Honeywell has announced the launch of the world’s first diesel parallel sequential dual stage turbo system, which makes its debut on the 4-cylinder engines of PSA group’s Peugeot 407 and 607, and the Citroen C5 and C6. The new turbo system will be on display at the 2006 Paris Motor Show at Honeywell Turbo Technologies’ stand located at Hall 4, Stand 128. This latest Honeywell advance represents a new step in two-stage turbo technology, delivering up to 30% more torque over PSA’s 2.2 liter baseline diesel engine and improving third gear acceleration in the 30kph – 60kph range by up to 50%. The 2.2 liter Peugeot HDi diesel engine now delivers full torque of 330 Nm at 1300rpm and 370Nm at 1500rpm, unprecedented in an engine of this size at such low rpm. “We are thrilled about what this innovative dual-stage technology could achieve for PSA,” said Alex Ismail, newly named President of Passenger Vehicles at Honeywell Turbo Technologies. The development of the new dual-stage turbo system with PSA began in 2003. Rather than opting for a serial sequential turbocharging configuration, where a smaller high-pressure turbo works in advance of a much larger turbo, PSA and Honeywell selected for this engine platform the parallel sequential arrangement where two small turbos work side by side at high rpm but only one turbo delivers the torque at low rpm. What makes Honeywell’s parallel sequential dual-stage turbo technology so effective for PSA is the specially-designed and patented progressive control valve that accelerates the second turbo even when it is idling during the first engine phase. Pressurized air from the first turbo is used to avoid any likelihood of oil leakage. The system also includes a position feedback sensor which is controlled by the Engine Control Unit. Honeywell is also developing serial sequential dual-stage turbo system expected to be introduced around 2007, and is thus able to provide both parallel sequential and serial sequential solutions.