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07-18-2014, 12:14 PM
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#1 |
 
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PSI varies
i have a 2013 1SS/RS (not a daily driver) and i notice that the PSI varies from when the car sits and then once the tires get warmed up. My PSI while car is parked for a while in garage can all the way down to 30-32 PSI but as soon as i drive her it goes up to 35front and 36back is that normal - or should i not worry about it?
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07-18-2014, 12:18 PM
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#2 |
          
Drives: Race Car Join Date: Sep 2009
Location: Seffner, FL
Posts: 6,226
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Yes....normal. Pressure increases as tire temp increases. Perfectly normal. Tire pressures should be checked cold. You can use nitrogen if you want and the pressure variance will be less....but either way....not a big deal.
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07-18-2014, 12:20 PM
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#3 |
 Drives: Car Join Date: Dec 2013
Location: Earth
Posts: 185
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Completely normal. When tires heat up the pressure goes up. This is why you must always go by the PSI when completely cold. PSI should be 36 cold. My sensors read 3 pounds low so I know I'm good if they are at 33 when cold.
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07-18-2014, 12:33 PM
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#4 |
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376 cubic inches of fun
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PV=RT
The only thing you should worry about is that 30 PSI cold is too soft. Inflate your cold tires to 36 PSI, early in the day, before the sun shines on them. |
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07-18-2014, 12:37 PM
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#5 | |
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"Katy"
Drives: 2014 2LT A6 'Vert Join Date: Feb 2014
Location: Western New York
Posts: 1,076
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Quote:
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2014 Black 2LT Convertible
Elite Engineering Catch Can, Vitesse Throttle Controller, CAI Cold Air Intake Possible next mods: Throttle Body Exhaust Upstate C5 Member No, that is not me in the avatar..... I just love hot girls and hot cars.... or hot girls IN hot cars.... |
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07-18-2014, 12:53 PM
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#6 | |
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Drives: 2018 GT350 Join Date: Nov 2011
Location: PA
Posts: 2,719
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Quote:
PV=nRT If volume stays the same, the moles and gas constant stay the same, and your temp goes up (friction creates heat...)...your PRESSURE goes up. Wasn't this 9th grade physics?
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07-18-2014, 12:54 PM
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#7 | |
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Drives: 2018 GT350 Join Date: Nov 2011
Location: PA
Posts: 2,719
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Quote:
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07-18-2014, 12:56 PM
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#8 | |
Drives: 2013 1SS 1LE Black - Std Exhaust Join Date: Mar 2013
Location: Brunswick, GA
Posts: 3,622
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Quote:
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07-19-2014, 06:48 PM
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#9 |
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Stovebolt BluFlame 6
Drives: '12 2LT/RS, IBM; '20 Traverse Prem Join Date: Oct 2011
Location: Wherever!
Posts: 893
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Don't they teach any principles of science in any school anymore?
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07-19-2014, 09:19 PM
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#10 |
 
Drives: 2017 2SS M6 Join Date: Jun 2013
Location: WNY
Posts: 7,070
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36 for SS P zeros?
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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07-20-2014, 12:44 AM
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#11 | |
Drives: 2014 Camaro 1LT/RS Join Date: Sep 2013
Location: Arizona
Posts: 1,693
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Quote:
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Detailing is an involuntary obsession.
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07-20-2014, 02:00 AM
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#12 |
Drives: '04 Z06, '14BMW M235i, '15 SS/1LE Join Date: Feb 2014
Location: San Diego/Los Angeles
Posts: 845
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I drive about 1500 miles a month and I inflate my tires cold to 38. The ride seems a little harsher but I only need to fill air every other month
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07-20-2014, 04:09 AM
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#13 |
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Geoff
Drives: 2020 ZL1 Green Join Date: May 2013
Location: Houston
Posts: 1,720
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Check the driver's door sill (lower rear) area for your car's correct pressure
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07-20-2014, 09:10 AM
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#14 |
Drives: '12SS/2SS/45TH-'06 2500HD/Silverado Join Date: Jul 2012
Location: Fairfax, VA
Posts: 2,107
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PZeros are supposed to be 36 cold. I like mine about 1-2 lower than that in the warm weather because I found that at 36, they get too high and wear more in the center than evenly to the outside. Since lowering it, they are wearing more evenly when hot.
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 2012 Camaro SS 2SS 45TH Anniversary Edition |
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