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Electric cooling fans - Two pullers or One pusher?


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#61 flatcat19

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Posted 09 November 2017 - 08:01 PM

What are you doing for your fan controller?

You can't hang if your nuts haven't dropped...it's physics


#62 Draker

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Posted 09 November 2017 - 08:35 PM

What are you doing for your fan controller?


I just bought a thermostat switch and relay. Switch is on at 185, off at 175. Probably a little low, but should be okay. I'll wire in a fan LED in the cabin to know when they kick on.
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#63 Draker

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Posted 09 November 2017 - 08:36 PM

It was pretty cheap on amazon.
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#64 Draker

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Posted 09 November 2017 - 08:43 PM

20171109_192744.jpg
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#65 flatcat19

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Posted 09 November 2017 - 09:54 PM

I just bought a thermostat switch and relay. Switch is on at 185, off at 175. Probably a little low, but should be okay. I'll wire in a fan LED in the cabin to know when they kick on.



Thread in probe? Or the o e you stuff through the fins?

I ask because I'm looking in to doing e-fan(s). Just gathering who's doing what, where.

You can't hang if your nuts haven't dropped...it's physics


#66 Draker

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Posted 09 November 2017 - 10:17 PM

Thread in probe? Or the o e you stuff through the fins?
I ask because I'm looking in to doing e-fan(s). Just gathering who's doing what, where.


Thread in, but not sure where I'm going to put it yet since I'm a already running two gauges. There is another spot on the koyo.. maybe it will go there.
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#67 Lockleaf

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Posted 09 November 2017 - 11:02 PM

I did two fans hooked to a dual temp bmw switch. It turns on one fan at low (190 degrees) and turns on a second fan if it reaches high temp (210). Also the second fan is tied to my AC wiring so the second fan will run full time whenever the AC is on.

Thread in switch in radiator. Pulled from a bmw. Junkyard fuse/relay block. Two small Honda fans that may not be adequate to the job.

That's in my "half pint" 510 wagon thread.

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Audrey ('69 Roadster 1600) http://community.rat...rey-the-ratster

 

Tiny Havok ('85 720 DIY built Crewcab 4x4) http://community.rat...ache/?p=1395455

 

720 Shenanigans http://community.rat...20-shenanigans/


#68 datzenmike

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Posted 10 November 2017 - 06:07 AM

dq_10.1_fan_switch_photo1.jpg

 

I have similar to this one from a '90s 200sx. It goes in the return hose just cut out 3" and two hose clamps. Run this through a relay and 30 amp fuse. It should be powered at all times and NOT through the ignition.

 

Don't put in the inlet hose. Give the rad a chance to do it's job first or the fan will be on when not needed.


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#69 Stoffregen Motorsports

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Posted 10 November 2017 - 10:57 AM

I recently found a great writeup on fan controllers. It's got links to other pages which also had a ton of other info - http://www.240turbo....oolingFans.html

 

His 4 speed fan controller is a work f genius and a lot of testing, a bit bulky though - http://www.240turbo....fanharness.html



#70 distributorguy

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Posted 18 November 2017 - 06:20 AM

I've never used a fan controller that didn't let me down.  I've gone to thermostatic switches in the head.  Much simpler and more effective long term.  On at 180, off at 170 or something like that.  

https://www.ebay.com...h-/262564045727



#71 Stoffregen Motorsports

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Posted 19 November 2017 - 09:10 AM

Me too. I've only had fan control failures. My Volvo V70 T5 had a massive electronic controller that went out and instead of spending the money I tried a cheapie from Hayden (I think) and it could barely handle the amp draw of the OEM Volvo fans. So my solution (though not pretty) was a pair of Ford continous duty solenoids. It worked, but was ugly.

 

The reason I like the info in the links I shared above is because it seems that guy has had similar problems and has worked hard to figure them out.



#72 datzenmike

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Posted 19 November 2017 - 09:48 AM

Odd, I have a pair of Subaru fans and 20 amp fuse between a 720 Nissan relay and + battery. I put spare fuses and an extra relay in the glove box when I read you saying about this huge draw on start up before. It works just fine with the 20 amp. 


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#73 Stoffregen Motorsports

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Posted 19 November 2017 - 11:46 AM

There are a few fans on the market these days that pull very high amperage. The fans in my V70 had 50 amps of draw on startup.



#74 datzenmike

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Posted 19 November 2017 - 12:51 PM

On initial start up of an electric motor it's basically an almost dead short. Current will spike but drop off quickly as it revs up. This is why electric cars have torrid take off torque. The start up is rapid enough on mine it hasn't time to blow the fuse or harm the relay. (well so far)

 

 

I don't know what the Nissan relays of the '80s and '90s could handle. They're quite robust. 


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#75 distributorguy

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Posted 30 November 2017 - 05:51 AM

Spal makes relays that can handle a 50 Amp spike.  They're the only ones I have seen that require a jumbo spade terminal - bigger than the hard to find extra large ones.  



#76 Stoffregen Motorsports

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Posted 01 December 2017 - 12:21 PM

I was sad to see SPAL stop production of their super fan controller, the one that had soft start, built in timer, multiple fan capability, etc. I spoke with a rep of theirs at SEMA and he said they just had too many problems with it.

 

That's what I want. Something that can handle all of those functions.



#77 distributorguy

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Posted 04 December 2017 - 01:02 PM

FiTech EFI does a good job controlling dual fans, independently.  Not many "cheap" controllers can do that.  They can't handle the Amp load.  



#78 G-Duax

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Posted 04 December 2017 - 02:02 PM

A stand alone ECU is kind of out of the question for many Datsun owners.

I run a separate 30a relay for each of my fans on the 620, and 80 amp relays on my Cressida.

Never a problem....

When using a fancy, multi-function fan controller, I always just use them just to turn on & off secondary relays.

Very little amp draw to turn on another relay, and if something fails, and over loads the system, such as a fan failure, the secondary relay takes the abuse.

The controller never takes the death blow.


"All of a sudden it started making noise, then started losing power. I limped the car home and tried to get it up the driveway, the engine just died."

 

Why do people do this?

A $100 tow bill is never as much as the extra damage you cause by trying to "limp the car home".

 

Don't be that person !


#79 Stoffregen Motorsports

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Posted 07 December 2017 - 07:31 AM

A stand alone ECU is kind of out of the question for many Datsun owners.

I run a separate 30a relay for each of my fans on the 620, and 80 amp relays on my Cressida.

Never a problem....

When using a fancy, multi-function fan controller, I always just use them just to turn on & off secondary relays.

Very little amp draw to turn on another relay, and if something fails, and over loads the system, such as a fan failure, the secondary relay takes the abuse.

The controller never takes the death blow.

I wouldn't see a problem with that. Did you see the links to the fan wiring I posted earlier? Did you do something like that?



#80 G-Duax

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Posted 07 December 2017 - 09:46 AM

Yup.


"All of a sudden it started making noise, then started losing power. I limped the car home and tried to get it up the driveway, the engine just died."

 

Why do people do this?

A $100 tow bill is never as much as the extra damage you cause by trying to "limp the car home".

 

Don't be that person !