Issues with MAF calibration

Looking for some advice to do with MAF scaling I'm attempting at the moment; I've been following these courses for a little while now and feel like i have got a decent understanding of it now. However, i was giving it a go today and came across and issue, i setup a graph in VCM scanner for Equivalence ratio error to mass air flow frequency and could not for the life of me get any data to populate the graph. Upon some further digging i found a similar forum thread asking a similar question to mine, and Andre had replied saying the EQ Ratio Error {Math} parameter requires an external wideband input to be used. I don't have access to the means to set one up at this stage.

Is their any alternate parameter that can be used through OBD that can still be used like EQ ratio error to aid in scaling the MAF?

Car info is:

(Australian) 2014 HSV Senator 6.2L V8

Bone stock apart from an OTR (Hence the MAF rescaling being needed)

Any help would be much appreciated

In closed loop, the short + long term fuel trim can be used to determine how to correct MAF scaling.

In open loop, the short term trim stops operating so that's not an option.

In some applications long term fuel trim also stops, or doesn't stop but isn't correct at high load/RPM, so again that's not a solution to optimize MAF areas encountered in open loop.

In open loop fueling areas found at higher engine load and higher MAF frequencies, MAF scaling adjustment is performed to reduce the difference between the target air/fuel ratio, and the measured air/fuel ratio. That's what Andre is referring to.

Wideband air fuel meters (one per bank on that engine), are needed to know what the measured air/fuel ratio is.

Without knowing the air/fuel ratio the engine is operating at, you can't perform MAF scaling or power enrichment tuning at high load. You'll need that tool to do the job.

Thank you for your reply mike.

I have access to the AFR through the dyno graph, is it possible to manually look at the dyno readout after a WOT throttle pull and reference that to adjust MAF scaling?

To me this doesn't seem like a good way to go about it. My thoughts is that this would be super tedious and not the most accurate way.

I don't see any way to sort of piggyback the wideband sensor from the dyno into HP tuners if anyone does know a way to do this thought that would also be useful.

Perhaps you can get your Dyno Wideband outputs connected to your MPVI Interface, either through the CAN bus (emulate one of the CAN Wideband modules this is supported), or using an analog voltage input (poor second choice).

Or improve your setup with a wideband controller (ideally a CAN one supported by HP Tuners) that you temporarily install in cars you want to tune on the dyno.

Doing the math post run is certainly possible, some dyno's even have tools that will calculate the % change needed.

+1 for David's suggestions since they are more ideal.

Or yes if you have RPM lined up well on the dyno so it is correct, then you can visually look at the wideband data, see how far off you are from your ECU logged lambda target at each RPM, and then make your adjustments.