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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, 11:56   #46
IndigoBlueWagon
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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, 12:07   #47
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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, 12:17   #48
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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, 13:00   #49
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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, 15:46   #50
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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, 15:59   #51
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Originally Posted by IndigoBlueWagon View Post
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, 16:57   #52
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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, 17:10   #53
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I run both as well. TP and vagdpf. Knowledge is power.
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Old August 14th, 2019, 17:19   #54
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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, 18:02   #55
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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, 01:33   #56
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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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Old August 15th, 2019, 04:23   #57
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Quote:
Originally Posted by jmodge View Post
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.
Don't most of those types of applications just have a manual regen method? I lamp that comes on telling the operator one is required, and then a switch that starts the process? I know John Deere does. They use two modes: Auto and Parked. In either case, the light will flash and then come on steady during. Which is something I think would/could be useful in passenger cars and light duty trucks.

Technically, the DPF light coming on is supposed to tell you a regen NEEDS to occur, as it has failed X many attempts. However a lamp that comes on telling you when the process has started would be helpful, because then you would KNOW and, if at all possible, you could slightly change your current driving to allow it to complete.

But the way Volkswagen (and I assume MB and the rest?) have it, once the light comes on, you've already failed any passive attempts.
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Old August 15th, 2019, 06:40   #58
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Yes they do. However, municipal management priorities are not inline with common sense and can be extremely frustrating. Operators of refuse trucks get pushed hard.GPS systems and tracking systems on cart tippers. The videos provided some entertaining moments for us. Philosophy went from PM maintenance to damage repair.
But yes, the warning system is very good thing to have.
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Old August 15th, 2019, 07:31   #59
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Quote:
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Philosophy went from PM maintenance to damage repair.
....
Boy isn't that the truth?
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Old August 15th, 2019, 08:02   #60
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They ended up with a revolving door on the shop. An open job posting for mechanics. People used to claw at the door to get in there, now they go the other way. Quite sad actually because it was a great job except for about the last two years I was there.
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