Check this out:
https://www.motorauthority.com/news/...-racing-engine
Quote:
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One way engineers were able to extract more efficiency from the powertrain is by using a motor-generator unit heat, which recaptures waste heat from the exhaust and converts it to electric power. That wasted exhaust heat spools up a compressor that spins an electric motor, which sends electricity to a battery that powers another electric motor to add torque to the rear wheels. Mercedes also pioneered the split turbocharger, which keeps the unit cooler and allows the car to use a smaller intercooler design with less intake piping.
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Exhaust heat recovery works, but it's typically some combination of complicated, heavy, large and expensive. I'm guessing with the Mercades F1 unit, it's mostly complicated and expensive.