Today the Silver S4 went back to the Dyno for a series of pulls with some hardware configuration changes. Data from that is still under evaluation.
Because I was changing some hardware configurations I removed the front bumper and headlights for the morning. This allowed me a clear view of the intercoolers, or more correctly the thermal camera a clear view of the intercooler.
I snapped these images during one pull, the left image is from the early part of the pull and the right image is from the last part of the pull as the dyno operator lets off the accelerator.
As makes sense, the lower part of intercooler, where the charge air enters the core, is rising in temperature more rapidly than the upper part of the core, where the cooled air exits.