how are these 109s turns 180 with out penalties?

[ACE-OF-ACES]

The only thing we can say with any certainty is that no one has yet posting anything that would/could be remotely considered as proof either for or against the realism of the Bf109 FM

Due to the limitations of the human sense observations from the plane itself, or worse yet, the opposing plane consist of too many unknowns to say with any certainty..

Unless the values are way off..

For example a Bf109 climbing straight up for 20kft like an F15 is an error the human senses could detect.. But the human senses are not good enough to even begin to quantify the error (say how big the error is)

That is the reason plane makers more so than not go to all the trouble of instrumenting a plane to 'measure' the variables during the test flight.. As opposed to relying solely on the test pilots real time (radio) or memory of the flight

With that said

When testing how realistic an FM is you need to do the following three things as a 'minimum'

1) Know what the real world values should be for a given test flight.
2) Be able to reproduce the test flight method and reproduce or account for the configuration used during the test flight.
3) Log the same or equivalent in-game data while reproducing the test flight in-game.

Than and only than can you say with any certainty how realistic the FM is..

And know that the acceptable rule-of-thumb error between the real world data and in-game data is about +/-5%

Note.. you will be hard pressed to find any real world data on the energy state or power of a Bf109 performing a 180°! Thus failing one of the three minimum requirements for a test. At which point you would have to 'calculate' in advance what the values 'should be' but that in and of itself can be a real can of worms. Thus it is best to limit your FM testing to the types of testing they did in WWII, in that you will stand a much better chance of finding some real world data to compare to.

Anything less than that is just opinion at best

PS you can log data in CoD using C#