Most recent idea from dinner above. This is the pair of front diffuser ideas i have both very similar. The main difference between Idea 1 and Idea 2 is that idea 2 samples more of the air in the front and pushes it over the bottom of the spoiler. This increased surface area should make more stick and effectively more pull down, or it will simply blow air out the side and lose lamination way before the straight on approach of the air in Idea 1. So if anyone can chime in on that. Also I asked my brother and he thinks that the low pressure air under the pan will suck out the high pressure engine compartment air if a 5-8" gap is made right before the firewall. Any larger a gap would create excessive turbulance and reduce the suction/flow.
Those are just a couple ideas for now, next tuesday my brother is going to help me put this all into Lightwave and we are going to run tests on sections of the datsun with windspeed (from the car moving) as a factor, that way we can find the optimum angle for the diffusers at a given speed. Also we will be able to calculate downforce and see where the airstream is going (via particles). So that should step this up a notch expect an update.