Best Option For Electric Dual Fan Controller

68RTX

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Have a 392 in a 69 Dodge Charger with dual electric fans. My current Derale controller is absolute junk... 2 of them failed, tech support guys give you different calibrating directions than the actual directions... ugh.

What type of controller are ya'll using to control your dual fans?
Thanks,
Tim
 

diesel_lv

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Most reliable, without getting fancy is a thermostatic switch such as used in BMWs. Each set to ground at a specific temp to turn on and break contact at a lower temp to turn off. Each one connected to a 50 amp waterproof relay with 10 gauge wiring. Nothing fancy and super dependable.
 

68RTX

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Most reliable, without getting fancy is a thermostatic switch such as used in BMWs. Each set to ground at a specific temp to turn on and break contact at a lower temp to turn off. Each one connected to a 50 amp waterproof relay with 10 gauge wiring. Nothing fancy and super dependable.
Thank you sir!
 

diesel_lv

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If you have a/c, you can run another relay from the a/c compressor to trigger the 2 fan relays. That's how mine is set up. A/C on, both fans on. A/C off, 1st fan on at 195, 2nd at 200. The switches come with a 20° spread. My suggestion is leave fans disconnected and drive car for 20-30 minutes at 60 or above. Using i/r heat gun check thermostat housing temp. That's where your engine will run normal. Then get a switch that turns fans on 10 degrees above that. That way you're not running the fans while you're on the highway. At least when the a/c is off.
 

68RTX

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If you have a/c, you can run another relay from the a/c compressor to trigger the 2 fan relays. That's how mine is set up. A/C on, both fans on. A/C off, 1st fan on at 195, 2nd at 200. The switches come with a 20° spread. My suggestion is leave fans disconnected and drive car for 20-30 minutes at 60 or above. Using i/r heat gun check thermostat housing temp. That's where your engine will run normal. Then get a switch that turns fans on 10 degrees above that. That way you're not running the fans while you're on the highway. At least when the a/c is off.
 

biomedtechguy

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In my wife's GTO, there is a new Dakota Digital VHX series gauge system, and we are using the DD programmable electric fan module, plus a 2nd relay (the module has a relay built in) so the current spike upon activation is split into 2 separate circuits. Also if one fan, relay, or circuit fails, the other is independent.
 

5.7 hemi

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The reason most fan controllers take a dump is the sudden spike in amps when they turn on.

Get a controller that is PWM, plus width modulated. They allow the fan to start out slow and ramp up to speed to cool the engine, then when the lower temp is reached they ramp down. Also some can be had that’ll run the fan(s) few 30 seconds or up to a minute or so after shutdown.
 

whyjay

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I use a Delta Current Controller for the radiator fans in my Jeep Rock Crawler. Works great.
 

Mike67

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Just curious when you say a 392 is it a gen2 or modern? If it's a modern you should be able to have your ecu control them I beleive.
I have a Spal PWM controller but I'm not road worthy yet so not sure of the reliability.
They also make mechanical stats that are pretty reliable but they are pretty ugly.
 

747mopar

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Hope mine doesn't croak! I'm running a Derale, so far so good, it's been in there for a couple years now. Can't remember the model but it kicks one on at a certain temp then the other along with turning one on when the A/C is running. I'll be keeping an eye on it.
 

5.7 hemi

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I like the Derale PWM controllers, never had a complaint from me about them.
 

CudaFish

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I use a pwm fan controller from a Mitsubishi, it has dual fans but I only used 1 side of it. The way it works is leave the pwm signal wire unhooked and use a relay to supply 12vdc to fan. My fan would spike to 26 amps and settle to 11 amps on a relay. with this module the fan ramps up to 11 amps not spikes. I got this info from this link. ( I know it's generic motors forum, but good info) Pull a Part was like $20 bucks.
https://ls1tech.com/forums/forced-i...-speed-pwm-fan-control-under-25-less-diy.html
 

biomedtechguy

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with this module the fan ramps up to 11 amps not spikes
And that's a big advantage of the setup and parts you are using.
I'm going to email Dakota Digital tech support and see if the PAC-2800BT electronic fan(s) control module also ramps up power. I would be EXTREMELY disappointed if it does not, especially since I have invested in one for each of the GTO and my Roadrunner.
 

CudaFish

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I also use a speed activated switch to turn the fan off at 35 mph. It's pretty cool to me as I use a hall effect gear tooth sensor picking up pulses off the front rotor wheel studs to feed a vss signal to the speed activated switch which has a pot to adjust the speed to output a -vdc to a relay which removes +vdc from mishmoto fan controller. I have about $200 bucks in this system I use. When I turn on A/C the fan comes on no matter the temp. but I can turn off the fan with this setup at any speed I want to.
It uses the speed activated switch, gear tooth hall effect sensor, 12vdc to 5 vdc converter, Mitsubishi pwn controller, 2 relays. It takes a minute to hook it up, but it works great. Just my $.02 FWIW.
 
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