New Digital EFIE

[cmac0351]

There is a new EFIE design over at fuel-saver. http://www.fuelsaver-mpg.com/doc/digital_efie.html

I was hoping someone would be able to read the description and come up with a schematic that would do the job.

[Q-Hack!]

The digital design has been around for a while now. I don't have a schematic, but I did buy a digital EFIE from:

http://www.3rdbrakeflasher.com/index...e368d356d64cd8

Unfortunately, it would be difficult to reverse engineer it as it is using surface mount components. Even the main IC in this circuit is one I am not familiar with.

[cmac0351]

That EFIE is not the same as the one I linked to. Read the description, please.

[Q-Hack!]

Ah, I stand corrected... This is different. It uses more of a pulse width modulation technique rather than just adding voltage to the O2 sensor. That is unique and looks like a much better design. Now I am curious as to its schematic as well.

[Q-Hack!]

Yes but I wonder if this is the correct approach or not... To me it seems it will allow the end user too much leaning ability... leading to engine damage.

I thought the same thing at first, then I thought... What is different in safety to the engine than what we are doing with O2 extenders or other EFIE designs. If you go too far the idiot light comes on and we have to reset codes. As long as you have an EGT to monitor exhaust temps. One is only as safe as ones mental capacity.

[cmac0351]

I was hoping to just be able to build one for myself. I am not worried about over leaning. I could probably do that with the EFIE I have now. I am concerned about a piece of technology that seems like it would be more effective. I don't know enough to just build something that does what it does. I do know how to follow a schematic and build something from that. I was hoping that with all of the knowledgeable people this forum has, that someone would have the ability to replicate the idea.

[cmac0351]

It turns out that the EFIE in the D17 pdf works like this new digital one we have been discussing. It is not quite as advanced, but works in the same basic manner. You set a threshold, any incoming signal below it produces a 0 v output, and anything above it produces a 1.0 v. The lower you set the threshold, the more the ECU gets the 1.0 v or "rich" signal. So it is not a voltage adder at all.

I am going to build one of these and I will update everyone on how it works in my car. It may be a while though, because times are busy.

[Alden]

How about links to any digital EFIE design/schematics?

[Q-Hack!]

How about links to any digital EFIE design/schematics?

Well, the D17.pdf is probably the most common of the early designs. Though it looks like Patrick Kelly has been keeping it current.

http://www.free-energy-info.co.uk/D17.pdf

[cmac0351]

The D17 EFIE is the only one I know of freely available. The one drawback to this one is that you can only adjust the threshold by 50 millivolts at a time.

There is one for sale at http://www.fuelsaver-mpg.com/store/i...f39aade37b1d26

This one can be adjusted down to the millivolt. It was based on D17's idea, but uses a comparator instead of an LED driver. The seller of this product however does not provide open source information like so many other HHO people like Smack, Zero, and many on this forum.