VE / MAF scaler?

[SSpdDmon]

I think it's come up in a couple of spots where people have said there is a scaler or a factor that the PCM adjusts as airflow variance changes between calculated (VE) and measured (MAF) airflow. Is it possible to log this scaler so we can see where the VE and MAF calculations are off? I've looked down the long list, but didn't find anything that looked like this. If it's not there, can we add it? It might help close the gap between MAF and VE when running both.

Thoughts? :nixweiss:

[redhardsupra]

cant you just calculate airflow from the VE and compare it to maf?

[SSpdDmon]

If the PCM is already doing the calculation (with the charge temp blending and all), I'd rather just see what the scaler is at. Assuming VE=MAF, the scaler should be at a neutral position. Problem is, as airflow drops off, I'd expect the scaler to move due to MAF inaccuracies below a certain point. I'd like to observe all of that...real time if possible...the way the PCM is calculating it. Ideally, that would mean a '_DMA' pid.

[SSpdDmon]

The reason is I'm trying to back fill the VE table using the MAF/IFR tune I have setup and the calc.ve pid that I mentioned in the other thread. Down low, my MAF is dumping in too much fuel. So, I'm trying to get a feeling where the VE and MAF equal and where they start going their own direction.

[ArKay99]

Did this die? I'm +1 with this, if there is such a table/scaler it would be helpful.

[Redline Motorsports]

Might be off topic but.....what does the formula look like that includes the IFR value to calculate fueling? Reason being as I am still surprised how powerful that table is to control fueling.

[redhardsupra]

Might be off topic but.....what does the formula look like that includes the IFR value to calculate fueling? Reason being as I am still surprised how powerful that table is to control fueling.

FUELMASS=IPW*IFR*AFR