02 Sensor Voltage
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
Originally Posted by gpracer1
Richer. A "rough" value of .89 at WOT is good.
I use HP Tuners. before I changed the cam, I datalogged it at WOT.
Like you state, I found the o2 sensors running around .905v-.910v w/stock cam. Data was logged several times for verification.
After the cam install, I'm seeing data:
4200-5200: ~0.938v
5200-5500: ~0.929v
5500-6500: ~0.920v.
Ah, work to do... Any ideas for the best peak performance, please post...
Melting Slicks
Joined: Mar 2005
Posts: 2,252
Likes: 181
From: NE OH
Originally Posted by vettenuts
Are you using a wide band? I wouldn't use the narrow band O2 for tuning.
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
Originally Posted by muncie21
Agreed!! Look at the output signal of a factory O2 below and tell me if you want to tune your motor with it.....
Burning Brakes
Joined: Jul 2004
Posts: 866
Likes: 5
From: Jensen Beach FL
Just because it’s consistent, doesn’t mean it’s accurate.
Narrowband O2 sensors are only accurate at 0.5v (14.7:1). Higher and lower voltage readings may be consistent but they are not accurate in terms of A/F ratio.
Narrowband O2 sensors are only accurate at 0.5v (14.7:1). Higher and lower voltage readings may be consistent but they are not accurate in terms of A/F ratio.
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Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
Originally Posted by MGorman
Just because it’s consistent, doesn’t mean it’s accurate.
Narrowband O2 sensors are only accurate at 0.5v (14.7:1). Higher and lower voltage readings may be consistent but they are not accurate in terms of A/F ratio.
Narrowband O2 sensors are only accurate at 0.5v (14.7:1). Higher and lower voltage readings may be consistent but they are not accurate in terms of A/F ratio.
It doesn't matter what the A/F is as I am not using them for A/F. Let me explain. In both my 02 and 03 Z, I datalogged the stock engines many times. In both cases, the engines/02 sensors continually produce 02 voltages that in my opinion were consistent to around 20 millivolts. This voltage is relative and the A/F is irrelevant. The voltage produced is consistent. This voltage gives me a 1:1 correlation w/the [stock A/F] that GM thought made good power and was safe.
I don't really need to know what this A/F is since I trust the car was already making great power stock.
What I already know is that my car runs 12.4:1 at WOT completetly stock. A slight leaning of the engine produces more power which is exactly the relative change I see in voltage and power. IE, it works well.
I had TWO widebands mounted in my rear sensor slots in my 03 Z.
It didn't mean squat. After tweaking power on the dyno, I found the best (RELATIVE) A/F for that meter was 11.7:1 for my car's combo /tune. You can't put every tune in to a neat little wideband box. It doesn't fit. You gotta learn to use all the tools avail to you. This one works great.
Last edited by 427CPE; Nov 9, 2006 at 10:32 PM.