OK we can agree that for any wing/spoiler, the optimal angle, etc. will vary depending on a multitude of variables. But I think that's besides the point. You're talking about using a wing outside of its normal range of angle of attack.
Basically, you're suggesting a third version of a downforce-creating airfoil - one which does not operate as either a wing or a spoiler. Whether it's 25* or 45*, it is in "stall" because it is outside of the range in which is can operate as an airfoil.
Mainly what I had a problem with was in post #12 where you claimed that the proven effects of a spoiler somehow translate into proof that a wing at a steep angle will provide positive effects - which makes no sense if you understand how a spoiler creates downforce, which is what prompted my "wall of text".
Now, if you're suggesting that a steeply-angled wing creates downforce in a way unlike an airfoil and unlike a spoiler, then that at least is a possibility worth discussing.
So, let's discuss that possibility:
You've still not offered any reason that your suggested wing angle would work.
The equation you posted is correct, but that does more to suggest that you are wrong about a steep wing being beneficial than right.
1) As you stated, CL depends on the angle of attack - but what does that mean if you have a steep wing? Answer: CL drops off towards zero as the angle of attack gets steeper outside of the wing's normal working range. Therefore L falls off towards zero. This means no lift (no downforce)
2) This is an equation for how much lift a wing produces when operating like a wing
. It actually doesn't even apply to a stalling wing. CL is too low (nearly zero).
You claim arbitrarily that a greddy'd miata can overcome the drag caused by a steep wing. Sure, the car can still get down the straight away, but by some measure slower - drag is a big deal - and the fact that the miata already has a high coefficient of drag is not an excuse to unnecessarily add more drag - in fact I argue it's a better reason to try to minimize drag as much as possible. If L is falling off towards zero with a higher angle of attack, you're getting less downforce from your wing, and you're creating more drag.
Originally Posted by BenR
I based this on actual experience seeing various ebay wings at the track, they often don't mount to the miata trunk with a high enough angle of attack.
This sounds like you're saying that you see other cars at the track using eBay wings, and in your opinion, they are not mounted steep enough. This isn't proof of anything other than that you have a theory that a steep wing would work, which is exactly what I disagree with.
I think, instead of me explaining why a wing does not work like an airfoil when it's too steep and why a steep wing does not create the same effect as a spoiler, we should approach this from a different angle:
Please explain why exactly you think a wing that is in stall will create downforce - and enough of it to justify the unavoidable drag that such a wing will create.