02-18-2012, 09:44 AM | #15 |
Caspers2SSRS
Drives: Summit White 2010 2SS/RS Camaro Join Date: Jul 2010
Location: Somewhere north of a midlife crisis.
Posts: 2,865
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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. The cold pressure recommendation is generally within 5 pounds on the tires PSI once it has warmed to road surface use tempature's. Heavier use such as road racing and drifting may cause the tire PSI to increase above these of course. Over loading the weight carrying capacity of the vehicle will also cause the tires PSI to increase and may cause failure, Obviously there are lighter and heavier Gross weights among automobiles using the same size tires and thus the variances noted of a allowable maximum tire pressure on the tires sidewalls. Its also important to remember that proper alignment settings of the vehicle is crucial to even tire wear and safety. It plays a role in how the tire makes contact with the road surface and thus the amount of heat created inside the tire, raising the PSI. Theres is a significant connection between tire inflation PSI and improper caster and toe in settings. Improper settings increase the amount of heat/friction created that directly affects the tires by inordinately increasing tire PSI under use, in as much safety and longevity. |
02-18-2012, 10:18 AM | #16 |
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open owners manual...if that does not work..open drivers door..there is a sticker with info. 36psi
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02-18-2012, 10:22 AM | #17 |
So easy to love Camaros
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See attached max pressure. 50 PSI it is. Think I found my own answer below. Looks like the setting should be at 36 cold. Will make the adjustment. Thanks for weighing in. I love this site.
Maximum Inflation Pressure A tire's maximum inflation pressure is the highest "cold" inflation pressure that the tire is designed to contain. However the tire's maximum inflation pressure should only be used when called for on the vehicle's tire placard or in the vehicle's owners manual. It is also important to remember that the vehicle's recommended tire inflation pressure is always to be measured and set when the tire is "cold." Cold conditions are defined as early in the morning before the day's ambient temperature, sun's radiant heat or the heat generated while driving have caused the tire pressure to temporarily increase. For the reasons indicated above, It is also normal to experience "hot" tire pressures that are up to 5 to 6 psi above the tire's recommended "cold" pressure during the day if the vehicle is parked in the sun or has been extensively driven. Therefore, if the vehicle's recommended "cold" inflation pressures correspond with the tire's maximum inflation pressure, it will often appear that too much tire pressure is present. However, this extra "hot" tire pressure is temporary and should NOT be bled off to return the tire pressure to within the maximum inflation pressure value branded on the tire. If the "cold" tire pressure was correctly set initially, the temporary "hot" tire pressure will have returned to the tire's maximum inflation pressure when next measured in "cold" conditions. A tire's "maximum inflation pressure" may be different that the assigned tire pressure used to rate the tire's "maximum load." For example, while a P-metric sized standard load tire's maximum load is rated at 35 psi, many P-metric sized standard load performance and touring tires are designed to contain up to 44 psi (and are branded on their sidewalls accordingly). This additional range of inflation pressure (in this case, between 36 and 44 psi) has been provided to accommodate any unique handling, high speed and/or rolling resistance requirements determined by the tire and vehicle manufacturers. These unique tire pressures will be identified on the vehicle placard in the vehicle's owner's manual. The tire's maximum inflation pressure is indicated in relatively small-sized print branded near the tire's bead (adjacent to the wheel) indicating the appropriate value. Because tires are global products, their maximum inflation pressure is branded on the tire in kilopascals (kPa) and pounds per square inch (psi). These values can also be found in the industry's tire load & inflation charts. 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. Even adding in passengers, cargo and throughing the beastie into hard corners, those tires don't get near thier max pressures. Nail in the coffin shows 36 is a good number.
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02-18-2012, 10:37 AM | #18 |
Drives: 2011 Race Red GT500 w/ SVT Perf Pkg Join Date: Mar 2009
Location: eastern CO
Posts: 578
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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. |
02-18-2012, 11:19 AM | #19 | |
Drives: 2010 RJT 2SS M6 Camaro Join Date: Feb 2011
Location: Garrison,KY
Posts: 1,548
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Quote:
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02-18-2012, 11:30 AM | #20 | ||
Drives: 2SS/RS Join Date: Sep 2008
Location: Western North Carolina
Posts: 7,225
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Quote:
Also air is over 70% nitrogen Quote:
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02-18-2012, 11:38 AM | #21 | |
Drives: Fifty 2SS Vert Join Date: Dec 2009
Location: That rock next to Vancouver
Posts: 355
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Quote:
Ummm, you may want to double that figure, the camaro weighs in at close to 3800 lbs. |
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02-18-2012, 11:41 AM | #22 |
Drives: 2SS/RS Join Date: Sep 2008
Location: Western North Carolina
Posts: 7,225
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02-18-2012, 11:45 AM | #23 | |
Drives: '06 Tacoma, '11 Durango, '12 SW 1SS Join Date: Aug 2011
Location: Carson City
Posts: 400
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Quote:
My dash reading always read 1 or 2 PSI high.
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2012 1SS LS3; Borla S type axle back and CAI, Inc. cold air induction.
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02-18-2012, 11:49 AM | #24 |
OKCamaros
Drives: 4 banger Diesel Join Date: Mar 2010
Location: Philippines
Posts: 4,572
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i keep mine at 33 cold.
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02-18-2012, 12:46 PM | #25 |
knows 2 facts about ducks
Drives: ...and they're both wrong Join Date: Aug 2009
Location: The HMS Invincible
Posts: 25,072
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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. |
02-18-2012, 01:34 PM | #26 | |
Drives: 2010 camaro 2SS LS3 Join Date: Aug 2011
Location: Denver
Posts: 1,334
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Quote:
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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stage III cam, 4.10's, custom CAI, suede headliner
461 RWHP, 422 RWTQ |
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02-18-2012, 01:37 PM | #27 |
So easy to love Camaros
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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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02-18-2012, 02:22 PM | #28 |
knows 2 facts about ducks
Drives: ...and they're both wrong Join Date: Aug 2009
Location: The HMS Invincible
Posts: 25,072
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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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Tags |
pirelli, pressure, psi, tire pressure, tires |
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