Bf 109-G DB605A engine critical height

[the_emperor]

Hey there,
according to manuals, climb- and engine charts the critical height for the 109's DB605A engine is rated at approx.5.4 - 5.7km in climb (at 350kph TAS so ~280kph IAS?) and 6.4-6.6km in level flight for Steig-und Kampfleistung (1.3ata/2600rpm).
Unfortunately my engines in the 109Gs with DB605A start to loose boost in climb at around 3000m with the DB605A at 1.3ata/2600rpm.
And I seem to have the same issue with the DB605AM. Its critical height in climb is ratet at approx. 4000m with Notleistung (1.7ata/2800rpm) and 5000m in level flight, but boost pressure starts to drop at around 1000m in climb.
So my questions: is there a special engine setting I am missing except pushing the throttle to the desired ata/rpm setting or did I missread the technical manuals and charts for this plane?  I am not that familiar with the 109 models and just getting used to them since I mostly fly Spitfires.
So far only tested on summer maps (should there be a difference between summer and winter for the engines critical altitude?).
Thanks for your help.
Cheers

Edited April 16, 2020 by the_emperor

[LLv34_Flanker]

S! 

 

Finnish test report show the boost line was a straight line up to 5.7km in the Bf109G-2 and after that started to drop off. Boost was limited to a maximum of 1.31ata. 

[the_emperor]

Hey there :)

Yes, that is the probleme I seem to have. German Reports on the Engine in Climb show critical altitude at 5.4-5.7km with ~280kph IAS for 1.3ata/2600rpm but I lose boost pressure at around 3km in climb.