New Audi SQ7 boasts electric turbo and 48-volt electrics for efficiency

Given the diesel scandal lingering over Volkswagen’s operations, it might come as a surprise that Audi has unveiled a new, high-performance flagship crossover powered by the controversial fuel.

But the new SQ7 brings to the table much more than just a high-power 4.0-liter twin-turbocharged diesel V-8 engine.

Among the model’s numerous highlights is an electric compressor that spins at up to 70,000 rpm to supply boost so quickly that the lag endemic to turbochargers is largely negated.

The electric compressor is positioned downstream of the intercooler and close to the engine; it can supply full pressure in just 250 milliseconds. Unlike rival BMW, which uses three turbochargers, the Audi’s compressor supplements its two exhaust-driven turbos.

In real-world use, Audi says that the benefit is genuinely instant torque. On paper, the output is 663 pound-feet of torque from 1,000 to 3,250 rpm, and 429 horsepower from the engine.

The downsized V-8 uses a new common-rail

... read more at: http://www.csmonitor.com/Business/In-Gear/2016/0308/New-Audi-SQ7-boasts-electric-turbo-and-48-volt-electrics-for-efficiency