Discussion
Never had a problem with mine, just warm it up before the test. There are rather a lot of us running without pre-cats for a long time now.
TBH I can only recall a single thread where it was claimed removing pre-cats would fail MOT - theres always one
If your main cat is really foobarred it is possible I guess, but when the cat is worn I believe it is also pretty blocked & should be renewed anyway (like driving with a rag shoved up your exhaust).
Dave
TBH I can only recall a single thread where it was claimed removing pre-cats would fail MOT - theres always one
If your main cat is really foobarred it is possible I guess, but when the cat is worn I believe it is also pretty blocked & should be renewed anyway (like driving with a rag shoved up your exhaust).Dave
.I never had a problem with mine removed(done it with 2 cars),even running a H404 cam!I think as long as everything else is in good fettle you'll have no worries.
dnb said:
steve-V8s said:
dnb said:
Remember that you don't have to pass a standard BET emissions test, even in a late 500. 
Why so ?After a chat with the local MOT Man My understanding is this :-
After Aug 1992 the vehicle has to comply with the “Basic Emissions Test”, this test requires the car to be at normal operating temperature and as the pre cats deal with emissions during the warm up process they can be removed and the basic test still passed. It is unlikely however that the basic test requirements will be met with no cat fitted regardless of the fuelling. The test does not specifically require the cat to be fitted it is just unlikely that it will pass without.
However if either the chassis or the engine was first used prior to Aug 1992 the car is tested to the earlier requirements which can be met without any cats.
I have heard an argument that unless an exact match for the vehicle type is found in the database the less stringent test applies, I think however this exemption applies to a different class of vehicle.
If we do have a TVR specific loophole then please tell us, we really do need to know.
After Aug 1992 the vehicle has to comply with the “Basic Emissions Test”, this test requires the car to be at normal operating temperature and as the pre cats deal with emissions during the warm up process they can be removed and the basic test still passed. It is unlikely however that the basic test requirements will be met with no cat fitted regardless of the fuelling. The test does not specifically require the cat to be fitted it is just unlikely that it will pass without.
However if either the chassis or the engine was first used prior to Aug 1992 the car is tested to the earlier requirements which can be met without any cats.
I have heard an argument that unless an exact match for the vehicle type is found in the database the less stringent test applies, I think however this exemption applies to a different class of vehicle.
If we do have a TVR specific loophole then please tell us, we really do need to know.
spend said:
Are you exempt from emissions with L110 Mike? The chassis must be pretty early - does that qualify? ie date of original build vs engine date?
Dave
It's a 93 car,even the chassis build date.If you have a TVR registred before 1st Aug(not sure exactly)1995 then it gets tested the same as a pre-catDave
(probably just as well!
The AJP Griff said:
spend said:
Are you exempt from emissions with L110 Mike? The chassis must be pretty early - does that qualify? ie date of original build vs engine date?
Dave
It's a 93 car,even the chassis build date.If you have a TVR registred before 1st Aug(not sure exactly)1995 then it gets tested the same as a pre-catDave
(probably just as well!Not many folks bother to check,but I think in a thread we discussed a few years ago it seemed many chassis dates were older than the reg date. They are encoded so it is well worth knowing your chassis date for these test procedures BTW.
Dave
I can't find the document, but it does exist on the VOSA website somewhere... It's a TVR specific exemption, and I used it last year to try to get my Griff through with NO cats at all. (Passed fast idle, but failed slow idle.) All you get is a concession on the lambda parameters - a Griff is allowed between 1.1 and 0.9 IIRC. (A Cerb is basically allowed anything that is combustable )
Of course you can only take maximum advantage of the concession with a mappable ECU.
On a positive note, since the MOT stations all have the fancy computer system, if the car fails the BET test, the emissions machine should automatically give the tester the option to do the TVR test - no need to present any other evidence than a good V8 growl and a TVR badge.
(Passed fast idle, but failed slow idle.) All you get is a concession on the lambda parameters - a Griff is allowed between 1.1 and 0.9 IIRC. (A Cerb is basically allowed anything that is combustable )Of course you can only take maximum advantage of the concession with a mappable ECU.
On a positive note, since the MOT stations all have the fancy computer system, if the car fails the BET test, the emissions machine should automatically give the tester the option to do the TVR test - no need to present any other evidence than a good V8 growl and a TVR badge.
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