It would be interesting to research how real pilots used the supercharger stages on various WWII aircraft.
I am an expert on internal combustion engines and I know that in the real world a supercharger increases cylinder pressure. Aircraft use them to make up for the lower air density at higher altitudes.
In a real combustion piston engine running too much boost the fuel detonates instead of burning smoothly and it quickly destroys the engine. Guys that drag race automobiles or run a mechanical supercharger on a street car can buy different sized pulleys to vary it's speed and boost, and exhaust driven turbochargers use a waste-gate to bleed off pressure and keep it below a certain setting.
The automobile only has to run at one altitude usually so it does not have to vary it's boost as much as an aircraft would. Mixture also has to be manipulated along with boost, either automatically or manually, so if you have too much air forced into an engine and the mixture control does not compensate for it then the engine will lean out, overheat and again detonation and pre-ignition will set in and destroy it quickly.
The IL2 aircraft have some mixture, boost and prop pitch settings that can be manipulated for better performance, but they are much more forgiving and uncomplicated than most real-life engine management jobs be they automatic or manual.
I used to have a 60s Mercedes with Bosch mechanical fuel injection, basically what was developed and used for the WWII german fighters, it is a little mechanical marvel.....as were all the WWII aircraft parts.
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