Opinions on PWM fan controllers

[andrewb70]

Originally Posted by Larry R

I wasn't trying to be obtuse, I did read that you do not have A/C. But since you mentioned the compressor was controlled by the VA computer, I was hoping you had some knowledge of that.

I have been studying this and I can see how to incorporate the PWM with the fans and my Holley HP, but not the A/C. One way I came up with to speed up the fans when the A/C comes on, is to use have the signal from the trinary switch go to a relay to shift the power to the fans from the PWM to a constant 12 volts for the duration of the higher pressure seen by the trinary switch. I would rather have it all go through the PWM but I don't believe I have enough I/O's with my HP to do this. Again, thanks for your input. Larry

Toward the end of my Cougar build thread, I discuss how to configure the Holley software to have two PWM tables one for AC on and one for AC off. This way you can have the fans come on when the compressor is on.

http://www.pro-touring.com/threads/1...res-and-videos)

Andrew