cooling stated that the optimum time to spray was prior to boosting because the IC acts as a heatsink which typically cannot be cooled sufficiently while being heated but instead cools off after the boost event. The colder it is when you start to boost the more heat energy it can absorb. The better it cools after boost, the faster it is ready for the next event.
I think this is important when considering things like ducting but also shows why people with no ducting or poor ducting still see improvements. Especially on a dyno if there is enough time for the heat sink to cool between runs.
Of course in street use the ducting/venting ensures the IC is at it's coolest when boost begins.The initial dip may also be from the initial inrush of colder air as the turbo spools up before the compression has increased enough to heat the air.
KKROFFTNow occurs everywhere, simultaneously. But it doesn't have to be experienced the moment it happens. Every now that ever was is still exactly when it was, when it was now.
Then, in terms of perception, is nothing more than all the nows that are no longer now. Thus, the difference between now and then is when. --The Waystoppers Users' Manual 
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