BorgWarner Turbo Systems says it has developed a new ‘K04 Twin-Scroll turbocharger’ which will be used for the first time in a spark-ignition engine with direct fuel injection and turbocharging. The engine will be launched soon onto the US market, the company says.

In this market, BorgWarner sees a high potential for vehicles that need powerful, yet fuel- and space-efficient engines. The company says the  turbocharger ensures immediate engine response while providing ‘excellent’ fuel economy and low emissions within an extremely compact design. At 194 kW (260 bhp) and 353 Nm (260 lb.-ft) the 2.0-l Turbo engine provides approximately the same performance as larger V6 units but with better fuel economy, BorgWarner claims.

The K04 Twin-Scroll turbocharger from BorgWarner Turbo Systems also features an integrated blow-off valve and a high efficiency turbine wheel. The Twin-Scroll turbine design further ensures that exhaust pressure pulses are effectively utilised at low engine speeds, thus optimizing the ratio between charging pressure and backpressure. The boost effect from the Twin-Scroll turbocharger is evident as low as 1400 rpm and ensures optimum response even at low engine speeds.

Steve McKinley, Director — Business Development Passenger Car Turbochargers — North America, said that, “with this innovative development, BorgWarner Turbo Systems is making a valuable contribution towards improved fuel economy, reduced CO2 emissions and best-in-class performance for direct-injected gasoline engines around the world.”

Recently, BorgWarner worked with Audi to develop the world’s first gasoline engine to use both direct injection and a turbocharger, the Audi 2.0-litre Turbo FSI. The engine was in the new Audi A3 Sportback, and is now available on the Audi A4, the Golf GTI and the Passat. The Volkswagen Group also recently presented the first dual-charged, spark-ignited engine in the VW Golf 1.4 TSI. Here too, the K03 turbocharger, with its integrated exhaust manifold and blow-off valve, was supplied by BorgWarner Turbo Systems.

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