In a typical application, the turbocharger is sized to balance its turbine’s power delivery timing with engine needs. The larger the turbo compressor, the longer the lag before it kicks in to offer more power. Often this compromise means that the turbo is too small to operate efficiently at very high RPM. At high RPM rates, these turbos often shut down and more fuel is pumped into the engine to compensate and allow the turbo to cool down.
Companies like Volkswagen and Mercedes-Benz have developed two-stage turbochargers that use an electric motor to spin the turbo’s compressor until the exhaust gasses can catch up and take over at higher speeds. These dual-stage turbos are limited by the physics involved, as a small motor can only spin a compressor of a given size. Thus the aforementioned balance to size versus heat remains.
https://newatlas.com/garrett-turbo-promises-more-power-and-efficiency-less-lag/
Companies like Volkswagen and Mercedes-Benz have developed two-stage turbochargers that use an electric motor to spin the turbo’s compressor until the exhaust gasses can catch up and take over at higher speeds. These dual-stage turbos are limited by the physics involved, as a small motor can only spin a compressor of a given size. Thus the aforementioned balance to size versus heat remains.
https://newatlas.com/garrett-turbo-promises-more-power-and-efficiency-less-lag/