RomRaider

How's this log?

That's great, thanks.

The CL target AFR does not fluctuate. I'll have to check mine...

The AFR does fluctuate, but not as much as mine, and it fluctuates randomly where as mine fluctuates very predictably. So now I'm curious whether the difference is due to the O2 sensor position (steady oscillations would be no surprise due to the longer time it takes for the sensor to read a change) or whether it's by design.



The X-axis is time in milliseconds.

I'm not sure if this makes a difference, but I have GT SpecII UELH on the car which is a 4 into 1 configuration. The "stock" O2 sensor position is in the 4-1 coupler and inline with the cyl #3 pipe.
The log was taken at 24C with no A/c on, but the engine fans may have cycled...
If I can manage my time this week and up coming weekend I should be able to get my WB02 installed finally. I can then make another log comparing the stock location and the WB02 in the DP before the cat. Would that be of any interest to you?

I think there's already a comparison of them out there somewhere, but another couldn't hurt. But note that if your stock sensor is reading 11.1 most of the time you're in boost (due to the true AFR being richer than that limit), the comparison won't be very useful.

If you tune your AFRs to be lean enough to not be below the stock sensor's limit, then it gets interesting. I'm not sure whether or not that's a good idea though.

If you do log both, please log boost along with the two O2 sensor values, I'm curious if the difference between the sensor values is proportional to boost.