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removal of cat 300tdi


pinny
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Hi Pinny..... have a look at this thread (or try the 'search' button):

http://forums.lr4x4.com/index.php?showtopic=9443

The solid 300tdi front-pipe from a Defender is a direct replacement for the Disco one......

Dunk

hello has any body removed cat and replaced front pipe i have removed egr valve from turbo will removing cat make any difference in performance and will it affect mot i have a discovery 300tdi on a n plate
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hello has any body removed cat and replaced front pipe i have removed egr valve from turbo will removing cat make any difference in performance and will it affect mot i have a discovery 300tdi on a n plate

i've recently removed my egr valve and my 1995 300tdi passed it's mot no problem. maybe a slight increase in performance and fuel consumption (due to improved breathing i should think), but nothing to jump up and down about, i tend to drive fairy steady most of the time anyway. i dont know about the cat removal, i've been thinking about it myself but i'm not sure of the position with the mot. i read on another forum that a senior vosa inspector said this " if the vehicle was registered after sept 01 1992 and a cat was fitted when it was first registered then it must have a cat fitted to pass an mot otherwise it is deemed a fail" :( i dont know for sure though. anyone had a modded one go through a test? i'd have thought that so long as it passed emissions it'd be ok :blink:

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i've googled this for info and there's loads of confusing stuff, it dont take much to confuse me though :blink: but i think landymanluke is correct, maybe best just ask your local tester to be sure before you take it along for the test. :)

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as far as im aware its only petrol engines that had the emissions limits changed for the 'cat test'. i wouldnt swear to that but i believe its true, ring a MOT place & ask the smoke level that'd be tested on your car. for a non-cat its 3.5% (or 3% non-turbo, which doesnt matter for Tdis).

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AFAIK, If it's supposed to have a cat, it'll be tested according to cat emission regulations, as long as it passes, it doesn't matter if it has a cat or not.

im going to remove front pipe and replace with a non cat pipe its only 30 quid ill keep cat for mot if it fails if i copper ease studs it should come apart easier ill see if it makes any difference on performance

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AFAIK, If it's supposed to have a cat, it'll be tested according to cat emission regulations, as long as it passes, it doesn't matter if it has a cat or not.

removed cat today replaced with a defender front pipe fitted no problems bosal do make a front pipe with flexy pipe no cat for discoverys up to a 1998 its about 70 quid

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removed cat today replaced with a defender front pipe fitted no problems bosal do make a front pipe with flexy pipe no cat for discoverys up to a 1998 its about 70 quid

Hi I removed my cat front pipe and EGR from my disco es tdi auto some months ago, passed it'd mot no problem at all. If you think about it it's only the Autos that had them fitted, so the emissions won't be a problem as long as the lumps not knackered. Can't say it makes much difference to the performance but I never thrash it anyway so I couldn't really be sure.

One thing I did notice was that when I removed the EGR valve I found the inlet manifold was caked in crud, I believe this was a mixture of soot from the EGR valve and oil mist from the turbo combining. It was so bad I ended taking the inlet manifold off and cleaning it out in the parts washer, it was 5mm thick in places!! This was on a 100,000 mile engine, so it'd odviously built up over time. I was initially worried that the turbo was dying but was assured by turbo specialist that all turbo lose a tiny amount oil through their bearings, and normally this is nothing to worry about as the engine would just burn it with the intake charge, however if you mix this with the soot from a diesel exhaust, you get this sludge build up.

After doing all this work a friend noticed the same thing in his disco, however he just used one of those diesel restore sprays that you squirt into the inlet manifold, after removing you airflow meter. Worked lovely after that. However don't do it in your drive as he did, the smoke produced is amazing!!!

Greg

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Hi I removed my cat front pipe and EGR from my disco es tdi auto some months ago, passed it'd mot no problem at all. If you think about it it's only the Autos that had them fitted, so the emissions won't be a problem as long as the lumps not knackered. Can't say it makes much difference to the performance but I never thrash it anyway so I couldn't really be sure.

