I don't know why people call this car a mild hybrid when it has a motor generator this big:
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The battery is also the size of a strong hybrid battery
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My theory is that the development troubles are more than the chassis and engine. The hybrid system as we see in its current form is also a placeholder. The motor generator is sized for a PHEV application (too big for MHEV/HEV), the battery is in between a HEV and PHEV, and there's no charging port either. The ESU looks really primitive (even larger and taller than the latest RAV4 PHEV's unit) The current power specs only include the ICE and no detail for the hybrid. The dashboard also lacks a battery charge meter. But the steering wheel has a "sport boost" button which I assume allows the driver to manually request hybrid power.
The way I see it, this GR GT/LFA announcement is a paper launch. The production car is still 18-24 months from release. It's mostly to assure their GT3 customers that they will have a new race car in 2027.