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
I am monitoring it's behavior with this :
Digital Fuel Mixture Display Kit for Cars
http://www.jaycar.com.au/productView...=&SUBCATID=347
It is connected as follows :
Here is a youtube of it in action :
EFIE Gizmo
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