How to Boost on Forza

Hold the right trigger on your controller to accelerate.

Drive until you come to a curve in the track.

Lightly pump the left trigger, half-releasing the right trigger. When drifting properly, the right trigger should only be held halfway down, and you should repeatedly press, or pump, the left trigger, but only halfway as well. The car will drift, or slide sideways around the curve.

Release the left trigger and fully hold down the right trigger when you finish drifting past the curve. The car will boost forward slightly before resuming normal speed.