JackyBoi Posted October 7, 2014 Share Posted October 7, 2014 Okay quick question about the J-Spec Supra. I've had mine imported from Japan into the UK permanently (it's a 51 plate) and I've heard from some people that you are allowed to double-decat a J-Spec Supra because it is exempt from specific UK laws, but I've also heard from others that this doesn't matter and that you must have both cats installed to drive it on the road. Who is right? Can I take both my cats off and still drive it on the road/pass an MOT? Or must I always have both cats on to drive on the road? Any help would be hugely appreciated as I'm stuck between buying and not buying the decat pipes from Whifbitz! Thanks Link to comment Share on other sites More sharing options...
ShawnPreece Posted October 7, 2014 Share Posted October 7, 2014 you have to have the Cats on to pass MOT on any car manufactured 1993 onwards regardless of whether its imported or not, just get a straight through decat pipe and stick the Cats back on for your MOT Link to comment Share on other sites More sharing options...
Ric Posted October 7, 2014 Share Posted October 7, 2014 you have to have the Cats on to pass MOT on any car manufactured 1993 onwards regardless of whether its imported or not, just get a straight through decat pipe and stick the Cats back on for your MOT No you don't There is no emissions data for a Jspec supra.. so they just test you on the standard emissions data, whatever it is, 3% (cat test is like 0.2%) A supra with decat running OK will be under 3% Link to comment Share on other sites More sharing options...
ShawnPreece Posted October 7, 2014 Share Posted October 7, 2014 No you don't There is no emissions data for a Jspec supra.. so they just test you on the standard emissions data, whatever it is, 3% (cat test is like 0.2%) A supra with decat running OK will be under 3% Really?? iv always been told anything post 1993 has to have them. Awesome il try mine fully decat next time then Link to comment Share on other sites More sharing options...
Ric Posted October 7, 2014 Share Posted October 7, 2014 I could be wrong, perhaps PM Benji, he's a tester and knows his stuff, but I think I was roundabout right Link to comment Share on other sites More sharing options...
SupraP-Z Posted October 7, 2014 Share Posted October 7, 2014 A lot of people keep the cats and stick them in for MOT, but its a hassel. My jspec NA has failed twice on emissions on a double decat, but passed the third time with no changes whatsoever. Might just have been a dodgy MOT place, take it to a friendly one, it'll be fine! Double decat it and enjoy! Link to comment Share on other sites More sharing options...
The Raven Posted October 7, 2014 Share Posted October 7, 2014 They dont have the emissions for a Jspec. If they fail it they have probably put it though as a uk car. Which is wrong a Jspec should pass an MOT without cats Link to comment Share on other sites More sharing options...
ShawnPreece Posted October 7, 2014 Share Posted October 7, 2014 Im glad iv seen this thread it will save me some time and hassle every time my MOT is coming up now Link to comment Share on other sites More sharing options...
jim Posted October 7, 2014 Share Posted October 7, 2014 This is a good thread on the subject, particularly the flow chart on page 1 posted up by Nic http://www.mkivsupra.net/vbb/showthread.php?277511-Catalytic-Converter!-Yes-or-No&highlight=flow+chart From what I can gather, if the car's post 1 August 95 and not specifically on the database (ie an import) it still has a cat test, which means it's done on default limits and includes a visual inspection to ensure the cat is in place. I could be wrong though... Link to comment Share on other sites More sharing options...
SupraLEDrears Posted October 7, 2014 Share Posted October 7, 2014 No you don't There is no emissions data for a Jspec supra.. so they just test you on the standard emissions data, whatever it is, 3% (cat test is like 0.2%) A supra with decat running OK will be under 3% What he said. I passed on emissions and only failed cause the exhaust was too loud. Sorted that with a bung insert. Link to comment Share on other sites More sharing options...
JackyBoi Posted October 7, 2014 Author Share Posted October 7, 2014 Thank you so much guys. Double-decat pipes have been ordered along with restrictor ring Link to comment Share on other sites More sharing options...
Dan_Turism0 Posted October 7, 2014 Share Posted October 7, 2014 (edited) a imported 2JZ-GTE will have emissions data because the engine was sold in the same car in the UK, a NA pre July 94 has to pass a non-cat test therefore higher emissions because there was never a UK NA Supra http://imagizer.imageshack.us/a/img404/7559/picture1sf.jpg Edited October 7, 2014 by Dan_Turism0 (see edit history) Link to comment Share on other sites More sharing options...
jim Posted October 7, 2014 Share Posted October 7, 2014 mmm...but they're not an exact match - uk spec was different to jspec Link to comment Share on other sites More sharing options...
Ric Posted October 7, 2014 Share Posted October 7, 2014 UK spec had egr valves etc to help with emissions they should not test a jspec as this Link to comment Share on other sites More sharing options...
The Raven Posted October 7, 2014 Share Posted October 7, 2014 Ive had this out with them before. The try and run it as a UK spec........Ive even see them try to run a N/A using uk spec data. The Jspec isnt the same as the UK therfore you cant get exact match bit that is in bold above Link to comment Share on other sites More sharing options...
Delboy52 Posted October 7, 2014 Share Posted October 7, 2014 The tester I used last time went by the year and engine code on the plate. My 1994 used to have a 2JZ-GE so not on the list and regardless of what engine is actually fitted to the car it is tested as a pre 95 with a non specific engine. Mine is a thumping V8 with no cats, emission test sailed through. I didn't try to hide anything to the tester, he was very clear that it should be tested this way. Had the Supra been a 1995 though I'd be stuffed. Link to comment Share on other sites More sharing options...
Thomas_germany Posted October 8, 2014 Share Posted October 8, 2014 What's the point of being catless, if you got to use a Restictor Ring on the J-Spec twins. I dumped the RR and am using a 100CPI cat instead, since I need a cat in germany anyways. All with a 2,5'' down- and midpipe. Link to comment Share on other sites More sharing options...
Delboy52 Posted October 8, 2014 Share Posted October 8, 2014 For me, it would've been more expense to build the cats back into the system. However you just sparked a thought. Would it be illegal to drive a UK registered car that has no cats but has passed all MOT inspections in foreign territory such as Germany? Link to comment Share on other sites More sharing options...
Thomas_germany Posted October 9, 2014 Share Posted October 9, 2014 If I, as a german, have no cat and get cought, I'm in BIG trouble. Since we pay our taxes by the emission class our car has and a catless car decreases this class, I'd be paiing to less tax. So that's considered to be tax dodging. If you do that with your UK-reged car as a non german, that shouldn't be a problem - I think. Link to comment Share on other sites More sharing options...
Supraleeturbo Posted October 9, 2014 Share Posted October 9, 2014 Just find a friendly mot place Link to comment Share on other sites More sharing options...
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