I do not have any dyno number increase. Most cars we have been involved in would run full timing advance under full load. One user reported using 87 octane with a small pulley. He only got knock at thrttole tansistion then timing would come come back to the full advanced position.
Some cars running pulleys that would show 16psi on the gauge would drop boost to 13psi when the correct amount of water was injected. The boost drop was not a loose in air flow just a large decrese in intake manifold temperature. Like leaving your water bottle in the car on a hot afternoon and coming out in the morning and finding it collapsed.
The supercharger on GTP are basicly a positive desplacement pump so the air flow is the same just the temperature is dropped.
On turbo cars the turbo just keeps putting in more air to get boost to the preset limit.
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Brad
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