Well, this is the whole problem with MAP based systems. If you increase the mass of air moving into the engine without retuning for it, engine go boom. The extreme example is the stock twins @ 15psi vs a GT60 @ 15psi. 15psi is not 15psi and you need to be careful especially with a MAP based system. It the WI pre-turbo is really changing the mass of air entering the engine by way of cooler charge temps, then as you state here,
Quote:
Originally Posted by RICE RACING
This is brought about by a charge increase into the engine (more air and more fuel over and above anything that the water may displace).
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than I wouldn't think that slapping a WI system on is going to be safe. However, if boost levels are kept constant, the mass isn't going to change dramatically, the water is displacing some of the mass, and the cooler charge temps are being properly compensated, the difference is minimal. I just feel that to say zero re-tune is needed is a little sketchy is all.
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