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Old 12-04-2007, 01:08 PM   #1 (permalink)
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Article: ecomodding a vanilla Renault production sedan... efficiency up 19%

Some very interesting details in this article in the list of peformed mods.

The net effect was reduced CO2 emissions from from 120g CO2/km to 97g / km - putting it in the same league as a Prius. (Though it should be noted: they are not exactly comparable vehicles.)

Renault Introduces Logan Renault Eco2 Concept at Challenge Bibendum; Taking a Production Car from 120g CO2/km to 97g

Powered by a 1.5 dCi (63kW/85hp) engine which runs on B30 biofue1, Logan Renault eco2 Concept incorporates a variety of technical enhancements and innovations, all of which are paths for future vehicle development at Renault.

The powertrain is based on the 1.5 dCi (85hp) engine launched at the end of 2007 and homologated at 120g CO2/km. The final drive ratio has been lengthened 8% to reduce fuel consumption while ensuring a level of mid-range acceleration that is suitable for ordinary use. This enhancement enabled a saving of 4g of CO2/km.

Renault also re-calibrated the injection system by introducing seven-hole nozzles (instead of five as is the case with production models) and widening the piston bowl for enhanced fuel spray and combustion. This modification produced a saving of 5g of CO2/km.

Finally, by optimizing the play between certain moving parts and using low-viscosity lubricants (5W20 plus additives instead of the standard 5W30), Renault reduced internal engine friction. The gear oil is also less viscous. This work helped cut CO2 emissions by a further 2g/km.
There's much mre, including the list of several aeromods, LRR tires selection, steering geometry setup & other drivetrain tweaks.

The sum of all the work that went into Logan Renault eco2 Concept achieved record low CO2 emissions of just 97g/km (NEDC combined cycle) equivalent to fuel consumption of 3.8 liters/100km (62 mpg US).

Furthermore, the extra-urban phase of the NEDC driving cycle returned UTAC homologated fuel consumption of just 3.4 liters/100km (69 mpg US), equivalent to CO2 emissions of 88g/km.
Definitely worth a read:
Green Car Congress: Renault Introduces Logan Renault Eco2 Concept at Challenge Bibendum; Taking a Production Car from 120g CO2/km to 97g

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Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget

Last edited by MetroMPG; 12-04-2007 at 01:14 PM..
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