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Giving turbocharged engines a boost - with water

The BMW M4 GTS coupe. BMW is testing Bosch's WaterBoost technology, which could enhance turbocharged engines for passenger cars by improving fuel economy with no reduction in power.

New York

FOR decades, carmakers have relied on turbocharging, which uses energy captured from exhaust gases to force additional air into the cylinders, to increase the power and efficiency of some petrol engines.

But turbocharged engines are in a bind, caught between increasingly...