Thanks, Troy. In my doddering near-senility, it's amazing how fresh a thread seems on a reread, even though it's only 9 months old. The portayal of Subi vs. a/c seems to be somewhat exaggerated to me. Like comparing a 1960's motor drive Hasselblad camera to a current off-the-shelf point and shoot model.
The argument is more nuanced than that. The common enemy we all face is engine heat. You would think that the solution would be pretty standard by now. But it really isn't, is it? We still have threads in which we can't agree on whether air is entering or exiting the engine compartment from deck lid louvers.
I still can't get my EJ255 turbo to cool properly. It's mid engine mounted, with a radiator and inter cooler in the left rear wheel well. It's pretty simple to get a n/a model to run cooler, but, when you add the turbo, engine waste heat soars. From an engineering viewpoint, 1/3 of engine HP goes to make power, 1/3 goes out the exhaust, and 1/3 is lost to cooling. That means when we up the HP ante, stock cooling can't do what it needs to do.
My engine is detuned to put out 207 wheel HP. Until I get the cooling straightened out, that's the maximum HP for a safe operation, since boost is limited to about 4 lbs. It's a fun challenge to determine where the actual installation design fault is, and then, what is the best method of correcting it. In my case, NACA ducting may channel more air to the rad and inter cooler, but, after heat soak, a more effecient rad with enclosed fans will likely be needed. High volume water pumps, wetter water, silicone hoses, cross flow rads, the list goes on and on. More expensive and advanced fixes will include fender vents like the modern water-cooled 911's. Line in the sand: I am not building a wind tunnel. Weeeell, not unless I can disguise it as something else I REALLY need.
Most of us, like me, are not the best wrenchers in the world. We don't have mechanical engineering degrees. But, like it or not, we're the front line. Our fumbling attempts are inefficient, when compared to a pro like Jake, but somehow, we muddle through. More HP = more headaches. That's o.k, with me, I've got lots of aspirin in the medicine cabinet.