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DREMEN

By DREMEN,
in General Automotive Discussion

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Roy Grand Master

Roy

Posted
Posted

If they get you to do an emissions test its easy, otherwise on visual inspection i think its pretty hard.

But my thoughts are dont do it. A good 3" cat will flow well and is legal. Some things we cant avoid like running re-written ECUs and aftermarket ECUs.

Then there is the shady topic of legaility concerning BOVs/Filters/Intercooler etc etc, but one thing we can do is run cats on our road cars.

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Guest INASNT

Guest INASNT

Posted
Posted
Originally posted by akeenan

you can put a straight pipe where the cat is and the shell of the cat round the pipe and make it look authentic.

when u go for a epa test they stick a probe near the cat and can tell if its working properly.

But think about it would u rather have that extra 5kw or be able to breath clean air???

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Ronin 09 Grand Master

Ronin 09

Posted
Posted

i had a cat-out pipe for a while. It will spool the turbo faster, but doesn't really do much for emissions. You are likely to only gain about 2-5rwkW so bugger it. And a gutted cat will likely flow worse than a hi-flow and hence make less power; as has been said it slows the velocity of the exhaust and causes more turbulence around the empty cat.

Just get a highflow from BATMBL and be done with it - i have and am very happy with it.

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floody Experienced

floody

Posted
Posted

Dunno about the cops, but I reckon the RSPCA would be onto you.....

seriously though, Why do it? its cheaper than a high flow cat, granted, but I doubt there would even be a noticeable increase over a healthy cat convertor. A clogged one would be a restriction though, but a healthy, fresh one , in a decent size, would be a negligible benefit

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JimX Grand Master

JimX

Posted
Posted

My motorcycle didn't come with a cat, and it's not legally required to have one on there. I don't actually know why, because the bike requires premium (toxic) fuel as well, so in theory it should have come with a cat. Strange.

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JimX Grand Master

JimX

Posted
Posted

Cats do fit on bikes. The current model VFR800 has one for a couple of years now (since 2001 I think) and it fits well enough (just smaller than a car one). A few other models have them too, like the Gold Wing.

In California I think all new motorcycles are required to have them. A trend that will probably follow elsewhere.

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JimX Grand Master

JimX

Posted
Posted

I actually wonder what happened to the old rotten egg gas smell that unleaded cars used to get. It doesn't seem to happen anymore. They must have removed a lot of sulfur from fuels.

As for motorcycle cats, I think as long as the general population and the politicians remain ignorant as to just how polluting motorcycles are (especially 2 strokes) then we won't be forced to put them on just yet :P

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