Cat What's The Point ?

[FPVF6355]

I had a tune about a year ago and had a 4" cat fitted same time. car ran great.

Over time ecconomy got worse, performance was dying, "system too rich" fault always showing on XCAL 3

Also started making a whistling sound at low boost.

Fuel ecconomy reached 17lt / 100K's

I suspected the cat was blocking up, so to be sure before spending money on a new cat and tune, I punched it.

Fuel ecconomy dropped to 12.5Lt / 100 K's

Power came back with a vengence.

Whistle noise went away.

So if I am burning 25% less fuel, therefore 25% less emissions, whats the point of a cat ?

A cat is suppose to convert gases into more enviromently friendly gases, but they don't convert until the cat is hot, and highest concentration of gases are made when cold on start up.

If a cat is fitted can I breath the exhaust fumes ? I think not.

[Panda Eyes]

takes the poisons out, avoids a 25k fine....

[JETURBO]

Punched FTW

[FPVF6355]

takes the poisons out, avoids a 25k fine....

I get the fine, but the poisons is reduced not removed you can't breath the sh#t. is it more than 25% less ??

I made a kit car in 2005 and used a lexus v8, without cat it passed current emmisions test with stock ecu settings, donor car had a cat fitted.

[Mr_4.0]

What a pointless bloody thread!!

[ratter]

Using less fuel does not equate to less emissions

[FPVF6355]

_{If a car is tuned for performance, and that effects the cat, what cat can be fitted that won't block up ?}

_{The point is, if the cat blocks up and uses 25% more fuel, and creates 25% more emmisions, a cat that doesn't work, does nothing, except please the epa, even though it wouldn't pass a new emmissions test.}

Edited 15/11/12 05:46 AM by RHR
can read it now

[Paulie2256]

not sure if srs or troll.

Cat is there to convert carbon monoxide to water and carbon dioxide. Carbon dioxide is the reason why exhaust gas is no good for people, however the trees love it and turn it back into oxygen. Trees can't do sh*t with carbon monoxide which is what is coming out of your exhaust with no cat. As stated 25% less fuel does not mean 25% less emissions.

stupid logic is stupid

[JETURBO]

I is stupid 25%

[GTEXXED]

we knew that...