[plucas]

Originally Posted by jamal

Well, you want to make the area of flow separation behind the car as small as possible and do what you can to draw air out from under the car. So if you have a diffuser, it will create a low pressure area under the car. If you have a wing or spoiler down low off the trunk deck there will be a low pressure area below it which will help draw air out from the diffuser and create more downforce just from the underbody plus reduce drag. A smoother transition from the diffuser to that low pressure area would probably be helpful.

But, like I said, it just *looks* like it would work well.

Originally Posted by jamal

Because of wing-body interaction. A wing that helps draw air out of the diffuser can make more total downforce with less drag than a just having a diffuser and a wing mounted up high working independently.

This is all true