Originally Posted by mkd

Manual switch at a static speed -- when the switch is in "Low" position the current is determined by the pot in that hole at the top of the switch mount. I just tune it to what I think is an acceptable noise level and leave it.

I'd love to set it up to be variable based on temp but I couldn't find any suitable fans for use with a PWM fan controller. Another option might be to use one/two thermal switches (like this: https://www.omega.com/en-us/process-...TT-F3A-140R-WL) with some kind of window circuit to function like a traditional home thermostat. Without the window circuit part, and only one sensor, the fan would just bounce on an off at the sensor's limit... I'm sure some EE major could build such a circuit with a couple relays or something, but I couldn't figure out how to or find any such examples.

What would be really cool is if you couple write a script on the ECU to take factory temp sensor input and actuate a relay or a PWM output to control the fans... but I don't know if that is possible with any currently available ECUs (I'm still in PFC world -- maybe Haltech or Adaptronic can run custom scripts? I suppose you could hack one of the open source ECUs to do that @SpinningDorito but I'm not about to dive into open source ECU land just for this...)

Got any ideas? I'm all ears.

Originally Posted by arghx

Why not just use the stock fan wiring (with whatever modifications necessary to implement) as it is already 3 speed and temperature based?

Running the fan off a manual switch - now basically nobody else can ever drive the car without you wondering if they will overheat it or not. Yikes. Any system that relies on the driver to remember to do something or the motor gets damaged is too risky.

Originally Posted by mikejokich

Great job on the fan setup. I do use a PWM fan setup inside my Autoexe airbox. I use a 300 cfm PWM controlled water resistance rated fan that uses a fan controller from Linqenfelter and the same Triumph air sensor we use in the uim placed in the airbox. It changes the fan speed automatically based on the air temp entering the airbox and determined by you based on start temp and full speed temp settings using pots on the controller. This is sort of a double ram air type setup given that my Abflug bumper feeds rammed in air directly into the Autoexe airbox too with the fan assisting particularly when in traffic or sitting at a light.

You could use the same setup on the intercooler fan which I didn't think of at the time. I did my intercooler fan setup first. One thing you could add to your current switching system is a button in the center console to control your two speeds. What I did is add a second fog light toggle switch in the center dummy switch area of the center console. I use the switch to change a double pole relay that chooses between the two fan speeds. That way you can change the fan speeds on the fly while driving and don't need to go under the hood.
Mike

Originally Posted by mkd

What I'm potentially confused about is PWM fans. Don't the fans need to support the PWM input signal to regulate their speed? I couldn't find any PWM fans that were small enough to fit on the IC. Those 5.2" Spal's are direct DC with no PWM.