I've got my brother's astra h 1.9cdti (150) to attempt to tune. I have the full bdm and have managed to find a damos that works but this is more of a general question really;

I made the spreadsheet as instructed on vagecumap on youtube, took me hours and then I went and deleted it somehow so I'll have to re-do it but it's based on I.Q and not lambda. Is it as simple as just converting lambda to I.Q and then the process is the same? Is there a better way?

use factor 0,01455 to turn lambda values to AFR values , then just divide MAF (from axis) with AFR to get IQ in mg
BR