One thing I did notice was that when I removed the EGR valve I found the inlet manifold was caked in crud, I believe this was a mixture of soot from the EGR valve and oil mist from the turbo combining. It was so bad I ended taking the inlet manifold off and cleaning it out in the parts washer, it was 5mm thick in places!! This was on a 100,000 mile engine, so it'd odviously built up over time. I was initially worried that the turbo was dying but was assured by turbo specialist that all turbo lose a tiny amount oil through their bearings, and normally this is nothing to worry about as the engine would just burn it with the intake charge, however if you mix this with the soot from a diesel exhaust, you get this sludge build up.

After doing all this work a friend noticed the same thing in his disco, however he just used one of those diesel restore sprays that you squirt into the inlet manifold, after removing you airflow meter. Worked lovely after that. However don't do it in your drive as he did, the smoke produced is amazing!!!

Greg

thanks for that removed cat yesterday front pipe for a defender bolted straight on cant rearly tell if any difference in performance appears to sound a little bit more throaty egr has been off for about 3 weeks as you said plenty of carbon in inlet manifold ive been told that 10k spray will remove this without removing manifold after i had took manifold off maybe silicone hoses will be next i also washed out intercooler which had some oil inside probably from turbo as you said it had a new head pistons and liners injectors when i got vehicle

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I have had my Cat and EGR removed from my 1995 300tdidisco since i have had it( nearly 3 years now) .Better mpg and smoother running is the result.

Never had any issues with MOT.As far as we are aware at work the emmision regs for all TDi Discos has no requirment for cat's or EGR.

And all 300tdi discos were fitted with cats auto or manual.

In fact you can do this with TD5 disco and defender as well and still pass MOT.

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In answer to my own question of, is a defender 300TDi downpipe (ESR2297) a direct replacement for a discovery 300TDi cat downpipe (ESR3495)? I can now confirm that it is, as I have today fitted one to my truck.

hello all, does anyone know if ESR2297 is the correct part number for the defender pipe to fit in place of the disco cat as white90 writes above, only when i asked at my local stockist they said it would be too short but maybe they just want to sell me the more expensive disco one? it does look the same in the defender parts catalogue, just wondered if anyone knew for sure. mine's a 1995 300 tdi es with the MA chassis number prefix. ta in advance. :)

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As stated I in the 300 TDi downpipe removal topic I linked to above, The ESR2297 downpipe is the one I used when I replaced my CAT downpipe, If anything I found that the overall length of the system was slightly longer using the defender downpipe. I ordered my from paddocks using that part number.

HTH

Pete.

(P.S White90 only put the topic in to the archive)

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the cat has been off for a week now also egr valve has gone i know its early but it has been 5 pound cheaper to fill up this week still done same mileage as last week let me know if any one has noticed any difference

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hello, just finished fitting the defender downpipe, no problems at all :D cost just over 17 quid plus vat which represents a huge saving over the cat. thanks for the advice chaps. ;) waiting for new spring seats now and i'll get my suspension done next week.

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hello, just finished fitting the defender downpipe, no problems at all :D cost just over 17 quid plus vat which represents a huge saving over the cat. thanks for the advice chaps. ;) waiting for new spring seats now and i'll get my suspension done next week.

mine been on for about 2 weeks sounds better and a reduction in fuel consumption hard to say if any difference in performance

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well it's a bit too early to tell but having got rid of the cat for a couple of days and just having been for a bit of a burn this evening i'd swear the disco was picking up a good bit quicker from low revs, maybe i'm just tryin harder but from the look of it i'd say it was the original cat which at 132000 + miles must have been a little clogged up to say the least and i did drain off a large quantity of water from the fuel sedimenter today, dont know what effect if any that would have. i also washed it today so obviously it's a lot lighter as well. ;) will try to clean sedimenter again tomorrow if i have time and see if that helps. have to go and put moisturiser on my hands now as i ruined my marigolds doin the sedimenter and my hands dont like soapy water. :D

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  • 1 month later...

took the old cat apart today just to be snouty with all the little pieces it must be a restriction on exhaust but its a lot better without it well carboned up hands very dirty made a mess but that will teach me for being snouty chris

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