Very helpful observations - thanks for sharing them. I'm wondering if maybe they set them that way to prolong the life of the fan motors, or if maybe other fan speeds become available under different combinations of factors.Thru my Diablosport, I have noticed that the fans don't really come on
the low setting until about 44% fan command..
The fans aren't really "variable speed", just Low or High Speed
I have to "get into" my HP Tuners and learn it so I can turn the
Fan Command % numbers UP at highway speeds.
They don't really go over 25% even at 210* at speed.. At low speeds,
they start on low speed at 202* and will go up to 90% with AC on
or if temp goes over 212*.
Kinda dumb system IMO.. Why not just OFF/LOW/HIGH like many
of my other "fan command states"
I've noticed that while my coolant temp will get up as high as 230ºF on a hot day towing on the interstate, that it stays cool (below 215ºF) when climbing a long 7+% grade, even though I'm only doing maybe 35 by the time I reach the top. This, while my transmission temps climb through the roof. Makes me wonder if the fan speed will increase as vehicle speed decreases to compensate for loss of ram air.