|Fiat 500L running in the Bosch Diesel Challenge. Click to enlarge.|
A small fleet of Fiat 500L Living models, equipped with the 1.6 MultiJet II 105 HP diesel with Start&Stop, covered the 800-kilometer (497-mile) route from Turin to Paris on an average of 27 liters (7.1 gallons US) of fuel, corresponding to approximately 30 km/l (70.6 mpgUS, 3.33 l/100km). The drive was part of a Bosch Diesel Challenge; the 500L features a Bosch common rail system.
Similar average results were registered by the teams who travelled back from Paris to Turin, again without stopping for fuel. A professional driver drove the same distance on only 20.9 liters (5.5 gallons US) of fuel, equal to more than 38 kilometers per liter (89 mpgUS, 2.6 l/100km).
Fitted with a small fixed-geometry turbocharger, a variable-displacement oil pump and smart charge alternator, the 105 HP 1.6 MultiJet on Fiat 500L Living is a second-generation MultiJet engine. Maximum output is 105 hp (77 kW) at 3700 rpm; max torque is 320 N·m (236 lb-ft) at 1750 rpm. The engine is fitted to a six-speed gearbox.
A new fuel supply system with faster injectors is capable of multiple injections in rapid succession. Specifically, the MultiJet II system’s servo valve technology with balanced shutter is capable of managing up to eight injections per cycle, offering greater speed, flexibility and precision in the various phases of operation.
The injector is also simpler and more reliable because its construction is less complex and it has 40% fewer components. This new type of injector paves the way for new strategies focused on optimizing the increasingly advanced combustion, such as Injection Rate Shaping, which involves two consecutive injections so close together in time as to generate a continuous and modulated profile of the fuel supply into the cylinders.
With this method, the combustion process is improved, with advantages in terms of quieter operation and particulate and NOx emissions. Today, MultiJet II engines fully comply with the Euro 5 standard and use low viscosity lubricant oil to minimize friction.
The exhaust gas treatment system implements close-coupled DPF technology which integrates the oxidizing catalytic converter and the particulate trap (CCDPF). The component is compact to reduce exhaust counter-pressure—with beneficial effects in terms of fuel reduction and CO2 emissions. The particulate trap is arranged close to the turbocharger outlet to provide averagely hotter gas temperatures near the particulate filter. This reduces the amount of diesel fuel needed for regeneration.
The integration of the two components also reduces the weight of the exhaust system and improves global efficiency. The CCDPF is combined with an evolved gas recirculation system (EGR), in which all sub-components are grouped in a single very small sized part (EGR module).
At the Frankfurt Motor Show in September, Fiat announced a higher power rating version of the 1.6 MultiJet II—the 1.6 MultiJet II 120 HP (89 kW) turbodiesel—as well as a 120 hp 1.4 T-Jet gasoline engine. Both engine versions will be on sale by the end of the year.
Bosch noted that the results achieved in the first edition of its Diesel Challenge emphasizes the cost benefits of diesel-powered cars for long-distance trips—even more so if the vehicle can accommodate many occupants. The Fiat 500L Living allows the addition of a third row of seats, becoming the most compact ‘5+2 seater’ MPV in its category. In only 4.35 meters (14.3 ft), the car has room for either seven people or five people and 638 liters (22.5 ft3) of load, the largest in its market sector.
The Fiat 500L Living fleet that took part in the Diesel Challenge was equipped with Vodafone Mobile Wi-Fi 4G Internet connection, a Wi-Fi hotspot for connecting up to 10 devices and surfing the web at 4G speed up to 70 Mbps at the same time.
By using the Uconnect integrated devices fitted in their cars, the competing teams benefited from the eco:Drive Live, the application developed by Fiat to help drivers cut fuel consumption and CO2 emissions by monitoring driving style in real time and providing tips for even more eco-friendly motoring.
The Fiat 500L Living cars for the Bosch event were also equipped with Goodyear EfficientGrip tires for reduced rolling resistance, responsible for fuel consumption and CO2 emissions as a consequence.