O2 Volts vs. AFR
O2 Volts vs. AFR
I want to make a calibration curve that can translate logged O2 voltage data to (approximate) AFR you would get from a wide band. This allows tuning without a wide band O2 (just using the OEM O2 sensor instead). I have been using the curve below, and it works pretty good, but it is based on only a couple of points which isn't enough really. If anybody has a log with both wide band AFR and volts from the front O2 sensor, can you post in this thread please? Thanks!
Last edited by voidhawk; May 9, 2009 at 11:22 AM.
I am pretty sure I can log o2 voltage from EvoScan. If I can log it, I'll give you my wideband and o2 data.
Disclaimer: I am not responsible for anything if it doesn't work out for you
Disclaimer: I am not responsible for anything if it doesn't work out for you
Hey - sorry for some reason I didn't get a notification that somebody has replied to this thread until now. Yes, still interested, any format is fine (csv, XL, whatever). Thanks!
Evolving Member
Joined: Feb 2008
Posts: 254
Likes: 1
From: SoCal
From the 'How to Tune an Evo' thread (https://www.evolutionm.net/forums/ec...une-evo.html):
3. Wideband O2 meter (WBO2): Do not attempt to tune your Evo if you do not have a WBO2 meter. Do not use the narrowband O2 sensor on the Evo to tune the car. The NBO2 was not intended for tuning purposes. It is used for emissions and it is only accurate under stoichometeric conditions and even then it is barely accurate. Tuning with a NBO2 was used back in the DSM days when WBO2 were very expensive and no one could afford them. Today, you can get a WBO2 meter for as little as $180. I use Innovate products. I have an LM-1/LM-A2 with two XD-1 gauges. One gauge reads AFR and the other gauge reads boost. The cost was $750. It was worth every penny. I have had zero problems with this kit.
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There is a reason why people are spending money on WB A/F meters and logging systems, and not using the stock NB O2 sensor for tuning. I use a Zeitronix system, that I am very happy with, that has a low-profile LCD that can show either instantaneous or max lambda, AFR, boost and EGT readings, and does logging too.
3. Wideband O2 meter (WBO2): Do not attempt to tune your Evo if you do not have a WBO2 meter. Do not use the narrowband O2 sensor on the Evo to tune the car. The NBO2 was not intended for tuning purposes. It is used for emissions and it is only accurate under stoichometeric conditions and even then it is barely accurate. Tuning with a NBO2 was used back in the DSM days when WBO2 were very expensive and no one could afford them. Today, you can get a WBO2 meter for as little as $180. I use Innovate products. I have an LM-1/LM-A2 with two XD-1 gauges. One gauge reads AFR and the other gauge reads boost. The cost was $750. It was worth every penny. I have had zero problems with this kit.
-------------------------
There is a reason why people are spending money on WB A/F meters and logging systems, and not using the stock NB O2 sensor for tuning. I use a Zeitronix system, that I am very happy with, that has a low-profile LCD that can show either instantaneous or max lambda, AFR, boost and EGT readings, and does logging too.
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