What Catalytic Converter To Get?

[sexual harrassment panda]

ballistic cat

[fastfwd]

This is the cat I got: http://www.ebay.com.au/itm/230650212802?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

The cat gives a euro 3 emissions standard which is what the stock cat is so it shouldn't pose a problem.

2ndly I haven't heard of any car that can confused the ECU with the amount of boost once the car has already combusted. Unless there was a sensor in the exhaust that regulates exhaust pressure and flow of some sort. Kinda doesn't make sense.

Could you please elaborate a bit more.

[cobramad]

The first O2 sensor looks at the exhaust gases and measures richness or lean-ness (Lambda) so cycles between 0v and 1v, about once per second. the post-catalyst 02 sensor also measures Lambda and its output is relatively steady in comparison to the first sensor ( .8 to.9v) If the reading from the second sensor fluctuates the PCM then thinks that the catalyst is not functioning correctly and flags a fault condition. I have seen rear sensors that cycle incorrectly and still flag a catalyst fault when there wasnt one. O2 sensors have to function in a harsh enviromnent and dont last forever. As the voltage they deliver is relatively small (less than 1v) its easy to see how one can cause incorrect codes to flag. There are much more clever forum members whose explanations may be clearer to understand so hopefully they can help you out.

[Dillz]

  On 14/12/2011 at 7:22 AM, fastfwd said:

This is the cat I got: http://www.ebay.com....984.m1497.l2649

The cat gives a euro 3 emissions standard which is what the stock cat is so it shouldn't pose a problem.

2ndly I haven't heard of any car that can confused the ECU with the amount of boost once the car has already combusted. Unless there was a sensor in the exhaust that regulates exhaust pressure and flow of some sort. Kinda doesn't make sense.

Could you please elaborate a bit more.

Do you mind throwing up some pics and give a bit of a review of that cat when you get it? They have been around for a while but there's not much info floating around on them.

Oh and how does a cat that flows 4 times better then the stock one produce the same emissions?

[ratter]

Very good answer.

Just because a cat is euro 3 does not mean it will not trigger your engine light, because it has lower cpi count it will be treating less exhaust gas so there is a strong chance it will still trigger the engine light.

Because the exhaust system will have less back pressure, the turbo will spool up easier which can lead to an overboost situation unless it is tuned for it.

[fastfwd]

  On 14/12/2011 at 8:23 AM, Dillz said:

Do you mind throwing up some pics and give a bit of a review of that cat when you get it? They have been around for a while but there's not much info floating around on them.

Oh and how does a cat that flows 4 times better then the stock one produce the same emissions?

Sure can...

Isn't that what a high flow cat is made for? high flow and same emissions?

  On 14/12/2011 at 8:25 AM, ratter said:

Very good answer.

Just because a cat is euro 3 does not mean it will not trigger your engine light, because it has lower cpi count it will be treating less exhaust gas so there is a strong chance it will still trigger the engine light.

Because the exhaust system will have less back pressure, the turbo will spool up easier which can lead to an overboost situation unless it is tuned for it.

Ahh yes overboost situation I can understand that but the way "cobramad" was putting it as if the car didnt know what boost to give low or high. Overboost is completely understandable. The lower back pressure meaning higher flow which the turbo overcompensates for and might over boost 1-2 psi which is fine for the daily drive for a month or two until I get it tuned properly.

Edited 14/12/11 08:58 AM by fastfwd

[ratter]

the overboost may trigger the ecu to go into limp mode

[fastfwd]

  On 14/12/2011 at 9:01 AM, ratter said:

the overboost may trigger the ecu to go into limp mode

Are you serious....what doesnt trigger the ECU to go into limp mode?

[Dillz]

  On 14/12/2011 at 8:57 AM, fastfwd said:

Sure can...

Isn't that what a high flow cat is made for? high flow and same emissions?

Not same emissions, they probably couldn't care less and just say that to help sell their product.

[Vevapower]

if you run E85 then these one's I've found work the best:-