Ok, the intercooler, the fans, and everything else you guys are talking about has 0 to do with why modern turbo's no longer need a turbo timer to let the oil cool, so as to not cook it within the bearing.
Modern turbos now use water cooling, along with oil cooling to keep the bearings and turbine cool. When you turn the engine off, the water continues to flow throughout to cool off the bearings which in turn keeps the oil from scorching and sticking, since it is no longer flowing. Old turbo's were mianly oil cooled, so letting it run a little while after a hard run, was to let the oil continue to do its job since it was the only way it cooled off.
So, there is no reason to use a turbo timer with a modern oil/water cooled turbine. Enjoy!