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PWM Fan Control
#1

I saw somewhere that the MS3 has PWM output to control the radiator fan.

Anyone here using an ECU PWM to drive any substantial fan, the radiator or interior heater fan?
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#2

You don't drive the fan with the ECU's pwm output directly.  You use either a solid state relay, or get a fan and controller off something like a newer volvo or crown victoria.  The ECU's PWM outputs are good for 2 amps tops.
86 Mazda RX7, 2.3 swap, t5, MS3 sequential, BW EFR 6758
"If you can't dazzle them with knowledge, baffle them with bull sh*t"
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#3

Good point.

In fairness that is why I said "control" rather than drive, but in a forum it shouldn't be left unsaid.

Right now I have a set of relays that reverse the signal from the LA3 to do a dual speed control of the radiator fan.

It would be easier, in my mind, to simply use a PWM signal and PDM (or just a driver) to do a variable control of the fan. Then it could gradually speed up as needed to overcome a temperature differential or A/C line pressure issue. It could also power down at speed and let the wind velocity do the work.

But other than programming a speeduino to do this, I don't know if the PiMP knows how to do this trick or can be taught it.

Either way, thanks for the reply.
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