Zell

iTrader: (2)

Hey Guys,

I have noticed a few discussions on E fans have recently come up and i didn't want to hijack anyone elses thread so i thought i mite start my own, i currently have e fan setup with a aftermarket thermo switch (the probe thing) anyway with all this talk about them being crap i wanted to ask if its a simple job to hook it up to my Power FC and have that control it. The only reason i never did that is when i bought the fan it had on the instructions do not hook the ignition source to engine management system or damage will occur. After reading everything on the forums only the earth should be connect to the engine management system anyway.

I have attached a picture of the wiring diagram that came with the fan and have labeled where i think things should be hooked up. I want to have the Fan hooked to the battery so it can keep going after the is switched off to get rid of heat soak, now Power FC fan control pin out should be the same as on a FD which is 3D correct me if I'm wrong, i was planing to wire the fan's earth into my patch loom. By the way its a Jap Spec Series 5.

Am i on the right rack guys, any advice would be awesome.

Cheers

cloudzero

iTrader: (1)

if you are using the Banzai Racing adapter for the power FC to install in your 2nd gen then they have already provided you a switch to use the electric fan. There is a small green plug by the leading coil and it will provide the switching 12v to hook to a relay to run a fan. Its set to come on at 87c with a Banzai map but you can change it to anything you want with a datalogit.

arghx

iTrader: (3)

Take any thermoswitch out completely. There should be power and ground to the fan (assuming it's a single speed fan).

Run the +12V right to the battery with a fuse in-line. Use heavy gauge wire.

For the fan ground wire up the relay like this:

85 --> from the green connector (which is connected to the PFC fan trigger)
86 --> +12V. this can come from any constant or ignition switched source, it's just power to the relay coil. I think I got this from another pin on one of the diagnostic connectors
87 --> chassis ground. use heavy gauge wire
30 --> to fan - side, use heavy gauge wire
87a --> open

You can also use one of the big OEM 4 pin relays if you want to.



In the settings 3 tab of the Datalogit software there is this table. They are set to 87C in the Banzai basemap. What will happen is that the fan will actually come on at 86C and turn back off if water temps drop to 85C. That's just how it works. When the fan comes on the electrical load idle system will engage. Your ignition timing will advance and the PFC will use the idle and fuel cut speeds labeled "E/L"

You can tell if the fan trigger has been engaged by going to your etc. --> sensor/sw screen on the commander. The ELD indicator will be active (it will be a black dot) when the fan trigger is active. The fan will only come on if the key is in the ON position, because the ECU has to be powered up to provide the ground to the relay.

Here is Banzai's write-up: http://www.banzai-racing.com/efan_re...all_how-to.htm. They use the PFC trigger to control +12V to the fan, I suggested you use it to control ground to the fan. I don't think it really matters.
S5 connector for fan trigger:

Zell

iTrader: (2)

Thanks man, i will borrow my friends datalogit this weekend and test that plug, does the earth wire from the fan have to be heavy gauge or anything going to that plug?

Cheers

arghx

iTrader: (3)

the main ground wire to the fan should be the same gauge wire as the main power wire.

the two wires that trigger pins 85 and 86 of the relay don't have to be heavy gauge. they are only pulling a few milliamps of current to operate the magnetic coil in the relay.

dougiepants

thanks for the info

dougiepants

I have a spal fan and I have the 12v lead for the relay with the inline fuse from my power distribution block, the ground is going to a chassis ground, my ignition wire is hooked up under the dash but that is going to the 85 pin and the 86 pin is suppose to go to the sending unit. that sending unit wire is the wire that I would assume goes to this orange wire on the green connector right? Though that would mean that that orange wire on the green connector grounded by the pfc when it reaches the correct temp right?

rxse7en

Banzai's set-up works perfectly.

arghx

iTrader: (3)

I can't follow what you're saying here. try explaining/asking again. Or draw a diagram.

dougiepants

in this image is what spal says to hook up their fan. I have everything in the car hooked up and I just need to wire in the sending unit wire so it can work properly instead of having the fan on all the time by just grounding out the sending unit wire as i have done to test the setup. Do I just need to hook the sending unit wire into the orange wire on the green plug or is that orange wire in the green plug not proper wire? I only asking this because the sending unit wire is looking for a ground signal not a power signal. Also is that orange wire a ground or power wire? Since it is such a light gauge wire I'm curious and it was not originally planned for this purpose.

Thanks

arghx

iTrader: (3)

There shouldn't be a sending unit or other external temperature trigger unless you are running a more complicated 2 speed fan configuration or something. If you were planning on putting the sending unit to pin 85 or 86 on the relay, instead connect that pin to the green plug. Then your fan comes on at the temperature set in the Power FC. Your fan is controlled based on the water temperature signal from the factory 2 wire sensor on the back of the water pump housing. It is important that this sensor is still reading accurately. You may want to replace it with a new one from Mazda.

dougiepants

so all i have to do it connect that sending unit wire that is on pin 86 to the green plug wire correct? That would allow the pfc to control the fan correct?

dougiepants

Im just wanting to make sure since I have not gotten a datalogit so that i can set the fan output to test wiring.

arghx

iTrader: (3)

Yes. Warm the engine up and verify that the fan is turning on before you drive the car.

dougiepants

thanks so much