Anyone removed clutch fan and replaced with electric?

[crystalworks]

It's like talking to a wall.

And FWIW... I have never replaced an Aux fan on any of my BMW's (10+ of them). My longest in service has near 400,000 miles on it. Electric fans are quite reliable but like anything else... there are some that fail earlier than others. I've seen bad fan clutches too.

Also... having seen the effects of the mechanical fan's propensity to destroy the radiator (among other things) after a water pump bearing failure or a belt failure, trust me it's nice to not have to worry about that. And you're right about the water pump not pumping in either of those cases... but at least you are still forcing air over the head with the electric fans.

You are happy with your cooling solution, and it's perfectly fine... no one is saying it's not. Leave us to our own devices. I have dyno evidence of HP gains on one of my vehicles and that is more than sufficient for me. BTW there is air being forced into the radiator during a dyno... they use giant swamp coolers in front of the car to ensure proper cooling. I think you mentioned something about no air flow during dynos making the result invalid, or at least inconclusive.