Ok so with the AWD system when inputs to the PCM are correct it sends a signal to the AWD module to command( pulse with modulation ) the Active Torque Coupling which brings in power to the rear end. How fast does this happen once the PCM sees the front wheels slipping (say at a launch at the drag strip) and sends signals for the AWD module to bring in the rear unit. With this being said if at the drag strip and you are able to command on the ATC to 100% which enguages the rear end right off the get go should you be able reduce what front tire spin you do get and launch harder. Just food for thought.