Air Mass Flow Rate - AHU Motor

Hello,

My 66kW AHU is continuously losing airflow from 3200 upm. At 4200 upm, it's only delivering 750 of the 850 m³/h, and at 4600 upm, it's only delivering 650 m³/h. The boost pressure drops already at 2800rpm, which, in my opinion, is normal.

Is this IST value normal or should I be concerned about a clogged/faulty O2 sensor?

Thank you!
PS: The car has 270,000

Here's the log:

[code],Group A: '006,,,,Group B: '003,,,,Group C: '010
,,Steering,Braking,Speed,none,,Engine,Air,Air,Touch,,,Air,Ambient,Intake,Throttle
,TIME,speed,pedal,mat,display,TIME,RPM,mass,mass,ratio,TIME,mass,pressure,pressure,position
MARKER,STAMP, km/h,,,,STAMP, /min, mg/R, mg/R, %,STAMP, mg/R, mbar, mbar,%

,63.41,30.0, 0 0 0, 000000,0.0,62.61,1197,320.0,498.8,43.0,63.01,422.3,999.6,1040.4,0.0
,64.61,32.0, 0 0 0, 000000,0.0,63.81,1176,850.0,498.8,4.8,64.21,515.4,999.6,1071.0,100.0
,65.81,39.0, 0 0 0, 000000,0.0,65.01,1386,850.0,585.2,4.8,65.41,645.1,999.6,1244.4,100.0
,67.12,48.0, 0 0 0, 000000,0.0,66.21,1701,850.0,741.5,4.8,66.66,791.4,999.6,1560.6,100.0
,68.51,58.0, 0 0 0, 000000,0.0,67.57,2100,850.0,847.9,4.8,68.05,847.9,999.6,1856.4,100.0
,69.79,68.0, 0 0 0, 000000,0.0,68.96,2478,850.0,847.9,4.8,69.39,847.9,999.6,1999.2,100.0
,70.99,76.0, 0 0 0, 000000,0.0,70.19,2814,850.0,847.9,4.8,70.59,847.9,999.6,1927.8,100.0
,72.19,84.0, 0 0 0, 000000,0.0,71.39,3129,850.0,841.2,4.8,71.79,841.2,999.6,1866.6,100.0
,73.39,91.0, 0 0 0, 000000,0.0,72.59,3423,850.0,804.7,4.8,72.99,804.7,999.6,1815.6,100.0
,74.62,98.0, 0 0 0, 000000,0.0,73.79,3675,850.0,798.0,4.8,74.19,798.0,999.6,1846.2,100.0
,75.95,104.0, 0 0 0, 000000,0.0,75.09,3948,850.0,784.7,4.8,75.55,774.7,999.6,1795.2,100.0
,77.15,110.0, 0 0 0, 000000,0.0,76.35,4179,850.0,764.8,4.8,76.75,758.1,999.6,1795.2,100.0
,78.35,114.0, 0 0 0, 000000,0.0,77.55,4368,850.0,721.5,4.8,77.95,698.3,999.6,1734.0,100.0
,79.55,118.0, 0 0 0, 000000,0.0,78.75,4515,850.0,671.7,4.8,79.15,665.0,999.6,1713.6,100.0

dermoe wrote:

Is this diagnostic log okay, or should I be concerned about a clogged engine/faulty O2 sensor?

I no longer have the values in my head. But:

Check the fuel injection amounts in MWB 8. If the fuel injection amount at full throttle is always above the torque limit and not above the smoke limit (=consequence of the LMM measurement value), then the LMM is okay. If the amount of fuel injected is reduced below the limit, the LMM needs to be replaced.

Greetings
Guste