Just passed the NCT

alastair

Grand you might say, but I'd fully expected it to fail.

The car's exhaust is blowing (audibly), and it's been de-catted a year back*. I just figured I'd see what problems popped up other than the exhaust issue before getting it sorted in the garage. Not sure now if the blowing exhaust actually helped my emissions measurements?


*In order to ensure some degree of performance - it's a twenty year 1 lt that struggled to get up hills with the original cat in. Wasn't sure if the cat was doing anything worthwhile emissions-wise any more, so decided to just pull it and see what happened when the NCT came up.

unkel

Most cars that age didn't have a cat, so the tolerated levels of emissions are very high. Out of interest, what were the emissions and what car is it?

Armadillo

Have a look at this link:

http://www.mcnamaras.ie/main/NCT.php3

unkel

Armadillo wrote: »

Have a look at this link:

http://www.mcnamaras.ie/main/NCT.php3

Thanks, Armadillo, that's exactly the feedback we needed on this thread. My 928 passed on both CO idling (0.18 - fail would have to be > 4.5) and HC (177 - fail would have to be >1000)

On further thought, this is a bit worrying. My old car that doesn't even have a cat just passed the NCT emissions test even on the criteria for brand new cars. Did I miss something here?

zilog_jones

unkel wrote: »

On further thought, this is a bit worrying. My old car that doesn't even have a cat just passed the NCT emissions test even on the criteria for brand new cars. Did I miss something here?

The test is simpler and slightly different for pre-1994 cars (e.g. no lambda test) - the NCT manual is here: http://www.ncts.ie/nctmanual.pdf
I don't know the differences are significant enough to mean your car would fail the test for newer cars though.

That other website is also out of date - cars registered from July 2002 onwards need <0.3% CO at idle and <0.2% at 2500 RPM.

I don't think VTEC is really all that great for normal driving - haven't driven one myself but I've heard many people say they're gutless unless you're revving the shít out them. I believe i-VTEC and the other newer stuff addresses this problem though.

alastair

unkel wrote: »

Most cars that age didn't have a cat, so the tolerated levels of emissions are very high. Out of interest, what were the emissions and what car is it?

It's a Nissan K10 engine, and low idle figure is 2.35% CO, 276 ppm CH.