Okay, I still haven't managed to measure the exact current drawn by my e-RAM, or the voltage drop in its wiring for that matter, but I have managed to contrive a pressure measurement. And it's putting out way less than advertised.
(Does anybody remember those simple little current meters which consist of a little compass needle on a spring, which would measure the current in battery cables and other heavy wiring just by being held next to it? I can't find one. Don't they still make them?)
I can estimate the current crudely. Running the e-RAM dropped the voltage at the battery terminal by 0.5v, and turning on the headlights dropped it by 0.4v on low beams and 0.55v on high beams. So, the thingy draws less current than the high beams do. I think my bulbs are stock, or close enough, and the Haynes manual gives both high and low beam wattage as 55 per bulb. This leads me to conclude that the e-RAM is drawing more than 110 watts and less than 220. That would be maybe 15 amperes. Given that it's advertised to draw 700 watts or 50 amperes, this is not good.
Now, air pressure. I hooked up a ten foot length of clear vinyl tubing to the valve cover vent attachment nipple on the CTA intake, and made a U-bend in it with water inside. I could then measure the difference in level between the two tubes, which is proportional to the air pressure difference.
I tried it with the engine off, with the engine idling, and with the engine revved to 3000-4000 in neutral. (I had no way to try this while under load, or at any really wide throttle.) The off measurement was 7.5 inches, idle was 9.3 inches, and revved up was a little less, maybe 9.0 inches. I think there was about 0.3 inches of vacuum when revved with the e-RAM off, so I'll go with the figure of 9.3 inches. That makes about 0.35 pounds per square inch, barely more than a third of what was advertised!
I've seen one other guy complain that his e-RAM drew only 15 amps and produced far less than advertised pressure. It looks to me like the company once sold a good fan, and then -- perhaps when the product changed ownership a year or two ago -- they substituted a cheap inferior fan without changing the advertising claims.
Now we'll see if their guarantee is any good.
