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Author Topic: New Exhaust .... With Pre-cat  (Read 2428 times)

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Proz

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New Exhaust .... With Pre-cat
« on: 29 May 2009, 19:58:24 »
Well i've taken the plunge and got myself a new cat and the best part is it comes with a pre cat where the usual standard aftermarket crap doesnt ....... now im praying im going to finally get shot of my cat efficiency code when i get it fitted some time next week ...... other thing is do i need a gasket set for it as it says you musn't use exhaust paste upstream of the cat ....
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Iain

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Re: New Exhaust .... With Pre-cat
« Reply #1 on: 29 May 2009, 20:21:31 »
Proz....

Is that the one that was on ebay a couple of days ago?
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Iain

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Re: New Exhaust .... With Pre-cat
« Reply #2 on: 29 May 2009, 20:25:39 »
If so mate,can you please take ALL details from it...i.e maker,part numbers etc......i emailed the one on ebay but he pushed for my registration number so i didn't bother,i beleive it was made by a company in Nottingham
Also can you tell me for definate if the front sensor bolts directly into the pre-cat? i have a explanation for the codes
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Re: New Exhaust .... With Pre-cat
« Reply #3 on: 29 May 2009, 20:33:59 »
Quote
If so mate,can you please take ALL details from it...i.e maker,part numbers etc......i emailed the one on ebay but he pushed for my registration number so i didn't bother,i beleive it was made by a company in Nottingham
Also can you tell me for definate if the front sensor bolts directly into the pre-cat? i have a explanation for the codes


I got it from here .....
http://stores.shop.ebay.co.uk/BuyPartsBy__W0QQ_armrsZ1

I think there part number is 90794

It has a lambda hole before the pre-cat and one after the main cat just before the bend in the pipe .

What is your explanation for the codes ?

Cheers


This is the actual one

http://cgi.ebay.co.uk/Cat-Catalytic-Converter-Vauxhall-Omega-2-2i-16v-99_W0QQitemZ270399215700QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item3ef50c9854&_trksid=p4634.c0.m14.l1262&_trkparms=%7C301%3A0%7C293%3A1%7C294%3A30
« Last Edit: 29 May 2009, 20:38:48 by Mark38 »
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Re: New Exhaust .... With Pre-cat
« Reply #4 on: 29 May 2009, 20:49:24 »
I got mine for less than £130 all in including postage ..... getting it put on for £30 .... i just hope it cures my P0420 code  :y
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pauldmackay

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Re: New Exhaust .... With Pre-cat
« Reply #5 on: 29 May 2009, 20:51:51 »
The original cat on the car would have had the 2nd lambda after the pre-cat not after the main cat, so this hopefully will do the job as everythings going through 2 cats before the 2nd lambda does it's reporting.

Seen this for sale too and have been considering it.

Hope it works!

« Last Edit: 29 May 2009, 20:52:46 by pauldmackay »
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Iain

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Re: New Exhaust .... With Pre-cat
« Reply #6 on: 29 May 2009, 20:53:18 »
Ok,i did a bit of online research and also spoke with a guy over here who makes stainless systems

The first sensor is effectively no use because...... on the factory set up the first sensor takes the measurement from the 'swirling' gases from within the pre cat box.
After it has been through the main cat and treated the measurement is then taken from the 2nd sensor.

As the aftermarket pipe has no pre-cat the gases travelled too fast 'past' the 1st sensor for it to take an acurate measurement.....

Both sensors measures in voltage so because the first sensor doesn't get an acurate reading the voltage fluxuates too wildly to be 'within tolerance' for the system of the car...

The set up should be...

1st sensor....voltage with rise and fall wildly
2nd sensor......voltage will be more constant

Because the 1st sensor is not getting a proper reading then the 2nd sensor will rise and fall wildly because it has nothing to compare it with (from the 1st sensor)

The EML will come on because the car's system registers that there is an emmision problem due to the fact that the first sensor is not getting a proper measurement reading,however it wont flash up a fault with the sensor because it is there and it itself is functioning properly
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Proz

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Re: New Exhaust .... With Pre-cat
« Reply #7 on: 29 May 2009, 20:53:32 »
Quote
The original cat on the car would have had the 2nd lambda after the pre-cat not after the main cat, so this hopefully will do the job as everythings going through 2 cats before the 2nd lambda does it's reporting.

Seen this for sale too and have been considering it.

Hope it works!


Yeah i really hope it works  :-/
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Proz

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Re: New Exhaust .... With Pre-cat
« Reply #8 on: 29 May 2009, 20:56:56 »
Quote
Ok,i did a bit of online research and also spoke with a guy over here who makes stainless systems

The first sensor is effectively no use because...... on the factory set up the first sensor takes the measurement from the 'swirling' gases from within the pre cat box.
After it has been through the main cat and treated the measurement is then taken from the 2nd sensor.

As the aftermarket pipe has no pre-cat the gases travelled too fast 'past' the 1st sensor for it to take an acurate measurement.....

Both sensors measures in voltage so because the first sensor doesn't get an acurate reading the voltage fluxuates too wildly to be 'within tolerance' for the system of the car...

The set up should be...

1st sensor....voltage with rise and fall wildly
2nd sensor......voltage will be more constant

Because the 1st sensor is not getting a proper reading then the 2nd sensor will rise and fall wildly because it has nothing to compare it with (from the 1st sensor)

The EML will come on because the car's system registers that there is an emmision problem due to the fact that the first sensor is not getting a proper measurement reading,however it wont flash up a fault with the sensor because it is there and it itself is functioning properly


The original set up has lambda before and just after the pre-cat so hopefully on this set up its going through both before the second sensor so should be nice and clean  :y
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Iain

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Re: New Exhaust .... With Pre-cat
« Reply #9 on: 29 May 2009, 21:02:11 »
The 2nd sensor is after the main cat is it not?
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Proz

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Re: New Exhaust .... With Pre-cat
« Reply #10 on: 29 May 2009, 21:04:14 »
Quote
The 2nd sensor is after the main cat is it not?

The second sensor is behind the main cat on this one but i belive on the original spec fitted at production the second was just after the pre-cat .... but i may be wrong  ..... maybe one of the admins would know what the original set up would have been :y
« Last Edit: 29 May 2009, 21:05:22 by Mark38 »
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Iain

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Re: New Exhaust .... With Pre-cat
« Reply #11 on: 29 May 2009, 21:06:08 »
I think its got to be after the main cat mate.....

Thats how it measures the emmisions is it not? once it has been treated by the main cat?
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Proz

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Re: New Exhaust .... With Pre-cat
« Reply #12 on: 29 May 2009, 21:12:03 »
I thought it was the pre cat that did the main cleaning up of the gasses and the main cat cleaned up anything that was left ..... one sensor before the pre and one after then gave the pre cat code when it lost its peak efficiency ......
Anyway on my new one the second lambda is after the main cat so it should be "cleaned " twice and hopefully stop the P0420  :y

There was a long thread on here a while ago about moving the second lambda to behind the main cat to help as well so thats why im sure the second was just after the pre cat on original set up  :y
« Last Edit: 29 May 2009, 21:14:38 by Mark38 »
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Iain

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Re: New Exhaust .... With Pre-cat
« Reply #13 on: 29 May 2009, 21:14:07 »
Hope so mate....if it works i'll get one

When you doing it??
 ;D :y
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Proz

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Re: New Exhaust .... With Pre-cat
« Reply #14 on: 29 May 2009, 21:15:24 »
Quote
Hope so mate....if it works i'll get one

When you doing it??
 ;D :y

Should be sometime this week coming so i'll let you know  :y
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