Launching the automatic ZL1 is done the old-fashioned way: through throttle manipulation. As Monte relayed, “The PTM mode doesn’t matter because it doesn’t have launch control. But, the trans should be in ‘M,’ which engages the Sport Shift pattern, including First-gear starts (with traction control turned all the way off). If you just leave it in ‘D’, the drive mode includes a Second-gear start for fuel economy. Good for the road, bad for e.t.’s.” Even though the trans is in “M,” the car will automatically shift its way down the quarter-mile unless you accidentally hit one of the flappy paddles on the steering wheel (bad idea).