• + Fuel efficiency meets power in the Jaguar XF
  • + Valve innovation drives dual-stage technology

Double Dynamic From Dual-Stage Turbo

Posted 08.12.2009

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The Jaguar XF. It’s the diesel car that’s winning media plaudits around the world – and it’s boosted by a Honeywell turbo innovation that helps transform the dynamic between performance and fuel efficiency. The XF is powered by the all new 3.0l AJ-V6D Gen III 3 engine, an impressive unit that is delivering gains in power and torque of up to 33 percent and 38 percent respectively over its 2.7l diesel predecessor.

The Best of Both Worlds

The performance is stunning, yet the two diesel options – the 600Nm or 500Nm versions – deliver a combined average fuel consumption of 42mpg, a 12 percent improvement, while CO2 emissions are reduced by 10 percent.

This remarkable improvement in performance is enabled by the Honeywell Parallel Sequential Dual-Stage technology – the first system of its type to be fitted to a V-engine.

The boosting system consists of two turbos working sequentially, controlled by patented valve technology and optimized for a V-Engine configuration. The primary VNT™ turbo provides boost at low engine speeds, maximizing driveability and fuel economy, while the second turbo, which is free-floating, is activated in parallel at high engine speeds to deliver best-in-class peak power.

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Ron Lee, Jaguar Group Chief Engineer, Powertrain, appreciates the contribution made to the Jaguar program by Honeywell engineers.

He says: “The new parallel sequential turbocharger system on our new V6 diesel delivers V8 levels of performance from very low revs. It’s a power unit that offers superb flexibility and remarkably low fuel consumption and emissions, while building on the refinement that has become a trademark of our Jaguar diesel engines.”

What’s particularly innovative about this parallel sequential dual-stage architecture is Honeywell’s patented Valve Turbine Cartridge (VTC), which brings new levels of sophistication to the control of exhaust gas flow to each of the two turbos.

The result is a system that helps to deliver 500Nm of torque in only 500 milliseconds from idle. At low engine speeds, the VNT™ also drives the high levels of Exhaust Gas Recirculation that contribute to emissions output of just 179g/km of CO2 – which conforms to Euro V standards ahead of the 2011 introduction.

The Best of Both Worlds

“VTC effectively channels optimum levels of gas flow to each of the turbos precisely when it’s needed, boosting engine performance while setting new standards in fuel efficiency and emissions output,” says Mark Norton, who led the Honeywell program team that included Honeywell engineers co-located at the Jaguar engineering facility in Dagenham, UK.

“This dual-stage system – and particularly the integration of the VTC – raises the bar significantly for sequential turbocharging,” says Mark. “It’s an architecture that has come of age and one that looks set to become increasingly in demand as OEMs focus on performance, fuel efficiency and emissions reduction.”

Photo Credit: Alain Ernoult, Jaguar