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Originally Posted by stealthn
I liked the race good driving by you know who.
One thing i would like to know is how do they use the KRS to spool up the turbos?
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They don't. They use the MGU-H.
Mercedes has split the hot and cold sides of the turbo with an electric motor in between, mounted on the shaft. When they reach their boost limit the electric motor acts as a generator so no wastegate, the exhaust energy gets converted to electric energy. This can then be sent directly to the KERS motor to add torque to the wheels, or it can be sent into the battery.
To spool up the turbo the ERS-H (heat) works as a motor instead of a generator. It uses energy from the battery to accelerate the turbo shaft.