Spit Mk1 Boost?

[=XIII=Wedge]

Realism in IL2-Cliffs of Dover
"The flight sim we've built in Cliffs of Dover is much bigger than anything we've built before. We made it more realistic in every respect: graphics, plane models, physics, aerodynamics, weapons, customisability, and more."
Ilya Shevchenko - Pilot's Notes - Special Edition

The goal of greater realism is one the development team share.

For example, if the game currently modelled the Spitfire Mk 1A with 2 x 20 mm Hispano cannon, I would conclude that this was an genuine mistake on the part of the developer and raise it as a bug. If the developer then responded that this was by design then I would not be interested in using such a sim, they might might as well have modelled X-Wing fighters instead.

Also what would be the value in modlling different models of the same aircraft, not just the different marks, but even down to different propellors.

The fact is they wouldn't if they did not intend to strive for greater realism.

Whilst we can all discuss the merits of various sources regarding aircraft performance, ultimately it is down to the developers to decide on what parameters they want to use.

However if they did not want to strive for realism then it seems strange to spend time developing and engine to model so many features. If realism was not a goal then a simpler engine design would suffice saving time and money.

Whilst FM discussions are difficult, some elements can be modelled with a reasonable level of realism, hence...

Back to the Boost Cutout
So getting back on topic we end up with a couple of questions

Given a Spitfire Mk1A with with an unmodified Merlin III engine using 87 octane fuel.
When the boost cutout is engaged
Then what behaviour is expected? (as intended by the developers)
And how does this correspond with actual behaviour observed in the current version of the game.

Another question is what would the actual effect be on a real 1940's Spitfire?

The first question is easy for the developer to answer, the second is something that I am interested in from an understanding point of view.