The air coming out of my turbo is 275° and I try and cool it with 40° water in the intercooler system - to end up with 90° air at the end of a pass. If I started with 200° water I would probably only see the IAT drop from 275° down to 250° since the intercooler cannot chill the air 100% to it's own temperature.

I don't think engine-temp water will cool the charge air at all.