Anyone Passed MOT Emissions Without Centre Cat?
11 August 2002, 04:27 PM
#1
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dodge,
I would have done this, except I have
6) Take MOT Cert to Post Office and get Tax Disk ASAP
If it failed without the cat, I would not have time to get it re-catted (?), and re-tested the same day AND get the tax on my car. Safer for me just to get the cat put back first.
Also, I didn't pay for the swap
and it only took 15 mins 
[Edited by Nimbus - 11/8/2002 4:28:40 PM]
I would have done this, except I have
6) Take MOT Cert to Post Office and get Tax Disk ASAP
If it failed without the cat, I would not have time to get it re-catted (?), and re-tested the same day AND get the tax on my car. Safer for me just to get the cat put back first.
Also, I didn't pay for the swap
and it only took 15 mins [Edited by Nimbus - 11/8/2002 4:28:40 PM]
08 November 2002, 03:29 PM
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Got the MOT tomorrow, so just had the centre Cat re-fitted. I was half wondering if it was worth replacing it. Has anyones car passed the emissions with the cat removed? I would have tried without, but I needed it to pass
It's on a UK MY95 BTW,
It's on a UK MY95 BTW,
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08 November 2002, 03:59 PM
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Do you mean i didnt have to have the FULL standard system fitted for the MOT?
Cost me a damn fortune in labour to have them remove the full decat system, fit the standard one, then put the decat back on [img]images/smilies/mad.gif[/img]
08 November 2002, 04:07 PM
#12
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The downpipe cat is the important one. If it's in good working order, the car will fly through the emmissions test.
My car passed with ease with only the centre cat in.
Stefan
My car passed with ease with only the centre cat in.
Stefan
08 November 2002, 04:16 PM
#13
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MOTs.
Surely if you fail them due to a decat, you have to get the thing 'fixed' - i.e the cat put back.
Rather than
1) get the decat removed,
2) have the MOT,
3) pass it,
4) replace the decat,
5) go for an 'enthusiastic drive'
Why don't people do the following:
1) have the MOT, with the decat,
2) If you pass, go to (5)
3) If you fail, add the cat back and pass the test
4) take the cat out again
5) go for an 'enthusiastic drive'
If you passed the test with the decat, you save yourself the price and time of 2 unnecessary cat changes!
Surely if you fail them due to a decat, you have to get the thing 'fixed' - i.e the cat put back.
Rather than
1) get the decat removed,
2) have the MOT,
3) pass it,
4) replace the decat,
5) go for an 'enthusiastic drive'
Why don't people do the following:
1) have the MOT, with the decat,
2) If you pass, go to (5)
3) If you fail, add the cat back and pass the test
4) take the cat out again
5) go for an 'enthusiastic drive'
If you passed the test with the decat, you save yourself the price and time of 2 unnecessary cat changes!
08 November 2002, 05:27 PM
#14
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Ah, well, fair enough!
I'd always assumed that a decat would fail drastically, until some of the recent postings - but in the light of these postings, (without your particular time constraints), "swap, test, swap" seems unnecessary. Or am I talking out of my decatted ****? I've no idea...
I'd always assumed that a decat would fail drastically, until some of the recent postings - but in the light of these postings, (without your particular time constraints), "swap, test, swap" seems unnecessary. Or am I talking out of my decatted ****? I've no idea...
08 November 2002, 06:00 PM
#15
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i passed last year and the year b4 without the Centre cat!
BUT today i've failed with a Full De Cat Zorst!!
as if i thought it would pass with NON on!!!
Getting it sorted next week now!
BUT today i've failed with a Full De Cat Zorst!!
as if i thought it would pass with NON on!!!Getting it sorted next week now!
08 November 2002, 06:02 PM
#16
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i passed last year and the year b4 without the Centre cat!
BUT today i've failed with a Full De Cat Zorst!! as if i thought it would pass with NON on!!!
Getting it sorted next week now!
BUT today i've failed with a Full De Cat Zorst!!
as if i thought it would pass with NON on!!!Getting it sorted next week now!
08 November 2002, 06:54 PM
#18
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So will it pass OK with just the centre cat? That should be pretty easy to refit but I don't fancy having to swap the downpipe twice every MOT time!
BTW Mines a MY96.
BTW Mines a MY96.
08 November 2002, 11:28 PM
#22
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All,
Centre CAT is pretty inefficient (remember P1s are Centre Catless as standard).
A Scooby with non-nackered Downpipe CAT & decat centre will easily pass an MOT.
A Scooby with non-nackered Centre CAT & Decat Downpipe sould pass an MOT after a spirited run (20 mins) to ensure the centre cat is up to full operating temperature.
I have heard of Fully decatted Scoobs - after a good run - passing an MOT if run High Octane (ie Optimax + RON Booster + Fuel Catalyst etc) - but this *IS* rare.
Chris.
PS - If you want performance & guaranteed MOT Pass look for High Flow CATs - Performance of a full Decat but with a single CAT capable of passing an MOT - expensive to buy - but in the long term probably cheaper than swapping pipes in and out for MOTs.
Centre CAT is pretty inefficient (remember P1s are Centre Catless as standard).
A Scooby with non-nackered Downpipe CAT & decat centre will easily pass an MOT.
A Scooby with non-nackered Centre CAT & Decat Downpipe sould pass an MOT after a spirited run (20 mins) to ensure the centre cat is up to full operating temperature.
I have heard of Fully decatted Scoobs - after a good run - passing an MOT if run High Octane (ie Optimax + RON Booster + Fuel Catalyst etc) - but this *IS* rare.
Chris.
PS - If you want performance & guaranteed MOT Pass look for High Flow CATs - Performance of a full Decat but with a single CAT capable of passing an MOT - expensive to buy - but in the long term probably cheaper than swapping pipes in and out for MOTs.
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