Emissions Help

[Sheriff Wan]

Hi Guys,

Looking for some help here.

I have recently installed an RB25DET (96 SII) motor into my R32.

It has a front pipe and a cat back exhaust (no dump) and an HKS 2530, the rest of the motor is standard i.e ECU, AFM etc

I went to the engineers to get a VASS certificate and part of that was the emissions test - just a basic one at idle.

The car failed by quite alot in the following categories:

- CO - was at about 4% to 5% | when it should have been <.45%

- HC - was at about 800 ppm | when it should have been <250ppm

The engineer seemed to think it has no cat! I know it has one as it was complied and registered with the cat thats in there, he also suggested the o2 sensor - which I have replaced.

The car was hot when the test was done - drove it to the engineer and basically did the test within 2 mins of arrival...

What im looking for is some assistance on passing - I am looking at purchasing a compliance cat and as I said I have replaced the o2 sensor already.

Any ideas other than that as to why it would have failed by so much being so close to standard? I wouldn't think a bung o2 sensor would throw emmisions out by that much?

Thanks and sorry for the long post...

[Adriano]

What plugs are you running, hotter plugs(heat range 5)will help

[R31Nismoid]

Also just because there is a "CAT" there, doesn't mean it's fully complete.

It could have easily collapsed or blown apart @ one or another points.

Which VASS did you go to?

[rob82]

Also just because there is a "CAT" there, doesn't mean it's fully complete.

It could have easily collapsed or blown apart @ one or another points.

Which VASS did you go to?

Catalytic converters are a part that wear's over time, they can still totally be intact and not offer any benefit in reducing emmissions CO and HC - I think the maximum life expectancy is around the 150000k mark. What you need to get is a Euro IV emmissions cat off like a BF XR6T. I would also try as has been suggested hotter plugs with a larger gap - at least 1.1mm and make sure the ignition timing is not overly advanced.

[Sheriff Wan]

Thanks for the replies guys - most helpful.

I'm getting compliance cat, which should do the trick.

Ash - I took it to Enklemen and associates, on your recommendation, they are a great bunch of guys!

Keep the suggestions coming, appreciate it.

[R31Nismoid]

I'd get a better cat, as stated by rob82 to be honest, i mean the XR6T does run two cat's if im not mistaken, so at least one will help you!

But yeah, open the plugs (i think mine were @ 1.2 when i did my test). Just good ole coppers.

Also make sure all the coil packs are firmly plugged in, connections are good etc (like no corrosion).

Enklemen are a good bunch of people, but they do shoot reasonably straight at the same time

[Sheriff Wan]

Yeah from what I have read an internally rooted cat will cause both CO and HC to go way out... Hence my result.

I have picked up and installed a compliance cat, so that should do the trick.

I'll regap the plugs to 1.1+ also - can't hurt.

Should be getting back to the engineers in the next week or two so i'll let you all know how I get on.

Thanks again guys

[frozenwaffles]

yeah keep us updated on thsi one bro...

what cat did you end up buying?

[Sheriff Wan]

I got a magna flow one - they use them for compliance so I figure they are tight.

Ash were you running heat range 5 or 6 plugs when you did yours?

[R31Nismoid]

I think they were 6's or 7s, wouldn't be 5's.

[STATUS]

If it still fails check that the start wire hasnt got constant 12v wired to it also (orang wire or orange with blue stripe). I had some issues with a similar conversion and i found the "start" signal wire at the ecu was wired to ign power not start power. This adds to the injection time = rich and epa fail.

I only mention it as its had a conversion.

[Sheriff Wan]

Well I passed with flying colours!!!

For the record, and reference I had:

magnaflow catalytic converter

bcpr7e - gapped at 0.8

new ntk o2 sensor

so friggen happy right now!

Fully legal r32 with rb25!!!