TubbyTwo Posted August 9, 2012 Share Posted August 9, 2012 Hi folks, Got the dreaded MOT coming up on the 20th, had a read through on here but just want a definitive answer, the car is a 1994 NA-TT. I assume I will need to replace the 2nd CAT for the MOT? Thanks. Si Quote Link to comment Share on other sites More sharing options...
R Black Posted August 9, 2012 Share Posted August 9, 2012 As far as I know, if it was built with it, it should still be on for MOT, some stations are friendlier than others though. I'm sure someone here knows for definite. I take it you meant replace the decat? Quote Link to comment Share on other sites More sharing options...
SteveC Posted August 9, 2012 Share Posted August 9, 2012 As of 1st Jan this year, if a cat was fitted when the car was built, then if it's missing that's a valid reason for a failure - or so I've read. It all comes down to the garage you take it to really - how they interpret the guidelines, how they feel on the day, if they like you or not etc etc. Mine passes without any cat fitted at the garage I take it to, other places would possibly fail it. Why not just ring a few MOT garages and see what they say. Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted August 9, 2012 Author Share Posted August 9, 2012 Ok thanks, will give a place a ring tomorrow. Assume an NA cat would suffice on an aftermarket TT system? Quote Link to comment Share on other sites More sharing options...
R Black Posted August 9, 2012 Share Posted August 9, 2012 My perception of MOT places is many/most wouldn't know what's standard, I would imagine if they see one cat they wouldn't be looking for another, unless the Shi.ny cat replacement is a giveaway Quote Link to comment Share on other sites More sharing options...
Japlover Posted August 9, 2012 Share Posted August 9, 2012 @SteveC comment - if somethings changed this year, this would explain why my old GTR got through the MOT with a de-cat still on a couple of years ago, I completely forgot to change it and it still passed.... Quote Link to comment Share on other sites More sharing options...
garethr Posted August 9, 2012 Share Posted August 9, 2012 http://www.motinfo.gov.uk/htdocs/index.htm The MOT manual actually says: Method of Inspection 3. On vehicles that qualify for a full cat emissions test, check the presence of the catalytic converter. Reason for Rejection 3. A catalytic converter missing where one was fitted as standard. So they only check for a cat if they are doing a full cat emissions test. It's not just about whether one was fitted as standard. Quote Link to comment Share on other sites More sharing options...
Pixelfill Posted August 9, 2012 Share Posted August 9, 2012 I had my MOT on Tuesday, and the tester told me that if it didn't have a cat fitted he wouldn't even test it! I told him that it did have one, but that it originally had two. He passed it so you shouldn't need both cats as long as one gets your emissions low enough, and this guy is not what you would call a "friendly" MOT tester (I routinely get advisories for "non-standard exhaust" and "noisy exhaust" This with a Blitz NuR Spec with baffle and centre CAT fitted, I think it purrs quite nicely.) I certainly wouldn't try without a CAT, mine is fitted all the time anyway as it works brilliantly as my restrictor ring. Mike Quote Link to comment Share on other sites More sharing options...
garethr Posted August 9, 2012 Share Posted August 9, 2012 I give up! Quote Link to comment Share on other sites More sharing options...
Pixelfill Posted August 9, 2012 Share Posted August 9, 2012 I presume this was because the car qualified for the full CAT emissions test Quote Link to comment Share on other sites More sharing options...
welshbuddy Posted August 9, 2012 Share Posted August 9, 2012 my car is a na-tt at the momentm just passed MOT, i Got cat on the downpipe which wasnt good enough, so had to put the 2nd one on aswell to pass. my car has now both cats on, but will soon be off when my single goes on ha Quote Link to comment Share on other sites More sharing options...
ADD Posted August 9, 2012 Share Posted August 9, 2012 My car was made in aug 94 and had the standard 2 cats on but I had my MOT on Monday and it passed with my decat, so I think it all depends on the station tbh Quote Link to comment Share on other sites More sharing options...
-Welsh-Stealth- Posted August 9, 2012 Share Posted August 9, 2012 Pre 31 July 1995= no need for cat 2JZ GE= no need for cat as its not in MOT documents. But 2JZ GTE is. So make sure testers know your engine NA owners. Had a look monday.Still need to pass emissions though, but I think it's 3.0% instead of the usual 0.5%... Quote Link to comment Share on other sites More sharing options...
Littler Posted August 10, 2012 Share Posted August 10, 2012 Mine passed in June with no issues with the 1st cat still in place iirc it registered 0.8% out of an allowance of up to 3.5%. Didn't get any loud exhaust advisories with the nur spec r on though Quote Link to comment Share on other sites More sharing options...
straightsix Posted August 10, 2012 Share Posted August 10, 2012 When I got my MOT on the V8 it passed with no cats as the car was originally an NA. I believe they check the chassis number against the database and not the engine number. I didn't go to a friendly test centre - it was just the only one that could fit me in quickly. Quote Link to comment Share on other sites More sharing options...
wallis Posted August 10, 2012 Share Posted August 10, 2012 If it's an import and pre 94 the emissions tests have a bit of a grey area, I've never had cats fitted and my cars passed 8 years in a row, even from bpu and going single. There's legal documentation on the Internet explaining that u can enter an imports chassis no. instead of engine no. at the test station during the emissions test on a pre 94 imported vehicle, because it's imported there's no engine data for it to fail on emissions so will pass. It's not breaking the laws of mot testing and doesn't apply to any uk supras or cars over the 93 year Unfortunatly ;-( In regards to an n/a test, I've seen loads of posts whete people get through with out cats on and pass emissions fine, doesnt an n/a run on hot air anyway??? ;-) Quote Link to comment Share on other sites More sharing options...
garethr Posted August 10, 2012 Share Posted August 10, 2012 The emissions test is decided by whichever is older, chassis or engine. There is a flowchart in the MOT manual (link posted above) that directs the tester to the correct test. Quote Link to comment Share on other sites More sharing options...
ubersonic Posted August 10, 2012 Share Posted August 10, 2012 People get caught up a lot on the import/non-import thing, the only real grey areas are vehicles that have had engines swapped, for a TT or an NA its actually pretty simple under the letter of the regs. If its a 2JZ-GTE (UK or JDM) then regardless of year it has a cat test carried out to vehicle specific limits as per VOSA guidelines (and requires a cat to be fitted as per the visual check of the cat test). If its an N/A then if it was made before the 31st of July 1995 it takes a non cat test (and doesn't have a visual check to see if ones there) and if it was made later than that it takes a cat test carried out to default limits (and requires a cat to be fitted as per the visual check of the cat test). One important thing that I don't believe anybody has mentioned yet though is that a default cat test is harder to pass than the Supra specific one for the 2JZ-GTE, the default limits test the idle at 450-1500 RPM and the fast idle at 2500-3000 RPM whereas the Supra specific one tests them at 600-700 RPM and 2400-2600 RPM respectively. So make sure your garage do the right one (unless your fluking a non-cat test ofc) or they may test the idles too high. Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted August 20, 2012 Author Share Posted August 20, 2012 Well MOT is booked for tomorrow, going to refit the second Cat tonight and see how it goes, the place im going to said they use the Chassis code which would make mine an NA. Tempted just to try it without the cat and see how it goes Quote Link to comment Share on other sites More sharing options...
bambisdad Posted August 20, 2012 Share Posted August 20, 2012 Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted August 20, 2012 Author Share Posted August 20, 2012 Looking at previous MOT certificate and emmisions test from August last year it was a non cat test. So should be fine, test report gave a reading of 0.152 for CO% and 112 for HC ppm vol. Quote Link to comment Share on other sites More sharing options...
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