(Newbie) Question about catalyc converter

Street Lau · Post by **Street Lau** » Mon Oct 03, 2005 2:03 pm

Im planning to change my exhaust on a Nexia 1.5 ohc 8v.. Will i run into any problems if i remove the catalyc converter (hope its the right expression in english) if yes.. what would it be?

MMamdouh · Post by **MMamdouh** » Mon Oct 03, 2005 2:28 pm

if your exhaust system got only one O2 sensor then their will be no problems whatsoever... if you have two then you have to fool the second one or else you will have a CEL.

MMamdouh

AcingTeam · Post by **AcingTeam** » Mon Oct 03, 2005 8:51 pm

mmamdouh wrote:if your exhaust system got only one O2 sensor then their will be no problems whatsoever... if you have two then you have to fool the second one or else you will have a CEL.

MMamdouh

If you have 2, you can only remove 1 cat converter (the 2nd one, not the one by the headers), then you will have no problems. 1st and 2nd o2 sensors only measure the difference between the 1st cat... so if you remove the first cat, there will be no difference and you will get a cel (check engine light). But if you remove the 2nd cat, then it has no effect on those 2 sensors.

MMamdouh · Post by **MMamdouh** » Mon Oct 03, 2005 8:58 pm

what if you removed both and fooled the second O2 sensor?? that is what every body is doing.

MMamdouh

AcingTeam · Post by **AcingTeam** » Tue Oct 04, 2005 12:06 am

mmamdouh wrote:what if you removed both and fooled the second O2 sensor?? that is what every body is doing.

MMamdouh

That's an option as well. I would think that one that actually does this would absolutely fail the emissions... I mean, 0 out of 2 cats... 1 out of 2 mufflers...

Audacity Racing · Post by **Audacity Racing** » Tue Oct 04, 2005 12:18 am

emmissions? what emmissions?

MMamdouh · Post by **MMamdouh** » Tue Oct 04, 2005 12:38 am

Audacityracing wrote:emmissions? what emmissions?

indeed... we have no immissions test here so CATs are just an extra baggage.

MMamdouh

Street Lau · Post by **Street Lau** » Wed Oct 05, 2005 6:36 am

Thanks!! This exhaust system only have one O2 censor at the exhaust manifold.... So to remove the catalyc con. will make no problems? (other than sound, maybe a hp or 2 and polute a bit more )

MMamdouh · Post by **MMamdouh** » Wed Oct 05, 2005 8:10 am

yes thats about it... if you got a CAT swap pipe of the same diameter of the exhaust pipes you have their will be no change in sound... HP will be noticed at high RPM, some 4500 and above.

MMamdouh

karim · Post by **karim** » Tue Oct 11, 2005 11:49 am

who said there is no immissions test in Egypt

mmamdouh wrote:
Audacityracing wrote:emmissions? what emmissions?
indeed... we have no immissions test here so CATs are just an extra baggage.

MMamdouh

karim · Post by **karim** » Tue Oct 11, 2005 11:51 am

My car cat has 2 O2 in it, what happenes if I just empty the cat and install it again with the O2.

MMamdouh · Post by **MMamdouh** » Tue Oct 11, 2005 12:24 pm

karim wrote:who said there is no immissions test in Egypt

mmamdouh wrote:
Audacityracing wrote:emmissions? what emmissions?
indeed... we have no immissions test here so CATs are just an extra baggage.

MMamdouh

i said so... if a carburated car with no CATs whatsoever can pass the emissions test we have then we have no tests... hell you can give the guy doind the test 10LE (1.75 USD) and he will give you a PASS for the test.

regardless of the rules... we have no real emission test.

MMamdouh

MMamdouh · Post by **MMamdouh** » Tue Oct 11, 2005 12:26 pm

karim wrote:My car cat has 2 O2 in it, what happenes if I just empty the cat and install it again with the O2.

what type of car is it? and where is the 2 sensors? i have a Lanos with a 1.5 SOHC and the only O2 sensor i got is in the exhause manifold.

i also got one CAT right before the mid exhaust box but i have replaced it with a straigt pipe... give us more feedback about your car please.

MMamdouh

MMamdouh · Post by **MMamdouh** » Tue Oct 11, 2005 1:29 pm

karim wrote:My car cat has 2 O2 in it, what happenes if I just empty the cat and install it again with the O2.

what car is it? on my lanos i have only one O2 sensor at the exhaust manifold and i did use an empty CAT... it felt additional power at high rev band but the sound was not good... almost like a metal fart can.

a better solution is to get yourself a CAT bypass pipe just like mine and you will get the HP gains without the crappy sound... here are some refrences with pics:

http://www.daewootech.com/forum/viewtopic.php?t=2793

http://www.daewootech.com/forum/viewtopic.php?t=3833.

MMamdouh

karim · Post by **karim** » Tue Oct 11, 2005 1:42 pm

No sir. Every car has to take the emmissions test, have took it before in 2 of my cars, and one failed the test real bad, because it had a broken piston ring, and even after I changed the engine it failed but the guy saw me upset, he let me pass, and the other car was my new Honda City he test it twice and hell it gave 0% although he rest the gadget twice, maybe something wrong with it.

mmamdouh wrote:
karim wrote:who said there is no immissions test in Egypt

mmamdouh wrote: indeed... we have no immissions test here so CATs are just an extra baggage.

MMamdouh
i said so... if a carburated car with no CATs whatsoever can pass the emissions test we have then we have no tests... hell you can give the guy doind the test 10LE (1.75 USD) and he will give you a PASS for the test.

regardless of the rules... we have no real emission test.

MMamdouh

The original daewootech forum

(Newbie) Question about catalyc converter

(Newbie) Question about catalyc converter

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