Decat

I'm going BPU and most people say on a JDM to double decat, but surely my emissions wont pass the MOT will they? Why is everyone recommending to do this when I will surely get F'd in the A on my next test? Am I missing something? Are Supes now so old that emissions are very generous on them for the MOT?

What year is your Supra? Pre-96 tests are different and emissions will pass even on double decat. Older than 96 and the test changes so might be struggling, friendly MOT man is always a help in this situation

I thought your car was already BPU as you said it was boosting to 1.5 bar...

I've been planning to go Na-t for a few years and nearly ready financially, however I am also facing this problem. Mine is a 96 import so I think I will certainly have issues. I also believe that even if your car passes the emission test, if a cat was present before and has been removed, it will fail the MoT.

For myself, finding a friendly test centre OR putting the old cat back each year both seem unlikely ..

I've been planning to go Na-t for a few years and nearly ready financially, however I am also facing this problem. Mine is a 96 import so I think I will certainly have issues. I also believe that even if your car passes the emission test, if a cat was present before and has been removed, it will fail the MoT.

 

For myself, finding a friendly test centre OR putting the old cat back each year both seem unlikely ..

I'm a 96 NA-T and thankfully had a friendly tester. There's a bit of confusion around it though as a JDM car doesn't register exactly on the database, only UK specs. So the criteria changes if a tester goes through this process properly.

I'm a 96 NA-T and thankfully had a friendly tester. There's a bit of confusion around it though as a JDM car doesn't register exactly on the database, only UK specs. So the criteria changes if a tester goes through this process properly.

Yes I have heard the testers often use the wrong base car which has higher controls and results in failure... I'm ok with this side, it's more the fact if a cat has been removed it's a fail.. Would fitting a sports cat be a workable solution?

Mine is a 93 TT Import I was wondering if emissions would be lenient for such an old car, is this the case then?

It was, the fuel cut system was banging in every time I put my foot down for more than a second. The previous owners (or abusers I should say) had installed boost blocks making the turbos madly overboost. Needless to say I immediately removed this dangerous addition but now I want to upgrade the car properly

- - - Updated - - -

If anyone wants the boost blocks to make it boost to about 1.5 they're welcome to them by the way.

Style - do you mean Younger than 96 the test changes by the way?

I'd love to join the forum and happy to pay, I've just looked though and cant seem to find where on the site it is?

I'm running double decat on my 1993. It passed the emissions on the MOT with a non cat test due to them not having the correct 'type' of Supra on the system

2JZ-GE (non turbo) doesn't need a cat for an MOT regardless as it's not a recognised engine on the uk system. The 2JZ-GTE will need a cat as it is recognised since it was sold in the uk. A lot of people (myself included) run decaf and then put the car back on for the mot and then remove again...or if you're lucky then find a friendly MOT tester

If you go to settings at the top, then paid subscriptions on the left, think you can sort things from there.

Style - do you mean Younger than 96 the test changes by the way?

Yeah a TT made before 1996 is subject to a standing idle test only which makes passing emissions much easier. A TT made after 1996 gets a stricter test and, as drift_bear said, all NA's SHOULD get standing idle tests as far as I'm aware. It's a bit of a grey area really when it comes to emissions

Brill I might get double decat and put some random box shroud round it then and see what happens. Thanks for the help Style. And Anabella you made me join the forum as a paid up member so you should be on a percentage or something

Heh welcome to the club!