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Originally Posted by Dave
That's exactly how crate engine controller will work with the pressure sensor in AC system and PWM fan control. Will modulate fan output only enough to control pressure. This is how Jackass, Red Devil, Mayhem and Camaro XV are set up.
I hate listening to a car and all you hear is the fan screaming.
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Exactly! We've got an analog input (ECT goes from 180 to 181, or refrigerant goes from 175 to 176), but a binary response: the fan goes from 0 to full speed.
How about this question: do Jackass, Red Devil, Mayhem, and XV use a trinary (or binary) switch? Let the ECM manage the fan, but the fail-safe requirement when the refrigerant gets dangerously high is still allocated to the binary/trinary switch?