Boost pressure regulator

The chosen design of the turbocharger has the good property that already at a relatively low speed the charge air enters the cylinders, which means that at a high speed there will be too much air in the cylinders. The pressure in the boost system can rise so much that it is already harmful to the life of the engine. To avoid this is the task of the boost pressure regulator (3). It ensures, by opening the valve, that only part of the exhaust gases pass through the turbine wheel of the pressurization system. In this case, the boost power drops and the pressure cannot increase by more than 0.83 bar.

Attention: What turbocharging generally does not like is engine stalling after a long drive at full throttle. This can lead to coking of the system when handled this way: the shaft bearing near the turbine wheel heats up so much due to the sudden influx of heat that all the oil in the bearing burns out and solidifies. The more often this happens, the sooner the turbo will fail.

Therefore, after driving at full throttle for a long time, the engine should be idling for a while. Before replacing a suspected turbocharger, the following systems should be checked and ensured that they are working correctly: injection timing, fuel supply, full load limiter, compression, air filter, and possible leaks in the intake and exhaust tract.