Thanks guys. The diffuser might be taller than it should. 5 degrees of upsweep is the max for drag reduction, I believe?
Maybe I’ll do what’s already been done and try an adjustable cooling inlet, thanks for the info.
The deflector before the windshield likely is in a separation bubble, I’ll probably just leave it. I’ve noticed rain doesn’t go near that part of the windshield, so I’ll bet you’re right.
I made the mistake of drawing the rear windshield too tall and too steep. Here’s an actual side template of the car:
I think there’s attached flow down the rear windshield, even if it’s poor. A very shallow notchback. Rain tends to flow down the rear windshield in a straight path. I can tuft test the car’s body and see for myself once it’s up and running again. Essentially, I want do everything I can to keep the rear windshield clear of obstructions and looking good while getting good airflow down it. The C-pillar area is indeed a problem.
In the front wheel-well, I’ve drawn the aft edge to be sweeping inward. I plan to do this in both wheel wells, as I’ll be making the rear skirt removable for the winter. Have you done this on your truck, Aerohead? It looks like you have.