Tim -
Sorry to confuse you with the numbers! Just trying to do a reality check.
In a nutshell, if you are moving some quantity of air, you need some amount of fuel to go with it (which gives you the air/fuel ratio).
That amount of air and fuel should make some amount of horsepower.
The amount of hp you get out of that air/fuel mixture is the BSFC, brake specific fuel consumption. In other words, how many lbs of fuel does it take to make 1 hp?
You think you are moving ~510 gm/s of air, if the extender chip/translator is working as it should. That amount of air, with the right amount of fuel, should make between 480 and 675 hp, depending on the BSFC (or lets call it the efficiency) of your engine.
If you have an inefficienct engine (really rich, wrong timing, bad heads, lotsa things could be the problem) then you'd be at the lower end of the scale, BSFC ~ 0.7, and about 480 hp.
If your engine is pretty efficient, right a/f ratio, right timing, all the stars are lined up, etc..., then the BSFC ~ 0.5, and you would be at the high end of the scale, maybe 675 hp.
Or you could be somewhere in between (most likely). That's where my guesstimate of 550-650 hp came from.
It's just a reality check, to see if you are making a reasonable amount of power (and getting the appropriate mph) from the air you think you are moving through the engine.
It just seemed to me that if you really are moving that much air then you should be making more power than you are, unless your engine isn't doing it's best for some reason. Or the other possibility is that the air measurement is wrong, which would lead us to a problem with the translator or extender chip.
I'm leaning toward the measurement being wrong, because I think it is tough to move that much air through a 231 cid engine at 20 psi boost. Not saying it's impossible, but to do it you've got to either being revving the engine higher than typical (over 6 grand I'd guess), it happens to be really cold out and you've got a great intercooler, and the volumetric efficiency of your engine is really awesome (great heads and cam and low exhaust backpressure). Or all of the above together. Again, not impossible, just unlikely.
That help?
John