[hotrod]

If you look at it from a simple thermal point of view, a given amount of WI following the IC should be better than (ie give more charge air cooling) than the same amount of injection ahead of the IC.

The analogy always used is if the spray cools the compressor discharge below the temp of the intercooler, the intercooler then acts as an "inter-heater"

I don't believe it is quite that straight forward and you should consider the option of trying both.

Everyone thinks in terms of the WI only effecting the engine but your dealing with a system that has several components. It may in your hot climate be worth while to give the intercooler a slight head start by partially cooling the compressor discharge under high boost conditions prior to the TMIC and see if the system "likes" the change.

What I would be inclined to do, is spray at both points, triggering the pre-throttle body sprayer first at your normal turn on ( ie 8 psi or what ever) and then try and see what happens if you trigger a smaller spray ahead of the intercooler under severe operating conditions like 12 + psi or where ever your turbo begins to rapidly loose effeciency.

If the air discharge from the turbo is 400 deg F a very small amount of water will knock it down to 200 deg or so, which the IC can take down near ambient with much less heat soak of the intercooler. This would also significantly change the flow velocity through the intercooler core, and I would think, reduce the high velocity "air flow drag" pressure drop due to the intercooler.

I plan to try that sort of arraingement when I get to that point.
Give it a try, you may discover something good!

Larry