12psi is not 12psi nor 12psi nor 12psi. The mass of air pushed is what matters. Pressure is used and talked about because it's easy to measure; however, temperature has a huge effect on the mass of air that a given pressure in a given volume indicates.
12psi and below is the range where you don't really need intercooling or aftercooling. You can cool any forced induction air charge. The piece of hardware used with turbos is called and intercooler the piece of hardware used with superchargers is called an aftercooler. 6 of 1 half a dozen of the other.
If you have a system running 12psi of boost and you throw an intercooler or aftercooler on it your manifold pressures will drop. That 12 psi will be more like 8 psi. It's still pushing about the same amount of air; the air is just cooler now. So now you are making about the same power but your boost gauge shows 8 psi instead of 12.
As far as the comparisons between superchargers and turbos when not cooling the aircharge..it depends on the supercharger and turbo. A centrifugal supercharger is about the same as a turbo. A twin screw supercharger is much more efficient so the same amout of boost from a twin screw charger is more air than the same amount from a turbo or centrifugal. A roots blower is more efficient than most turbos below around 8 psi and less efficient above that. With turbos and centrifugals the efficiency varies widely depending on the matching of the turbo to the size of the engine as well. In practice it's pretty complicated.
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Originally Posted by Nomad
I was reading and wondered : Is 12psi super charge same power of 12psi turbo ? But , only turbo offers intercooled option ?
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