Method and apparatus for operating an internal combustion engine with an exhaust gas turbocharger

The method involves deriving an exhaust gas counter pressure from the condition that the quantity of exhaust gas flowing into a volume (20) between at least one exhaust valve (25) of the internal combustion engine (1) and a turbine (5) of the exhaust gas turbocharger (5,10,15) is equal to the quantity of exhaust gas flowing out of this volume. An independent claim is also included for the following: (a) an arrangement for operating an internal combustion engine with an exhaust gas turbocharger.