HOW THE PETROL PARTICULATE FILTER WORKS
The new filter is tucked in behind the engine a few centimetres from the turbo, heats up very quickly and becomes effective seconds after starting from cold. At its core, exhaust is forced through the walls of channels blocked off at alternate ends. The trapped particulates are superheated, reduced to CO2 and, at the same time, the unwanted HC, NOX and CO are converted to small amounts of CO2, nitrogen and water.
After leaving the filter, exhaust gases pass through a second, conventional three-way catalytic converter mounted beneath the floor. This ensures the tailpipe exhaust complies with the latest level of EU6C emissions standards even when the engine is working flat out.
The Up GTI is subject to the new WLTP (World Harmonised Test Procedure) and RDE (Real Driving Emissions) testing standards. Like EU6C, WLTP applies to all new types of car introduced after September 2017. WLTP should ensure the quoted emissions are much closer to real world outputs.