John G
Member
Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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I have been told it lets the engine more freely and you dont actually need a cat in a diesel cat for it to pass an mot?? can anyone shed any light on this
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Nick-S
Member
Registered: 3rd Mar 04
Location: Leigh. Drives: RS Megane 230 F1 Team R26
User status: Offline
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i have no cat 
the dude at blueflame said it was like a ceramic brick blocking my exhaust 
oh it was alot more free reving after the system was put on
[Edited on 24-02-2008 by GSi_16v]
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Timbaland
Banned
Registered: 20th Jan 07
Location: Glasgow
User status: Offline
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Newer cars dont, But older deisils generally do.
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Steve X16XE
Member
Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
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Hmmm, thats good to know coz i'm sure that my cat is now FULLLL of oil. Bin it is then
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Nick-S
Member
Registered: 3rd Mar 04
Location: Leigh. Drives: RS Megane 230 F1 Team R26
User status: Offline
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technicaly no car needs a cat aslong as it passes the emissions test iirc?
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Timbaland
Banned
Registered: 20th Jan 07
Location: Glasgow
User status: Offline
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quote:
Originally posted by GSi_16v
technicaly no car needs a cat aslong as it passes the emissions test iirc?
Yeah, But most fail emissions without it (Petrol that is)
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Nick-S
Member
Registered: 3rd Mar 04
Location: Leigh. Drives: RS Megane 230 F1 Team R26
User status: Offline
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yer i no
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John G
Member
Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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so is there any chance a diesel would fail without one?
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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my van. 1.7d 2000 reg, on a b chasis, never had a cat. i always thought it shud have. and looking at diagrams it shud have had.
i put a bottle of redex that treats 4 tanks, in one full tank,. once a month, and always made sure it was fully serviced.
it passed its mot 0.01 which i think is the lowest emission you can get
plus cos it was fully serviced, it never smoked.
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TomSBD
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Registered: 22nd Jun 06
Location: Spalding, Lincs
User status: Offline
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the diesel emissions is tested on the soot coming from the exhaust and how dense it is so i can really see how removing a cat would make it go up unless its a particle filter which would filter out the soot and so lower the emissions
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John G
Member
Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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quote:
Originally posted by Adam-D
my van. 1.7d 2000 reg, on a b chasis, never had a cat. i always thought it shud have. and looking at diagrams it shud have had.
i put a bottle of redex that treats 4 tanks, in one full tank,. once a month, and always made sure it was fully serviced.
it passed its mot 0.01 which i think is the lowest emission you can get
plus cos it was fully serviced, it never smoked.
i put a shot of injecter cleaner cleaner in once a month, and i always make sure the oil is clean. tbh i havent looked if it has a cat either but im ashuming it does. Mine never smokes either, only time iv seen anythin is if i need to get out of a junction quick and i shift to 2nd gear quickly but onyl ever in 1st and its not black smoke at that
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Adam
Member
Registered: 1st May 01
Location: Hurstbourne Tarrant
User status: Offline
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Injector cleaner in the fuel system, clean out the air filter and before the MOT take if for a run to get the engine as hot as possible. should see you through the MOT
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Fad
Member
Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
User status: Offline
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quote:
Originally posted by John G
so is there any chance a diesel would fail without one?
It will fail if they look under the car and no CAT is present.
You could maybe have a box made up to go in its place to look like it had a cat or gut out the exisiting cat and refit?
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Matt L
Member
Registered: 17th Apr 06
User status: Offline
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quote:
Originally posted by Fad
quote:
Originally posted by John G
so is there any chance a diesel would fail without one?
It will fail if they look under the car and no CAT is present.
You could maybe have a box made up to go in its place to look like it had a cat or gut out the exisiting cat and refit?
why would it? if it passed on emissions then surely they cant fail you just for not having one
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Fad
Member
Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
User status: Offline
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Look I am not making this us I was told this my an MOT tester 5 minutes after he had spoken to the ministry about the issue
Not to mention if this was the case why is there a market for sport cats? Think about it?
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Matt L
Member
Registered: 17th Apr 06
User status: Offline
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wasnt being bitchy lol just wandering how they could fail you even though it has passed the emissions
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Fad
Member
Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
User status: Offline
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I do belive its down to legislation that all cars post 93 are required to have a CAT present regardless.
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ed
Member
Registered: 10th Sep 03
User status: Offline
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That is correct.
Also, if you remove the DPF which is part of the cat then you will be followed by a massive cloud of black smoke.
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Colin
Member
Registered: 4th Apr 02
User status: Offline
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One of the golfs I looked at had the cat removed (original gutted) & a larger inlet. I couldnt notice anything different tbh. Turbo whistle ounded louder....too loud infact!
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Fad
Member
Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
User status: Offline
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quote:
Originally posted by Colin
One of the golfs I looked at had the cat removed (original gutted) & a larger inlet. I couldnt notice anything different tbh. Turbo whistle ounded louder....too loud infact!
This is what I sugest to do as it still looks like you have a cat present.
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AdamF
Premium Member
Registered: 24th Apr 02
Location: Bexhill, East Sussex
User status: Offline
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all cars after 31/07/1995 must meet emission limits:
<0.30 co
<200 ppm hc
0.97-1.03 lambda (0.95-1.09 for rover and ford)
if a cat is not fitted and it meets these limits then it will pass the mot.
99.9% of cars will NOT do this therefore must have a cat fitted.
a cat not fitted in itself is not a fail
[Edited on 24-02-2008 by AdamF]
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ed
Member
Registered: 10th Sep 03
User status: Offline
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But isn't there something about police roadside checks and not having a cat?
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AdamF
Premium Member
Registered: 24th Apr 02
Location: Bexhill, East Sussex
User status: Offline
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no just roadside emission tests
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Fad
Member
Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
User status: Offline
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quote:
Originally posted by AdamF
all cars after 31/07/1995 must meet emission limits:
<0.30 co
<200 ppm hc
0.97-1.03 lambda (0.95-1.09 for rover and ford)
if a cat is not fitted and it meets these limits then it will pass the mot.
99.9% of cars will NOT do this therefore must have a cat fitted.
a cat not fitted in itself is not a fail
[Edited on 24-02-2008 by AdamF]
Local MOT tester said otherwise that it has to be present regardless. A few years ago on a cruise to brighton one of the lads off here got stopped and had a roadside inspection where he got done for having no CAT
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AdamF
Premium Member
Registered: 24th Apr 02
Location: Bexhill, East Sussex
User status: Offline
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some testers will say that as they know that it wont pass emissions without one but it doesnt need one for the test but it has to pass emissions.
the police proabably will try and prosecute for it as they dont no any better especially if your on a cruise as they try to prove a point.
also passing the mot doesnt make the car legal to drive on the road.
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