Actually I think that the benefit is about the same. 6hp for fan, 6hp for inertia of the clutch. Inertia is always forgotten, that's why I mentioned it, the fan was obvious.

 

Well you are assuming that the fan speed increases on an axis of engine RPM which is incorrect. At high rpms/acclerating rpms the fan clutch slips. it can only steal soo much power. It hits its happy speed and does not increase from there, the friction of the air and the clutch slip modulates this, and depending on the temperature of hte fan clutch determins the 'happy' speed of the fan.



That formula someone mentioned assumes 100% efficiency which is incorrect. The loss from mechanical energy to electrical energy ive see was around 62%, (just an average of the values ive seen, depending on the conversion from ac to dc and the quality of the parts used)

Anyways I would still be interested in a dyno with fan on/fan off run. I am in teh market for a elec fan so obviously I am a believer in it (especially since i replaced my fan clutch on my stang for an sn95 setup (elec fan))

Be interesting!
Brandon