For Proton’s new engines, this means working towards the forthcoming Euro 6C standard.At low engine speeds, where the engine is turning at or near idle, the ECU sets the engine up for an ultra lean burn. In normal running, the ECU will set the GDI to as close to the stoichiometric ratio as possible, which in theoretical terms is 14.7:1 of air to petrol by mass.While perfect combustion is never achievable in the real-world, the engineering push towards this goal will result in better fuel efficiency and controlled emissions. Typically, a GDI engine will work in one of three modes. Other automakers followed suit through the 2000s, with BMW even trying out a low-pressure GDI in its V12.According to Proton, its GDI engine will give a fuel savings of 25% over the previous VVT engine in the Iriz.
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