The Corolla Verso will become the second Toyota car, after the Avensis, to receive the new 177-hp (130-kW) 2.2-liter D-4D Clean Power diesel engine.
That configuration will also be equipped with the Toyota D-CAT (Toyota Diesel Clean Advanced Technology—earlier post) emissions control system which simultaneously reduces both Nitrogen Oxide (NOx) and Particulate Matter (PM) emissions to better than Euro-4 standards.
Specific figures for the engine applied in the Corolla Verso aren’t out yet, but comparing the emissions performance of the two newest D-4D engines in the Avensis provides some insight.
The Avensis uses the 117-hp version with D-CAT that will also be in the Corolla Verso, as well as a 150-hp version of the 2.2-liter engine without D-CAT. As shown on the plot to the right (Click to enlarge), the less powerful 150-hp version has much higher levels of emissions (although still beating Euro 4 requirements) than the 177-hp version with D-CAT.
As an aside, when compared to the more stringent SULEV requirements, the D-CAT also beats that PM requirement, although it fails to meet the NOx level specified.
The 177-hp 2.2-liter D-4D engine develops 400 Nm of torque and features a range new diesel technologies such as a new generation common-rail system with piezoelectric injectors, 1,800 bar injection pressure, and the lowest compression ratio of the segment, 15.8:1, which contributes to improved fuel economy and a reduction in noise and vibration levels.
In the Avensis, the engine consumes 6.1 liters/100 km combined cycle (38.6 mpg US) and emits 161 g CO2/km.
A 136-hp (100-kW) variant of the same engine will also be available, although without D-CAT.
The 136-hp diesel replaces the current 116-hp 2.0-liter D-4D in the Verso lineup. The new engine also boasts an improved torque level of 310 Nm, compared to 280 Nm for the previous 2.0 D-4D unit.
The D-CAT emissions control technology ran into some stormy PR weather earlier this year when the German Automobile Manufacturers Association (VDA) disputed the claims of the system’ performance. VDA members stated that the D-Cat system begins to lose its effectiveness after 5,000-8,000 km and that NOx emissions rose then from 0.05 gram per kilometer to 0.2 gram per kilometer.
Toyota countered that the incidents were isolated and that the testing may have been flawed.