Lambda (wideband) vs. narrowband O2 voltages (BWW)...
12-13-2004, 12:48 PM
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Lambda (wideband) vs. narrowband O2 voltages (BWW)...
Four runs with logged O2V (through ECUx) plotted along with actual lambda (logged with an LM1 datalogger). Gather from them what you will.
<img src="http://www.pramanik.net/galleries/misc_post/LVO1.GIF">
<img src="http://www.pramanik.net/galleries/misc_post/LVO2.GIF">
<img src="http://www.pramanik.net/galleries/misc_post/LVO3.GIF">
<img src="http://www.pramanik.net/galleries/misc_post/LVO4.GIF">
-Dave Pramanik
<img src="http://www.pramanik.net/galleries/misc_post/LVO1.GIF">
<img src="http://www.pramanik.net/galleries/misc_post/LVO2.GIF">
<img src="http://www.pramanik.net/galleries/misc_post/LVO3.GIF">
<img src="http://www.pramanik.net/galleries/misc_post/LVO4.GIF">
-Dave Pramanik
12-13-2004, 01:31 PM
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I thought Lambda and O2 V are not the same thing
But there is a relationship between the two. Refer to chart A in the link.<ul><li><a href="https://forums.audiworld.com/s4/msgs/1104635.phtml">clicky</a></li></ul>
12-13-2004, 01:43 PM
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Yep. Looks like the values correspond but...
Large Lambda changes show very little change in 02 sensor voltage on DAP's charts. Narrow band appears to be only useful for "eyeballing" when looking at A/F during WOT (11-12:1). IMO of course.
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12-13-2004, 03:17 PM
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Yeah, I know it's common knowledge but...
people may have differing views on how useful narrowband is. Folks here definitely DO use it as a reference. It's always nice to see data that illustrates the point...and this does.
12-13-2004, 03:33 PM
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Couple of questions/comments....
I assume the X axis is some sort of time. Is each plot a single pass through through the RPMS?
I know you have K04s, what software/injectors/MAF are you running? Even without STFA, I would guess GIAC.
It would be interesting if you could lean out the right part of the plot and see if there is any impact on knock activity. I guess it isn't possible if you only have Lemmi at your disposal.
I know you have K04s, what software/injectors/MAF are you running? Even without STFA, I would guess GIAC.
It would be interesting if you could lean out the right part of the plot and see if there is any impact on knock activity. I guess it isn't possible if you only have Lemmi at your disposal.