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2015 7P menu options - Coasting option.

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#24 ·
New2Tregs said:
Seriously?? This sounds sooo odd.
I'm going to have to see if my '11 has this option in the menus and if it does try it out.
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This is the standard operation. Has been this way as long as computers have controlled injection pretty much. The coating function does the opposite, when you go to 0% thottle, it decouples the transmission, and allows the engine to go to idle, and provides no engine braking. Your 11 doesn't have it, it started in 15 on the touaregs.
 
#25 ·
In my 2013 the injection goes to zero fuel usage and when in ACC the engine and then car braking controls to the speed set on a downhill. Not sure what it does if not in ACC cruise control but I think it just shuts off fuel and allows the car to coast with torque converter slip as the engine idles I don't think it actually goes to neutral . I will check tomorrow as I come down the West Gate bridge in Melbourne !

cheers
Rohan
 
#27 ·
New2Tregs said:
Wouldn't the engine consume fuel to keep running no matter what? I would think if it didn't it would stall out.
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It's called DFCO; deceleration fuel cut off
 
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#30 · (Edited)
On my 2017 V6TDi I find the coasting function by:

In MFD, once in Vehicle section, scroll to the Consumption since .... screen using the Left/Right steering wheel controller button. Then use the List button located below the four way controller. You will see a list of Consumption since Start, Refuel, Long Term. Scroll down in this list and Coasting will eventually appear and be highlighted. Press the central button in the four way controller. A tick should appear and coasting is active. Must admit it is a baffling place for this function.

In terms of fuel efficiency, there will be a tradeoff between (1) fuel used to idle motor while car rolling along in neutral and (2) the undesired loss of speed from both all the friction required to keep the motor turning over at 1000-2000rpm while foot off throttle and compression engine braking. If you've ever attempted to turn a motor over by hand, it ain't easy. Presumably VW engineers have determined (1) is the lesser use of fuel.

I find it works well if you use good awareness of things like traffic lights coming up being red/about to or upcoming turn onto another road. Lift foot several hundred metres before anticipated stopping or turning point and the car's momentum really does allow for a lot of coasting without slowing so much that traffic behind you will get the irrits up. Without coasting you will be on throttle that little bit longer before moving to braking.

System is quite smart. If touch brakes, gear re-engages to allow engine to assist brakes with decelerating the car. If going downhill, gear re-engages if you pick up more than 2-3kmh over the speed at which you lifted off. So no wild uncontrolled moments in neutral heading down hill.

Does appear to be auto deactivated when cruise control is active (car is always in gear). Not sure why this is. Possibly because cruise control holds set speed with no overrun permitted???

If in the instant fuel consumption screen on the MFD, the screen will show 'Coasting' rather than a consumption figure when the Coasting function has selected neutral. Also gear indicator shows D will no number next to it while coasting regardless of what function you are currently displaying on the MFD.
 
#31 ·
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#33 ·
Southlander said:
On my 2017 V6TDi I find the coasting function by:

In MFD, once in Vehicle section, scroll to the Consumption since .... screen using the Left/Right steering wheel controller button. Then use the List button located below the four way controller. You will see a list of Consumption since Start, Refuel, Long Term. Scroll down in this list and Coasting will eventually appear and be highlighted. Press the central button in the four way controller. A tick should appear and coasting is active. Must admit it is a baffling place for this function.

In terms of fuel efficiency, there will be a tradeoff between (1) fuel used to idle motor while car rolling along in neutral and (2) the undesired loss of speed from both all the friction required to keep the motor turning over at 1000-2000rpm while foot off throttle and compression engine braking. If you've ever attempted to turn a motor over by hand, it ain't easy. Presumably VW engineers have determined (1) is the lesser use of fuel.

I find it works well if you use good awareness of things like traffic lights coming up being red/about to or upcoming turn onto another road. Lift foot several hundred metres before anticipated stopping or turning point and the car's momentum really does allow for a lot of coasting without slowing so much that traffic behind you will get the irrits up. Without coasting you will be on throttle that little bit longer before moving to braking.

System is quite smart. If touch brakes, gear re-engages to allow engine to assist brakes with decelerating the car. If going downhill, gear re-engages if you pick up more than 2-3kmh over the speed at which you lifted off. So no wild uncontrolled moments in neutral heading down hill.

Does appear to be auto deactivated when cruise control is active (car is always in gear). Not sure why this is. Possibly because cruise control holds set speed with no overrun permitted???

If in the instant fuel consumption screen on the MFD, the screen will show 'Coasting' rather than a consumption figure when the Coasting function has selected neutral. Also gear indicator shows D will no number next to it while coasting regardless of what function you are currently displaying on the MFD.
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Have you seen measurable fuel savings using this feature? I tend to hypermile whenever possible, and I'm off throttle when approaching red lights, etc., so I see this as a potential benefit for my driving style. However, if it re-engages gear going downhill with an increase in speed, this may not work. I wonder if this feature can be adjusted in VCDS. I will look into that...
 
#34 ·
OddJobb said:
Have you seen measurable fuel savings using this feature? I tend to hypermile whenever possible, and I'm off throttle when approaching red lights, etc., so I see this as a potential benefit for my driving style. However, if it re-engages gear going downhill with an increase in speed, this may not work. I wonder if this feature can be adjusted in VCDS. I will look into that...
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If you are a hypermiler then you should be using pulse and glide which means you would NOT Be able to use the coasting function.
 
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#35 ·
volkswagens-for-life said:
If you are a hypermiler then you should be using pulse and glide which means you would NOT Be able to use the coasting function.
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Disagree.

Like a manual shift car, dropping it into neutral and rolling down hills gains more MPGs, especially if you live in mountainous/hilly areas, which I do. You cannot pulse and glide uphill.

However, if the coasting feature re-engages as you increase speed downhill, then it may not work, which I will sort out.
 
#37 ·
OddJobb said:
Disagree.

Like a manual shift car, dropping it into neutral and rolling down hills gains more MPGs, especially if you live in mountainous/hilly areas, which I do. You cannot pulse and glide uphill.

However, if the coasting feature re-engages as you increase speed downhill, then it may not work, which I will sort out.
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I'm trying to understand how consuming fuel at an idle rate is going to somehow make you more economical than gliding in gear and consuming zero fuel per dfco. There are countless tests on elgoog which illustrate this time and time again. Consuming zero fuel beats out consuming fuel every time.
 
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#38 ·
If you're also in hypermiling, you wouldn't be using a 5k suv with such a high coefficient of drag....
Are you also running skinnies all the way around?
Do you fold in your mirrors? (or remove them)
Have you removed your roof racks\rails?
 
#39 ·
SaVAGeSoot said:
If you're also in hypermiling, you wouldn't be using a 5k suv with such a high coefficient of drag....
Are you also running skinnies all the way around?
Do you fold in your mirrors? (or remove them)
Have you removed your roof racks\rails?
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I was going to touch on that myself but figured I would ask why he thought to consuming fuel at idle would save fuel vs Not consuming fuel In gear
 
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#40 ·
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