Okay, I remembered last night that I read something 5+ years ago about an anti-lag system in rally cars which does something similar to what you are suggesting happens in the BS. Maybe this is enough to convince you that it is rarified and not the norm.
Here is the article, and here is an excerpt:
Here is the article, and here is an excerpt:
But the engine's electronic control unit modifies the engine management. What it does is to delay the spark plug ignition point as much as possible. Thus, when the engine piston is already in its expansion stroke is when the mixture is set on fire. This causes the vast majority of the energy from that combustion to be propelled through the cylinder on the exhaust stroke, which sends the burning mixture and all that energy to the gas turbine. In addition, those gases are mixed with the high-pressure air coming into the exhaust manifold from the intake turbine.
In this way, the turbo still has energy in the form of high-speed, high-temperature exhaust gases, so it continues to compress air at high pressure.
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