hi everyone,what is the law regarding the catalytic converters on my 1993 disco1 v8. Are they a legal requirement. or were they just an option when the vehicle was new?Iwould like to replace them with a normal non cat system if this is legal and feasable. Any suggestions?
cat removal
- Thread starter philpridd
- Start date
This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
lerk
New Member
- Posts
- 1,763
- Location
- Creswell, Derbyshire UK
IIRC pre 94 they are not a requirement... but my memory is vague so don't trust me 100% on that!
Richard Martin
Well-Known Member
- Posts
- 1,371
- Location
- Cardiff
I don't know about the V8, but on the 300TDI you have to pass the emissions test at the MOT and you can pass it without a cat
V8Jay
New Member
- Posts
- 497
- Location
- Stockton on tees
do u have LPG????
sierrafery
Well-Known Member
- Posts
- 17,932
- Location
- Arad/Romania
As far as i know, on petrol cars if u remove the cat u'll have to remap the ECM addapting it for the new values cos the lambda sensors will give erratic inputs f***ing up the engine management......but dont trust me 100% either.
discool
Well-Known Member
- Posts
- 13,632
Cats are not a legal requirment on petrol engine vehicles and they are not an MOT testable item.
The exhaust emissions only are tested and if they do not exceed the levels for that particular vehicle/engine it will pass.
Exhaust emmissions on Tdi's are not tested only a smoke test is done on diesels.
The exhaust emissions only are tested and if they do not exceed the levels for that particular vehicle/engine it will pass.
Exhaust emmissions on Tdi's are not tested only a smoke test is done on diesels.
alex8882
Well-Known Member
- Posts
- 1,377
- Location
- lytham,st.annes
@discool Well you set me straight now lol. I always thought that any petrol engined car after 1992 had to be fitted with a cat under mot law.
discool
Well-Known Member
- Posts
- 13,632
Getting very flashy aren't we alex 
The only way a standard "modern" petrol engine can meet the emission rules now is with cat/s fitted even lean burn engines are fitted with them.
But if with the removal of the cat and then with engine modifications the emissions level for that engine are not exceeded so be it, that's ok.
The only way a standard "modern" petrol engine can meet the emission rules now is with cat/s fitted even lean burn engines are fitted with them.
But if with the removal of the cat and then with engine modifications the emissions level for that engine are not exceeded so be it, that's ok.
alex8882
Well-Known Member
- Posts
- 1,377
- Location
- lytham,st.annes
lol its the only way i can flash these days. Thanks for clearing that up for me advice taken on board
spanishlair
New Member
- Posts
- 294
- Location
- Inland Andalucia, Southern Spain
What benifit could you obtain by taking off the Cat. Its a 17 year old petrol V8, it will need all the help it can get to pass emissions. I can see the benifit/logic in a diesel... but petrol V8?
nathan5346
Well-Known Member
- Posts
- 11,939
- Location
- oldbury
Better noise n performance?
discool
Well-Known Member
- Posts
- 13,632
As nathan above, once there was a 3.5 and then restrictive cat's were introduce so what did LR do increase the capacity to 3.9.
So remove the restrictive cat's retune the engine to suit and wow more power so you have a fast or shall we say a faster vehicle.
But then does a disco 1 or 2 need this extra power?? No I don't think so but some do which is ok.
So remove the restrictive cat's retune the engine to suit and wow more power so you have a fast or shall we say a faster vehicle.
But then does a disco 1 or 2 need this extra power?? No I don't think so but some do which is ok.
V8_Disco
New Member
- Posts
- 1,180
- Location
- Shropshire
ive removed my cats and the rear silencer, then had a stainless mid section welded in. im just uploading a video ill see if i can get it to work
V8_Disco
New Member
- Posts
- 1,180
- Location
- Shropshire
disco2shaun
New Member
- Posts
- 1,137
- Location
- In the coldest caravan in Doncaster!
well your wrong!! catalytic converters are a legal requirement on petrol cars from 1997 onwards. also my old 300tdi defender failed its m.o.t at my work last week due to the emisions been to high and emitting to much smoke for a turbo charged engine. if you remove the cat from a petrol car you will have to replace it for when its due an m.o.t
oldskool
Well-Known Member
- Posts
- 3,116
- Location
- Essex near maldon
But a petrol engin won't pass a its emmission test without the cat if its supposed to have one, the only cars i know of thet didnt have cats fitted were susuki's cos they went the lean burn instead.
disco2shaun
New Member
- Posts
- 1,137
- Location
- In the coldest caravan in Doncaster!
sorry a legal requirement on a m.o.t test. we had a bmw m3 other day for an m.o.t and would it hell go through the emmisions because its had a de-cat
oldskool
Well-Known Member
- Posts
- 3,116
- Location
- Essex near maldon
1993 actuatly.
