Trial and error has proven to inject water after the intercooler. Let the intercooler do what it can and finish it with water. You could spray wate on the intecooler.
If you are going to spray before the intercooler the air will become over saturated with water.
For autocross you might consider bypassing the intercooler and run only water with a little less boost. The spoolup time will be much quicker and the engine will react more like a natually asperated car. This will allow you to throttle steer the car more effectivly.
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Brad
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