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TDI (Diesel) Emissions This is a discussion about emissions from TDI's. Pro's cons of Diesels (including biodiesel) effects on the environment and how they compare to Gasoline and other fuel sources for Internal combustion engines.

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Old April 3rd, 2012, 18:42   #1
lazerguy
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Default M-TDI and Emissions Testing

Hi Volks!

Has anyone here passed Emissions testing with an M-TDI?

I'm very interested in converting to M-TDI, but Canada will soon introduce yearly testing, and that's something I need to consider before taking the plunge.

Would a properly tuned M-TDI have better or worse emissions than the stock TDI?

Thanks!
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Old April 3rd, 2012, 19:08   #2
golftdi140
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M-TDI?

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Old April 3rd, 2012, 20:42   #3
GoFaster
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Short form for "mechanical TDI" i.e. a TDI (rotary-pump) engine with the old IDI (mechanically controlled) injector pump, or a hybrid injection pump using a combination of TDI and IDI internal parts so that the electronics are no longer used.

What vehicle are you putting it in, and what engine was that vehicle originally equipped with?

If it is for the vehicle that currently has your '96 IDI engine, that vehicle did not have any electronic engine controls as originally equipped - no OBD-II as originally equipped. Therefore there is nothing to scan and there never was anything to scan. Won't make a difference M-TDI or IDI, same situation. Even if they go to the trouble of checking with VW using the vehicle's VIN, VW will tell them that it originally has no OBD-II.

Emissions-wise, if you get the injection timing in the ballpark and don't go too far overboard with the fuel delivery, it ought to pass any test that an IDI would have been called upon to pass in that same model year.

If you do the job right, the engine will look (almost) the same as the original engine, so no one's the wiser.

If you want to do this to your TDI then the lack of OBD-II on a vehicle that was originally equipped with it could be trouble.
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Old April 4th, 2012, 04:17   #4
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The M-TDI would be my 97 Jetta TDI (ALH engine) with manual 5-spd.
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Old April 4th, 2012, 13:57   #5
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Off hand, I'd say that's going to get you in trouble, because that car had OBD-II as original equipment.
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Old April 4th, 2012, 15:55   #6
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Thanks! That's exactly the kind of info I needed. Then I guess my safest bet will be to invest in a good OBD scanner or vag-com, and replace whatever faulty sensors.
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Old April 9th, 2012, 09:49   #7
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An mtdi will never run as Efficiently and smoke free as an ecu tuned car at the same power level.
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Old April 11th, 2012, 10:26   #8
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Quote:
Originally Posted by oldpoopie View Post
An mtdi will never run as Efficiently and smoke free as an ecu tuned car at the same power level.
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Old April 11th, 2012, 14:33   #9
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Quote:
Originally Posted by westyman View Post
Hey, im not hating on the mtdii, just stating the truth.
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Old April 11th, 2012, 14:39   #10
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The truth require evidence, not heresay. Some mTDIs are certainly not set up well; mine are and run as efficient and clean as my Passat TDI.
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Old April 11th, 2012, 15:01   #11
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Why on Earth would you actually want to step backwards? I can see if the engine was going into something that was not originally a TDI in the first place, but if your '97 Jetta was born a proper TDI, why bother with a good thing? That EDC system is super stupid simple anyways.
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Old April 11th, 2012, 18:42   #12
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Saw a MTDI once and was not impressed. Engine being run by a computer is far better than any mechanical means.
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Old April 11th, 2012, 19:13   #13
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Quote:
Originally Posted by turbocharged798 View Post
Saw a MTDI once and was not impressed. Engine being run by a computer is far better than any mechanical means.
You saw ONE. 'Nuf said. You are clueless as to what else is out there, or perhaps even more importantly - what goes on in ECU-controlled, VE-pump TDIs.

Some of us have far better results than you might imagine. My latest mTDI Syncro Westfalia, for instance, has more power and runs cleaner than my comparable '96 Passat with Alligator chip and PP520's - same engine, same injectors.
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Old April 12th, 2012, 00:13   #14
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And you are running a wastegate turbo that cant perform with the fnesse that the vnt can.m
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Old April 12th, 2012, 09:08   #15
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Quote:
Originally Posted by oldpoopie View Post
And you are running a wastegate turbo that cant perform with the fnesse that the vnt can.m
You shouldn't make assumptions based on knowing nothing about what I build. FYI, the van mentioned is running a VNT1749.

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