wideband offset :

some times when you hooke up your wideband and connect it to your flasher , your wideband gauge will read different than you flasher (small difference)

the problem
http://www.hptuners.com/forum/showthread.p...+voltage+offset

how to fix it
http://www.hptuners.com/forum/showthread.php?t=11018

but dont worry s2000 is well grounded , try to use a good ground point for your wideband (battery) .

and sorry I didnot know s2000s has a wideband , I thought it was a narrowband sensor .

 

 

I appreciate the info, but I think you are describing an issue with the analog output from the wideband controller to a standalone ecu. My readings are coming from the datalogger that is built into the wideband controller itself, which is digital. I didn't see anything suspicious about the air / fuel curve that it recorded, since it would display 20.9 in free air, and would hover around 14.7 at a steady cruise.

 

I forgot to mention that the early S2000's did have narrow band O2's, but the later S2000's have wide band O2's. I think the change happened in '06 when they went to DBW.

 

i agree - make af corr. adjustable.

looking at the fpro's help screens - looks like the af corr. is based on a civic si. so maybe the s2k's primary is better....

they should redo the study using a s2k... but either way an adjustable af corr would be best so you could do what you did or at a dyno house and update the af corr....

 

weird . my wideband (ngk afx) is reading leaner than my AF , closer to AF corr .

I will replace the sensor and my test pipe gasket then I will do another test . my wideband AFR reading is form 13 to 14 at WOT .

 

No Hondata response?

 

just curious, with the latest release of flashpro manager, did hondata change the A/F setting? before I was running 12.8-13.1 at WOT and now when I did a log, it shows 12.1 - 12.4.

I haven't touch the tune since the release.

I guess I have to do some re-tuning. It could possibly be the heat of summer that is changing the a/f as well.

 

Does anyone know if there is a calibration method to the factory o2 sensor? Most widebands do this and I am curious how the factory sensors figure this out.

 

Which AF value are you looking at? I don't think Hondata would have changed the regular AF value, but I hope they did change the AF Corr value. That said, I haven't noticed any change in my datalogs.

I am not aware of any autocalibration that the ECU does with the OEM wideband.