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Originally Posted by norbert24
actually, no disrespect but I am pretty sure this was discussed already earlier in the thread.
The whole point of a diffuser is to essentially feed the air through a bunch of funnels in reverse. This way the high pressure air under the car gets fed through the channels, in between the fins, and the fins spread apart and the pressure of the air decreases, allowing a much smoother transition to the rear of the car where all of the negative pressure is.
It cleans up the wake of the car and reduces drag.
I am just hoping someone can help me figure out at which angles to set those fins at.
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The fins can be parallel - as the 7 degree diverging angle of the 'ceiling' of the diffuser is what creates the low pressure.
The fins themselves can be angled if you wish, but again 7 degrees should be the maximum angle. Any greater and the air flow is likely to become detached from the fins which will cause turbulence and loss of downforce.
The angled inner fins seen in pictures are usually to tidy up the flow round the gearbox, which commonly intrudes into diffuser space. Outer fins are usually parallel and without a wind tunnel to see what is going on with the airflow if you angle them I would stick with parallel to be sure of not introducing some undesirable turbulence.