When I developed the mode for a car, I visualised the operations in my head but the details are sketchy. Now, the process is clearly defined in the link below and the names of the phases identified.
The zero aerodynamic drag principles, utilise the internal combustion engine as the vacuum pump and air compressor to neutralise the aerodynamic drag, but at the same time, increase the efficiency of the ICE engine.
You have double benefits.
Interesting comments from the article:
The intake stroke, a-b, uses negative work. It does not have to. You can increase pressure to push the air into the cylinders so there is no work (mechanical energy, provided by the engine), required from the engine.
In fact, if the pressure is high enough, it can provide positive energy. Imagine a high enough air pressure that can push the pistons by itself.
This high pressure is provided by the aerodynamic drag, which manifests itself as the onrushing air.
As I had suspected, the higher intake pressure or manifold pressure, will result in more knocking, or misfiring. It is solved by methanol injection or high octane rated fuel.
https://youtu.be/sTD7DqXfRno
https://x-engineer.org/automotive-engineering/internal-combustion-engines/ice-components-systems/pressure-volume-pv-diagram-work-ice/