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Old 02-18-2012, 11:37 AM   #18
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I believe the pressure listed in the book and door pillar is for a maximum weight condition. Most people people not use there vehicle like that. If the tires are inflated to allow for maximum weight, and you only carry yourself 95% of the time, the tires will wear out prematurely, and you will not have maximum traction. Slightly vary your pressure to match your load.

This is much more important on a pickup for instance.....70 or 85 psi is not needed to carry myself. Now if you drop in 3500lbs in the box, you better air them up.....which I do.

If extra tire wear is not an issue with you, then air them to the manufacturers sticker all the time. Just my 2 cents.
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Old 02-18-2012, 12:19 PM   #19
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Originally Posted by One-Bad-SS View Post
I searched but have not found the answer to this question....

The Pirelli P-Zero's sidewall states a max pressure of 50 PSI, the car's tag says 36 PSI, it appears the TPMS goes off at under 32 PSI...I was always taught not to follow the tag cuz you never know if the tires have been changed from manufacture's specs...so I've always adheared to the sidewall. Is everyone else doing so? Not looking to wear these out in 15K.

It would seem GM set the low pressure warning for these tires too low, if that is the case. Cold, they should hold about 45 PSI and will warm up close to max. Logical right? Can we set the TPMS to alert for higher pressures, say 40PSI closer to the tires actually rating?

OK, let's hear it. Thanks.
Whoever told you not to follow the Manufacurer's specs was mistaken. You should always follow the recomendations on the door jamb sticker or owners manual. The max pressure on the sidewall of the tire is just that, the max pressure that you can inflate the tire, before it becomes an explosion hazard.
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Old 02-18-2012, 12:30 PM   #20
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Originally Posted by Comrando View Post
If you have the tires filled with nitrogen you will only see 2-4psi difference between the coldest days and the hottest. They also lose less pressure over time.
Actually this is false. Pressure change is a set amount across all gases. It doesn't change from one gas to another. Nitrogen, oxygen, helium, hydrogen, etc they all expand and contract with temperature at the same rate.

Also air is over 70% nitrogen

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Originally Posted by suplex View Post
I had always thought it was 1 PSI for every 10 degrees temperature difference. However, if that's true, what do they consider the "starting" temperature?

Let's say they refer to 70 degrees as the initial temperature, and your car is supposed to be at 35 PSI when it's 70. I would assume that means that if it's 40 degrees out, you should set your tires to 38 PSI, and if it were 100 degrees out, then set the tires to 32 PSI. So if it's hotter out the PSI goes down, and if it's colder out the PSI goes up.

Am I correct according to my above example?
The friction of driving will heat up the temperature of the tires to the same temp eventually. The only difference is the length of time it takes to get there. During the winter you want to have your tires a little less PSI then summer because during the winter there will be a larger temperature change.
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Old 02-18-2012, 12:38 PM   #21
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Originally Posted by One-Bad-SS View Post
I did the math, not sure if that's allowed in this Forum, but anyway...our cars weight a little over 2,000 lbs so each tire is carrying 500lbs, well under the carrying capacity of the tire. .

Ummm, you may want to double that figure, the camaro weighs in at close to 3800 lbs.
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Old 02-18-2012, 12:41 PM   #22
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Ummm, you may want to double that figure, the camaro weighs in at close to 3800 lbs.
With a full tank of gas and a driver it is almost 4,200.
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Old 02-18-2012, 12:45 PM   #23
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I go with the 36 cold off my own tire gauge...the dash reading has never matched yet!
^^This^^
My dash reading always read 1 or 2 PSI high.
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Old 02-18-2012, 12:49 PM   #24
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i keep mine at 33 cold.
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Old 02-18-2012, 01:46 PM   #25
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Summer tires = 36 psi

Winter tires = 38 psi

Nitrogen is used because it does not bleed off as fast as regular air.
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Old 02-18-2012, 02:34 PM   #26
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Originally Posted by Caspers2SSRS View Post
Unbeknownst to most is the correct formula used to determine the recommended cold tire air pressures of any passenger automobile. Its pretty simple

The gross vehicle weight divided by one hundred (GVW in lb/100) equals the recommended tire PSI when cold.

For example: Your Vehicles weight with a full tank of fuel plus the load capacity of passengers and cargo. Lets say yours is 3700 pounds.

3700/100= the recommended cold PSI is 37.
dont do that. just chance that works on passenger cars, but not so much on a 80,000 lb semi. or maybe a 10,000 lb monster truck (those run 4 psi). see the problem with that? the psi is determined by several things, not just load. every tire that that can fit on these cars will work just fine at 36 psi. 35 is generic for all tire guys.

nitrogen is used mostly because of the reduced expansion, but also because of the larger sized molecules to reduce air escape.

and comrando
Boiling point????? what are you doing to your tires???
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Old 02-18-2012, 02:37 PM   #27
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Sorry about the math thing, see my build sheet attached. Apparently they gave the metric weight. I just checked the car's data plate and it's about 4600 LBS. Still 1,150 per tire is well under.

I knew we shouldn't talk math.
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Old 02-18-2012, 03:22 PM   #28
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Sorry about the math thing, see my build sheet attached. Apparently they gave the metric weight. I just checked the car's data plate and it's about 4600 LBS. Still 1,150 per tire is well under.

I knew we shouldn't talk math.
Yea. Our cars are built in Canada - so metric. That is one thing I love about our cars though, bolts and nuts are all in mm. SO much easier to work with.
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Old 02-18-2012, 03:23 PM   #29
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mine are on cold 36psi. i just follow whats written inside the car.
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Old 02-18-2012, 03:24 PM   #30
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and whats the car monitor says is never correct, specially after 1 or 2 hours on the highway, always far too high.
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Old 02-18-2012, 04:52 PM   #31
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36 is correct, always follow the cars recommendation for proper handling.
Yeah , at 36 psi , but on which gage , there will be at least a dozen or so different readings on one tire at anytime .
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Old 02-18-2012, 07:06 PM   #32
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Originally Posted by Parag View Post
the max psi is for setting the bead. for stock size always go with the body tag. but if you put 22's on, you want to adjust accordingly
Just curious... what would 'accordingly' be? I always use 38, anything less and the car feels sluggish for some reason, like you're carrying a flat.
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Old 02-18-2012, 07:15 PM   #33
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Yeah , at 36 psi , but on which gage , there will be at least a dozen or so different readings on one tire at anytime .
an analog gauge. You should keep one in your glove box - though most people don't.
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Old 02-18-2012, 10:48 PM   #34
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