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Old 02-19-2012, 11:54 AM   #35
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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, 12:16 PM   #36
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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, 12:19 PM   #37
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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.
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, 12:22 PM   #38
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Originally Posted by Earl View Post
36
Is this for each tire?? or the cumulative total of all four...lol
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Old 02-19-2012, 12:28 PM   #39
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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, 12:30 PM   #40
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Originally Posted by Rock-It Man View Post
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, 01:01 PM   #41
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Originally Posted by mikeyroche View Post
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, 01:31 PM   #42
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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, 07:36 PM   #43
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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, 02:15 AM   #44
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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, 09:51 AM   #45
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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, 12:32 PM   #46
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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, 02:06 PM   #47
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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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Old 08-27-2013, 01:50 PM   #48
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Leaving thread to much math!
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Old 08-27-2013, 05:37 PM   #49
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Follow the door placard. Max is just that Max not what you should run.
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Old 09-01-2013, 05:22 PM   #50
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Tire Air Pressure

I air at 36 lbs cold and use an Aircomp 3" 270* sweep tire gauge. It is really accurate and easy to air at 1/2 lb setings. When I go from 5,000 feet MSL here in CO mountains to a state less than 1000 feet I'll inflate to 38 pounds ahead of time otherwise I'll be low when I get to the destination. I have almost 20K on my factory Pirellis and they look like I'll get another 5K before changing. Then I'm going with Continnental Extreme DWS all season tires warranteed for 50K miles. Those tires I can rotate side to side.
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Old 11-30-2014, 08:46 AM   #51
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While the door sticker says 36 pounds for each tire, it might not be the optimal for balance (perhaps unless the car is bone stock, and even then perhaps tire tread depth/compound might play a role). Here's some old school but still relevant information (even has an IROC ):

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