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I have a 2,450lb Backdraft that came with Goodyear F1's (although I no longer run F1's) and I run 25psi all the way around. I came to use this pressure using a tire pyrometer.
You can do like Gary said and start out with what the tire manufacturer recommends and work down from there. Do not work up as your car is lighter, not heavier than the average car that would use those tires.
My current tires BFG Rival 255/40/17 and Nitto NT05 315/35/17. BFG will not make a 17" Rival wider than 255 until late 2015.
Kevin.....
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