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Twin Turbo 1.9 JTD Engines
I found this on GM's website regarding the twin turbo 1.9 diesel unit.
Originally Posted by GM
Depending on the development objective, the twin-turbo can be designed either for high performance or for maximum efficiency in its consumption of fuel. Compared with a naturally aspirated diesel engine, power outputs can be raised by up to 50 percent without increasing fuel consumption. Alternatively, consumption can be reduced by as much as a quarter without loss of power. Opel has chosen the first route for the 1.9 CDTI twin-turbo engine used in the Vectra OPC study. This high-tech engine delivers a peak power output of 156 kW (212 hp) from just 1.9 liters displacement. The resulting specific power output of 82 kW (112 hp) per liter is a world record, not matched by any turbo-diesel in a standard production car.
Two-stage turbocharging combined with the latest common-rail fuel supply, variable multi-stage fuel injection and twin charge-air intercoolers provide the increase in power and the maximum torque of 400 Nm, which is available over a wide engine-speed range from 1400 to 3600 rpm. With this engine the Vectra OPC accelerates from 0 to 100 in 6.5 seconds; the top speed is an electronically regulated 250 km/h. At 6.0 liters per 100 km in the European test cycle, fuel consumption is at the same low level as the production
1.9 CDTI units, and like these the twin-turbo engine can be fitted with a maintenance-free diesel particulate filter (DPF) that works without additives. Exhaust emissions already comply with the Euro 4 standard for new vehicles registered after January 1, 2006.
Hopefully this will come through to newer Alfa's
Original Article is quite old and the engines took a while to come to market but I believe were first seen in the latest version of SAAB 9-3 about a year ago although in a detuned version. a la wikipedia
Originally Posted by wikidudes
1.9 Twin Turbo
Engine cover of Lancia Delta´s 1.9 TT Multijet.Fiat Powertrain Technologies released information about new twin stage turbo (twin turbo) version of this engine in summer 2007, engine is available with two power levels, first one is producing 180 PS (178 hp/132 kW) and second one 190 PS (187 hp/140 kW), both have a maximum torque output of 400 N·m (295 lb·ft) at 2000 rpm. 180 PS version production started summer 2007. The engine weighs approximately 185 kilograms (410 lb). This engine will be sold both to Fiat Group Automobiles and other brands, but the 190 PS (140 kW; 187 hp) version is reserved only to Fiat Group Automobiles.
Original story from GM shows the tuning potential though.
Last edited by GhostyDog; 07-07-09 at 08:23.
Reason: better title more clarification