Is the electrical fan conversion any good?

[jondee86]

I don't think it is as complicated as that The Fan Laws state that the
absorbed power is proportional to the cube of the speed. If we assume
that the stock fan absorbs 100 Watts @ 1000 rpm, then @ 5000 rpm it
will absorb 12.5 kW.

These figures are simply to illustrate the point. I have no idea how much
slip there is in the viscous coupling, so cannot say if it runs even close to
the pulley speed under load. Nor do I know how much air it shifts. What
I do know is that a small bathroom extract fan will absorb 60 - 100 Watts
against negligible resistance.

So, as I said earlier, to me it is quite plausible that the engine driven
fan can absorb the level of power demonstrated on the dyno test.
Electrically driven cooling fans only need to shift air when the car is stuck
in traffic. At other times the movement of the car will provide sufficient
airflow thru the radiator.

The engine driven fan responds to the leaving air temperature from the
radiator. In low airspeed, high load situations (such as on a dyno), it will
be working hard.

Cheers... jondee86