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Renault Enhances its New Diesel Line-Up

Regenerating filter for the 2.0 cDi

As it promised earlier this summer (earlier post), Renault is announcing a higher-powered version of its new 2.0 dCi diesel engine, coupled with a periodic regeneration particulate filter.

The company is also coupling its 130-hp (96-kW) version of the 1.9 dCi engine with a new automatic transmission.

Power and torque curves for the 175-hp 2.0 cDi

The new 175-hp (127-kW) version of the 2.0-liter engine uses the same engineering basics as its lower-powered cousin including:

  • Improved combustion chamber aerodynamics that produce a dual swirl effect for improved air-fuel mixing;

  • Bosch piezoelectric-controlled fuel injection with a five-squirt cycle;

  • EGR for NOx reduction.

Fuel consumption and CO2 emissions figures are not available yet.

The self-regenerating filter, which is already offered with the 1.9 cDi models, runs a regeneration cycle when the filter fills up by performing a second post-injection to deliberately overheat the exhaust gas. Above a certain temperature, the soot in the particulate filter oxidizes off, and the filter is regenerated—cleaned for further use.

Renault will first apply the new 2.0 cDi to the New Laguna, and will roll it out gradually to other Renaults.

The 130-hp (96-kW) version of the 1.9 cDi can now be used with the DP0 proactive automatic transmission with flickshaft control.

The 130-hp upgrade to the 1.9 cDi, announced in March 2005, uses increased turbocharge pressure from the variable-nozzle turbocharger of 2.5 bars, combined with injection pressure of 1,600 bars (up from 1,350) to contribute to an increase in power while offering fuel consumption of 5.9 liters per 100 km (40 mpg US) when used with the manual transmission.

The DP0 transmission, which is already available with several other Renault engines, uses a special controller than optimizes the dialogue between engine and gearbox. The controller implements seven gearshift patterns to allow for different driving styles, road profiles and vehicle weight.

Use of the automatic, however, comes at a cost. Compared to the 5.9 liters/100km delivered by the engine together with the manual transmission, the pairing with the DP0 bumps that up to 6.9 liters/100km (34 mpg US). Accordingly, while CO2 emissions with the manual transmission are 154 g/km, the automatic pushes that up to 183 g/km.

The entire line-up of new Renault diesels in Euro-4 compliant.


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