Article: ecomodding a vanilla Renault production sedan... efficiency up 19%

[Piwoslaw]

Thanks for the pics, Ironick

[IRONICK]

The dashboard on the Logan eco2 concept has a gear-shift indicator to help the driver to optimise fuel consumption.

[Angmaar]

They should have added a belly pan to improve aerodynamics.

[cfg83]

IRONICK -

Thank you! I really appreciate your effort in taking all of these pictures. What's interesting is that because it's a concept, I can see some "execution details" that we could make use of.

CarloSW2

[IRONICK]

other pictures

[renault_megane_dci]

Note that no speed tape has been used and that the car is not "tuned to death".

It looks much more like a quick mock up rather than hair splitting.
Appart from the new pistons and electronic tuning, it is all achievable at home ...

I mean, they could have put narrower tires, lightened body parts or stuff like that but they didn't so that is very representative what can be done to production car

[IRONICK]

Originally Posted by renault_megane_dci

Note that no speed tape has been used and that the car is not "tuned to death"

more

[IRONICK]

I will do some changes on my car. (Dacia Logan, 1400cm³, gasoline)

[renault_megane_dci]

Gasoline is never gonna see any consumption that low but all the aerodynamics are on the card.

[IRONICK]

Clio dCi 85 Renault eco2: 98g/km CO2

This new version of Clio dCi 85 Renault eco² produces just 98 grams of CO2 per kilometre, corresponding to combined cycle fuel consumption of just 3.7 litres/100km and a theoretical range of 1,486km.

INCORPORATION OF THE LATEST ENGINE DEVELOPMENTS
· Longer gearing across all the transmission ratios: the torque and the flexibility of the dCi 85 allow this to be achieved without any significant impact on performance.
· Reduction of frictional losses in the engine and gearbox with the introduction of lowviscosity lubricants.
· Dedicated engine mapping focused on reducing fuel consumption and CO2 emissions.
REDUCTION OF ROLLING RESISTANCE AND DRAG
Improvements to aerodynamics:
· Flexible lip under front bumper extended by 15mm;
· Front wheel arch liner extension flaps;
· Specific underbody enclosure for rear axle.
These aerodynamics-related improvements have had no adverse effect on Clio's looks, and have notably been achieved without calling on such intrusive solutions as a rear lip spoiler or full disc wheel trims.
Reduced rolling resistance:
· Michelin 185x60 R15 low energy consumption tyres.

Taken together, these changes bring about a 5 per cent improvement in CdA, taking it from 0.725 to 0.690 and directly benefiting the vehicle’s CO2 emissions. The reduction of 17g/km has been achieved without any impact on driving pleasure, comfort or noise levels.

Top speed (km/h) 174

Cycle urban (l/100 km) 5,2
Cycle extra urban (l/100 km) 3,9
Cycle complet (l/100 km) 4,3

Speed at 1,000rpm:
in 1st gear 8.56kph
in 2nd gear 15.58km/h
in 3rd gear 24.15km/h
in 4th gear 32.85km/h
in 5th gear 42.20km/h

eco2 version

Top speed (km/h) 176

Cycle urban (l/100 km) 4.5
Cycle extra urban (l/100 km) 3.4
Cycle complet (l/100 km) 3.7

Speed at 1,000rpm:]in 1st gear 8.93km/h
in 2nd gear 16.26km/h
in 3rd gear 25.20km/h
in 4th gear 34.28km/h
in 5th gear 44.04km/h