My Eagle Research EFIE
 

Hello -

This is something I said I would post in this thread :

Any one seen these DIY gauges?
http://ecomodder.com/forum/showpost....5&postcount=13

I have had this gizmo online since August 8, 2007. It's not always on. I try to use it in situations where my (ScanGauge) TPS is below 20 :

Electronic Fuel Injection Enhancer (EFIE) Device
http://www.eagle-research.com/store/...products_id=16

http://ecomodder.com/forum/member-cf...earch-efie.jpg

I am monitoring it's behavior with this :

Digital Fuel Mixture Display Kit for Cars
http://www.jaycar.com.au/productView...=&SUBCATID=347
http://ecomodder.com/forum/member-cf...-afr-gauge.jpg

It is connected as follows :

http://ecomodder.com/forum/member-cf...figuration.jpg

Here is a youtube of it in action :

EFIE Gizmo
http://www.youtube.com/watch?v=hKWG40hzSeU

In the above video, the EFIE setting is "mild" when it is on. I am trying to add a small fuel trim that still allows for moderate acceleration.

Here is my interpretation of what I am seeing with the EFIE. When the EFIE is on, the A/F ratio creeps up to 14.7 + deltaT. The deltaT is a function of how high I set the EFIE. But, I also have a second post-cat 02 sensor that is used to manage emissions. Because the second 02 sensor is telling the ECU/PCM that the car exhaust is running lean, I think the ECU/PCM tries to resolve the difference by jumping back to 14.7, and then creeping up again. Therefore, I think the result of the EFIE is that instead of floating close around a "narrow ratio" of :

14.7 +- .2

It is now floating around the deltaT with a much wider span :

(14.7+deltaT) +- deltaT

What this means for my EFIE is that I still go back to 14.7, but I spend alot of time "floating up" above 14.7 before going back down.

Notes :

- Since the ScanGauge does not use the short/long term fuel trims, I don't think it is registering the effect.

- I don't like the teeny-tiny screw. It would be nicer if it had something I could tap into. If the screw was on the opposite side, at least it would be easier to package with a hole for inserting a small screwdriver.

- It's output-bias-voltage is temperature sensitive. I wouldn't mind this, except for the fact that I didn't find out until after I bought it. That detail should be on the website. I currently have a CPU heatsink attached to it.

- I have toyed with the idea of a "no load" option. If I tap into the TPS signal, I can make it so that it will only be on when the TPS is zero, and off when I accelerate. That way, the engine would simulate "diesel going lean" under idle/no load conditions.


CarloSW2

What is TPS?

Throttle position sensor.

What do you plan on using in addition to the EFIE? Just leaning out the mix will cause a increase in NOx emissions.

To solve the 2ndary O2 sensor you'd need another EFIE hooked up to it to get a consistant leaned out mixture. Maybe you could use the one EFIE to send out signal for both O2 sensors?

There are wideband solutions that do the same thing. Innovate has a simple setup (you need a laptop) for $200, and Zeitronix has one for just a bit more (230-240ish) than that with some very nice datalogging capabilities. Then, you also get the benefit of exactly monitoring your air/fuel ratio once it has left the narrowband sensor's operating range.

Daox~

Thanks

Daox -

I should have gone with a wideband fuel controller form the beginning, but I was a newbie and now I am invested in a lot of "nibbling around the edge" solutions, :o .

I originally got the EFIE to supplement my hydrogen generator. Right now I am going to leave the second 02 sensor alone.

Here is my current state of affairs with my emissions. This is with a HAI (Hot Air Intake) intake installed :

California Smog Test : 08-15-2007
http://img249.imageshack.us/img249/6...number2kw1.jpg

My car passed with great numbers for HC and CO pollution (below the average :D !), but the NO went up. I think the HAI is creating a (mild) lean-burn effect. I would guess that my IAT (Input Air Temperature) was 120+ degrees F.

The hydrogen generator is off-line right now. I never saw an MPG gain from it, but I never installed the whole "system" as instructed. The manual calls for modifying the MAP and 02 sensors with potentiometers. I wasn't comfortable to do this at the time, but now I have the EFIE installed. Here is my master plan for world domination, ;) :

Hydrogen Generator +
External temp sensor glued to outside of Hydrogen Generator +
EFIE +
NOx sensor (at a later date)

The idea would be :

1 - Go lean with the EFIE
2 - Use the output of the hydrogen generator to lower NOx

I don't think I can prove any of this without a real-time NOx sensor, so maybe it's all pie in the sky. But I still want to try.

