Quote:
Originally Posted by solstice
...Show me a car/tune that continue to gain hp when exceeding +220 CR x psi on street gas and you'll change my view. The S55 is stock at 10.2 x 18 = 183...
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The 18psi published for the S55 is what it is capable of in order to compensate for low pressure atmospheric conditions like at high altitude, or when the air is very hot and the density decreases. For sure it is not always running at this pressure, otherwise the torque curve would not have had such a pronounced flat plateau, created by the ECU artificially limiting the boost.
I am guessing the actual "normal condition" max psi on the stock S55 is going to be ~14 psi to make the 431 hp.