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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 September 12th, 2019, 20:18   #76
Lightflyer1
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I would think it quits regen but takes some time to cool down just sitting there. The real test is to see if it starts back up again soon after interrupting it like that. Like with VCDS or VagDpf.
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Old September 12th, 2019, 20:32   #77
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I have shut down during a regen and restarted right away, the regen continued where it left off. Once I shut down just as it started and went inside for the night. Next day the regen started over as soon as operating temp was reached. I have been able to get my regens down to 12 minutes in town. I keep the rpms between 1,500 and 2,000, if I hit a red light I pop it into neutral and hold the brake and nudge the accelerator with my right foot (I have size 16D feet) to keep it at 1,500. The soot load continues to tick down just as if I were moving. 12 minutes she finishes and a couple more minutes for the EGTs to cool down to normal. All verified with VAG-DPF.
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Old September 13th, 2019, 06:08   #78
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The question is though will it complete just sitting in a parking lot at idle? I think not.
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Old September 13th, 2019, 06:29   #79
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Does the software allow a forced regen like trucks do, raising the idle and monitoring egt’s and pressure differential?
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Old September 13th, 2019, 06:48   #80
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Does the software allow a forced regen like trucks do, raising the idle and monitoring egt’s and pressure differential?
Yes, a standing regen can be initiated by VAG capable diagnostic software. OBDeleven will do it.
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Old September 13th, 2019, 06:49   #81
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The question is though will it complete just sitting in a parking lot at idle? I think not.
Shall I be the guinea pig?
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Old September 13th, 2019, 08:03   #82
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The software in the car does not allow you to initiate a forced regen on demand. If you have the factory tool or VCDS or similar then yes you can do it. Not something you would want to carry around and hook up and do in the parking lot though. It would be easier and faster to just keep driving for 10 minutes or less.
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Old September 14th, 2019, 08:52   #83
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Default Regeneration DOES finish at idle!

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The question is though will it complete just sitting in a parking lot at idle? I think not.
Regenerations most definitely continue at idle on my 2012 TDI Sportwagen. It's easy to observe if you monitor the exhaust gas temperatures.
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Old September 14th, 2019, 10:38   #84
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Regenerations most definitely continue at idle on my 2012 TDI Sportwagen. It's easy to observe if you monitor the exhaust gas temperatures.
Probably injects diesel fuel upstream of the dot. Unless you inject def. trucks would do the same, ecu watches egt’s and controls injection
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Old September 14th, 2019, 19:24   #85
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Probably injects diesel fuel upstream of the dot. Unless you inject def. trucks would do the same, ecu watches egt’s and controls injection
The TDI does late fuel injections in the cylinder; this is all known and has been discussed here.
An advantage of idle regenerations is that the turbo temperature is lower, at least from what I am seeing.
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