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  #21  
Old 11-26-2018, 12:49 PM
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Update- Replaced the variable controller that sets the coolant temp the fan engages. This is the second one I have fried. This time it shorted out and completely drained the battery. I had to recondition the battery to get it to charge properly.

In defense of the controller, I have always had it set so it comes on just before the stock electric fan so it is running most of the time.
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  #22  
Old 11-26-2018, 01:45 PM
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Thanks for the update! My goal is to build my own controller and maybe focus on running the existing aux fan with a strategy similar to what the X3 uses. I might add a second fan for redundancy. No time though, so just running without mechanical fan in the winter for now.
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  #23  
Old 11-26-2018, 02:03 PM
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A decent electric fan will produce more CFM than you will ever need. Other than sitting in traffic in a Texas summer the stock aux fan will be sufficient cooling if the aftermarket fan goes out. I wouldn't worry about needing redundancy.
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  #24  
Old 11-26-2018, 03:10 PM
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That's good to hear By redundancy I meant a backup to the factory aux fan not a second aftermarket one. I was a bit worried because the aux fan does eventually give out, but I have replaced mine not that long ago so maybe overkill. That being said, I can't remember for sure but I don't think I ever replaced the electric fan in my wife's X3, I should probably look into that before summer or maybe keep an eye out for a cyber week deal!
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  #25  
Old 06-07-2019, 02:09 PM
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Great write up! The original thread was fun, too

I want to do this, if anything just to get rid of the noisy mechanical fan.
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  #26  
Old 06-07-2019, 06:33 PM
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Quote:
Originally Posted by burninator View Post
Great write up! The original thread was fun, too

I want to do this, if anything just to get rid of the noisy mechanical fan.
Prefacing with the electric fan I chose has far more CFM output, it is loud. Not a bad sound or something I can hear except when I am out of the vehicle.
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  #27  
Old 06-07-2019, 10:10 PM
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Quote:
Originally Posted by bcredliner View Post
Prefacing with the electric fan I chose has far more CFM output, it is loud. Not a bad sound or something I can hear except when I am out of the vehicle.
I had a high output puller on my turbo Integra Type R. To state frankly, the electric fan will be around the same db or LOUDER than an OEM fan. The fan I had pulled a lot of CFM through an all aluminum racing radiator so the sound level was very noticeable.

Also, I had a secondary manual override on/off switch in the event the temp switch failed.
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  #28  
Old 06-08-2019, 03:40 PM
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Quote:
Originally Posted by X5M-ISH View Post
I had a high output puller on my turbo Integra Type R. To state frankly, the electric fan will be around the same db or LOUDER than an OEM fan. The fan I had pulled a lot of CFM through an all aluminum racing radiator so the sound level was very noticeable.

Also, I had a secondary manual override on/off switch in the event the temp switch failed.
Have no idea what CFM or noise level of a fan for an Integra but fan I have is noticeably louder than stock X5 4.6 mechanical fan at idle. I don't care about the noise, features and benefits of an electric fan far out weigh even if I had any concern about the noise. Never found any specs on mechanical fan output and would be related to engine RPM rather than an electric fan that is at peak or off. I used SPAL usage specs for a 600-800HP engine.

Fan has been in place several years now without any issues other than replacing two controllers, have never needed an on/off switch. I have it wired to run after the engine is off and key removed to prevent heat soak. In the Texas summers it cycles two or three times for less than a minute. With the dial temp controller I can set it to come at at various temperatures. Other than when I know I will be using nitrous I have it set to come on just before the stock electric fan engages. For me the decision to go to an electric fan was primarily to get back the engine performance the clutch fan uses.
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Last edited by bcredliner; 06-08-2019 at 03:59 PM.
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  #29  
Old 06-08-2019, 05:53 PM
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I’m 99% certain I had used a Fluidyne slimline fan rated around 3,000 cfm. That car was dyno’ed at 507 whp at 17 lbs of boost using a T3/T67 ball bearing turbo with a massive intercooler. I completely get where you’re coming from with your switch to electric. However, I personally think that the parasitic drag caused by the OEM fan is marginal. Though, if the OEM fan on my truck starts making any noise, I’ll likely go your route simply for the sake of ease of installation as the price is negligible between the two.
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  #30  
Old 06-08-2019, 07:03 PM
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Lots of discussions about realistic gains from electric fans.I've been replacing clutch fans with fans that take less to turn for decades. I have also replaced stock pulleys with under drive pulleys for the same reason. Never failed to be beneficial. Easily passes my cost/benefits criteria for a good value purchase and a no brainer if replacing the stock fan. What do you consider marginal?
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