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200 Series General Forum for the Volvo 240 and 260 cars |
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CAT removalViews : 1804 Replies : 26Users Viewing This Thread : |
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Sep 22nd, 2019, 08:32 | #1 |
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Location: Cheshire
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CAT removal
Hi again,
I looked into this a few years ago but want to check again. My exhaust is ropey and blowing worse each week from several places. Ideally I'd like to replace it with something a bit better flowing, see if we can realease a few extra bhp. Simons and Jetex both seem popular 'Sports' systems. However, my car being 1991 has a CAT. B230f. Many of these sports systems are for non cat earlier cars. A few years ago when i investigated it sounded like legislstion dictated that if a car was built before X month in 92 (or something or other) then the cat could be removed. Obviously i'd then get a boss welded onto the new exhaust for the 02 sensor. Anybody know what the current regs say? Thanks |
Sep 22nd, 2019, 10:32 | #2 | |
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Sep 22nd, 2019, 16:39 | #3 |
Not an expert but ...
Last Online: Yesterday 12:45
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If you get the right downpipe there's a socket for the sensor anyway.
The genuine Volvo one I fitted a few years ago had a blanking plug screwed in, as I was keeping the cat. |
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Sep 22nd, 2019, 19:36 | #4 |
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Thanks guys.
I need to check with my local friendly garage really. Partsforvolvos do a Jetex and apparently Brookhouse can get a Simon's. Not sure which is best. |
Jun 9th, 2021, 19:45 | #5 | ||
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Reviving this useful old thread please.
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Can one buy a pipe with a boss fitted? A straight pipe with a boss, to fit instead of the cat. I seem to remember that one could do that. If I have to get a boss welded on, is it a standard boss for sensors on any car, or? And as I probably need a sensor. Where can I get a good one, obviously I will check with a dealer first. I must look to see if I need any wiring. Someone has stolen my catalytic convertor. Cut off each side of the cat. Stephen .
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The most savage controversies are those about matters as to which there is no good evidence either way. —Bertrand Russell Last edited by Stephen Edwin; Jun 9th, 2021 at 19:53. |
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Jun 10th, 2021, 10:17 | #6 |
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I've had a look and it is, promising. A little bit promising.
There is a hexagonal head about four to six inches forward of the forward CUT. Time to start applying Plus Gas I think. It looks online as if the sensor, Oxygen Sensor?, comes with a connector and a length of wiring. I think I need the three wire version for my January 1992 car? Is there any experience in the forum between Volvo Branded sensors and reputable other brands please? EDIT Feeling just a little calmer BUT. I hear there have been social media warnings of convertor thefts in the area, AND a neighbour couple actually saw it happen to my car! They did NOTHING!!! Nuf said ... Stephen .
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The most savage controversies are those about matters as to which there is no good evidence either way. —Bertrand Russell Last edited by Stephen Edwin; Jun 10th, 2021 at 10:21. |
Jun 10th, 2021, 10:55 | #7 |
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okies
my garage, not 240 experts but they have their virtues. Say without the catalytic convertor I don't need a sensor. They might be, mistaken? So if they fit a length of pipe and discover it needs a sensor, I guess that can be fitted and while a sensor is obtained perhaps the car will be back on the road? Stephen .
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The most savage controversies are those about matters as to which there is no good evidence either way. —Bertrand Russell |
Jun 10th, 2021, 11:30 | #8 |
Not an expert but ...
Last Online: Yesterday 12:45
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I'd have thought you'd need a sensor in order to ensure that the computer got the right input? With no sensor but with a system designed to run optimally with a sensor, it would be like permanently being in limp-home mode?
The catalyst has no actual connection with the sensor - it's just a convenient bit of pipe to hold the boss. Some models have the sensor in the downpipe just upstream, some I think have the sensor near or even in the exhaust manifold. Whatever the catalyst does to the exhaust the sensor is always up stream so it can't know about that, so the decisions on whether to remove either the catalyst or the sensor are surely entirely separate. Removing the cat is a purely mechanical one - how do you connect up pipes to bridge the gap - but removing the sensor would need more fundamental tweaking of the control system, seemingly pointless anyway. Just my thoughts - I've no real knowledge. |
Jun 10th, 2021, 12:02 | #9 | |
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To get the best out of what you have you will need a lambda sensor. I prefer to keep to Bosch but some of the cheaper ones work. Do not waste your effort with a universal sensor. The correct Bosch https://www.classicswede.co.uk/Lambd..._14206088.aspx or if you want cheap and cheerful https://www.classicswede.co.uk/Lambd..._20715522.aspx |
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Jun 14th, 2021, 10:59 | #10 |
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Hello.
I suspect I will end up getting the pipework done, and then fitting a sensor to the down pipe myself. I am applying PlusGas to the blanking plug daily. There appear to be two Bosch items available and no indication as to engine type or year &c variations. One type has vehicle specific plugs to fit so that looks favourite. Can anyone advise, including part number(s) please? Where is the sensor connected, where will I find the connections please? If the car is driven with a pipe instead of a catalytic convertor EDIT: but without a sensor temporarily, will the car be simply less efficient, or worse, please? Any specific advice or experience please? Thank you all Stephen .
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The most savage controversies are those about matters as to which there is no good evidence either way. —Bertrand Russell Last edited by Stephen Edwin; Jun 14th, 2021 at 12:13. |
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