I'm just starting to get into the tuning aspect of the hondas and am learning how to use hondata and all of its features. So i've been playing around with the ROM Editor software and noticed that there is an option for when running closed loop for you to set the voltage you want the ecu to try to attain from the O2 sensor. The problem with the wideband O2 is that the voltage goes from 0 to 5 instead of 0 to 1 and also the slope of the voltage is inverse from the normal O2 (ie Rich is 0 volts with the wideband whereas rich is 1 volt on the normal sensor). So what if you were to take an Op-Amp and make a subtractor circuit to subtract the Wideband O2 voltage from a 5V constant supply which would reverse the slope of the line. Is the ecu capable of being told to try to attain 2.35 V or will it only accept a voltage less than 1V???

Just a thought.

Also... does anyone know the voltage range that the air temperature sensor puts out and the air temperatures corresponding to the voltages?

Thanks

 

Why would you want to run the same air-fuel ratio through the entire map?

To answer your second question, the IAT sensor is a 0-5V sensor.

I think this graph is from the stock sensor, I'll double check tomorrow though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daveG &raquo;</TD></TR><TR><TD CLASS="quote">Why would you want to run the same air-fuel ratio through the entire map? </TD></TR></TABLE>

See i'm not sure... this is why i was asking. I thought the main reason people wouldn't run with widebands is because our ecu wasn't compatible, which is why they also have the narrowband output. So you're saying that you will want to run richer in spots and leaner in others and not just aim for stoic?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daveG &raquo;</TD></TR><TR><TD CLASS="quote">To answer your second question, the IAT sensor is a 0-5V sensor.

I think this graph is from the stock sensor, I'll double check tomorrow though.
</TD></TR></TABLE>

Awesome graph on the ait sensor too, i couldn't have asked for a better reponse there. Although i was kind of hoping it was linear... guess i could approximate it.

 

actually, if you have that chart and the data could you do a regression to get a line of best fit? If you don't have the data i'll just pull it off the chart and do it. Thanks again