Formula 1 engines also have another motor/generator, this one dubbed MGU-H, for Motor Generator Unit–Heat. This motor is coupled to the engine’s single large turbocharger and delivers no torque to the wheels. In the Mercedes, the MGU-H develops 107 horsepower with a minimum weight of 8.8 pounds and serves two purposes. First, it is used to keep the big turbocharger spinning at high speed to provide instant throttle response with no lag, i.e. anti-lag, without injecting extra fuel and a secondary air injection. Second, it can generate electricity, when the exhaust turbine is producing more power than needed by the compressor. Rather than bypass the excess exhaust flow with a waste gate, the MGU-K absorbs the additional energy to help charge the battery, although a conventional waste gate is still part of the system. On the Mercedes engine, the turbocharger’s compressor and turbine wheels are located on opposite ends of the little engine block, with the MGU-H inserted between them on one long shaft.
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