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Old 01-23-2021, 01:32 PM   #21 (permalink)
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Originally Posted by hayden55 View Post
If I was you I would do the egr delete kit. Thats the number one killer with those engines. Efficiency will go down a bit but not much. Or since its a VW I assume the carbon cleaning is basically scheduled maintenance on those cars since its so common. :P
The early TDIs were known to suffer from carbon buildup in the intake but much of that happened before low sulphur diesel was available in the US. EGR contributed to carbon buildup so people removed the EGR circuit and replaced it with a straight pipe. This also affects engine heating from cold starts. My buddy did this to his TDI and his biggest complaint is how long it takes to get heat into the cabin.

The EGR cooler helps get some heat into the coolant loop so I did not want to remove mine. I did load a tune that allows EGR when the engine is cold to help the engine warm up more quickly but does not add EGR when the engine is up to temperature. FWIW my car is 16 years old with 110,000 miles and I have not needed to do a carbon cleaning.

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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 01-23-2021, 02:04 PM   #22 (permalink)
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My buddy did this to his TDI and his biggest complaint is how long it takes to get heat into the cabin.
Oooofff! I remember how terrible the heat was in my non-turbo non-tdi 1.6L VW diesel. I could warm up the engine (only took like half an hour) and then go turn on the heater and just watch the needle slowly drop and after a while the heater was blowing cool air. And that was even driving around town with a new high-temp thermostat (that I had changed several times thinking it was the problem). Only cruising along the highway would keep the engine warm enough to warm the inside of the car during the winter.
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Old 01-23-2021, 03:30 PM   #23 (permalink)
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The Dasher experiences thermal runaway. I think it's the sensor at the bottom of the radiator. Water cooling is so complicated.

Maybe I should try turning the heater on.
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Old 01-25-2021, 05:10 PM   #24 (permalink)
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Quote:
Originally Posted by COcyclist View Post
The early TDIs were known to suffer from carbon buildup in the intake but much of that happened before low sulphur diesel was available in the US. EGR contributed to carbon buildup so people removed the EGR circuit and replaced it with a straight pipe. This also affects engine heating from cold starts. My buddy did this to his TDI and his biggest complaint is how long it takes to get heat into the cabin.

The EGR cooler helps get some heat into the coolant loop so I did not want to remove mine. I did load a tune that allows EGR when the engine is cold to help the engine warm up more quickly but does not add EGR when the engine is up to temperature. FWIW my car is 16 years old with 110,000 miles and I have not needed to do a carbon cleaning.
Sounds like yours is a bit different with your tune. Not sure what you mean about low sulfur diesel. Had a friend with an 06 tdi that was clogged up in 2010 at 90k miles and it gave up the ghost. To be fair it was probably the cheater tune they had from the factory. They rolled coal so hard i thought it was a factory option for them to have a big black rear end. :P

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