A particulate filter and an eight-speed gearbox on the Peugeot 308 PureTech 130, a function that cuts the engine while driving on the Golf 1.5 TSI EVO 130 DSG: gasoline compact technology compete to meet future anti-pollution standards. But who has the best solution?
The NOx reduction systems cause the increase of particles emitted, and require the installation of a particulate filter on gasoline models (mandatory equipment since 2011 on diesel). At Peugeot as at Volkswagen, these developments come with a few months ahead … but take different solutions on the 308 and Golf here compared.
The 308 PureTech 130 EAT8 in details
Launched in spring 2014, the 1.2 PureTech 130 hp three-cylinder is still too recent to be scrapped: optimization of the turbo, reduction of internal friction and direct injection pressure pushed from 200 to 250 bar promise a consumption down 4 % compared to the previous version.
The EAT8, it even predicts a gain of 7% compared to the EAT6 (2 kg heavier), thanks to its new feature “freewheel” . Its goal ? Leave the car in neutral in the deceleration phases, to limit its slowing down and less stress the engine during the raises. A questionable device because while idling, the engine burns a little fuel … it would not consume at all during a conventional deceleration.
The Golf 1.5 TSI EVO 130 DSG7 in details
To circumvent this last reservation, Volkswagen inaugurates a new function: the free wheel, yes, but engine off! Up to 130 km / h, the Golf TSI 130 with DSG7 box stops its four cylinders during decelerations, and ensures the operation of on-board equipment via a lithium-ion auxiliary battery placed under the driver’s seat.
A device that adds to the deactivation of the cylinders , already known on the 1.5 TSI 150 and the former 1.4 TSI: at a steady speed, between 1400 and 3200 rpm, the engine cuts two of the four cylinders to lower its consumption. This augurs records for sobriety, also served by a new combustion system derived from the Miller cycle and a compression ratio announced “very high”. Verdict?