Schlechterer Motorwirkungsgrad nach Tuning? | Posts 32+

ObenbeiMutti wrote:

That is interesting. Let's say hypothetically: The vehicle could have larger nozzles with slightly higher injection pressure, resulting in the same atomization, and the injection duration would not deviate from the standard. The turbocharger delivered linearly more pressure relative to its torque output. This means the combustion would be just as good and efficient as with a standard setup (perhaps even better, because everything happens at a higher molecular density). Then: -If only the engine had a higher efficiency! Since it hasn't been physically modified, and assuming internal frictional forces and losses due to bearings and auxiliary components remain constant, this means that proportionally more power is available for use on the road. To what extent can this be included in the measurement, or if at all, were we talking about the third decimal place behind the comma of a percentage of the overall efficiency?

Regarding a better efficiency when tuning, I can spontaneously think of only the higher wall heat losses and the increased flow losses (air consumption) at the higher mass flow rates, combined with the assumptions you mentioned.
I believe that these factors are not as significant, and with your assumptions, I could practically and measurably envision the same level of effectiveness. However, theoretically, it's impossible because every small detail matters.