Decat GT TDI?

[Trekmeister]

Exhaust question: How many cats does a GT TDI 140 have, is it two, one on downpipe and the cat back? If so would having adecat downpipe make any difference when remapped to stage one and would this increase chance of failure at MOT (Emissions etc?)

Thanks in advance

Paul

[vRSAlex]

Just the one cat on the pd140.  Straight after the turbo.  I've found that they smooth out the boost and allow the car to rev better.

No issues at mot as they don't test emissions on dervs, just soot test.

[Trekmeister]

Just the one cat on the pd140.  Straight after the turbo.  I've found that they smooth out the boost and allow the car to rev better.

No issues at mot as they don't test emissions on dervs, just soot test.

I was under the impression the GT has a cat back

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[vRSAlex]

They call the exhaust section that goes from the cat section the 'cat back'.  So if the cat is in the downpipe then the rest of the system is called the cat back.

[Trekmeister]

They call the exhaust section that goes from the cat section the 'cat back'.  So if the cat is in the downpipe then the rest of the system is called the cat back.

That makes sense now, would removing the cat be recommended, would it give any performance enhancement and would it increase soot coming out the rear?

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[Andy]

I have a full milly on mine,with out the cat.the car revs a lot better,the only time it smokes is when first started when cold but soon goes away  with no smoke out of mine,read my build thread,pics in there of my exhaust

[Trekmeister]

Is it true that new MOT rules state if a cat is removed when one was fitted as standard will now become a fail?

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[Andy]

Not on a diesel

[GNJ_Motorsport]

Interesting to see what people have done to their 140 TDI's as I think I'll be buying one when I pluck up the courage to sell my S3. I'll be happy with 40+mpg and 180bhp and a load of torque I think for a couple of years.

I've never heard one with a Milltek on, what is the advantage sound wise?

[Andy]

The sound it gives out is  a nice throaty sound but its very quite on the motor way,mpg I got 56

[Trekmeister]

The sound it gives out is  a nice throaty sound but its very quite on the motor way,mpg I got 56

56mpg, at what sort of speed, 55mph?

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[Jogon]

I've got a de-cat full milly , very happy with mine , can't really hear it through town , but up to 3500 revs it sounds good , but after that it sounds the t:ts.

My motor has kept up with focus st's and returns 50+ mpg on a run......

[Richie18-1987]

Does the de-cat for the golf tdi 140 also fit the jetta tdi 140 as i wanna purchase one but the right one?

Rich.

[vRSAlex]

Does the de-cat for the golf tdi 140 also fit the jetta tdi 140 as i wanna purchase one but the right one?

Rich.

Yep.

[Andy]

The sound it gives out is  a nice throaty sound but its very quite on the motor way,mpg I got 56

56mpg, at what sort of speed, 55mph?

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doing 70mph

Does the de-cat for the golf tdi 140 also fit the jetta tdi 140 as i wanna purchase one but the right one?

Rich.

thing the tail pipe is longer but the d/p is the same