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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 14th, 2019, 05:36   #46
Lightflyer1
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Thanks lightflyer, ur highly knowledgeable!

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Just been reading here for some time. Lots of info here.
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Old August 14th, 2019, 06:57   #47
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So, I've been hearing this about the tdi's regen cycle and short distances
..... is there any magic number of say non-stop driving miles one should drive daily for this not to be an issue..
I see this is a loaded question because of all the variables. I drive daily 2miles back roads, 13 miles highway (65 mph) and half a mile to the parking garage. Followed by the same routine in reverse back home. Is this trip sufficient for the health of the tdi's?

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From my experience, the regens usually start when I pull into the garage or parking space at work. I could have just completed a 400 mile day and it still seems to want to start an active regen just as I'm shutting it down. I know, it's all timing and this would not have been the first one of the day. If I notice it starting at a light or slower traffic, I'll kick the tranny over to manual and keep the rpms higher for a few extra miles.
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Old August 14th, 2019, 07:05   #48
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From my experience, the regens usually start when I pull into the garage or parking space at work. I could have just completed a 400 mile day and it still seems to want to start an active regen just as I'm shutting it down.
So true. And so annoying. If I catch it I'll let the car idle for a few minutes, unless I can't because of time or location. I keep telling myself that VW designed the system to accommodate these driving and stopping conditions and it should be fine, but it still bugs me.

What bugs me more is if it starts a regen at the end of a longer drive, but then when I get in to drive a short distance it tries again, and again, and again.
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Old August 14th, 2019, 07:09   #49
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That is why vagdpf is a good idea. At least you can see where it is at in its cycle and if one is coming due. I have an old android phone that is dedicated for just this one thing. Assuming you can find a version of the cars that works for you. The app owner is across the pond and not all US models are supported, but some still work.
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Old August 14th, 2019, 10:56   #50
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Yes, but...all it really does is confirm you're in regen. You still have to decide whether to ignore it or keep driving 'till it's done. Irritating. That's one of the reasons why I use my older TDIs for local driving.
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Old August 14th, 2019, 11:07   #51
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I'm sure that my 17 Ram EcoD regens at least as much as our VWs, I've only noticed one regen in 28k miles.
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Old August 14th, 2019, 11:17   #52
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I have noticed them on VAG products, but in 11k miles I have never known my Sprinter to be doing one. It either must be more transparent, or the type of driving we do (mostly highway, 75+) is just happens in a very passive manner.
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Old August 14th, 2019, 12:00   #53
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I think it's more transparent on Mercedes and BMWs. I rarely notice it in my 335d.
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Old August 14th, 2019, 14:46   #54
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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.
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Old August 14th, 2019, 14:59   #55
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Yes, but...all it really does is confirm you're in regen. You still have to decide whether to ignore it or keep driving 'till it's done. Irritating. That's one of the reasons why I use my older TDIs for local driving.
No it also tells you where it is at at any given moment as far as how close it is to doing a regen. You can easily tell if it has just regen'd or one is looming really soon or is in progress and about how far along it is. Ash buildup. All usefull info.
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Old August 14th, 2019, 15:57   #56
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Monitoring is about the only way to know for sure. I always reset my trip odometer when a regen completes so I know about when the next one will come and I will start to monitor when it gets close. City driving I will see regens approx 125 miles apart, highway about twice that.

I have a dedicated phone for Vag-Dpf and torque pro, on trips I run the TP and watch egts, coolant and regens. TP shows percent of DPF load to 100% then regen starts, however it does not show it decrease like VAG-DPF does so you don't know how close it is to finishing, so if I am close to my destination I switch to VAG-DPF so I can see the progress. Keeping the RPMs up, or on the highway I can get it to finish in 11 min. trapped in city traffic it will take 20-25 min.

I really wish there was an app to allow management of the regens, to allow you to delay or advance to fit your driving cycle. If you knew one was coming up and you were 15 min from your destination you could advance start it so it could finish just before you arrive, or if one were about to start just as you arrive you could delay it till your next drive cycle. They do seem to initiate at the worst times.
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Old August 14th, 2019, 16:10   #57
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I run both as well. TP and vagdpf. Knowledge is power.
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Old August 14th, 2019, 16:19   #58
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Guess I'm a bit of a luddite about this stuff. I just want to drive the damn car. I don't like the FE readout, either. I prefer not to think about it until I refill. How I'm doing based on gauge position and trip mileage is enough info for me.
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Old August 14th, 2019, 17:02   #59
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Guess I'm a bit of a luddite about this stuff. I just want to drive the damn car. I don't like the FE readout, either. I prefer not to think about it until I refill. How I'm doing based on gauge position and trip mileage is enough info for me.
It's a sort of sickness and you are probably better off without it. Been a gear head all my life, can't stop, I want to know all I can about my rides
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Old August 15th, 2019, 00:33   #60
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Well if you are actually driving the car enough, you need do nothing. If you choose to be informed, even if it is just to satisfy your own curiosity, then that option also exists.
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