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The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 03-25-2017, 03:15 AM   #1
topher339
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M3 Electric Fan Conversion?

Alright, so the auxiliary electric fan on my M is rattling around. It's bad enough to cause noises in the cabin with the windows up. From what I can tell, the fan is still in one piece but there is play in the motor allowing it to wobble when in use. It needs replaced.

So the question is, could I just do the full mechanical to electric fan conversion and drop the auxiliary fan? It doesn't cost all that much more and I wouldn't have to worry about the 16 year old water pump going bad and causing my mechanical fan to grenade inside the engine bay. Thing is, I've read some DIYs that say the conversion is not advised for the M3 but they never say why. Is there any particular reason why it would be detrimental to run a single electric fan on the M3?

I do plan on the occasional track day with the car. I'm under the impression that a proper electric fan could only help. I could very well be wrong, though.

I've been looking at these. They're marketed for M3s.

https://www.ecstuning.com/b-mishimot...mwLRoCVerw_wcB

https://www.zionsvilleautosport.com/...d-with-16-fan/

https://www.zionsvilleautosport.com/...d-with-14-fan/

Not sure which among the bottom two would be better. Anyone have knowledge on the subject?
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Old 03-25-2017, 01:33 PM   #2
taylor192
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I deleted the aux and mechanical fans and am using the aux fan controller to run a Spal 30101516 fan that pulls 1600 cfm. I mounted it to the existing shroud.

This setup is good to about 30C (85F) in traffic and 35C (95F) on the highway. Luckily I live in a mild climate otherwise I'd be ripping it out to use a 2000+ cfm fan. Most fans that pull 2000+ cfm will require an offset mount and you'll lose a shroud.

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Old 03-25-2017, 02:46 PM   #3
topher339
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Sounds like it should be fine so long as I use the proper fan. Awesome.

How did you use the auxiliary fan controller on the spal? Was it plug and play, more or less?

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Old 03-25-2017, 03:47 PM   #4
taylor192
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If I had to do it again I would have bought the spal 30102049, ditched the stock shroud, and used the spal brackets to mount it offset. Total cost ~$100.

The wiring to the aux fan controller is easy, just ensure the fan is pulling not pushing, otherwise you have the wires backwards.

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Old 03-25-2017, 04:18 PM   #5
topher339
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Nice. It costs less than a new auxiliary fan. Think it would cool well enough for track use?
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Old 03-25-2017, 06:18 PM   #6
taylor192
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Lookup the cfm of the 3 options you've chosen, it should be more than all of them.

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Old 03-26-2017, 05:55 PM   #7
topher339
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Sure enough, it seems to blow the most air. Thanks a bunch for the info.
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