The NOx sensors are "in the works" for clean diesel applications :

My Kingdom for a NOx Sensor
http://ecomodder.com/forum/showthread.php?t=316

CarloSW2

Carlos,

I have heard that if one has two oxy. sensors that the single efie should be connected post-cat. Having two means that there is a reading before and after the catlist has done its job. I'm not quite sure why there would be two. Maybe it is to improve emisons. I'm working on a DUAL EFIE with higher grade conponents that are more sound under your bonet.

uberhho -

I agree that having an EFIE for every 02 sensor would make the behavior more "normal". I definitely think the second 02 measures the efficiency of the cat *and* the health of the cat (I think they are the same thing). Because of the cat-health issue, I am leery of installing a second EFIE.

I don't think that a single EFIE configuration should be connected to the second 02 sensor because I can *see* the 14.7 ratio with the digital A/F gauge. The second 02 sensor is operating in a different range because I can compare readings when I datalog :

http://ecomodder.com/forum/showthrea...ging-1781.html

Also, it goes against the logic of what I have read regarding closed-loop operation. What I have read tells me that the *first* 02 sensor is used to determine fuel injection at the stoichiometric ratio of 14.7 to 1.

CarloSW2

You would probably only need one EFIE on the first sensor and just an extender for the second.

Thats what I will do in the future,

let it only turn on under 24tps (for my particular car, that is pretty much cruising with little load) and make it go into lean mode... how lean? I will find out when it starts knocking :D

BTW, for your air/fuel thing, do you still need to add a separate wideband oxygen sensor or does it simply tap into the exisiting one?

basslover911 -

The eagle-research gizmo is designed for narrow-band (0 to 1 volt). I *think* it can be modified to work with wide-band (0 to 5 volt), but I don't remember the website where I read this.

CarloSW2

tasdrouille -

I think you mean using one EFIE gizmo to return information to the ECU/PCM. If yes, then based on my observation of the data, I tend to disagree. When I datalog a stock 02 sensor configuration, I can *see* that the second 02 sensor is reporting different oxygen levels after the cat. This makes sense (to me) because there has been a chemical reaction in the cat that has consumed some of the oxygen (right?!?!?!). I know that the oxygen atoms are still there, but I think that when they are combined to make different (non-harmful emission?) molecules, the 02 sensor doesn't see it. Hrrrrmmmm, maybe that's why they call it an 02 sensor, because it only "sees" the 02 molecule. That never occurred to me.

Does this make sense? Can someone chime in to lay down the skinny?

CarloSW2

If you are getting the magic 14.7:1 then I would see no need to do any more trick f&*$ing my friend. Now my question is are you seeing any improvements, if not why?

If you find more information on this it would really help everyone. Does wide-band o2 sensors. I would imagine the schematic to call for different values of components.

uberhho -

I have stopped using it because I want to make sure that I comply with emissions (hence my desire for an affordable NOx sensor in post #5).

In terms of improvement, I have theorized that the SG does not use the 02 sensor output for calculating MPG. Now that you ask, I think that proving this would be a job for the MPGuino.

CarloSW2

I say when it comes to emissions, take your cat out and sell it for scrap. Use that money to make more systems. Hand it to the man guys. All the EPA is doing is making money off of the masses and we are giving them less business with browns gas. That's why they don't want anyone altering emmision systems, but we have to with HHO. So give it to the man and get HHO in your auto. :thumbup::rolleyes:

whats wrong with NOx ?

is it definatly created during lean burn or is there some lee-way?

modmonster -

NOx is bad :

Facts on NOx Reduction
http://www.arvinmeritor.com/media_room/pdfs/gp0440.pdf
(Same source as above)
If you "go lean" of the stoichiometric ratio of 14.7 to 1, the good news is that your HC and CO emissions stay nice and low. The bad news is that your NOx emissions increase :

Automotive Electronics Handbook - Google Book Search
http://ecomodder.com/forum/member-cf...-emissions.jpg

This is a conundrum of diesel engines, which "go lean" by design.

CarloSW2

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