From £10,265
It won’t save the planet, but Peugeot/Citroen’s new diesel micro-hybrid system is still worth having

Our Verdict

Citroën C3
Citroën has plenty of takes on the small car theme, but the C3 is what you’d consider its regular supermini

The Citroën C3 is a competent and interesting supermini, but it doesn’t hit any high notes

  • First Drive

    Citroën C3 1.6 e-HDi

    It won’t save the planet, but Peugeot/Citroen’s new diesel micro-hybrid system is still worth having
  • First Drive

    Citroen C3 1.4 VTR+

    Majors on space, comfort and value - but not driving pleasure

What is it?

A Citroen C3 powered by Peugeot-Citroen’s EU emissions legislation trump card: a micro-hybrid diesel powertrain called e-HDi.

By 2012, PSA is aiming to sell a million cars in Europe every year that emit less than 120g/km of CO2, and most of them will be powered by this engine.

Diesel-sipping ‘stop-starts’ are much less common than petrols because, since diesel engines have higher compression ratios, heavier crankshafts, flywheels and balancer shafts and greater internal friction, they take more re-starting. Those diesel micro-hybrids that do exist use beefed-up starter motors and gearing systems that, claims PSA, are unsuited to fast, smooth hot starts.

So the French automaker has developed a stop-start system driven not by the car’s starter motor but off its alternator. Backed up by two ultracapacitors as well as a conventional battery, the alternator motor can supply 50 per cent more torque to the crankshaft than a conventional ‘ISG’.

That means its gearing can be higher and its engine restart performance faster. And because the stop-start system has a separate belt drive, it restarts the engine more quietly and smoothly than others too.

What’s it like?

The e-HDi system will appear on PSA diesels ranging from 1.4- up to 2.0-litres. In a 1.6-litre Citroen C3, it’s smoothness and speed of operation was very impressive indeed.

Here’s how it works. In a manual, the car must be in neutral and your foot off the clutch before the system will cut in. You don’t have to be stationary: below 13mph it’ll kill the engine if it thinks you don’t need it, but can restart it within 400 miliseconds.

Faster than you can dip the clutch and re-engage a gear, in other words.

Should I buy one?

Perhaps not if you’re looking to make an environmental statement. Despite its low rolling resistance tyres, taller gear ratios, low viscosity gearbox oils and intelligent ancilliaries, e-HDi is only worth five grams per kilometre on a car like the C3.

On a Citroen C5 or Peugeot 508, it’ll save more like 10g/km of CO2 – but that’s still not a great deal. It also encourages you to coast along out of gear in town, which we wouldn’t recommend as a driving technique.

As a cheap and unobtrusive way to make PSA cars a little more efficient, however, we approve of e-HDi. On a typical new Peugeot or Citroen, the system should cost you a few hundred pounds as of later this year, save you 15 per cent on urban fuel consumption, and deliver savings on VED road tax too.

If it proves reliable, it would be among the first options we’d choose.

Looking for a used Citroen C3 for sale? Visit PistonHeads Classifieds

Join the debate

Comments
5

9 June 2010

Now that diesel hybrids are making an appearance i could be interested,. just a shame its French, bargepole touch and wouldn't come to mind after my last experience of Citroen........ come on VAG and make an A2 successor with this tech!

10 June 2010

there are lots of cars with stops starts, but they are not classified as hybrids, why is this a hybrid? its not powered by a battery is it.

10 June 2010

[quote beachland2]

there are lots of cars with stops starts, but they are not classified as hybrids, why is this a hybrid? its not powered by a battery is it.

[/quote]

That must be why they call this a micro-hybrid rather than a hybrid.

Whatever next......

10 June 2010

It must be battery powered , or it wouldn't be a hybrid. BMW diesels have stop-start and "efficient dynamics" but they don't call them hybrids because they cannot be driven on battery power alone. Why are |Autocar not telling us how far this hybrid Citroen can be driven on battery power alone ? Pretty poor article.

10 June 2010

[quote Uncle Mellow]BMW diesels have stop-start and "efficient dynamics" but they don't call them hybrids because they cannot be driven on battery power alone. Why are |Autocar not telling us how far this hybrid Citroen can be driven on battery power alone ? Pretty poor article.
[/quote]

The point of destinction is the combined starter/alternator which these have and BMW dont (as far as i am aware). But i agree to me and everyone else that doesnt make it a Hybrid, even of the Micro type.

Of course it cant be driven anywhere on battery power only, but then neither can the Honda Hybrids, which are proper hybrids

Add your comment

Log in or register to post comments

Find an Autocar car review

Driven this week

  • 2016 Audi A3 Sportback e-tron UK review
    First Drive
    29 September 2016
    First UK drive finds the facelifted A3 Sportback e-tron remains a first-rate plug-in hybrid that is packed with tech if a little short on driver appeal
  • Citroen C11.2 Puretech 82 Furio
    First Drive
    29 September 2016
    Citroën's city car gets a new sporty-looking trim level, adding visual adornments, but no premium for the 1.2-litre Puretech triple we're driving
  • Mercedes C350e Sport
    First Drive
    28 September 2016
    Petrol-electric C-Class is a surprisingly well-priced alternative to a diesel but not the greatest example of the new ‘PHEV’ breed
  • Car review
    23 September 2016
    Aston kicks off its ‘second century plan’ with an all-new turbo V12 grand tourer
  • Ford Ka+ 1.2 Ti-VCT 85
    First Drive
    22 September 2016
    A rounded, refined and well-sorted bargain supermini – once you’re used to the confusing role redefinition imposed on the once-cheeky Ka