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The tire pressure on the sidewall is the maximum COLD pressure. If you set 45 cold and do a track day where your pressure rises to 55 PSI you are still fine as far as the tire specs go. I suspect 55 PSI might not be the best pressure for grip however. I also suspect that 18 inch rims with very low aspect ratio tires need alot more pressure than the stock 16 inch rims. With that short of a sidewall I think that 35 PSI or less could result in a bent rim if you hit a minor pothole or pavement lip. I think your initial guess was pretty good, I'd keep them there.
-Andy
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72 Carrera RS replica, Spec 911 racer
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