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February 19, 2015

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Downforce

How your Diffuser works

Diffusers are essentially a raised area at the back of a car. Down-force is created when air moves quicker under the car than over it, this is why your Lotus has a flat underside and uses aluminum under trays etc. This causes the air trapped between the car and the ground to move rapidly to the rear. The diffuser section in the rear causes negative pressure at the back of the car because it has a bigger volume than the area that the air flowing into it is coming from. This negative pressure accelerates the air under the car which puts the whole underside of the car under negative air pressure. This creates a vacuum effect under the car which sucks it into the ground and creates down-force.