What do I do with Lambda?

[flightlead404]

So I'm collecting parts for my upgrades (cam, turbo, headers, intercooler, WUR, rpm switch and so on).

I will be installing a wideband O2 sensor/boost sensor. Brian's headers have one O2 sensor bung.

What do I need to do wrt Lambda stuff?

Put in an additional bung or disconnect Lambda? If disconnect, what do I do about the frequency valve? Just leave it disconnected?

Cheers

86 3.3L

[mark houghton]

I have always ran without the Lambda being active. Very simply, unplug the O2 sensor and re-tune your mixture/AFR via the adjustment on the air/fuel flow metering arm and/or your WUR (if adjustable). That Lambda is always trying to lean things out, so just do away with it unless you must have it for emissions testing.
Do not disconnect the frequency valve....with the O2 unplugged, it will settle in to a default duty cycle of something like 50%. If you unplug it, you will see way lean AFR's beyond which you can adjust out. It is possible to run without the freq valve, but you would have to adjust and balance the fuel distributor for each injector to return to the proper AFR. I have never done it....others here have and can chime in.

[flightlead404]

Originally Posted by mark houghton

I have always ran without the Lambda being active. Very simply, unplug the O2 sensor and re-tune your mixture/AFR via the adjustment on the air/fuel flow metering arm and/or your WUR (if adjustable). That Lambda is always trying to lean things out, so just do away with it unless you must have it for emissions testing.
Do not disconnect the frequency valve....with the O2 unplugged, it will settle in to a default duty cycle of something like 50%. If you unplug it, you will see way lean AFR's beyond which you can adjust out. It is possible to run without the freq valve, but you would have to adjust and balance the fuel distributor for each injector to return to the proper AFR. I have never done it....others here have and can chime in.

Thanks Mark. That's what I thought, wanted to make sure.

I do see that some of the wideband O2 sensors also have an analog out and wondered if people were using that to drive the Lambda valve.

[bpu699]

My plx meter has an anague output. I like it and use it. Keeps the mixture correct at cruise and I didn't need another bung.