Electric Cooling Fan CFM Rating Tests - DirtBound Offroad

[WebDog]

Webdog

Do you have any additional mods to your cooling system (pump, t-stat, t-stat housing?)

I have a CSF 3 core, stock Autozone $31 pump, stock t-stat, and HO housing for the sensor hole.

The only other thing I can think of that makes my highway temps so low is the fact that I don't have a air conditioning condenser in front of it.

I also have a heavy duty trans cooler and bypass the radiator.

 

[sleestack]

On this three fan kit, it is possible to connect one fan to the ac/pcm and then connect the 180 degree power to the same fan using a diode? This way I get the 180 with one fan and 205 with the two fans, but if I turn on the ac/defrost the fan for it comes on. Basically I'm asking if the diode would prevent power from going into the pcm when the ac is off and the 180 fan is on. Also would there be any problems if the 1st fan is getting power from ac/pcm and 180 degree controller simotaniously.

 

[WaXJ_Skier]

On this three fan kit, it is possible to connect one fan to the ac/pcm and then connect the 180 degree power to the same fan using a diode? This way I get the 180 with one fan and 205 with the two fans, but if I turn on the ac/defrost the fan for it comes on. Basically I'm asking if the diode would prevent power from going into the pcm when the ac is off and the 180 fan is on. Also would there be any problems if the 1st fan is getting power from ac/pcm and 180 degree controller simotaniously.

There are a few threads about adding a manual switch to the stock fan and still having the relay work. So you could use the same sort of setup with this. Really you can do whatever you want, it just depends on how much effort you want to put into it and if the effort to reward ratio is worth it to you :thumbup:

 

[fyrfytr1717]

Here's my write up on how to manually override the PCM fan control without triggering a CEL. Not sure what year your Jeep is, but this write up is intended for 97+ models. Should be even easier with pre 97's, but I don't have the FSM wiring diagrams for the early models so I'm not much help in that arena. It will obviously require some adaptation with the 3 fan set-up, but if you're familiar with how diodes work, I'll assume you have enough electrical know-how to tweak my wiring diagrams for your needs.

http://www.naxja.org/forum/showthread.php?t=1025399

 

[sleestack]

I have a 96. I looked at your wiring diagram but its way too complex for a dummy like me.

 

[John D]

I finally got around to building my shroud and installing these fans. I am impressed by the amount of air that is pulled thru the grill. Driving around yesterday 92* and the temp never went more than a couple degrees above my thermostat which is 186*. Thanks guys for a good product.

 

[comanche91]

I'd like to give Max Wilson (WebDog) kudos for the CFM and load tests performed on the 3 x 10" fan setup vs. the 2 x 12" 1997+ stock e-fan setup. The CFM flow between the two systems seems to be the same as well as total amperage draw. Although I suspect the 2 x 12" setup would have better real world total CFM flow because of what looks to be a more efficient shroud design. I've been running the 2 x 12" 1997+ stock e-fan setup using a SPAL PCM controller for several years now and never had any problems. Although WebDog's setup looks like the best e-fan setup out there now, I see no reason to change what I have.

 

[John D]

I'd like to give Max Wilson (WebDog) kudos for the CFM and load tests performed on the 3 x 10" fan setup vs. the 2 x 12" 1997+ stock e-fan setup.

X2 - This was the selling point for me. There are a few 3 fan setups out there and I was going to buy one of them. The CFM test numbers made the choice easy for me.

 

[bulfo4]

Does anybody have the wiring diagram this is supposed to come with? I've emailed and called and not gotten any communication. I waiting three weeks for it to ship after they charged me and had to harass the heck out of them to get any response. Anybody have a writeup for installing it?

Thanks

 

[Milford Cubicle II]

Little Rock Arkansas. 100F is common. Most of the summer it's hot enough that I'm running the a/c when driving to work at 6am. When your going 40 or more you don't need a fan. I do expect that just the 1 fan would give me problems on a trail ride, probably even in the winter. Like I said, I'm planing to add another.

I've been running with just the stock electric fan since about halfway through the summer. The fan stays on in traffic in 100 degree weather but still never gets above 210. But at speed it never comes on and stays around 190. That's with a Champion 3-core and a stant 180 t-stat.

 

[hidperf]

Just curious, I read the entire thread but didn't see any numbers posted on the early non-S blade factory fans. Any idea what kind of CFM they pull?

I have heard they move more air than the S blades but the S blades are quieter.

 

[Chin13]

Does anybody have the wiring diagram this is supposed to come with? I've emailed and called and not gotten any communication. I waiting three weeks for it to ship after they charged me and had to harass the heck out of them to get any response. Anybody have a writeup for installing it?

Thanks

I would be interested in this also. I have mine sitting in the garage waiting for some time to install it but it would be nice to see exactly how to do it. Thanks.

 

[John D]

Black - Ground
Yellow - Relay Feed
Blue - Fan Feed
White - Switch/Trigger

 

[ericfx1984]

it would be neat to see someone attach the stock mechanical fan to an electric motor(to simulate the engine) and test it and different RPMs to figure out how many CFMs the mechanical fan pulls at idle all the way through redline

 

[crash02]

I found some numbers on a jeep forum about the mechanical fans cfms at idle and at x,xxx rpms. I will see if I can find them. I know I wrote down the numbers somewhere.

 

[crash02]

http://www.jeepsunlimited.com/forums/showthread.php?t=8504
the guy was saying
700 rpms(idle) about 650cfms
2000 rpms(clutch locked) about 1860cfms

It would be nice to have some solid numbers,and not just "about" numbers.

 

[cherokeefan_1]

Does anybody know if the aftermarket oem style fans are anygood. Like the dorman one's or from ebay with the curved blades? Every one I get from the junk yard gives up the ghost after a short while and I'm tired of spending money on used parts that fail in 3 months. Thanks for any info.:eeks1:

 

[whatevah]

Never used the Dorman one you find in the stores, it doesn't have as many blades as the late-model fans. It's basically a copy of the older fan. They used to make a copy of the newer S-blade fan, but it's been "superseded" in the parts computers. I've used the one from Quadratec but it's thicker than a stock fan and rubs on my power steering pulley (worked fine before I smacked into a PT Cruiser). I believe that the Dorman fan is thicker, too.

Fwiw, I think you can buy a replacement fan motor.

 

[cherokeefan_1]

Any clue as to where to find a replacment motor for the newer style fans? Thanks in advance.atriot:

 

[whatevah]

the usual suppliers should be able to get it. Just checked rockauto and it's a bit more expensive than I remembered, around $95. Ebay probably has them cheaper. I'm not sure of the exact fitment, but the part rockauto shows for a 2000 XJ is the same as the one they show for a 96 model. So, the motors might be the same? However, they do show another part from a different supplier for the 96 model, so I dunno if the fitment is exact or just another case of "supersedes". Maybe you could start a new thread for fan motor sizes and get some input from the guys with the older models.