O2 Wideband Readings Question

GSRRR · Post by **GSRRR** » Fri Jun 26, 2009 9:37 am

Hi,

I was just curious about the wideband O2 readings in Hondata. It fluctuates rapidly and really hard to read, compared to the AEM EUGO guage I am using. Yeah, I've heard that these are not recommended, but I got it in a package deal.

My question is..... how do I get both of the readings to read exactly the same if the Hondata readings are jumping up and down so rapidly? I know that we need to set the offset so that it matches..... but the Hondata O2 reading doesn't stay constant so it's very hard to read. Is there a trick to this?

Post by **Spunkster** » Fri Jun 26, 2009 9:51 am

Changing the offset does not change how fast it reads. The AEM does not display the actual changes...it is buffering and smoothing things out so you aren't seeing what is really happening. The numbers in Smanager are more accurate than the AEM gauge.

GSRRR · Post by **GSRRR** » Fri Jun 26, 2009 11:23 am

That makes perfect sense. Thanks for the quick response. I know that setting up the offset doesn't change how fast it reads. Its there so you can match up the ECU reading with the gauge reading.

My question is.... is there a trick to setting up the offset? The reading fluctuates so fast that its almost impossible to get it to be perfect.

I know that it's going to be different for every O2 sensor, but my offset is currently set to -0.51 does that sound about normal? On my Hondata, the leanest it can detect the a/f is 16.74.... is that normal as well?

Martian · Post by **Martian** » Mon Jun 29, 2009 4:13 pm

you need to double click the "AF" in the sensors window, then change the max and min to fit your wideband.

Post by **Spunkster** » Mon Jun 29, 2009 4:52 pm

Set the offeset with the engine off but the key in the on position. This way you have a constant AF reading. not reading leaner than 16 indicates a problem somewhere.

GSRRR · Post by **GSRRR** » Tue Jun 30, 2009 11:57 pm

Thanks, I did as you suggested and set my offset with the engine off. Worked well and now my A/F gauge matches my Smanager (ECU) reading.

My problem now is that in Smanager, the leanest it can read my A/F is 16.74. My AEM wideband gauge reads all the way up to 20 and is fine, but in Smanger it doesn't read that high. What could be wrong? I've heard somewhere that the ECU can only read up to about 3.3 volts or something. The wideband goes all the way up to 5 volts. Is that the problem?

My Voltage/Lamda conversion table is currently set to:
0.00v - 10.00 / 5.00v - 20.00 / 5.00v - 20.00

That should work for the AEM EUGO wideband right? Whats the leanest Smanager should be able to read?

fly_n · Post by **fly_n** » Wed Jul 01, 2009 3:27 am

if u have the wideband signal inputing to D14(stock narrowband input) on the ecu,then apparently its limited to about 3.xV,im not sure never tried it personally,but u will most likely have to use one of the other alternative inputs for wideband(depending whether your ecu is capable of reading whichever alternative u try to use).

search posts by user XEPHODATA he makes some interesting points against using the D10 ELD input,which hondata will recommend u use,try D12 EGRLS if u have not got a jdm ecu & u are having trouble with D10.
if u have a jdm ecu,then search my post on D12 input,might help u,although i havent got around to making the fix yet....