It should sound like a more revy version of the turbo era V6, you got to keep in mind those cars where only pulling 600-700hp in race trim and had around 10-12k Rpm.
Let’s start with the most intriguing aspect, which is of course the fuel flow rate limitation. The upper limit is set at 100 kg/h, and below 10,500 RPM the fuel mass flow must not exceed the amount of Q (kg/h) = (0.009 x RPM) + 5. This means, that the fuel flow tops up @ 10,500 RPM and has the linear graph shown below. Of course, the curve below represents the maximum allowed fuel flow in all circumstances and does not represent the actual flow graph, which will be considerably different.
they do, at least on that Renault engine. Its on the first pic in my post above. They do this for years already on truck engines.
Mercedes may go another route, my professor in combustion engine technology told us about thermoelectric elements that can generate electricity simply from heat that are being developed atm