There is no intercooling of the charge air via the water inlet on a turbo? Why would you even think that?
Water jackets on turbo help prevent the CHRA from getting too hot and coking the oil, plus they form a thermosyphon when you shut the car off by boiling the coolant in the water jacket of the turbo and continually drawing fresh coolant in via this boiling until it cools off.
No horsepower gains to speak of....
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