When the 3,2,1 count begins, accelerate as much as possible and you will reach the max in your gauge. When the 1 appears, take you hand off the accelerator and the gauge's needle will change color. Then repress the accelerator and in that moment the 3,2,1 count ends. This happens only if done correctly; otherwise you will start later than the others.

You will unlock the Toyota Supra, along with the Nissan Skyline at 42% Career Percentage completion.