BorgWarner suggests Valve-Event Modulated Boost system can offer 6-17% fuel economy benefit over already downsized and turbocharged engines
Green Car Congress
MAY 9, 2012
Turbo boost can be controlled by changing the timing of the exhaust valves—no waste gate is required. VCD uses Cam Torque Actuated (CTA) phasers with Mid Position Lock (MPL) that can phase the camshafts fast enough with enough range of authority to achieve virtual cylinder deactivation. VCD can deliver about a 4.5%
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