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Fuels & Lubricants Discussion all about Fuels & Lubricants. synthetic oil, conventional oil, brands, change intervals, diesel grades, gelling and such debated items like that. Non TDI related postings will be moved or removed. This forum is NOT for the discussion of biodiesel and other alternative fuels.

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Old September 24th, 2019, 04:03   #16
oilhammer
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Originally Posted by KLXD View Post
In Kal the CEL can't be on, readiness monitors must be set.
The smoke test is purely subjective on the part of the tester. It's not done on the dyno so there's no load on the engine.

OK, so the OBD test they have is the same we have. We thankfully have no opacity testing.

So really I think this falls back to having a DEtune performed. Whether or not the OP wants to keep it that way I guess depends on how well it runs. But really, mildly modded TDIs do not have to smoke any more than a modern gasoline DI car would to make decent power. I think it is still undetermined at this point what the source of the smoke actually is. Black smoke = too much fuel/not enough air. White-blue smoke = unburned fuel due to a bad combustion event. I also know that the catalysts, while just a simple 1-way type, do reduce smoke quite a bit when they are working correctly.
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Old September 25th, 2019, 16:56   #17
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If it is smoking that bad the tune is not a very good one. Because it is overfueling, more than the engine can get air in. Assuming this is black smoke.
Do they check OBD at all? If not, you can just unplug the MAF and it'll put the engine in a reduced power mode and it shouldn't smoke at all (it will barely have any power either, of course).
The car had a tune before I got it and put a completely different build in it with a larger turbo so I still need to adjust the turbo and check it's vacuum to make sure it's not the culprit and then I do plan to tune it again
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Old September 25th, 2019, 17:02   #18
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OK, so the OBD test they have is the same we have. We thankfully have no opacity testing.
So really I think this falls back to having a DEtune performed. Whether or not the OP wants to keep it that way I guess depends on how well it runs. But really, mildly modded TDIs do not have to smoke any more than a modern gasoline DI car would to make decent power. I think it is still undetermined at this point what the source of the smoke actually is. Black smoke = too much fuel/not enough air. White-blue smoke = unburned fuel due to a bad combustion event. I also know that the catalysts, while just a simple 1-way type, do reduce smoke quite a bit when they are working correctly.
It's a brm so i can't just swap tunes. I do believe it's something else causing the smoke but I'd like to drive it legally while I resolve it and since it won't be under load I don't think it's going to smoke enough to fail me. It's black smoke by the way and mostly at lower rpms so I think I'm under boosting with the bigger turbo I put on it
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Old September 25th, 2019, 17:06   #19
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California already has some of the highest cetane fuel around, so I am not sure that more will help necessarily. Probably the best thing you could do is have a tune just for passing emissions and load that when needed. Then reload your current tune. Why the low compression pistons?
It's a brm so it's not easy to swap tunes. I chose the pistons because I wanted to build a 2.0 that could handle lots of boost and I live in a very warm climate.
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Old September 26th, 2019, 03:40   #20
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I would just find another ECU, have the tuner do that one along with an immo delete, and swap that in there, keep it for the future for this sort of thing.
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