| so fast and the boost range is pretty small where the spray would be on ( 8psi - 16psi as an example ) and on top of that most z guys are not running different timing maps ~ tuning is not necessary. You need a top notch expensive water injection system to run a tune just for water injection which allows for a fail safe when the injection is not on. The safest thing to do and cheapest is to run about 3psi extra boost with the spray. That will give you about 30 rwhp extra.
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