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At 3500 RPM's....

This is a discussion on At 3500 RPM's.... within the Computer & Tuning forums, part of the LSx Technical Help Section category; What should the O2 voltage readings be if stoich? I would go higher...but the motor is brand new. And I ...

  1. #1
    Slow'er'Ass Mr. Luos's Avatar
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    At 3500 RPM's....

    What should the O2 voltage readings be if stoich?

    I would go higher...but the motor is brand new. And I would like to know what they are reading....
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    Senior Member ninobrn99's Avatar
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    if you havent entered PE, then it should be stoich from what i gather. its only when your in PE or OL that you will see a difference in A/F. someone correct me if im wrong.

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    Slow'er'Ass Mr. Luos's Avatar
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    I have voltage readings...probably not the most accurate...but should at least give me an idea how rich it is.
    At least that is how I took it.
    Maybe I am wrong.

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    Token V6 Guy
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    your stock o2's will/should switch back and forth anywhere between 0-1000mv at idle & part throttle.

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by foff667
    your stock o2's will/should switch back and forth anywhere between 0-1000mv at idle & part throttle.
    I know.

    What about WOT at 3500-5500 RPM's??

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    Token V6 Guy
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    750-1000mv is normal.

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    Slow'er'Ass Mr. Luos's Avatar
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    Alright then...those look good.
    Must be something else.

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    Slow'er'Ass Mr. Luos's Avatar
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    Actually...thinking about it...

    Don't I want my O2's right around .920mV at WOT??

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    Token V6 Guy
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    stock o2's are completely innaccurate at any a/f ratio other then 14.7:1 so at .920 one car might be running at 13.0:1 and in another it might be 11.5:1...and those numbers could change from run to run & day to day. So the answer is no...using stock o2's give you no accurate info.

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    Slow'er'Ass Mr. Luos's Avatar
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    Okay...but at the very least...they shouldn't being varying in voltage at WOT should they?

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    We'll be back... GatorSS's Avatar
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    Quote Originally Posted by foff667
    stock o2's are completely innaccurate at any a/f ratio other then 14.7:1 so at .920 one car might be running at 13.0:1 and in another it might be 11.5:1...and those numbers could change from run to run & day to day. So the answer is no...using stock o2's give you no accurate info.
    Stock O2s are crap for info. Learned that the hard way.

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    Token V6 Guy
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    Quote Originally Posted by Mr. Luos
    Okay...but at the very least...they shouldn't being varying in voltage at WOT should they?
    they will/should move only slightly ie 850-900mv or 900-950, etc. But generally no they shouldnt fluxuate...not in fbodies at least...lsx trucks are a whole different story.

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    Slow'er'Ass Mr. Luos's Avatar
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    Screw it....these stockers have been through hell.

    2002 C5 rears are ordered.

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    Tech Junkie hammertime's Avatar
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    Ideally, you should use a wideband O2 sensor for tuning purposes. It can read the A/F ratio much more accurately than any stock type sensor.

    Cyles in a small range for the stock sensor is normal, but the farther away from stoich you get, the less accurate the sensor is.
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    Slow'er'Ass Mr. Luos's Avatar
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    I want to put a wideband on it eventually...just can't afford it right now. Maybe depending on tax refund.

    I was looking at my log file compared to a couple others and my O2's are acting much different. They seem to be 'lazy' and bounce around too much for my liking at WOT.

    I get the Delco C5 rears tomorrow.

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