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Quick Wheel PSI ?

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Old Nov 21, 2006 | 09:41 PM
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Default Quick Wheel PSI ?

Hey guys,

Driving the Vette for the last time this week while I am home for Thanksgiving up until Sunday. When I got into the car I switched the gages and noticed that the psi was real low for the wheels (25). Now I know that the psi for the wheels are are less this time of the year compared to the summer, but I wanted to know what a good psi is?

In the summer they were running around 34 Hot, and 32 Cold. Right now as I said they are about 25 cold and even though I only drove for about 20 minutes, they only warmed up to about 28.

I am in New Jersey, its about 34 degrees here this time a year, what psi should I be running cold? Like when I turn the car on? I think I need some air in the tires, 25 seems a little low... ?

Thanks guys!
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Old Nov 21, 2006 | 09:47 PM
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I try to keep my tires at 30 psi hot regardless of the weather. It means that you have to check often and adjust as needed. Probably this time of year, 28 or so psi cold would do the trick.
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Old Nov 21, 2006 | 10:23 PM
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Ok so I am running 25-26 cold, so in other words I need to put some air in to get it up to around 28?
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Old Nov 21, 2006 | 10:24 PM
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I keep my tires between 30 - 32 psi year round, in the summer that means they start lower because the tires get hotter. In the winter, they run around 29 cold.
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Old Nov 21, 2006 | 10:33 PM
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Originally Posted by Meebix
Ok so I am running 25-26 cold, so in other words I need to put some air in to get it up to around 28?
Keep an eye on the wear, if you run below 30 cold, you may see wear on the outside of the tire. Too much air and the wear is in the center. The door says, 30 cold, I try to keep mine there year around. If the DIC says below 26, you'll start to see tire low warnings.
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Old Nov 21, 2006 | 10:43 PM
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Ambient temperature has a marked effect on tire pressure. In fact, I read that every 10 degrees could change the pressure by one pound. I purchased a portable compressor that charges on AC current as well as through the lighter. I keep the pressure at 30psi all year. In the summer, on the highway, in hot weather, the gauges can read 36psi.
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Old Nov 21, 2006 | 10:57 PM
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Ok so I am going to try to keep them around 30 psi...

Might be a dumb question, but bare with me... When I put the air in, can I just turn the car on and look at the sensor to tell when Im at 30? Or how do I know when I have put enough air in to reach 30 psi?
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Old Nov 21, 2006 | 11:09 PM
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Get a tire pressure gauge and check your tires often. GM recommends 30 psi cold.
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Old Nov 21, 2006 | 11:28 PM
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Ok and as for the tire pressure gauge, I can just go grab a $15 one from an autoparts store and I'm set?
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Old Nov 21, 2006 | 11:43 PM
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Originally Posted by Meebix
Ok and as for the tire pressure gauge, I can just go grab a $15 one from an autoparts store and I'm set?
I would strongly suggest a "digital" gauge. They have an LCD readout window. Mine reads in half pound increments. They are inexpensive and can be bought from Corvette mailorder houses and even Auto Zone, Walmart,Napa, ETC.
PS. I run my runflats at 29 psi cold no matter what time of the year. I am also in New Jersey.
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Old Nov 22, 2006 | 12:09 AM
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Digital sounds good, but I don't want to spend a fortune to just check the tire pressure every now and then, even though it is essential.

What is wrong with something like this?

http://www.partsamerica.com/ProductD...tnumber=DT142B
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Old Nov 22, 2006 | 02:57 AM
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That tire guage looks fine Meebix.
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Old Nov 22, 2006 | 04:07 AM
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Originally Posted by Meebix
Ok so I am going to try to keep them around 30 psi...

Might be a dumb question, but bare with me... When I put the air in, can I just turn the car on and look at the sensor to tell when Im at 30? Or how do I know when I have put enough air in to reach 30 psi?
The sensor doesn't give an accurate reading until the car has been moving for a few seconds so you can't use the DIC to set the pressures. In my case it's been up to a minute before the correct pressure registers
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Old Nov 22, 2006 | 07:26 AM
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30 cold. I believe the car has to break 15 mph for the sensors to work, so you need a gauge.
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Old Nov 22, 2006 | 08:06 AM
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Originally Posted by Meebix
Ok so I am going to try to keep them around 30 psi...

Might be a dumb question, but bare with me... When I put the air in, can I just turn the car on and look at the sensor to tell when Im at 30? Or how do I know when I have put enough air in to reach 30 psi?
No, your car must go 5-15 mph BEFORE starting to register pressures. Even then, if you have series 2 (2001-2004) sensors, they do NOT update in real time (to save batteries, they will respond imediately to low air pressure).
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Old Nov 22, 2006 | 09:43 AM
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Originally Posted by JDs00PewterCoupe
I try to keep my tires at 30 psi hot regardless of the weather. It means that you have to check often and adjust as needed. Probably this time of year, 28 or so psi cold would do the trick.
That's what I run.
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Old Nov 22, 2006 | 11:14 AM
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Some say 30 psi hot. Most say 30 psi cold, which is what the General recommends. No matter which school of thought you go with, use the TPS system to monitor tire pressures but use a good tire guage to more accurately check the pressures. I have found the tire pressures indicated on the DIC to be a little off when compared to the readings I get with my tire guage, which I trust more.
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Old Nov 22, 2006 | 12:36 PM
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Ok guys sounds great! Thanks for all the info so quickly.
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Old Nov 22, 2006 | 05:58 PM
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Originally Posted by Meebix
Ok so I am going to try to keep them around 30 psi...

Might be a dumb question, but bare with me... When I put the air in, can I just turn the car on and look at the sensor to tell when Im at 30? Or how do I know when I have put enough air in to reach 30 psi?
Just get a decent gauge to check the cold pressure with. The sensors take a couple of miles to update the pressure readings.
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Old Nov 23, 2006 | 01:52 PM
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Default tire pressure

When setting tire pressure I ALWAYS use a guage. And if the Air Station is one which has a pressure regulator that lets in a measured amount of air and dings each time it supplies more air I set the numbers around 30 or maybe higher as the stations seem to run LOW. Then I let the tire take at least 3 dings (if not you let out some air and try again)
and use that setting for the other 3 tires. You will get the SAME PRESSURE in ALL TIRES that way. Should do this with tires COLD (driven less than a mile or so) if they are HOT then go for 33 to 35 # of air. TPS don't accurately indicate pressure. Use your guage and you will be fine. BIGHANK
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