Hello members,

I have a litte understanding problem and hope someone can help me:
If you have a boost map which allows more turbo pressure than physically needed, didn't that mean the mass air flow runs out the calculated limit?
Let's say at 4000 rpm you can generate 2000 mbar (boost map). So you pump theoretically 2bar * 500mg/stroke per bar = 1000mg/stroke fresh air (MAF) in the engine. But the maximum value in the smoke map is 850mg/stroke. Does that mean the ECU take the I.Q. values for 850mg/stroke MAF and the engine runs a little bit to lean?
Should I add higher values of MAF to the smoke map axis and therefore higher values of I.Q. to boost map axis, too?

I would attach a excel file handling with this topic but I did't reach the 3 post rule, yet.

The ECU takes the last column values when the axis value is exceeded.
Is good idea to increase axis value and then recalculate new column values.

But this example came from a original VAG 1.9 TDI PD.
Is something wrong in my calculation of MAF out of turbo boost or did the engine designers right that (lean @ high boost)?
To my mind it could be interpreted as a safety mechanism: The very lean combustion at high pressures prevents the engine from overboosting. Does anybody agree with this assumption?

For diesel you can add lots of air without danger since you always are burning "lean". If you would use up all the oxygen, you would have a heavily smoking engine. The trick is to not get more air in than you need to properly burn fuel, since you are wasting energy and heating up intake air if you do without any benefit.