R32 Emissions Woes

[dark.sky]

Wasn't sure what section this belongs in, but here goes.

Hey guys, I recently put a S1 R33 RB25DET engine and gearbox into my R32, and it is performing well, I am currently going through the process of having this conversion registered with Transport SA. As part of the inspection process, it needs to have an emissions test. My car failed this (specifically the carbon monoxide output), by quite a large margin, and Im just trying to figure out why, so I can get it fixed up ASAP. It now has a brand new oxygen sensor, as the old one was permanently reading rich, but this did not fix the problem. The other reading they do in the test was okay (hydrocarbons I think) so that sort of indicates the cat is functioning okay.... I think. The car has been hooked up via CONSULT and isnt returning any faults.

S1 R33 RB25 Engine, loom and ECU.

R32 stock exhaust and cat.

stock airbox, etc etc.

Any help would be greatly appreciated.

[TiTAN]

is it the cat that came with it? replace it with an XR6 turbo cat if you can get one otherwise i passed on a euro 3/4 generic 2.5" cat.

[dark.sky]

is it the cat that came with it? replace it with an XR6 turbo cat if you can get one otherwise i passed on a euro 3/4 generic 2.5" cat.

The exhaust and cat came off of another R32, so I dont milage on it or anything. Would you be thinking its the cat doing it? The exhaust that came with the car is in the shed, but its way too loud - 3" turbo back with high flow cat and straight through cannon.

Does the XR6 turbo cat bolt up to the stock exhaust, or would I need an exhaust shop to do it?

Edit: Just found this: http://cgi.ebay.com.au/XFORCE-3-BOLTON-HIGH-FLOW-CAT-S13-180SX-R32-R33-SKYLINE-/300500906493?pt=AU_Car_Parts_Accessories&hash=item45f73ff1fd

Reckons it bolts up to the stock system.

[Moodles2]

Don't get a X-Force cat, they don't actually pass EPA emissions. Need a Catco cat or some other compliance cat.

[TiTAN]

The exhaust and cat came off of another R32, so I dont milage on it or anything. Would you be thinking its the cat doing it? The exhaust that came with the car is in the shed, but its way too loud - 3" turbo back with high flow cat and straight through cannon.

Does the XR6 turbo cat bolt up to the stock exhaust, or would I need an exhaust shop to do it?

Edit: Just found this: http://cgi.ebay.com....=item45f73ff1fd

Reckons it bolts up to the stock system.

for the purposes of an emissions test you want a fairly new cat (one thats designed to meet euro 3 or 4 requirements) thats going to be as clean as possible, a 20 year old stock cat is not going to cut it.

if you cant weld an exhaust shop will need to do the work for you.

[mr_scary]

A cat converters job is to get rid of hydrocarbons AND carbon monoxide (+ nitrogen oxides), so yeah sounds like your current cat isn't operating at 100%.

Like others have said, try and get a new OEM or compliance style cat. Are there any knowledgable exhaust shops near you that you could have a chat to?

[XKLABA]

and if one won't do it get two,one of my mates had to do that to pass his turbo ae82 corrolla

[dark.sky]

Don't get a X-Force cat, they don't actually pass EPA emissions. Need a Catco cat or some other compliance cat.

http://www.justjap.com/store/product.php?productid=18066&cat=252&page=1

Would this cut it? Or do I need one which specifically says EURO 3/4?

Thanks so much for your help guys.

There are exhaust shops around, I'm just trying to minimise labour costs (if possible of course) as changing things like cats can be done in my driveway.

[TiTAN]

that cat may do the job or it may not, when it comes to emissions do it once and put the highest rated emissions cat in there that you can to give yourself the best chance of passing. Talk to your exhaust shop, they will be able to source/supply a cat to suit It MUST state that it is euro 3 or euro 4 emissions compliant these cats are NOT going to be designed for performance they are designed to clean up emissions.

[dark.sky]

that cat may do the job or it may not, when it comes to emissions do it once and put the highest rated emissions cat in there that you can to give yourself the best chance of passing. Talk to your exhaust shop, they will be able to source/supply a cat to suit It MUST state that it is euro 3 or euro 4 emissions compliant these cats are NOT going to be designed for performance they are designed to clean up emissions.

No worries, I'll get in touch with an exhaust shop tomorrow.

Thanks heaps mate.

[dark.sky]

Just thought I would let you know how this panned out, looks like my AFM was stuffed, and causing it to do silly things. It has now passed emissions, using the original cat convertor.