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Mazda3 emissions drop to 99g/km CO2

The Mazda3 is now available with a 1.5-litre diesel engine which results in the emissions dropping to 99g/km CO2, along with fuel economy improving to 74.3mpg, when matched to the six-speed SKYACTIV-MT manual transmission.

Available in hatchback and Fastback body styles, the new 1.5 SKYACTIV-D is offered across all trim levels with prices starting at just £18,895.

The hatchback version of the SKYACTIV-D 1.5 can be specified with a six-speed SKYACTIV-DRIVE automatic transmission.

How have Mazda3 emissions been improved?

Developed with same ‘Defy Convention’ approach as Mazda’s larger SKYACTIV-D 2.2, the smaller capacity diesel features an exceptionally low 14.8:1 compression ratio. When the compression ratio is lowered, compression temperature and pressure at top dead centre decrease; consequently, ignition takes longer even when fuel is injected near top dead centre, enabling better mixture of air and fuel.

The advanced engine features high-dispersion solenoid fuel injectors to suppress cooling losses and provide the optimum injection pattern for the given driving conditions. This improves both combustion efficiency and engine refinement levels. In addition, the combustion chamber features a unique ‘shouldered’ design to suppress flow around the lip of the chamber and prevent combustion gas cooling.

The engine comes as standard with Mazda’s i-stop idle-stop system, along with a single variable turbine geometry turbocharger that delivers boost from low engine speeds and uses a rotation speed sensor to maintain output through to higher revs.

With peak torque of 270Nm available between 1,600 and 2,500rpm, the high-pressure exhaust gas recirculation system is supplemented by a low-pressure exhaust gas recirculation system to further enhance engine response, while the water-cooled intercooler is integrated into the engine’s lightweight manifold.

All of these factors combine, ultimatley allowing for a lower impact in Mazda3 emissions.

In the UK, 42 per cent of C-segment diesel sales deliver sub-100g/km CO2 emissions.

The 105ps 1.5-litre SKYACTIV-D diesel engine already appears in the Mazda2 and Mazda CX-3.

Mazda3 emissions improved