Do all narrowband O2 sensors output the same voltage (afr vs. output volts) I've found most all narrowband sensors output .45 volts being equal to 14.7 afr. Is this true for all narrowband sensors? Does anyone have a chart of voltages vs. afr that a narrowband sensor outputs? what i really need is a good accurate chart! Thanks!

 

yes, for all intensive purposes they put out the same voltage. roughly 0-1v

but it isn't a constant signal, it's a sinusoidal output voltage. typically the amplitude of the wave determines rich or lean. hooking a dc voltmeter to this will read random or nothing or maybe the .45 you're getting. a hand-held ac meter may work. but it's frequency is likely going to be off. a desktop unit that can just read peak values will do the trick.

they only read about 15-14:1 air:fuel. making it impossible to tune with a narrowband sensor.

skim over this:
http://www.autodiagnosticsandpublish...or-testing.htm

it's a lot of extra info for you, but it'll give you a good base knowledge of what you're dealing with. and you're on the right track!
good question

 

Right, i am not using it to tune the car. its so my ecu stays happy via altered o2 input at the ecu. Any idea what the voltage outputs are for the 14.1 thru 15 afr range?

 

Also i am using a oscilloscope to read voltages. I just really need something to gage what afr the ecu is receiving from the 02 sensor.

 

oh crap. right, my bad. used to newbs around here.

afaik it's a linear thing.. and due to manufacturer and environmental variances it can't be too terribly picky.. a few mV would be 14:1, .9V will be 15:1

what ecu are you trying to trick? most obd1 and less hondas are pretty easily confused. a steady .45v at whatever hz would probably do it. anything besides idle and low throttle and it's likely in open loop anyway.

what is the purpose here?? like, why are you trying to fool it?

 

Im using the stock o2 sensor and altering its output to keep the ecu happy because ive done a fuel system upgrade to accommodate a turbo app. I will want the fuel system to run rich during boost and do this while in closed loop (when applicable). I also am running e85 also now and went from 240cc injectors to 1000cc injectors bumped up fuel pressure and flow at the rail. Now i don't want the ecu leaning out my tune so i must keep it satisfied that everything is running smooth. On a odb1 Honda short term fuel trims are not able to be monitored but if the o2 signal and logic ground are intercepted now fuel trims can be read with this info i am looking for.p14 ecu, auto trans, h23a1 dohc engine

 

i have some great ideas but must run

might want to ask in the engine management and tuning section. or check pgmfi.org

nice to see someone thinking, even if i can't imagine why it's necessary with all the hardware and software available these days.

i'll check back

 

0v = approx. 15:1
1v = approx. 14:1

 

I still would like if anyone knows a actual data chart of a narrow band O2 sensors voltage output and its corresponding afr. There seems to be this question asked alot but no clear answers for it., just 0=15:1 1=14:1. Ok i know the voltages will be close thru out this range, but i just to know for sake of knowing what the ecu is receiving from stock sensor. What is the afr between 0-1v?

 

omg...

 

starting to feel like this is a less than noble attempt at rigging up a blue box type piggy back...

 

The output is a normal DC voltage, nothing special. It's just not a linear output, it's SHAPE on a graph is one of a sine wave.


I google'd "narrowband output" and this was on page 1 for pictures:

 

Sorry my fault i should have been more informative on what i needed. I need a table of the exact narrow band output vs the afr. I need the digits not a graph. 10 points or so should be enough to work with. Thanks for all the help and yes this is a attempt to finally get a aem fic to operate correctly. And so far it looks to be going very well. I actually found some tuning tricks that make it much easier. I get these voltages ill let everyone know how i did it and its kinda easily also. The car is holding 13.6 afr. The voltage table will complete the install and make the fic semi user friendly. Although this hookup is semi complex. My alternative hookup that is and requires a oscilloscope for starting out the tune.

 

why not run neptune, hondata, or even chrome? seems like you've got enough tied up in this build to warrant not risking it.

 

I understand this I just really want to get it running on the fic. I know a lot of people have had no success with it, but maybe I can help them, I know I can do it, my car is almost there except for a little bit of configuration and its even user friendly now (if you actually understand what it is doing)...... I guess the bottom line is I'm wanted to do it because everyone says not too. Most likely when I complete tuning this I will swap the p14 for a auto p06 and hondata. But now I know my way around a fuel injected engine like I never thought. I had no idea before this "what was REALLY goin on". I am stubborn I agree but in my mind this has helped me so very much. I live in a small rural town that no one REALLY knows anything in depth about the programed fuel injection system. Honda-tech is my main source of this help and if I can get someone else with a aem fic up and running like me, the knowledge I've gained, I think everyone who considers themselves a tuner should have to tune at least one of these things. So just like the Smiley beating himself in the head with a hammer, I bet he can't tune a aem fic to run even remotely correct like mine. And just to say without a few people on here tossing in some info and ideas I might still be doing some trial and error. Thanks to everyone who helped with this build, I greatly appreciate it.

 

good luck man

most people don't have good luck with those things.. well, because they just aren't any good.

 

:t hud:
THIS IS A DAME GOOD THREAD! SUPER IN-DEPTH! I consider myself a NEWB reading this post! It sounds to me your doing something not many people have done and your doing it just to do it. I ADMIRE your stubbornness! Being a Marine I completely understand the BULL in the china shop mentality!
Always consider though, some things are not meant to be altered which is why others have become rich off creating other / better applications such as Chrome, Neptune or Hondata.

GREAT POST! Just wanted to drop
#0.02

 

I've had good luck with my LC-1. Having a programmable output comes in handy.

 

What is the lc-1?

 

Thanks RITLINBOY for the props! Makes it all worth while knowing it is appreciated! Gives a sense of accomplishment. Anyone who needs help with a fic please just pm me and i would be happy to try to help. Configuration should be finished next week and a vid on YouTube following.