The Secret is...
After Initiation of the brakes and you get the timer. Press the pedal again and press OK, you will feel the pedal vibrate, take your foot off of the brake and hit the gas pedal and drop the clutch.
OK I tried to use the drag mode on my 2018 GT350 and could not get it to work. Is there a detailed instruction sheet? Oil temp was 190deg. Every thing I though I was ready... I was at the drag strip.
And while I am asking is there a detailed description of each mode?