In my experience a TMIC in cold ambient conditions is awesome, minimal lag and not too bad intercooling efficiency but the words "cold ambient conditions" are the operative words here.

As soon as the outside air heats up efficiency starts to drop away rapidly and then the engine once hot will begin to transfer heat to the TMIC because as we know hot air rises and with the TMIC sitting right on top of the engine and right next to the turbo it doesn't take too many red traffic lights for the TMIC to turn itself into an "interheater".

This is why a waterspray system has a fairly decent effect on a TMIC but on an FMIC which is usually at least twice the size of a TMIC and located in a far better location with virtually no heat soak well I think any gains to be had from a waterspray would be largely psychological.