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Arguably the most compelling enhancement is two-step VVL. The system is designed to remain mostly in low-lift mode until the customer demands more power; then it responds by switching to high-lift mode for improved combustion.
The result is less overall pumping work, which on its own, accounts for a fuel-economy improvement of up to 2.7 percent, compared with the 3.6-liter Pentastar’s previous iteration, named three times to the prestigious annual list of Ward’s 10 Best Engines.
The addition of cooled EGR firmly establishes the redesigned Pentastar among the V-6 elite. In addition to the obvious emissions-reduction benefits, the system further cuts pumping losses and enables knock-free operation at higher, real-world loads.
This translates to a fuel-economy improvement, on its own, of up to 0.8 percent.
Pumping losses are again targeted with the engine’s upgraded Variable Valve Timing (VVT) system. For 2016, it moves to torque-driven cam-phasing, which reduces oil demand.
The new VVT system also increases its range of authority to 70 degrees, from 50 degrees. This helps mitigate knock during hot starts and expands the operating envelope of Engine Stop Start (ESS), a fuel-saving feature that is carried over from the previous-generation 3.6-liter Pentastar.
ESS is driven by a high-speed/high-durability starter that reduces crank time for quicker restarts.
The system is regulated by algorithms, which act on the vehicle’s powertrain and chassis components.
As a result, acceleration is always aligned with driver inputs. Passive accelerator application is met with measured throttle response; hard inputs trigger aggressive starts. And there’s no waiting for either.
The same can be said for torque. More torque is delivered more quickly by recalibrating the VVT system to leverage the benefits of the new intake manifold’s longer runners.
The result is a torque boost of more than 14.9 percent, depending on the vehicle application. And this occurs between 1,000 and 3,000 rpm – engine speeds most customers see very frequently.
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