EcoModder Forum Converting Emissions test to C02 g/km?

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 12-17-2007, 05:08 AM #1 (permalink) Pokémoderator     Join Date: Dec 2007 Location: Southern California Posts: 5,864 1999 Saturn SW2 - '99 Saturn SW2 Wagon Team Saturn 90 day: 40.49 mpg (US) Thanks: 439 Thanked 529 Times in 356 Posts Converting Emissions test to C02 g/km? Hello - In Europe they have an emissions test where the cars CO2 output is rated in grams/kilometer. They are required to report this for all their new cars. I am interested in figuring out what my CO2 g/km, but all I have to work with is my USA emission's test : Obviously, this isn't the same kind of test, but it's all I have to work with. Does anyone know how to extrapolate the CO2 g/km from a California smog test? Thanks, CarloSW2 __________________ What's your EPA MPG? Go Here and find out! American Solar Energy Society
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Hi Me -

This doesn't answer my question, but at least I can do some "gleaning" and make approximate statements. I just noticed this :

Article: ecomodding a vanilla Renault production sedan... efficiency up 19%
Quote:
 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.
This implies the following ratios :

97/3.8 = 25.52
88/3.4 = 25.88

Pretty close! We'll take the average for a constant of 25.7.

Now, I know that my car is currently getting 41.35 MPG, or around 5.66 liters/100km. Plugging that in we get the following :

X(g/km) / 5.66 = 25.7 => X = 25.7*5.66 = 145.46 => CO2 emissions of 145 g/km

EDIT : This is not right. I am comparing the performance of a diesel to my gasoline engine. Gotta go do some more homework.

CarloSW2
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What's your EPA MPG? Go Here and find out!
American Solar Energy Society

Last edited by cfg83; 01-15-2008 at 02:08 PM..

 01-15-2008, 02:02 PM #3 (permalink) Dartmouth 2010     Join Date: Nov 2007 Location: Hanover, NH Posts: 6,447 Vegan Powa! - '91 Honda CRX DX Team Honda 90 day: 66.52 mpg (US) Thanks: 92 Thanked 122 Times in 90 Posts For some reason, I get them impression that in the euro tests FE and CO2 are roughly equivalent but not always completely, which does confused me a bit...:/ __________________ EcoModder's best: Donate to EM | Window clings | EM Shirts | Better Gas Mileage | MPG Tracking More fun sites: Green Home Improvement | crxMPG | Benjamin FT Jones | Vegan Recipes | Car-free Living
Pokémoderator

Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 529 Times in 356 Posts
SVOboy -

Quote:
 Originally Posted by SVOboy For some reason, I get them impression that in the euro tests FE and CO2 are roughly equivalent but not always completely, which does confused me a bit...:/
Me too. I have a German car magazine that publishes all the drivetrain options. It publishes liters / 100km and their C02 output, so I can do some more ratio testing. I am guessing that the constant would be different for diesels or cars that have unique emission control strategies (i.e. MBenz Bluetec urea solution for diesels).

Whooops! I did it again. I don't have a diesel. I better go find that German magazine and do some more ratios.

CarloSW2

__________________

What's your EPA MPG? Go Here and find out!
American Solar Energy Society