Nik,
Thanks mate. I am installing OpenFlower atm to have a play with that. Anyone have an accurate 3d 240Z model handy?
Understand stagnation points, check. Understand NACA ducts, check.
Re cowl hood, I reckon it looks pretty cool actually. But it wouldn't be an issue to NACA duct the guard right into the turbo inlet. Only issue is that I will be looking at modifying the guard with the vents for wheel well pressure we were talking about.
Wheel well exits for engine bay pressure definitely sound like the go. Then need to figure out best way to duct the air out nicely out of the wheel well, maybe just a curve section going from the strut tower to the guard area behind the wheel, can work that out. Also, adding air here will delay boundary layer separation caused by the front guard tapering in back to the stock width of the zed at the doors. Maybe considering that some vents in the guard will be the go so its not just exiting at one height.
Re rear wing/spoilers. The spoiler in that pic, according to what I have read, could actually work well. Spoilers can both increase downforce AND reduce drag, due to the improvement in underbody flow that comes with massive reductions in rear wake/turbulence. See Competition Car Downforce book for evidence (I don't have a scanner).
I'm not too sure what you are referring to with the tear top/boat tail rear end? I understand why/how a teardrop has a very low Cd, but I'm not sure what you're referring to in this context?
Now I'm off to try and play with this CFD software.
Dave
_________________
USA Daily:
2014 Nissan GT-R, very minor modifications for the track
USA Project:
1978 280Z, minor suspension upgrades, VK56DE conversion in progress.
SOLD
AUS Race Car:
1973 240Z, L28ET, Autronic, GT35R.
SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild.
SOLD