O2mv
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
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From: Dallas TX
O2mv
Ok, so O2's should be reading between 870 and 890 idealy. I'm running around 890-910 when in power enrichment mode. Does higher mean lean... or rich? And is 870-890 close to 12.7 a/f ?
Thanks!
Thanks!
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: O2mv (needanother1)
Higher O2 voltage = richer.
Not sure on the AFR question, but that sounds about right. Someone who knows more than me will answer shortly, I'm sure.
Not sure on the AFR question, but that sounds about right. Someone who knows more than me will answer shortly, I'm sure.
Racer
Joined: Jul 2002
Posts: 269
Likes: 0
From: Paris AR, USA
Re: O2mv (GlockLT4)
I really shouldn't answer that because I'm not an authority on this stuff by any means. I have read that WOT O2 readings should be around .870 and higher.
I do know that higher O2 voltage indicates richer exhaust, but I'd hate to go further than that for fear of talking above my head, so to speak. :crazy:
Jason
[Modified by needanother1, 4:11 AM 5/18/2003]
I do know that higher O2 voltage indicates richer exhaust, but I'd hate to go further than that for fear of talking above my head, so to speak. :crazy:
Jason
[Modified by needanother1, 4:11 AM 5/18/2003]
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: O2mv (needanother1)
I really shouldn't answer that because I'm not an authority on this stuff by any means. I have read that WOT O2 readings should be around .870 and higher.
I do know that higher O2 voltage indicates richer exhaust, but I'd hate to go further than that for fear of talking above my head, so to speak. :crazy:
Jason
[Modified by needanother1, 4:11 AM 5/18/2003]
I do know that higher O2 voltage indicates richer exhaust, but I'd hate to go further than that for fear of talking above my head, so to speak. :crazy:
Jason
[Modified by needanother1, 4:11 AM 5/18/2003]
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Re: O2mv (GlockLT4)
One thing to remember about "narrow band" O2 sensors that are used in our cars. They do just that, operate in a narrow band of the stoich area of 14.7:1 (450mV) once out of that region they are not very accurate. Running in PE mode is a good idea to stay above 850mV and into th 900mV region to be safe. Especially if you are running a blown car. I run 900 to 920 in my car under boost conditions. Yes its rich, but its safe. Loss of Hp you may ask, yes most likely I am loosing a couple but when I have a tad over 600 on tap I won't notice it....but its safe :)
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
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From: Dallas TX
Re: O2mv (tjwong)
One thing to remember about "narrow band" O2 sensors that are used in our cars. They do just that, operate in a narrow band of the stoich area of 14.7:1 (450mV) once out of that region they are not very accurate. Running in PE mode is a good idea to stay above 850mV and into th 900mV region to be safe. Especially if you are running a blown car. I run 900 to 920 in my car under boost conditions. Yes its rich, but its safe. Loss of Hp you may ask, yes most likely I am loosing a couple but when I have a tad over 600 on tap I won't notice it....but its safe :)
[Modified by GlockLT4, 1:15 PM 5/18/2003]
Safety Car
Joined: Dec 1999
Posts: 4,691
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From: Framingham MA
Re: O2mv (GlockLT4)
With a narrow band o2, it is hard to tune for a specific mv. From 300-700mv is around 14.7:1. Each sensor varies. I alway laugh when some tries to tune for specific o2 voltage from a recommendation, it is a shot in the dark. aYour better off trying to get a flat o2 voltage at wot and adjust your tuning (either lean or rich) from reading your spark plugs...or just buy a WB o2 set up.
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Drifting
Joined: Jun 2001
Posts: 1,997
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From: Lake Ozark MO
Re: O2mv (GlockLT4)
I've always read that you can't trust the narrow band O2's for anything other than "richer than 14.7" or "leaner than 14.7".
After hitting the dyno with several other Corvettes and using a wideband O2 sensor I can definitely say that it is true.
On my initial pull my AFR was about 13.2 on the wideband and my O2 mV was about 900-920.
After richening up the program the AFR went to 12.5-12.8 and the O2 mV stayed the same.
Another fellow with a '96 GS and basically the same setup as me was initially running an AFR of 11.5. His O2's read about 890-900. After leaning his car out a point the O2's read the same.
So I'm pretty convinced that if you are running around 900mV for your O2 readings then you can say you're definitely running richer than 14.7 but by how much is a guess.
After hitting the dyno with several other Corvettes and using a wideband O2 sensor I can definitely say that it is true.
On my initial pull my AFR was about 13.2 on the wideband and my O2 mV was about 900-920.
After richening up the program the AFR went to 12.5-12.8 and the O2 mV stayed the same.
Another fellow with a '96 GS and basically the same setup as me was initially running an AFR of 11.5. His O2's read about 890-900. After leaning his car out a point the O2's read the same.
So I'm pretty convinced that if you are running around 900mV for your O2 readings then you can say you're definitely running richer than 14.7 but by how much is a guess.
Thread Starter
Team Owner
Joined: Apr 2001
Posts: 22,267
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From: Dallas TX
Re: O2mv (Dan Parker '96)
That makes sense dan ... wish our cars came with wideband! How does the computer adjust BLM's right if it can't even see the full spectrum with only narrow band sensors though?
