota
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2/05/2007
18:15:18
| RE: tirepressure
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Message:
40 up front, 35 in the rear.
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little jer
Dodge Dakota
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2/05/2007
21:35:43
| RE: tirepressure
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Message:
They say filling up your gas tank first thing in the morning when it is cold and the gas hasn't expanded yet is the smart thing to do as you will get more gas for the money. Don't know if it relly makes that much difference, but I have seen gas oozing out the filler on my old GTX when I did that so I think there's something to it. Filling up your tires with air to max when it is cold isn't the best for the same reason. Because when they get hot and the air expands you will be over inflated. I would say fill up to max if you need to when the temp is hot as the air is already expanded.
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N56629
Dodge Dakota
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2/06/2007
06:52:25
| RE: tirepressure
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Message:
Little jer is right about the air but wrong about the gas. Gasoline, in underground tanks, goes thru very little temperature change even thru various seasons and definately not thruout the day. It is easy to find the average ground temp in your area and calculate the expanse of gas based on the above ground temp.
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.boB
Dodge Dakota
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2/06/2007
13:15:23
| RE: tirepressure
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Message:
He's right about the gas. The gas in the underground tank does stay at a constant temp. But the air above ground and in your fuel tank does not. Add cold fuel to warm tank and it immediatly expands. It doesn't save you any money, but you can go longer on a tank of fuel.
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little jer
Dodge Dakota
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2/07/2007
01:28:05
| RE: tirepressure
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Message:
Yes, it's true. When I filled my tank up (sometimes the attendant would fill up all the way to the brim to make it an even dollar amount) in the morning, in the afternoon when it got hot the gas would start flowing down the side of the car from the gas filler. So I just stopped filling up.
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Kowalski
GenIII
2/07/2007
08:36:01
| RE: tirepressure
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Message:
No, little jer, it's the info presented by N56629 that is true. For example, those underground tanks will stay around 50 degrees in my climate. You could fill at any time of day, say cooler night time even; and if you parked it you'd see the overflow after the heat of the next hot day. It doesn't immediately completely expand, but rather takes a while. This is because the ground is a better heat sink than a gas tank in air.
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little jer
Dodge Dakota
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2/07/2007
10:05:08
| RE: tirepressure
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Message:
I did say that - filled up in morning and by afternoon ( it was a hot day) it was oozing out. I had to siphon some out to get it to stop. and I had just waxed my car too!
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choochoo
Dodge Dakota
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2/08/2007
21:57:37
| RE: tirepressure
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I live where it can easily be 20 below, so I just set my tire pressures at about 3/4 of max when it gets cold and leave it there.
If the temp really drops overnight then I give the tires a visual before driving. The pressure drops about 1 psig for every 4 degree drop. Opposite in summer.
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truck guy
Dodge Dakota
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2/13/2007
15:13:48
| RE: tirepressure
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Message:
Hey boys, I thought he asked about tires. Just so everybody knows you should always check tire pressure with the tire cold. A cold tire is one that has not been driven on for no more than 1 mile. As a tire travels down the road it heats up. Tire companies have taken all the guesswork out for us. Just bring tires to the pressure stamped on the side of the tire (WHEN COLD) that's it. You can play with the pressure up/down depending on what kind of drivin you'll be doin. In sand you want low pressure and at the drag strip you want high pressure. It's that easy. Have fun!
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Kowalski
GenIII
2/13/2007
15:56:49
|  RE: tirepressure
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Message:
Yup, he asked about the tires before little jer got off track with a bit of misinformation about gas; so we took the opportunity to explain the differences caused by heat sinks of different densities. The time of day you fill with doesn't matter as much as the temperature differnce the fuel sees. But back to the tires - not quite as simple as you might think though. Your recomendation for the drag strip would be good for the front tires where you want less rolling resistance; but most will air down the rears for a better launch.
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sneilan
Dodge Dakota
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2/13/2007
16:07:12
| RE: tirepressure
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the vehicale manufacturer took all the guess work out of it too. look on your door jam, there will be a sticker there with a bunch of info on it including tire psi for front and rear. the pressure on the sidewall of the tire is the max recomended cold pressure for that tire. most cars run aroudn 32-34psi, light trucks with P-metric tires run 35, and LT tires run anywhere from 40-90psi depending on what truck and if it's 8, 10, or 12 ply.
Sean Neilan
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little jer
Dodge Dakota
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2/14/2007
01:14:39
| RE: tirepressure
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Message:
wait a min kowalski, u yapped but weren't answering the question he asked, whether to fill to max pressure when it is cold. My answer was not misinformation. It was correct - gas will expand in your tank when it gets hot and so will air in your tires. And I used it as a correlation as to expansion if temp is hot or cold.
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Kowalski
GenIII
2/14/2007
08:24:51
|  RE: tirepressure
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Message:
I gave him the info needed to make an informed decision.
None of us ever said that fuel or air won't expand when heated. The point we tried to make with you was simply it was the temperature change that made the difference; not the time of day it was pumped. Fuel stored underground stays at a fairly stable temperature, regardless of the time of day.
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little jer
Dodge Dakota
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2/14/2007
09:51:50
| RE: tirepressure
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Message:
And I agree with the underground tank too. My point as to time of day was hypothetical, and just using a morning fillup as to when the air temp would be coolest and most likely nearest the temp of the gas coming out of the tank.
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Kowalski
GenIII
2/14/2007
12:04:26
|  RE: tirepressure
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Message:
Allow me to quote you here. "They say filling up your tank first thing in the morning when it is cold and the gas has not expanded yet is the smart thing to do as you will get more gas for the money". Wether you consider that hypothetical or not isn't the point. Our point is simply that that is false; since the temperature of gas stored underground does not tend to vary much with the time of day.
Understand our point now ?
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truck guy
Dodge Dakota
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2/14/2007
12:33:20
| RE: tirepressure
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Message:
Your right Kowalski, at the drag strip you just want to load up the front tires. Sorry for not being clear with my instructions.
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little jer
Dodge Dakota
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2/14/2007
19:27:30
| RE: tirepressure
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The veil has been lifted. I think I read that in a magazine or newspaper column. maybe they didn't know what they were talking about or failed to see that no matter what tme they filled up the gas would be cooler. Unless they lived in a geothermal area where underground is hotter than above.
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Hammerdak
Dodge Dakota
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2/16/2007
21:52:32
| RE: tirepressure
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Message:
Plus ,to save you guys the trouble of trying to save money by
buying cold gas vs warm gas, all pumps are calibrated to give an
equivalent volume at a specific temperature ( something like 68*F)
and adjusts the volume being despensed to that equivalent.
The cerfification and temp is right on each and every pump.
The oil companies don't miss a thing when it come to ensuring
their profits.
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