Quote:
Originally Posted by ayau
So in theory, if you install panels underneath the vehicle and speed up airflow, then the net result should be an increase in lift. However, if you have a rear diffuser, then that should reduce lift. Is this correct?
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Faster air is lower pressure.
What we want is the ability to transfer high pressure under the car to above.
What a diffuser does is speed up the air going under the car in the front, then slows the air down as it tapers up in the back, but in the back is a big low pressure section. So the pressure difference also 'pulls' the higher pressure under-car air to 'fill' the low pressure behind it. The reduction of high pressure under the car reduces lift, and the reduction of low pressure behind reduces drag.