I'm going to put a set of e-fans back in my truck, but I hate the voltage drop associated with turning the fans on high with the a/c. Has anyone seen any kind of soft start motor controller for a 12v electrical system? I want something that will slowly ramp up voltage to the fans so I can avoid the jolt.

 

You could possibly put a big capacitor used in car stereos to elimate the voltage spikes/drops. Similar fix to the same type of problem..

 

I thought about that, but I don't want one mounted under the hood and I don't want to run e-fan power wires into the cabin.

 

I've been doing some reading online, and I wonder if I could come up with some kind of circuit that uses a startup resistor and a relay that takes several amps of current to charge and close to make sort of a 2-stage startup controller. Anyone good with electronics that can help me out with something like that?


How does a set of factory e-fans work like that? They don't jolt the electrical system when they turn on.

 

Ooh I might have found something

http://www.dccontrol.com/

*edit*
Here's an interesting thread over at tech
https://ls1tech.com/forums/showthrea...art+controller

 

interesting. can any of the GM service guys get their hands(or hard drive) on a schematic of the stock e-fan setup?

 

i know the controller that comes with flex-a-lites has the soft turn on feature...but i dont trust the controller. it was a POS IMO

 

I've heard a lot of bad things about the FAL VSC's....not an option for me.

Thats DCControl system is standalone, looks like it might be a good deal. I would need to figure out how the stock 05+ e-fans are controlled though, it's a 3 wire plug.

 

I believe the stock fans have a delay built in to allow the fans to stagger start. This way of operating does not hit the electrical system like 2 fans starting up at the same time. The settings in EFI Live have a field for a delay. But the 05 fans are controled by 2 pin in the PCM instead of just 1. 03+ pcm is needed. At least that is what I have researched.