New stop-start system to ensure 104g/km CO2 for 2.2-litre diesel Mazda 6
6 January 2012

The all-new Mazda 6 range, which goes on sale in the UK in January 2013, will feature an innovative power storage stop-start system. There will also be a new coupe variant, effectively replacing the MX-6 that ended production in 1997, alongside the saloon and estate.

The set-up will help ensure that the powerful, 2.2-litre, Mazda 6 SkyActiv diesel will have a Co2 rating of just 104g/km. The new Mazda 6 was previewed at the recent Tokyo motor show by the Takeri concept.

Read more about the Takeri concept

Know as i-ELOOP, the set-up is based around a series of capacitors, mounted behind the nearside headlamp, which can store electricity in the same way as a battery. The system also uses a variable charge (12v-25v) alternator and a DC/DC convertor.

When the driver of the 6 Sky Activ lifts off the accelerator, energy from the car’s momentum is turned into electricity by the alternator and stored by the capacitors. It is then run through the DC convertor and stored in the car’s battery. This ‘free’ energy can then the used to power the vehicle systems such as the headlamps and air-con when the car’s engine is in ‘stop’ mode.

The energy in the i-ELOOP’s capacitor pack is deployed for the periods when the driver is accelerating. The alternator is de-clutched, so the engine is not using energy to generate electricity. Instead, the power needed to drive the car’s systems is again taken from the capacitor pack.

Mazda engineering sources told Autocar that, further into the future, larger capacitor packs will be fitted to the company’s vehicle to ‘aid acceleration’. The i-ELOOP will be fitted as part of Mazda’s new SkyActiv technologies.

Our Verdict

Mazda 6

The Mazda 6 is a Ford Mondeo rival with rakish styling and lightweight, low-emissions tech

Join the debate


6 January 2012

What's the news on the petrol units? Are these also going to be fitted with the same system?

To me Mazda seem to have the most exciting plans of any manufacturer at the moment, mainly because they are working on real world solutions the the CO2 problem and not trying to ram EV's and the like down our throats.



It's all about the twisties........

6 January 2012

[quote Autocar]The set-up will help ensure that the powerful, 2.2-litre, Mazda 6 SkyActiv diesel will have a Co2 rating of just 104g/km.[/quote]

That's pretty good going! I imagine that figure would be coupled with a combined fuel consumption figure of around 70mpg. Not bad for a 2.2-litre family car!

6 January 2012

I have so much admiration for Mazda at the moment. Fantastic technology!

6 January 2012

In the Mazda3, I reckon this version of the diesel engine would limbo under the 100g/km barrier.

6 January 2012

Not just the technology that's impressive, but their ability to get it to market. It shows how well connected their engineering function is to all the other parts of their operation.

6 January 2012

If a 2.2 diesel can manage just 104g/km, how about a 2.0 diesel with 99g/km for the UK market?

Bring it on, Mazda...

6 January 2012

Its good to see Mazda.along with the rest of the Japanese car industry making a comeback.Im a little fed up with hearing about Audi,BMW et al every day.No offence meant :)

7 January 2012

I read somewhere that for a start-system to work effectively you need two batteries, one to power the starter, one to power everything else. This seems a very elegant alternative, and appears to be well worked out and shows that Mazda are one of the world's most innovative car companies. On the other hand, I wonder if it will make any difference in the real world rather than an artificial test in a laboratory. Either way we will be paying the price for it and Mazda enginers may well be missing the opportunity to make other advances of real practical value by being diverted along a probable blind alley.

Add your comment

Log in or register to post comments

Find an Autocar car review

Driven this week

  • BMW M5
    First Drive
    22 March 2018
    Super saloon deploys four-wheel drive to improve every facet of its driving experience. Faster and more capable than any, and more exciting than most, of its celebrated predecessors
  • Range Rover Sport SVR
    First Drive
    22 March 2018
    More power and an intoxicating soundtrack have breathed new life into our love affair with the biggest, baddest Range Rover Sport variant
  • First Drive
    21 March 2018
    The new Vantage has been developed as a Porsche 911 beater, and our first taste on UK roads suggests it can live up to that bold claim
  • Nissan Leaf Tekna
    The is the new Nissan Leaf
    First Drive
    21 March 2018
    The new version of the world's best-selling electric car gains a bigger battery and more power. How does it compare to rivals such as the Volkswagen e-Golf?
  • Range Rover p400e
    First Drive
    20 March 2018
    The original luxury SUV is now available as a plug-in hybrid, promising lower emissions and the capacity for silent electric motoring