Turn it off for sure. I also recommend that you go to the drag racing forums and read the sticky`s on top of the page. There is some great information there.I'm planning on heading to the local track in the next few weeks, to get some baseline numbers on my Shelby GT. Previously, I've raced my old Subaru WRX which is not an easy feat with AWD. I just wanted to ask what rpm should I launch at and also how much of a difference does it make to turn off the TCS?