UK Spec MOT ??

[Grizzly]

Hi all.

We\'re getting ready to MOT a tuned single Turbo UK spec fd and have hit a bit of a wall, i was looking to see what the target Emissions should be for a pass and i\'ve been told its 0.3 co lol is this right?

The odd thing is i have a Jap spec FD of the same year and that has a target Co of 3.5 which is achievable. The big question i suppose is how do they tell which version of the test required? is it purely down to Uk or Jap or do they go of engine numbers etc? (be handy if they do as its recently had a rebuild)

My next question is, if it does indeed have to meet the 0.3 rules how on earth do i get it that low? would Fitting a cat and Adjusting the Apexi voltage get me close? or is this going to get more drastic?

[dthebuk]

I guess you could say its got a japanese engine in it?

When ive had cars with engine conversions mot\'d and they\'ve tested based on the engine.

Sounds like a load of hassle tbh, I\'d just look for a friendly mot tester

[Grizzly]

we had a play with it today and i think its possible to get the emissions down that much but i\'ll have to put a cat of some sort on as thats a requirement.

[johnm]

MOT test is based on date of first registration, if the engine is modified the test is carried out to the same limits as a non modified car, if the engine is from an older car the test is completed to the older car spec - but you have to prove the age of the engine to the tester.  Up to 31 July 92 the limit is 3.5% CO and after that date the general limit is 0.3% CO.

The UK spec RX-7 has a different test regime for the MOT to other cars, so make sure the tester is entering your reg number in to the test machine or changing it bring up an RX-7.  The speed for fast idle is different and I think the idle and fast idle CO limits are slightly in our favor.

A link to another website, getting a single turbo to pass an emissions test.
http://www.carforums.net/showthread.php?29496-Getting-an-RX-7-to-pass-emissions-testing

[Nik da Greek]

UK spec cars had a pre-cat in the downpipe as well as the main one under the car. Guess there\'s no chance of getting one of those to fit onto a single conversion! Also I would think the normal one wouldn\'t last long in a million degrees of single-fed rotary exhaust temperatures lol. They die pretty quick even if the airpump gets taken off on twins. Mind you, if all you have to do is frigg an MOT I guess you\'re not bothered much about longevity

[Grizzly]

Out of Interest when the PIM voltage is dropped to say 80% how much risk is involved? what i\'m trying to say is its not going to blow up trying to get off the brake tester?

Regarding the Cat, Does that help reduce the CO or Hydrocarbons? i\'m just thinking that if i put a cat on i may be able to leave the Pim % a little higher while having the desired effect, but if the Cat does nothing for the Hydrocarbons but drops the CO then i would be setting myself up for a fail.