I personally would
not want to be going WOT/full boost until the coolant is at least 180*F, and the oil is the same or even over that temp.
And yes, I know that can be very difficult to
ever get to when stuck in 10*F (or BELOW that, BRRR!) ambient temps, especially with an aftermarket radiator, aftermarket oil cooler, and a 180* thermostat (I don't know if you have any of those or not
).