Have you done any testing with the DTM using a power pulley? I've read some articles that say there isn't much loss to cooling efficiency and others that say there isn't much of a HP gain. My goal is actually neither. I just want my fan to turn at a different RPM to get rid of the the annoying harmonic I've had for the longest time. I don't remember if it was there from the start, but I have traced it back to the fan.
I went to the extent of using silicone inside the shroud to try to smooth out the rough transitions between the air deflectors and shroud. I also changed the fan position back to the factory 2mm specs. I just find it hard to believe that I have 2 bad fans that both create a noise that I have never heard on any of the Type 1 based vehicles I have owned. Help!
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