I guess that this is common knowledge for most people here, but I have not been able to find the answer anywhere, so here goes.

I am wondering how the algorithm for e.g. the igintion maps works. An example might explain my question better:

KFZW with made up values for simplicity (i know it is 0.75 increments IRL):
....... 5500.0 | 6000.0
150 | 20.00  | 25.00
170 | 10.00  | 15.00
190 | 00.00  | 05.00

An example could be actual load being 160% and the RPM 5500. Would the ECU interpolate the value, so it would read 15?

If yes, then I guess that it would also apply to the RPM axis. E.g. load = 160% and RPM 5750 (interpolation between 15.00 and 20.00) would equal 17.50?

And anything over 190% would just use the values from the last row?

dont think that it uses interpolate algorithm because ecu needs to calc values from thousands maps at real time.. its a very high cpu load

i think it uses last reaching value from table so at 150-169 load from your example you have 20 deg (5500) and only on 170 it switches to 10 and when load are decreasing you have a 10 deg from 170 to 151
thats why stock maps are so detailed

but as i said before - its only my opinion, am wondering if someone can answer exactly how it works

anything higher than map axis point uses last value

Linear interpolation of the row

zw_local isn't written to RAM and cannot be logged. The first variable available for logging is zwnws.