Syvecs Forums

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No, but when 3 lambda meters of entirely different kinds/sensors read pretty much the same

I really dont care if it's LAB grade or not.

If all 3 of them had read vastly differently then yes I would have had concerns. But I'd be very impressed of all 3 units I tried on my own car were identically inaccurate lol.

Is there any evidence to suggest anyone has had a problem with the NTK's readings in the real world ?

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too old to argue

Many things could account for a difference between the two banks.


Put the two sensors in the same tube on the same bank and report how they read. If there is a large discrepency there, then yes I would be concerned.

Till now on every syvecs with the lza sensor i had to calibrate it. Checked with 3 different widebands. Which linearisation are you using exactly?

CT9A wrote:Till now on every syvecs with the lza sensor i had to calibrate it. Checked with 3 different widebands. Which linearisation are you using exactly?

Strangely enough the one supplied for the LZA.

And ask for a simple test and Peter goes off in a huff....really ?

So, after changing to an S8, I have dual lambda ability onboard with the ecu.

I fitted 2 LZA sensors into the same right hand bank of my V8. One is installed vertically into the exhaust stream, the other about 4inches downstream and at an angle. This was simply how I'd installed the lambda bungs for clearance reasons.
Either way, they're in the same pipe and close together. Using the same LZA calibration as supplied.

Are the two perfect at all times ? no, but they're damn close the majority of the time. The log is much longer but here is a snapshot, top graph rpm/speed only and bottom graph LAM1 and 2
Not a lot of point zooming in as the two lines track each other very closely almost the entire time so wanted to show a more long term view. On load graph is erratic due to traction loss/control being active. But it's about 2m30s on screen.

Of course all this shows is that two sensors will read pretty close to the same. One sensor ( LAM2 ) is around 2 years old, LAM1 is brand new today. Are they "accurate" ? I've no idea. I guess it depends what is classed as accurate.
But as said, comparing to similar tests ages ago with the other widebands I have, one with an original L1H1 and another LSU4.9, they all read damn close when placed in the same pipe. I'm not about to weld 4 bungs into one pipe to test them all at once though