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Thank you.

No wing, the picture was just of the top to show that the airflow would likely still be attached. However I did find a picture of a car with my top and wing if it helps: http://www.aprperformance.com/images/zoom/PGQAUR/viewsize/AB-922000_0008.jpg My intention is not to generate lift on the...

I should probably add some pictures to give some background on my car. The wing most definitely gets significant airflow. It's an APR GTC-300 wing mounted about 16" off the trunk lid. I also have the hardtop below so the airflow probably stays attached for the most part. As for the flat bottom...

It's currently 7*

I wouldn't really say "the same way" since a flat plate cannot generate lift at 0* AOA like a true "wing" can. Either way it's irrelevant to the thread, and RB1957 brought up the deflector vs wing issue. I was just trying to clarify what type of wing I had if it was relevant.

I also know that a rear diffuser can aid the function of the wing and allow a higher AOA without stall which is why I wonder if extending it past the rear bumper would lessen the benefit of the whole system. BTW is there an edit button somewhere I can't find?

In the case of NASCAR or other similar series where the is no real "wing" and instead just a piece of sheet metal stuck on the truck at an angle you're correct about the "deflector" comment. However in any series that allows it true airfoil wings are used, which is the case on my car and they do...

The biggest one I could see being interference with the function of the trunk mounted wing. At some point I could see it being possible that the diffuser was actually holding the air down. I'm really hoping someone can provide a definitive answer. Or has seen it done in CFD, or a wind tunnel.

My first question is really the biggest though, is there any advantage/disadvantage to a diffuser extending beyond the body work.

Well even if that were all there was to my second question it doesn't answer my first at all. There are major differences between street cars and the F1 example, the biggest being that there is virtually no flat vertical area (rear bumper, trunk lid tail lights etc). It is possible that the...

Assuming the rules allow for it is there any advantage in extending the diffuser beyond the rear bumper? My initial thought was "the bigger the better" but I am now thinking that is not the case. My second question is about the diffuser exit. Almost all diffusers for sale for street cars (that...