Wideband O2 Tuning

[dholloway543]

I have installed a wideband o2 sensor on the downpipe to the sbd500x turbo kit. Everything seems fine except for at 2800rpm to 3000rpm i get a weird resonance that i cant seem to figure out where its coming from.


https://datazap.me/u/dholloway543/we...zoom=1160-2425


The O2 #2 Voltage is my wideband. You can calculate the AFR on the sensor with this equation.


AFR = 3.008 * Voltage + 7.35


I used excel to add the Fuel trim combined line and trimmed out the section that is bad.


Any ideas on what might cause it would help out alot

[dholloway543]

After looking closer at it, it looks like the throttle pedal is reading the values like that. Is there a smoothing value in ecutek

[tomm.brz]

how did you connected it and where did you take the power for it and what did you do on the racerom tables to try make it working?
i have a wideband 24/7 in my headers and i get toatlly different signal in the o2 connector, it seems it isnt working
racerom has everything to make the wideband afr viewable without conversions directly in log trhough the value "Wideband AFR"

that was an old test while i was tuning everything , but you can see o2 voltage and Wideband afr
https://datazap.me/u/tommbrz/io-v400...1&zoom=142-351

[steve99]

Maybe turn off the ecutek closed loop fueling till you get wideband sorted as its causing wild swings in afr due to the weird readings from the wideband i suspect.



also injector pulse widths dont seem to be logging which is strange. you can use pulsewidths to check if the afr reading is correct ie if you see more pulsewidths and afr going leaner its likely not correct.


Also rescale the front 02 sensor you wont rearly needcthe wideband and the wideband should read failry similar to the front 02.

[dholloway543]

So you were right, The LC-2 defaults to a specific voltage before its calibrated. I found the link here


https://redirect.viglink.com/?format...C-2_Manual.pdf


and now that its calibrated it spits out correct voltages