Maybe aircraft engines? But no it literally makes no sense to build turbo engines that rev that high, since you can get enough oxygen for combustion at relatively low revs. I guess you could harvest stupid amounts of energy from an MGU-H at 18 000RPM though, since you basically have no use for the turbo at such high revs. I guess an 18 000RPM turbo engine would be running with a fully open wastegate/harvesting MGU-H at 18 000RPM and would only use it at lower revs.mzso wrote: ↑Thu Sep 12, 2024 12:31 pmDid anyone ever make a 18k+ reving turbo engine for a car (or anything really)? Is there any technical reason to have done that?bananapeel23 wrote: ↑Thu Sep 12, 2024 12:15 pmObviously yes, but if your choice is to remove the turbo to get the noise back or to suffer more friction losses with forced induction, the choice is obvious from an efficiency standpoint. A turbo engine will always be more efficient.
It would probably still be more efficient than an NA engine running 18k though, since you would be able to harvest with an MGU-H and benefit from the turbo at low speeds. But I have no clue if a turbo engine could even survive 18k with fuel flow capped at 100kg/h. I feel like it would basically be running so lean it would eat itself alive, and fuel flow can't really be increased without the engine power getting out of control. You would probably have to reduce the displacement in order to make it survive at 18k RPM.
(I have a very poor understanding of how an ICE works)