MOT and 2T Premix

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Stevie_P
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MOT and 2T Premix

Post by Stevie_P » Tue Jan 03, 2017 3:14 pm

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.

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Re: MOT and 2T Premix

Post by Phil Bate » Tue Jan 03, 2017 3:27 pm

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 » Tue Jan 03, 2017 4:24 pm

That's the answer I like to hear.

Thanks

Steve

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Re: MOT and 2T Premix

Post by warpc0il » Tue Jan 03, 2017 5:39 pm

: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 » Mon Mar 06, 2017 4:49 pm

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.
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Re: MOT and 2T Premix

Post by Dr. FrankenRex » Mon Mar 06, 2017 4:55 pm

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 » Mon Mar 06, 2017 5:21 pm

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 » 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 ;)
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Re: MOT and 2T Premix

Post by Glen Mc » Mon Mar 06, 2017 8:15 pm

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 » Tue Mar 07, 2017 8:24 am

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 » Tue Mar 07, 2017 8:26 am

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 » Tue Mar 07, 2017 9:10 am

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

Post by tekkendp » Fri Mar 10, 2017 12:45 pm

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

Post by RenesisRaceBuggy » Fri Mar 10, 2017 1:09 pm

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 » Fri Mar 10, 2017 1:11 pm

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 » Fri Mar 10, 2017 1:12 pm

It would still help on the R3.

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Re: MOT and 2T Premix

Post by Plan3tBob » Mon Jul 16, 2018 12:28 pm

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 » Mon Jul 16, 2018 1:04 pm

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 » Mon Jul 16, 2018 1:11 pm

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 » 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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Re: MOT and 2T Premix

Post by Juey » Mon Jul 16, 2018 1:39 pm

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 » Mon Feb 25, 2019 11:28 am

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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i always wanted Q plate car - its unusual, different.


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

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