1.9 TDI owners with a decat - Are you still passing MOTs?

[Stonedofmoo]

Hi guys
I'm well aware the MOT tests are more stringent these days, you cannot have an obvious decat straight pipe in place and expect to pass an mot.
What about the pipes designed to look 'stock(ish)' like these

Does anyone have one fitted to their 1.9 TDI, and are you getting any issues with an MOT test since having it installed? I'm inclined to think this would pass a visual check and as long as the smoke test was OK you should be good to go, but I'd be interested to hear some real world results.

 

[Gazwould]

No problem at all .

 

[Stonedofmoo]

No problem at all .

View attachment 254380

Interesting, that's good to know! You're actually getting better results than mine WITH the stock CAT in place!
Gazwould do you have the same pipe?

 

[Gazwould]

Nope , custom 2.5" stainless .

Other reasons for such a low score is , egr delete , 507.00 , JASO FB 2 Stroke oil , 2-EHN and a new thermostat .

 

[Stonedofmoo]

Regarding your other mods I have/use all but the 2 stroke oil, that's a new one on me.

What brand oil do you use, and how much? I'm assuming the 2 stroke has some lubricating or cleaner burn properties?

 

[Gazwould]

That alone halved my mot smoke opacity test from 2.0 to 1.0 , but the underlying issue was a bad thermostat .

The 2 Stroke is a mineral based low ash and acts like a Cetane number booster to lessen diesels combustion lag so more complete combustion of diesel fuel molecules occurs so therefore less incomplete fuel molecules ( soot ) .

I put in both my diesels around 200ml 2T and 40ml 2-EHN in pre made up used Redex bottles and now and then Redex itself , waaaaaaaaaaay cheaper than the con that is premium diesel .

 

[Stonedofmoo]

Good information, I'll do further research. Is that 200ml / 40ml to a full tank?

 

[Gazwould]

Yes , 3/4 fine too .

 

[quattrogone]

Gaz you almost make me want to buy a diesel again just so I can play the chemist!