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Details Input of exhaust gases from the manifold, at a temperature approaching 700ºC. Exhaust gases are used to drive the conventional turbocharger, where energy is used to boost power and torque in the combustion process. These exhaust gases, instead of being lost to the atmosphere, are then directed to the turbocompound unit. The exhaust gases, on reaching the turbocompound unit, are still at a high temperature (around 600ºC); the energy is used to spin the second turbine at up to 55,000 r/min. After passing this point, the gases are down to below 500ºC, and are expelled via a conventional exhaust system and silencer. The revolutions of the turbine are stepped down in various stages by mechanical gears and a hydraulic coupling. The hydraulic coupling balances out variations between the rotation of the flywheel and the turbocompound turbine. By the time drive reaches the crankshaft, the rate of rotation is down to around 1,900 r/min. The flywheel's momentum is increased, and its rotation becomes more stable and even.