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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-13-2015, 04:05 PM   #1
Lee Reynolds
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Cooling Fan Override

Hi guys.

This is my first post so be gentle!

I'm currently building a track car using a 325ti as a Base. This isn't my first rodeo, I've built a few track cars in my time, but mostly from 80's rot boxes with simple wiring.

In the past if I wanted to bypass the temp sensor it was a case of bridging the wires from it together which would bring the fan on. Simples.

It seems the e46 has a ferkin complicated way of going about cooling down a radiator. Either everyone on the Internets has never done this on a 46 or it can't actually be done. (I don't want to bypass the cars existing system with the switch off, I need the cooling system to behave normally unless I flip it).

I've tried unplugging the temp sensor as one of my many googlings suggested this, but the fan is still not playing ball.

Thanks in advance for any suggestions, this forum has been so helpful to me over the last few years I've never had to post..... until now lol
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Old 09-13-2015, 05:43 PM   #2
Rob43
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If you can't get it figured out, install a second low profile fan like the Spal #30100400 / #30100401 that you control manually from the cockpit. Just make sure it's flowing the same way as your stock OE fan so that they're Not fighting each other.

http://store.bimmerworld.com/spal-el...ans-p1160.aspx



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Old 09-13-2015, 05:46 PM   #3
Lee Reynolds
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Thanks Rob. That was going to be my last resort but it's looking like it's my only one!
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Old 09-13-2015, 05:50 PM   #4
heineken016
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Seems like its just resistance based, rig up a switch with an appropriate amount of resistance on the alternate circuit?



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Old 09-13-2015, 11:42 PM   #5
daniel_f.
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Originally Posted by Lee Reynolds View Post
Thanks Rob. That was going to be my last resort but it's looking like it's my only one!
Why not just simply use our software bundle and tweak the thermostat setpoints?
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Old 09-13-2015, 11:59 PM   #6
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Sorry for off topic, but daniel_f you are the man. Been following the ms43 thread
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Old 09-14-2015, 07:09 AM   #7
Davew
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E46 thermo is PWM conrolled, with daniel f's suggestion, there is scalar in his xdf that allows you to turn off the fan at the dme, I can confirm that this works. I am running a spal fan, thermostat, and two relays (one with a resistor) for low/high speed.

Last edited by Davew; 09-14-2015 at 07:11 AM.
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