Originally Posted by
redhardsupra
I've done that, you can calculate the entire VE table from MAF, or vice versa. It's very simple, you can just do it with histograms. You set up a MAF calibration-like table, except for the airflow data you use not MAF data, but the results of the SD calculations.
getting VE out of MAF is a bit more complicated, but you start with setting up a VE-like table, and then for data you must use a custom pid, that takes MAF airflow (which is a lookup, and if it's calibrated correctly, then it's a correct lookup), and using the SD equations you can calculate VE (or GMVE) out of it. It's basic algebra, and it saves you a boatload of time. There is no need to calibrate the two tables separately. Although, doing it independently is a nice verification that both calibrations are correct, because if the resulting airflow from the two methods varies in a non-trivial manner, then you screwed up somewhere.
The one thing I'd like to work out in the future how to use both sets of data to figure out the cleanest data to use for the calibration. If we got two airflow estimators, why not use them both, and limit ourselves to just one of them? Any ideas?