These fancy supercars come with "launch control". A mechanism that will rev in a high range (charging the turbos) and then release the clutch with full torque. I wonder if that helps...
Yeah the results on a dyno won't match the actual torque on the wheels when launching. It would be interesting to see a graph of how that happens. Torque vs. Time and RPM vs. Time on a two y-axis graph for an actual launch (maybe you could put sensors on the axles)