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So I went searching for the equation and did find stock cars mentioning tuning their tires but the calcs called for more measurmens than I cared to try.
I found this on a search --
"we received the following rule of thumb from Oscar Pereda, an engineer for BFGoodrich. He calls it a "realistic starting point," saying it has never been just right, but is a good place to start. The rule is:
(Vehicle Weight in lb/100) + 2 psi at heavier end + 2 psi all around if suspension and alignment are stock.
Example: Stock 911, 3,000 lb.
(3000/100) = 30 psi
Add 2 psi all around = 32 psi
Add 2 psi to heavy end = 34 psi at rear
With modified suspension, the result is 30 psi front, 32 psi rear.
Read more: http://www.modified.com/tech/0208scc_tire_pressure_guide/#ixzz2yrONKp8s
Not sure about thecurb weight of my car with the 17 inch wheels but on a 15 inch wheel a 2002 Volvo S60 Curb Weight 3146 lbs. Tires / Wheel Size P195/65HR15
So if my four 17 inch wheels take that weight up to 3200 that would mean
3200/100 = 32
Add 2 PSI all around = 34
Add 2 PSI to heavy end = 36
But wait now --- what about adding passengers? If the normal daily drive contains two passengers it could add another 350 pounds to the curb weight. That would mean a curb weight of 3550
3550 / 100 = 35.5
Add 2 PSI all around = 37.5
Add 2 PSI to the heavy rear = 39.5
I also ran across articles expressing that even if your tires heat up to max pressure that is quoted on the sidewall, experiencing a burst tire is very unlikely. One quote said that even though tire manufactures don't give out their burst strngth he is confident that it is easily at double the sidewall max pressure quote.
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