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First Drive: 2016 Nissan Titan XD(2)

Time:2018-04-21 19:59Turbochargers information Click:

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Of course, the most notable aspect of the new Titan XD is the powertrain. Since 1919, Cummins has been one of the most respected names in heavy-duty diesel engines and shares symbiotic partnerships with several manufacturers. While the Titan XD’s new engine – built in Indiana and weighing only 362 kilograms – is considered one of their “baby” engines, it shares the same long block as those found in commercial vehicles with a 13,607-kilogram GVWR (gross vehicle weight rating). It’s paired to a heavy-duty six-speed Aisin transmission.

2016 Nissan Titan XD

2016 Nissan Titan XD

2016 Nissan Titan XD

The 5.0-litre V8 features a lightweight and compacted graphite iron block, aluminum heads and composite valve covers. It has an output of 310 horsepower, but more importantly, 555 lb.-ft. of torque at 1,600 rpm; that’s 45 per cent more torque than the gas-powered Titan. The flat torque curve is mostly the result of a new Holset two-stage turbocharger system, designed specifically for the Titan XD.

As much as Nissan would undoubtedly would love “twin-turbo” bragging rights, Cummins’ Steve Sanders explains there are technically two turbos, but “they don’t function as a traditional compound system with a turbo on [either] bank,” with the first one continuously feeding the other.

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Behind the smaller, high-pressure turbo hides a larger one. They function as a sequential unit, with one initiating startup. Between the two, a rotary valve “diverts the exhaust gases from the first turbo, then to both and then finally cuts off the first,” so the second turbo is carrying the load. The system virtually eliminates turbo lag and ensures immediate power delivery for smooth towing.

Of course, one of the drawbacks to diesel powerplants is the tell-tale clattering – not exactly a desirable feature for a vehicle that’s doubling as a daily driver. The 5.0-litre’s block was designed to reduce noise, vibration and harshness, but another Cummins innovation results in a virtual elimination of any typical diesel noise: a new injection system created especially for this engine fires small bursts – five per cycle – during combustion so that the piston travel through the cylinder wall is smoother and less abrupt. The fuel pump is also sequenced with the combustion cycle, which covers up any noise produced by the pump.

2016 Nissan Titan XD

2016 Nissan Titan XD

2016 Nissan Titan XD

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