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Author Topic: O2 Sensor Output (mv) compared to measured AFR  (Read 153822 times)

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FLTRI

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #465 on: July 29, 2013, 10:47:33 PM »

What are you thinking with linked tables?  (That is not sarcasm. I really am asking a question)
It's somethIng that's been in SEPST since the beginning. Makes for quick rough-in, especially break-in, calibrations.

As the programmers say "it is just typing".

Andy
Until it's debugging time. Lol
Bob
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whittlebeast

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Re: Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #466 on: July 29, 2013, 10:59:18 PM »

Will do Andy I just want the O2 voltage to be just one decimal more accurate BC it will only show 1.7 or 1.6.  I just need to learn how to use the program a little better.

I just looked at one of his tunes.  The guy can tune......

Bob, the guys in the Megasquirt world are real good at typing and reading logs.

Andy
« Last Edit: July 29, 2013, 11:05:32 PM by whittlebeast »
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FLTRI

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #467 on: July 30, 2013, 02:51:46 PM »

Been involved in a few software/hardware developments for d/a systems related to race
vehicles and can say with great confidence, there are always bugs and
rewrites.
Just part of the r&d process no matter how smart the engineers and programmers are.
Bob
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FLTRI

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #468 on: July 31, 2013, 06:10:01 PM »

Any word from Mayor as to how his testing is coming?
How 'bout Andy with Joe's data?
Bob
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joe_lyons50023

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Re: Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #469 on: July 31, 2013, 06:47:09 PM »

I gotta do another log tomorow b/c my O2 voltage didn't record b/c I had auto tune pro enabled and that prevents recording of NB voltage while it records data for tuning.  I am going to set my afr table to 13.2 and record the voltages tomorow.  Andy will be away for about a week but I will try to get it done myself.
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whittlebeast

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #470 on: August 01, 2013, 12:09:23 AM »

Here is an interesting example of the sort of thing that shows up when you look at the data.





The AFRs are moving at about a 1.5 AFR swing and back about once a second as displayed in the second plot.  This can be felt from the seat as a pulsing in the power.

Andy
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ultraswede

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #471 on: August 01, 2013, 12:26:46 PM »

whittlebeast, a sporty tune?

It almost looks like the ECM is in CL, probably not since you hit high Kpa.
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FLTRI

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #472 on: August 01, 2013, 01:14:00 PM »

Always helps to know what the data is from. Whatever it is just jumps out at you doesn't it?
Bob
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joe_lyons50023

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Re: Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #473 on: August 01, 2013, 02:32:51 PM »

Pretty sure it is from his sportster. He was telling me about how the sportster has a 1 afr swing and that's one of the reasons they run in part throttle like they do.
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FLTRI

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Re: Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #474 on: August 01, 2013, 03:01:27 PM »

Pretty sure it is from his sportster. He was telling me about how the sportster has a 1 afr swing and that's one of the reasons they run in part throttle like they do.
Nothing a proper tune wouldn't cure.
Exhaust causes closed loop issues due to short pipes with a balance tube affecting O2 reading especially @ lower kpas.
Bob
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joe_lyons50023

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Re: Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #475 on: August 01, 2013, 06:38:43 PM »

Pretty sure he prob tuned his bike but?
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joe_lyons50023

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #476 on: August 02, 2013, 10:02:06 AM »

Here a bit of info.  Mabie if the damn weather works out I can do another log to where I have the Afr table set from 13 to 14 so I can get more of a spread but with this you get the idea.
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whittlebeast

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Re: Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #477 on: August 02, 2013, 10:03:55 AM »

Pretty sure he prob tuned his bike but?

That is a totally stock tune running a stock sporty.  My tune that I run looks and runs very different.

Andy
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joe_lyons50023

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Re: Re: Re: Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #478 on: August 02, 2013, 10:45:00 AM »

That is a totally stock tune running a stock sporty.  My tune that I run looks and runs very different.

Andy
Gotcha.  Thanks for the tip on getting that narrow band voltage scaled the way that I wanted.
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FLTRI

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Re: O2 Sensor Output (mv) compared to measured AFR
« Reply #479 on: August 02, 2013, 11:21:41 AM »

And the answer is....?
Bob
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