What Spoiler Do for Car?

Like a wing, a spoiler redirects airflow up and away from the vehicle, but for a different reason. Where a high-performance car wants that downforce for better high-speed maneuverability, a spoiler redirects air away from the low-pressure pocket formed behind the vehicle.

What is the point of a spoiler on a car?

Spoilers are supposed to change airflow above, around and underneath vehicles to reduce wind resistance (or drag) or use the air to create more downforce and enable more grip at high speeds. They're designed to “spoil” the airflow to reduce its negative effects.

Do spoilers make cars go faster?

The faster the car goes, the more the rear end will try to lift off the ground. A good spoiler (or wing) reduces that up-lift. To summarize: Both wings and spoilers reduce up-lift at the tail of the vehicle, but use different mechanisms.