MOT and 2T Premix

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MOT and 2T Premix

Post by Stevie_P »

Hi

Tried a quick search but couldn't find the answer to this one.
Can I assume people don't continue to run premix for their MOT?
I would assume this would lead to an emissions fail?

So is the best advice to:
1. Run some cataclean through prior to the MOT
2. Give the car a good run and get everything up to temperature
3. Run no premix for the MOT
4. Keep your fingers crossed...

Any advice would be gratefully received.

Steve
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Re: MOT and 2T Premix

Post by Phil Bate »

Premix at the levels we use makes effectively no difference to the emissions - there is no need to skip it for an MOT :thumleft:
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Re: MOT and 2T Premix

Post by Stevie_P »

That's the answer I like to hear.

Thanks

Steve
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Re: MOT and 2T Premix

Post by warpc0il »

:whathesaid: regarding premix

Also make sure climate control, heated seats and heated rear window are all off during emissions test.
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Re: MOT and 2T Premix

Post by Stevie_P »

Phil Bate wrote:Premix at the levels we use makes effectively no difference to the emissions - there is no need to skip it for an MOT :thumleft:
Just to finish this thread. Car passed it's MOT on Friday with premix present and correct.
Really pleased. Advisory on the rear drop links but we all know they're made of chocolate correct? :D
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Re: MOT and 2T Premix

Post by Dr. FrankenRex »

warpc0il wrote:Also make sure climate control, heated seats and heated rear window are all off during emissions test.
Will that actually make that much of a difference?

Genuine question as I'd never really thought about it
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Re: MOT and 2T Premix

Post by warpc0il »

Yes, especially at idle these more than double the load on the engine and therefore significantly increase the emissions.
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Re: MOT and 2T Premix

Post by TenToSeven »

Or buy an import, de-cat it and take advantage of the rules to fly through the emissions regardless ;)
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Re: MOT and 2T Premix

Post by Glen Mc »

Phil Bate wrote:Premix at the levels we use makes effectively no difference to the emissions - there is no need to skip it for an MOT :thumleft:
Yep mine had a dose of pre mix Saturday and passed the MOT :D
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Re: MOT and 2T Premix

Post by dac69er »

TenToSeven wrote:Or buy an import, de-cat it and take advantage of the rules to fly through the emissions regardless ;)
i thought if you had an import and there was a uk equivalent, they can just do the same test as they would normally? even if there isnt an equivalent, they do the test based on the age of the vehicle and do a basic cat test. i cant see a decatted RX8 passing that!?

i have 3 other import cars, 2 are from 1990 and 1991 so just need a basic uncatted idle test (which they obviously pass) the other is an engine swapped car from 94 and he always moans at me that it needs a cat. am i missing something?
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Re: MOT and 2T Premix

Post by tekkendp »

Just a quick question, Cataclean and pre-mixing - is this a bad thing?

I used Cataclean - and I think it's good. Plan on doing this as a fairly regular thing, as I do a lot of town driving.
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Re: MOT and 2T Premix

Post by acegeezer »

I don't premix on the R3 :)
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Re: MOT and 2T Premix

Post by tekkendp »

acegeezer wrote:I don't premix on the R3 :)
Show off!!! ;)
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Re: MOT and 2T Premix

Post by RenesisRaceBuggy »

tekkendp wrote:Just a quick question, Cataclean and pre-mixing - is this a bad thing?

I used Cataclean - and I think it's good. Plan on doing this as a fairly regular thing, as I do a lot of town driving.
I certainly wouldn't want to be using it regularly, the cleaners in it pull the oil off the chamber walls...it's basically shedloads of solvent + paint thinners diluted in petrol. It's not great for the fuel lines, etc, either.
Last edited by RenesisRaceBuggy on Fri Mar 10, 2017 1:11 pm, edited 2 times in total.
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Re: MOT and 2T Premix

Post by acegeezer »

Ha ha.. I was told by one of our specialists premixing was optional, as the R3 has an additional injector .. and 3 years on with my car my latest compression test showed higher figures on both rotors, so........... ;)
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Re: MOT and 2T Premix

Post by RenesisRaceBuggy »

It would still help on the R3.
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Re: MOT and 2T Premix

Post by Plan3tBob »

TenToSeven wrote:
Mon Mar 06, 2017 5:31 pm
Or buy an import, de-cat it and take advantage of the rules to fly through the emissions regardless ;)
Apologies for the nooby question: But can someone please explain what this means? :)
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Re: MOT and 2T Premix

Post by AutoGibbon »

Afaik, imported RX8's aren't subject to the same stringent emissions requirements as those sold in the UK. Meaning you can remove the catalytic converter in favour of a straight pipe mid section, choke on the fumes/enjoy more free flowing exhaust, and still pass the emissions test when you put it through an MOT.
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Re: MOT and 2T Premix

Post by PeteH »

No idea. According to .gov.uk the emission test to import the car, and get it subsequently MOT'd will be identical to if the car was a UK car of the same age:

https://www.gov.uk/government/publicati ... #emissions

"The IVA standard for both spark and combustion ignition emissions is identical to the MOT standard so you can have the vehicle checked at a local MOT station before the inspection."
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Re: MOT and 2T Premix

Post by warpc0il »

You might get away with it if the car was on a Q plate but that has so many other disadvantages, like resale value and insurance.

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Re: MOT and 2T Premix

Post by Juey »

Post 1992 imports get tested the same as the UK equivalent. So a de-cat is still a no no.
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Re: MOT and 2T Premix

Post by Bex »

warpc0il wrote:
Mon Jul 16, 2018 1:34 pm
You might get away with it if the car was on a Q plate but that has so many other disadvantages, like resale value and insurance.

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(also , realised im commenting on old posts as im reading through the forum posts for info as my mot is due soon)