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Old 03-31-2010, 07:48 PM   #1
maxgs
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O2 Sensor Logging

Does anybody have experience with live data from an O2 sensor? Either captured via data acquisition or on a gauge?

I have a couple of questions about what I'm seeing from my data.

-Curt
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Old 03-31-2010, 07:54 PM   #2
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Old 03-31-2010, 08:05 PM   #3
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I know bosch LH and standard for cars, the 0-1v and 0-5v oscillating about 10 times a second.
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Old 03-31-2010, 08:11 PM   #4
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are your questions about lambda readings converting to air fuel?
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Old 03-31-2010, 08:23 PM   #5
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What should i expect the o2 sensor readings to look like off throttle? I expected them to be rich, instead it's really high indicating a lean condition. The o2 sensor is mounted in the collector. It's about where you'd normally find the exit of the cat.
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Old 03-31-2010, 08:38 PM   #6
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Take a look at this graph.

The green line is Air/Fuel ratio. Red line is the tach, and blue line is the throttle position.

The scale for A/F is on the right and the scale for tach is on the left. Note that where I'm off throttle, the A/F jumps way up. It's off the scale at 29.4. Does that make sense to anybody?

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Old 03-31-2010, 08:46 PM   #7
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Fuel is cut when your off throttle. Although the mixture is still burning the only fuel in the system is what the bike matrices show for engine load and throttle input. The temp of the mixture is also cooler and the O2 senser derives its signal from the ambient air on the outside sensor housing vs the collector on the inside of the exhaust.


Its a lack of fuel not increase in air you see when cutting throttle. Same reason over exhausted harleys crack on devel, too lean in the pipes.


.... Sorry if message is scrambled, on my phone.....
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Old 03-31-2010, 08:47 PM   #8
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And FYI my experience is from closed loop cars, not open loop bike systems.
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Old 04-01-2010, 07:36 AM   #9
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Quote:
Originally Posted by maxgs View Post
What should i expect the o2 sensor readings to look like off throttle? I expected them to be rich, instead it's really high indicating a lean condition. The o2 sensor is mounted in the collector. It's about where you'd normally find the exit of the cat.
I don't know about a gsxr in particular, but a lot of vehicles turn injectors off entirely on decel. This is why you get "lean pops."
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