Intercooler and exhaust gas recirculation have been optimised

The new turbocharger system is perfectly complemented by an intercooler that has been enlarged compared to the previous series-production version and now lowers the temperature of the air - that has been first compressed and therefore heated up - by around 140 degrees Celsius, allowing a greater volume of air to enter the combustion chambers.

After the intercooler, an electrically controlled flap ensures precise regulation
of the fresh air and recirculated exhaust gas. So as to optimise the quantity of exhaust gas recirculated and thereby achieve high recirculation rates, the exhaust gases are cooled down as required in a powerful heat exchanger with a large cross-sectional area. This combines with the HFM (hot-film air-mass sensor) modules, which are integrated into the fresh-air supply and provide the engine management unit with exact information on the current fresh air mass, to bring about a substantial reduction in nitrogen oxide emissions. The results are highly impressive: efficient engine warming, reduced emissions when engine is still cold due to warmer combustion temperatures, reduced emissions when engine is warm thanks to good EGR compatibility and good EGR cooling, no tendency for deposits to build up, as well as a long service life. The engine can be started at temperatures as low as approximately zero degrees Celsius with no preglow waiting period, while the effective turbocharging technology ensures that the engine runs stably without misfiring even when cold.