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Old 02-18-2012, 11:51 AM   #26
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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.
Only if they had the same boiling point, which they don't.

Another reason to use nitrogen is to reduce the amount of moisture in the tire. Moisture will lower the boiling point.
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Old 02-18-2012, 12:46 PM   #27
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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, 01:34 PM   #28
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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, 01:37 PM   #29
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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, 02:22 PM   #30
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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, 02:23 PM   #31
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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, 02:24 PM   #32
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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, 03:52 PM   #33
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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, 06:06 PM   #34
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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, 06:15 PM   #35
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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, 09:48 PM   #36
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36
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Old 02-18-2012, 10:07 PM   #37
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and comrando
Boiling point????? what are you doing to your tires???
Smokin' 'em
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Old 02-19-2012, 10:54 AM   #38
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Also, if you over inflate your tires your car will ride like a folk lift, (rough as hell). Your tire absorb a lot of the road's irregularities, like pot holes, railroad tracks, ect.
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Old 02-19-2012, 11:16 AM   #39
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Originally Posted by Comrando View Post
Only if they had the same boiling point, which they don't.

Another reason to use nitrogen is to reduce the amount of moisture in the tire. Moisture will lower the boiling point.
All gasses obey the gas law, PV=RT. The only benefit is that the Nitrogen will be free of water, which will turn to gas if the air in your tires reaches 100 deg C. That's not gonna happen, except on the racetrack, maybe.

But the gasses in the atmosphere all stay gaseous at any temperature you will ever encounter, and so will all see the same pressure increase.

Nitrogen in tires is BS.
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Old 02-19-2012, 11:19 AM   #40
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Quote:
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.
Do you have a source for this formula....I think it Unbeknownst to most because this is pure BS....(its very good BS though). I think I'll stick with going by what the engineers at the Manufacturers Research and Development Department came up for a recommended cold pressure as long as I have stock size tires.
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Old 02-19-2012, 11:22 AM   #41
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36
Is this for each tire?? or the cumulative total of all four...lol
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Old 02-19-2012, 11:28 AM   #42
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I keep mine at 36. Always go with the vehicle recommendations
This, it is on area where the door closes (Drivers side). It tells you how much pressure
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Old 02-19-2012, 11:30 AM   #43
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All gasses obey the gas law, PV=RT. The only benefit is that the Nitrogen will be free of water, which will turn to gas if the air in your tires reaches 100 deg C. That's not gonna happen, except on the racetrack, maybe.

But the gasses in the atmosphere all stay gaseous at any temperature you will ever encounter, and so will all see the same pressure increase.

Nitrogen in tires is BS.
Not really BS at all. We use it at work all the time on the Aircraft. Nitrogen is far more superior then air
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Old 02-19-2012, 12:01 PM   #44
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Not really BS at all. We use it at work all the time on the Aircraft. Nitrogen is far more superior then air
Nitrogen in aircraft and nitrogen in cars are to different monsters.

It has been proven that there are benefits to nitrogen in aircraft due to the pressure and temperature differences between ground level and cruising altitudes. However in automobile tires there haven't been any proven benefits over normal compressed air. Race cars and dragsters are the exceptions.
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Old 02-19-2012, 12:31 PM   #45
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Is the low pressure alarm suppose to go off at 32psi? I came back from a deployment and one of my tires was at 25psi and I didn't get any alarm.
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Old 02-20-2012, 06:36 PM   #46
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when I put air in I usually put it to 38 and let it gradually go down to 33-35 then fill them again, usualy takes a few months. I don't sweat it too much just as long as it is about 33-34 and there all about the same!
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Old 03-20-2012, 01:15 AM   #47
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I set my 20 inch pirellis at 45 pounds cold. I want to decrease rolling resistance a bit since I do alot of highway driving during the week( got car last may, have 79,800 miles on it now :-( ) and during the weekends i make it a point to never waste a good corner with halfhearted driving. I dont recall how long the rear tires lasted, they did go first due to nail damage...but the front pirellis lasted for 57K miles of even wear. I offer that merely as anecdotal evidence and my personal preference. I wont argue against anyone who maintains that the sticker is always right.
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Old 03-23-2012, 08:51 AM   #48
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Checked mine today (yesterday got two new fromt tires unde warranty @ 917 miles total on car!) and all tires were at or just below 30psi from dealer. I bumped it up to 38 all the way around.

I know on my C5 vette if I over inflate the DIC let's you know... Max for vette to not get warning was 42psi. So I did 38 so when they warm up there is no DIC warning. Max on those tires is 51.
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Old 03-23-2012, 11:32 AM   #49
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It appears a great many are as crazy about tire pressure as I am. Here is my solution. the dash is close to the truth, but this thing is exactly right all the time. I swapped tires to 275's and 305's. Routinely run 37 lbs to keep my wider tires from cupping and the dash always sees it as a bit higher. I only use the dash to monitor the change as the tires warm up.
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Old 03-23-2012, 01:06 PM   #50
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I always set mine at 38 cold, every month or so I have to bump them back to 38.
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