Fiat Powertrain Technologies (FPT) has introduced a new member of its diesel engine family: a 1.9-liter JTD (uniJet Turbo Diesel) two-stage turbodiesel. Based on the current 1.9 JTD 16-valve engine, the new unit will be available in 180 hp (134 kW) and 190 hp (142 kW) versions. The current high-end 1.9 JTD engine with a variable geometry turbo offers 130 hp (97 kW).
The new engine improves low-end torque by 50%, with 300 Nm (221 lb-ft) available from 1,250 rpm. Maximum torque is 400 Nm (295 lb-ft) at 2,000 rpm. With the higher rating, the engine offers 100 hp/liter. The engine will be Euro-5 compliant.
FPT delivered the performance boost through the introduction of the two-stage turbocharger, combined with design changes to increase the thermostructural resistance of the cylinder to an increased peak cylinder pressure (up to 180 bar) and exhaust gas temperature (up to 800° C).
The two-stage turbo (TST) uses a small turbocharger operating at low rpm for optimal low-end torque and response from low vehicle speed. This small turbo is bypassed when the required power output increases and a second, larger turbocharger comes into operation.
The TST technology supports an increased exhaust gas recirculation (EGR) rate without penalties on fuel consumption, thereby contributing to reduced NOx emissions.
FPT also redesigned the inlet ducts, and reduced the compression ratio from 17.5 to 16.5.
Production of the 180 hp version is due to start in July; production of the 190 hp version is due to start in June 2008. Both versions will be produced at the FPT plant in Avellino, Italy. Fiat will sell the 180 hp version to other automakers in addition to using it within the Group, but is reserving the 190 hp version only for Fiat Group vehicles.
Fiat Powertrain was formed in March 2005 to handle all the powertrain activities for the other members of the Fiat group, including: Fiat Auto (Fiat Powertrain); Iveco (Iveco Motors); and Centro Ricerche Fiat and Elasis.