I often use the car in Eco Mode and have got quite used to the coasting feature. 

 

On one particular road when coasting downhill if the car speeds up too much the gear cuts back in to slow it down with no input from me. The revs rise from tickover to the engine revs commensurate with the gear the car is in. 

 

Anyone else noticed this feature?

 

tom

36 minutes ago, Sanqhar said:

coasting downhill if the car speeds up too much the gear cuts back in to slow it down with no input from me. The revs rise from tickover to the engine revs commensurate with the gear the car is in. 

What makes you think it's actually using more fuel? Once mine has warmed up, if it's in gear and revving above idle, the fuel is shut off completely when the thottle is closed. If I was to declutch, it would use idle fuel.

3 hours ago, Sanqhar said:

I often use the car in Eco Mode and have got quite used to the coasting feature. 

 

On one particular road when coasting downhill if the car speeds up too much the gear cuts back in to slow it down with no input from me. The revs rise from tickover to the engine revs commensurate with the gear the car is in. 

 

Anyone else noticed this feature?

 

tom

Yes mine does that too (as did my previous Golf SV). And it also restricts your acceleration as an economy measure too. 

 

I've seen arguments that coasting down hills is no more efficient that letting the engine control the speed as when coasting the engine uses fuel to keep it ricking over, while when the engine is controlling the speed it is not injecting any fuel, but have never been able to prove it with consumption measurements either way.

 

Chris

Downhill no throttle no fuel swap over to instant fuel consumption on the read out and you will see it's not using any.

Yes so the real fuel economy gains will be down to restricting the acceleration, using higher gears (for DSGs) and restricting the power consumed by the air-con. Although I do find coasting very smooth and quieter  

 

Chris 

'coasting' function with  a DSG has the gears disengaged so instead of D7 or D6 you see just  D until the gear is engaged again as in the need to decelerate or not increase speed.  

4 hours ago, Sanqhar said:

I often use the car in Eco Mode and have got quite used to the coasting feature. 

 

On one particular road when coasting downhill if the car speeds up too much the gear cuts back in to slow it down with no input from me. The revs rise from tickover to the engine revs commensurate with the gear the car is in. 

 

Anyone else noticed this feature?

 

tom

Nope.

 

I’m not an ECO fan so don’t use it since I played with it on day 1.

 

I find freewheeling very disconcerting. And completely against my early driver training.

 

The theoretical fuel saving is meaningless to me.

 

I want to be driving in a responsive, controllable gear at all times.

 

I flip/flop the lever between D and S as necessary for a satisfactory drive.

I just find eco mode transforms a nice driving car into a slug and tend  to drive it harder to compensate and get poorer economy, for my back roads drive I find sport more economical as the throttle response is sharper also seems to go into 2 cylinder mode more often.as it's easier to feather the throttle.

15 hours ago, KenONeill said:

What makes you think it's actually using more fuel? Once mine has warmed up, if it's in gear and revving above idle, the fuel is shut off completely when the thottle is closed. If I was to declutch, it would use idle fuel.

 

This is not a fuel consumption question. I don't think it's using more fuel, after all the car is on a closed throttle when the revs rise.  Please don't extend the question into a fuel consumption one. This has been well discussed in other threads and opinions differ and I can't see how any further discussion on the merits of different drive modes would achieve anything.  

It is a question regarding the car engaging a gear whilst coasting thus slowing the car down on a closed throttle with no input from the driver. The revs rise because of actions by the gearbox not because the throttle being opened.  I am interested as to whether others have noticed it. Anyone know what the parameters are for it to happen?

 

tom  

 

Edited 10 May, 20215 yr by Sanqhar

Yes i have noticed it. 

Noticed it with a 1.5TSI DSG as you have which is also an engine with ACT.

 

There are differences with different engines and DSG's.

A 1.0 TSI DSG as not got ACT.

Diesels in 1.6, 2.0 or petrol 2.0 TSI's are different or can feel different.

 

'Coasting' function used on some trips can greatly improve economy so the range you get from a tank,

and the only difference from those that feel the need to be in control is you keep your toe off the accelerator.

 

Easy enough if you regularly do the same trips often and in similar conditions or temps to one trip use Coasting Function and one day not.

 

My experience of 'Coasting Function' is positive.  My experience of using 'Eco' modes not so positive.

@Sanqhar @e-Roottoot I was originally treating it as a question of "good driving practice" and was always taught that "coasting in neutral" was "bad driving practice". I was pointing out that, without the so-called "eco mode", you can slow down and/or descend hills more economically by following good practice, and letting the fuel shut-off do its thing. Unless you have a regenerative braking mode on a hybrid or battery electric car, you'll not get more economical than moving forwards using no fuel.

'coasting function' as designed and engineered into the engine and DSG and the ECU,s / engine management is a 'simply clever' system that even non driving enthusiasts can benefit from using and is something rather different from the. Putting cars into out of gear. So simple to just have enabled and when using just a touch of the accelerator or brake had the gears engaged again.