is the front o2 sensor a wideband sensor?

[Kodename47]

Did anyone create a good accurate-ish calibration for this? I've had a go based on my dyno wideband results from the weekend but I know that tailpipe generated results won't be as accurate, so I'd like to see what other have done.

[ztan]

Resurrecting this thread.

Looking down the Denso doc that arghx7 shared, I see more extended curves later on.

Also looking at stock and Shiv's 1.59 O2 scales, looks like there is a lot more data that can be plugged into the bottom end of the scale, with the 3 cells over 0.43mA not being needed.

Has anyone benchtested the particular sensor that we have and give us scaling values for the rich end of the scale in better resolution?

Off the paper curves (which don't match stock ROM values):
AFR mA
10 -1.8
11 -1.25
12 -0.8
13 -0.45

[Kodename47]

Originally Posted by ztan

Has anyone benchtested the particular sensor that we have and give us scaling values for the rich end of the scale in better resolution?

EcuTek have and supply it in their documentation....

[dave-]

Originally Posted by ztan

Resurrecting this thread.

And again! @ztan did you make any progress on the scaling changes? Or even test against a proper wideband?

[ztan]

Originally Posted by dave-

And again! @ztan did you make any progress on the scaling changes? Or even test against a proper wideband?

Only got around to it today:

I had a look at the Bosch 4.9 and Denso curves - they are quite similar in mA vs lambda measurements. Our stock ROM reads quite close to the Bosch curve x 0.61.

Made an extended table for the front O2 sensor scaling that is shown below (working down to a 10.5 limit, next testing a 10.0 limit).

The results of that curve vs a PLX SM-AFR (installed last week) with Bosch 4.9 wideband (units in lambda with range from 0.68-1.38) attached. I think that with the extended scaling, the Denso sensor actually performs quite well. The ECU sensor has a smoothed output and I think that is responsible for the higher variability on the lean quadrant of the chart when switching between fueling and deceleration cut.

[g0odspeed]

Originally Posted by mad_sb

So, it sounds like the upstream sensor is wideband and the downstream sensor is narrow band.

Did you ever find out for certain if the second sensor was narrow band?