Catalytic convertor Euro specification

[WACR]

Does anyone know what Euro specification I need for current emissions testing? I am talking with Darren at Difillipo Exhausts and he is supplying me his cobra kit side pipes, he will supply cats inside sidepipes but wants to know the required specification.I have a Classic Revival kit car with the standard LS1 motor.

[sambo]

I think the LS1 was euro 3, certainly no later. That doesn't mean your car will pass a smog test though, too many other variables. I guess the chances of getting pinged for pollution are pretty low, so long as the Police/EPA can see the cats you'll be OK. Otherwise it's a big fine for not having them - as you probably know.

[WACR]

Thanks Sambo, someone also told me try E85 fuel for the test, that can really help.

[sambo]

A few more tips - mount the cats close to the engine, MAF in the correct position, and keep the engine as warm as possible prior to the test.

[kyleb]

WACR.
I don't believe you need a cat that suits a euro 3 configuration.
Just need a quality cat.
A quality cat is one with a high amount of the precious metals that do the 'magic'
to reduce emissions therefore they are more expensive.
I used one for a XF series falcon on my LS1 and got through first time.
Sambo is spot on. It's about proper placement of the cats and the airflow meter.
Also it comes down to who is doing the drivecycle test on the dyno.
If they short shift you get less emissions and vice versa.
Mine would come close to failing on the deceleration and we put that down to the Maf being too close to the throttle body.
This is all predicated on your tune being spot on and engine running right.
E.g No misfiring etc.
Cheers

[sevenohms]

Originally Posted by kyleb

WACR.
I don't believe you need a cat that suits a euro 3 configuration.
Just need a quality cat.
A quality cat is one with a high amount of the precious metals that do the 'magic'
to reduce emissions therefore they are more expensive.
I used one for a XF series falcon on my LS1 and got through first time.
Sambo is spot on. It's about proper placement of the cats and the airflow meter.
Also it comes down to who is doing the drivecycle test on the dyno.
If they short shift you get less emissions and vice versa.
Mine would come close to failing on the deceleration and we put that down to the Maf being too close to the throttle body.
This is all predicated on your tune being spot on and engine running right.
E.g No misfiring etc.
Cheers

Something for those to consider, and might explain some of those who struggle to pass with stock equipment:

The IM240 test is actually measured as weight (of gas) per kilometre. So if you have a stock car, and modify it with 4.11 gears, smaller wheels, anything that puts the revs up, then you make more weight of gas per kilometre (as there is more revs per kilometre), and therefore you might fail. As stated above, shift points also change the result. Conversely should also be true, more gears, lower final drive ratios, etc will also help.

Food for thought.

[Cobra_8]

I think noise will be the bigger concern than emissions for side pipes to be honest...

[WACR]

Thanks guys I shall certainly take the advice on board.