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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old August 15th, 2019, 07:16   #61
oilhammer
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I think most decent professionals would rather maintain than repair. I know I certainly would. Stuff breaks no matter what, but on vehicles that get regular proper PM it is FAR less frequent, and many things can be done proactively if it gets seen regularly.
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Old August 15th, 2019, 09:04   #62
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When I started PM’s were performed monthly with oil changes at 150 hours. Even if a vehicle didn’t need oil changed it got looked over and greased. It was rare to have a vehicle break down in the field. Then oil got pushed beyond 350, fuel filters often past 1200, break in oil on roots blowers that should have been changed at 100 was going nearly 2000. Mechanics were bored and disgusted and the ones who weren’t lifers in the defined pension system left. Quite depressing change to a job that was once fun and highly sought after. Once I was vested in the pension I no longer had a desire to work there and simply walked off. Nothing to take pride in.
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Old August 30th, 2019, 06:39   #63
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Yep, not ideal use for one. Which, ironically, makes me wonder why you'd be complaining of poor fuel mileage, since you hardly drive anywhere anyway. I mean, heck, you could be driving a V10 Excursion and it wouldn't be a huge deal, LOL.
So, I have decided that I don't care about fuel economy and am now driving more sportingly and more in manual mode. Interestingly, the trip computer shows greater fuel economy now, but I don't believe it -- real computed FE is stillstuck at 25 mpg, and it doesn't seem to matter how I drive. At least now I get to have fun with it.

The question now is: how much fun can I have? But that's a thread for a different forum, and I'll start a new post about that in the appropriate forum.
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Old September 3rd, 2019, 09:22   #64
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So if the cooling fan is running when the car is turned off it's doing a regen?
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Old September 3rd, 2019, 09:27   #65
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exactly! how much for how long.
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Old September 3rd, 2019, 11:06   #66
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So if the cooling fan is running when the car is turned off it's doing a regen?
Not exactly. It could also be running the cooling fans just to get the radiator temp down.
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Old September 3rd, 2019, 11:11   #67
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Not exactly. It could also be running the cooling fans just to get the radiator temp down.
If I'm correctly understanding what my car is doing, the fan speed during regen is very fast, and the fan speed during radiator cooldown is much slower.
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Old September 3rd, 2019, 12:45   #68
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On my 10 and 11 TDIs, I don't think I could tell a difference in fan speed. It was more odor of the burning soot that told me that a regen had been taking place.
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Old September 3rd, 2019, 13:08   #69
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Gotcha - maybe it's just a difference between my 2003 1.8T and my 2013 TDI: the 2003 1.8T often ran a radiator cool-down mode with a fan speed that is much lower than what I hear the TDI do. I don't often hear the TDI fans run after I shut it off, but when I do, the TDI is much, much louder, with obviously faster fan speed.
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Old September 8th, 2019, 07:19   #70
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Mack refuse trucks had constant issues. They never ran down the highway unless one of us mechanics took them out. On and off the throttle and they never properly regened because they would get shut down. Worst part there is the ecu would derate the engine and the operators generally didn't bring them in until it was too late. Once past a certain point a regen could not be forced without dealer specific software.
Point being, a diesel with DPf's need to stretch there legs on a regular basis. Tough on manufactures also as the government mandated a 5yr warranty. Backhoes were especially troublesome also.
Mack's solution.
https://electrek.co/2019/05/08/mack-...garbage-truck/
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Old September 8th, 2019, 11:06   #71
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Interesting, a still garbage truck though, maybe the rats chewing on wires will get zapped with a good dose of amperage
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Old September 9th, 2019, 13:28   #72
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Regen can complete at idle?
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Old September 10th, 2019, 09:05   #73
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Regen can complete at idle?

Yes, it is best to let them complete.
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Old September 10th, 2019, 10:18   #74
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I don't think it will complete. Not enough heat at idle. It'll interrupt. Still, many believe it's a good idea to let the car idle a while if you stop during a regen, to prevent hot oil sitting in the turbo.
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Old September 10th, 2019, 11:52   #75
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It may depend on the circumstances. I'd pull into the parking lot at work and the car would be in full regen. I'd just let it run until everything calmed down before I'd shut it off.
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