Narrowband O2 sensor wiring?
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Narrowband O2 sensor wiring? Hi;
I am measuring only .86v max from my Dynotune digital gauge where it should be around .94v initially because my Z06 is turbo tuned for a dyno initial 12.9AFR to 11.1AFR max.
Could the wire I ran to the O2 be dropping the Voltage that much?
Thanks!
I am measuring only .86v max from my Dynotune digital gauge where it should be around .94v initially because my Z06 is turbo tuned for a dyno initial 12.9AFR to 11.1AFR max.
Could the wire I ran to the O2 be dropping the Voltage that much?
Thanks!
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Whether a narrow band reads .86 Vs .94 does not indicate what your A/F is, just that you are more rich then 14.7. At that extreme of the narrow band's range, a different one probably would read differently. Don't try to tune a turbo car with a narrow band.
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Thanks, I'm not tuning the car but it gets .83v at part throttle and .86 max at wide open throttle. That doesn't tell me much! Dynotune claims the gauge will read a narrow band and even can tune with it.
It makes sense that for the stock intent of the 02 the limitation that I am seeing is perfectly exceptable.
It makes sense that for the stock intent of the 02 the limitation that I am seeing is perfectly exceptable.
That reading means it could possibly be running lean (ie in the 13.5:1~14.0:1 AFR range). You need to have your AFR read by a WBO2 in order to get an accurate reading. I have typically seen cars running the right AFR with headers in the .93x~.94x range on the NBO2 voltages. I agree with the above saying they're not accurate for tuning purposes. But, I don't think they are so inaccurate that they can't detect a general lean condition at WOT. Find someone who can plug into your header bung and get a good reading....
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I had my car dyno'd a few weeks ago and the AFR was hitting 10.8 out of the tail pipe, and I'm sure it would have blown up by now if it was that lean so I ask again does anyone think my thin wiring could be dropping the voltage?
I doubt wire impedance would eat up that much voltage, considering the short distance between the O2 and the cockpit of the car. I'd be more inclined to check for a ground offset issue.
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Originally Posted by rosulekg
I had my car dyno'd a few weeks ago and the AFR was hitting 10.8 out of the tail pipe, and I'm sure it would have blown up by now if it was that lean so I ask again does anyone think my thin wiring could be dropping the voltage?
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My car is a turbo and should have blown up if I was running to there chart!
Check it out:
http://www.dynotunenitrous.com/store...p?idproduct=15
I'm just trying to find out if I am missing something or is this thing going to have to be Normally Aspirated only!!
Check it out:
http://www.dynotunenitrous.com/store...p?idproduct=15
I'm just trying to find out if I am missing something or is this thing going to have to be Normally Aspirated only!!
Last edited by rosulekg; Aug 24, 2006 at 03:40 PM.
The O2 sensor PCM inputs draw negligible current so you
are not likely dropping any voltage along the wire regardless
of wire gauge. The sensor output in the rich region (> 0.7V)
varies more with temp than with mixture. Even same car,
same settings, thermal history alone will jack you around
a lot in voltage, to the point that it's no better than maybe
0.5 AFR accurate even if you had a good NB:WB correlation
for your unique plumbing and thermals.
are not likely dropping any voltage along the wire regardless
of wire gauge. The sensor output in the rich region (> 0.7V)
varies more with temp than with mixture. Even same car,
same settings, thermal history alone will jack you around
a lot in voltage, to the point that it's no better than maybe
0.5 AFR accurate even if you had a good NB:WB correlation
for your unique plumbing and thermals.
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Thanks, i just got a .9v out of it at partial throttle, and for some reason I feel better. My tuner told me this would happen, but I wanted something and I'm going to get a tune and more boost next year. Anyway, I put an DPST switch in to track both the sensors so I can at least be following my normal fuel, Thanks again!
