Has NCT Emissions test any relation to new CO2 road tax rates?

Prosta

Was wondering if the NCT emmisions Lambda value has any correlation to the CO2 g/km emmissions the new Road Tax rates are based on?

Did the NCT 2 weeks ago and the result was 109 but 109 what?
Does it match the A band on the new rates.
If so its a bit of a bitch I have to pay €320 for my '00 1.4cc car

Prosta

Seth Brundle

CO2 or CO?
IIRC CO2 isn't part of the test!

JHMEG

No.

alias no.9

NCT checks Carbon Monoxide and Unburned Hydrocarbons (fuel), both checked at idle and fast idle. Neither one correlates with CO2, despite what the likes of Mary White of the Green Party would have you believe when she spouted on about how green her car was, quoting her NCT emissions results as evidence, when talking with Matt Cooper a while back.

Sponge Bob

Not yet , penalty 'Green' VRT rates for 1% excess over nominal lambda are possibly planned for 2009 or even sooner but not yet announced .

I think its a 20% loading that is proposed. Just wait for the budget in september

3% over lanbda is a fail IIRC .

colm_mcm

the CO2 figures that VRT are based on take things like aerodynamics and vehicle weight into account.

For example, take a VW Polo, and an Audi A4, and presume that both have the same 1.9 TDI engine, NCT emissions may be the same, but on a test route to calculate CO2, the extra weight of the A4 over the Polo would increase emissions.

CO2 emissions are directly coupled to fuel consumption and the fuel type (unit of diesel fuel burned results more CO2 than petrol for example). The NCT would need to run a EU economy cycle with your car if they wanted to the CO2 emissions.

To really archive CO2 emission of 109 g/km your car needs to do over 60 MPG on average if it's petrol. I reckon Prosta's 00 1.4 does not average 600 miles on a 40 liter fill.

JHMEG

Thanks to deltona for posting this on octane.ie.

What happens if I want to import a second-hand car manufactured before 1997 and the documentation does not have details of the level of CO2 emissions?
In such instances, if the details of the fuel consumption of the vehicle are available, [the combined figures – derived from an average of the urban and extra-urban figures] the level of CO2 for the vehicle may be calculated using the formulae below.

Metric Calculations:

where the fuel consumption is shown as litres per 100km:
CO2 = fuel consumption x 23.20
e.g. If the fuel is shown as 5.81/100km then
5.8 x 23.20 = CO2 emissions of 134.56 or 135
where the fuel consumption is shown as litres per km:
CO2 emissions = fuel consumption/km then
If the fuel consumption is 0.058 x 2320
= CO2 emissions of 134.56 or 135
where the fuel consumption is shown as km per litre:
CO2 emissions = 2320/fuel consumption
If the fuel consumption is shown as 17.2 per litre then 2320/17.2
= CO2 emissions of 134.88 or 135


Imperial Calculations:

where the fuel consumption is shown as miles per gallon the figures must be converted to kms per litre as follows:
mpg/2.82485 = km per litre.
CO2 emissions are then calculated using the formula in c above.
e.g. If the fuel consumption is shown as 48.7 mpg then
5.8 48.7/2.82485 = 17.2 km per gallon and
2320/17.2 CO2 emissions of 134.88 or 135


Note: For diesel engines the multiplier changes from 2320 (or 23.20) to 2630 or (26.30) whichever is appropriate.

Captain Slow IRL

JHMEG wrote: »

Thanks to deltona for posting this on octane.ie.

What happens if I want to import a second-hand car manufactured before 1997 and the documentation does not have details of the level of CO2 emissions?
In such instances, if the details of the fuel consumption of the vehicle are available, [the combined figures – derived from an average of the urban and extra-urban figures] the level of CO2 for the vehicle may be calculated using the formulae below.

Metric Calculations:

where the fuel consumption is shown as litres per 100km:
CO2 = fuel consumption x 23.20
e.g. If the fuel is shown as 5.81/100km then
5.8 x 23.20 = CO2 emissions of 134.56 or 135
where the fuel consumption is shown as litres per km:
CO2 emissions = fuel consumption/km then
If the fuel consumption is 0.058 x 2320
= CO2 emissions of 134.56 or 135
where the fuel consumption is shown as km per litre:
CO2 emissions = 2320/fuel consumption
If the fuel consumption is shown as 17.2 per litre then 2320/17.2
= CO2 emissions of 134.88 or 135


Imperial Calculations:

where the fuel consumption is shown as miles per gallon the figures must be converted to kms per litre as follows:
mpg/2.82485 = km per litre.
CO2 emissions are then calculated using the formula in c above.
e.g. If the fuel consumption is shown as 48.7 mpg then
5.8 48.7/2.82485 = 17.2 km per gallon and
2320/17.2 CO2 emissions of 134.88 or 135


Note: For diesel engines the multiplier changes from 2320 (or 23.20) to 2630 or (26.30) whichever is appropriate.

Cheers, tried googling it but could not find anything!

Bartronilic

I failed my NCT 3 times in a row in car that would have had the lowest road tax possible all because a mechanic screwed up the catalytic converter while it was being serviced for WINDOW WIPER repair. True story.

Esel

The calculations above are from http://www.revenue.ie/leaflets/vrt-new-tax-regime.htm

crosstownk

Given the OP mentions NCT infers that the car is 4 years old.

So the answer to his/her question (stated previously by JHMEG) in NO.