Using the Bosch sensor, what's the AFR to Volts conversion for the narrow-band simulation?

Everyone wants to say "oh, it can be anything because it's programmable..." But outside of that BS answer, what is the default conversion for the LC1 with a bosch unit in the narrow-band simulation mode?

Innovate's forum is remarkably evasive on this (or I suck at using the search tool) - and I'm having a diffiult time with simple math!

 

Hmm I do recall that the LC1 cable can simulate a narrow band signal. You can program it for what ever output that you want but I am not sure if you can program it to do a narrow band output of 0 to 1000mV. If you connect your PC to the cable and go into the programming mode. The manual specifies that the analog output number 1 is factory default to simulate a narrow band.
The setting should be 1.100 Volts = 0.958 lamda and .105 Volts = 1.022 Lamda and the lamda box should be checked.

 

I'm just trying to figure out EXACTLY what my AFR is....


I get almost a consistant ~970mV under WOT conditions (which is remarkably VERY, VERY close to what I was running with the stock NB sensor!), so I'm trying to do a conversion to AFR. I've been playing around with the numbers and wind up showing that I'm at approx 14.2 AFR at 970mv with the "narrow band simulator?" And that just doesn't make sense (to be so lean at WOT).

I guess my beef is that - yeah, you CAN program it for whatever scale you want - but very few people actually do! lol. Most of us just replace the stock O2 and since it's already simulating the narrowband we leave the settings alone. It would just be nice to have a graph saying "for the factory narrowband emulation, your volts to AFR is ___."

but thanks for looking that up - I could not find the specifics in my manual and have not yet hooked up the sensor to my laptop (I read the mVs through the ALDL output and Datamaster)

 

Okay, I've been investigating and realized a few things:

The "narrowband emulator" from the LC-1 has the AFR/Lambda ranges setup as follows...
1.000volts = 0.958 L = 14.08 AFR
0.100volts = 1.021 L = 15.01 AFR

** I'm assuming a linear Lambda change- which I think is right. So that means that, by using the narrowband function of the LC-1 it will not read more rich than 14.08 AFR... thus, my ~970mV sensor returns through the ECM are likely accurate - which THEN means I'm way lean under WOT conditions (which explains why I can't run more than 20* advance... lol).

So I plan on adjusting the analog channel 1 through the LM Programmer to reflect a broader range of mV readings, while keeping stoich at the 450mv switching point yet still allowing me to read the AFR through Datamaster log sessions. This is important, because I can only datalog OR use the LC-1 logworks monitoring software, not both at the same time. I plan on doing this:

1.000volts = 12.01 AFR = 0.817 Lambda
0.450volts = 14.70 AFR = 1.000 Lambda
0.100volts = 16.40 AFR = 1.116 Lambda

And this would give me a range of 12-16.4 AFR while keeping the "flip" point of 14.7 AFR at the stock mVolts so the ECM will continue to read properly. Although I may lose a little resolution in reading the AFR this way, the wider range should be more useful I think.

Any problems with this or did I finally do something right?

 

If you run closed loop you the ECM will swing the AFR much more than stock because it is going for a hich and low voltage.

If you disable close loop, then it is ok.