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Old 12-17-2007, 05:08 AM   #1 (permalink)
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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 :

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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

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Old 01-15-2008, 02:00 PM   #2 (permalink)
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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%
http://ecomodder.com/forum/showthread.php?t=179
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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Old 01-15-2008, 02:02 PM   #3 (permalink)
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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...:/
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Old 01-15-2008, 02:07 PM   #4 (permalink)
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SVOboy -

Quote:
Originally Posted by SVOboy View Post
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

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