Hello,

 

I've noticed that my yeti dsg changes down gear when I'm sometimes driving down a hill.  This causes the engine to rev above the normal change up rpm.  Should I switch off the hill decent switch?  There has to be a way of forcing the 'free wheel' (D) that happens sometimes when I lift my foot off the throttle?  Sorry, if this doesn't make sense, I tried my best.

 

Thanks for the help.

If the grade is speeding up the engine do you really want to freewheel?
How many revs is the engine doing when it changes down?
Are you in drive or sport mode?

 

Edited 22 April, 20197 yr by Urrell

Hi,  Can't say for certain what the rpm is when it changes down.  I'm in drive mode.  Sometimes when I'm drive down a hill in say 6th and lift off the throttle the car goes into 'D', which is free wheeling.  If I touch the brake it goes back into 6th.  Other times if its changed to a lower gear even if I accelerate it won't change up.  Sorry, it's hard to explain.

Sounds to me like engine braking.

 

I agree, but it's almost too much.

Only almost?
Post here what revs the engine gets to when it changes down, pretty sure it's not going to be excessive.

You can turn off the coasting function in the maxidot

Hi, What is the maxidot?

Hill descent switch is for offroad use only should not be used on the road........

Sounds like normal behaviour for a DSG to me (unless it's revving excessively).  What should happen is that on a downward slope, the gearbox will remain in the same gear or change up unless you touch the brake, whereupon the box is programmed to hold gear or even change down to stop vehicle speed rising significantly.

3 hours ago, Charleswj said:

Hi,  Can't say for certain what the rpm is when it changes down.  I'm in drive mode.  Sometimes when I'm drive down a hill in say 6th and lift off the throttle the car goes into 'D', which is free wheeling.  If I touch the brake it goes back into 6th.  Other times if its changed to a lower gear even if I accelerate it won't change up.  Sorry, it's hard to explain.

Put it into manual mode then and change up a gear. You have complete control then.

3 hours ago, Charleswj said:

Hello,

 

I've noticed that my yeti dsg changes down gear when I'm sometimes driving down a hill.  This causes the engine to rev above the normal change up rpm.  Should I switch off the hill decent switch?  There has to be a way of forcing the 'free wheel' (D) that happens sometimes when I lift my foot off the throttle?  Sorry, if this doesn't make sense, I tried my best.

 

Thanks for the help.

 

Err??
Why are you using the HDC? It is part of the OFF ROAD SYSTEM and not for general road use.

 

2 hours ago, Charleswj said:

Hi, What is the maxidot?

The computer display on the dashboard

You aren’t using cruise control when this happens are you?.

I cancel cc going down steeper grades in order to stop the engine braking (which is attempting to maintain a set speed by downshifting).

My CC definitely does not downshift on steep descents (2017 150 DSG 4x4 SEL).  I wish it did, so I wouldn't have to do it manually to stay within the 30mph limit on some of Edinburgh's hillier bits (of which it has a fair few.)  That said, the CC seems to do its job properly once I have selected a suitable gear for it (and it's handy that you can go from auto to manual and select a gear without the CC disengaging).

 

I would be interested to know if other forumites' CC behaves differently.

 

To the OP: using engine braking downhill is a good thing IMO - much better than continuously riding the brake.  The engine will be in overrun so it's not using any noticeable amount of fuel.

 

I have yet to grasp the point of the freewheel setting, so I have it disabled.  (The Maxidot still displays "D" sometimes, so I don't think that indication does mean that it's freewheeling, as such.  But maybe I should check the manual.)

Edited 23 April, 20197 yr by ejstubbs

Thinking about the OP's comments, especially "Should I switch off the hill decent switch", and my conclusion is that he hasn't understood how any of the systems are working.

 

1/ HDC only works if the car is equipped with the Off Road Button and only works if that system is activated. It does not work at any other time.

2/ Downshifting for engine braking is a good thing as it saves wear on the brakes. The slight increase in revs is to be expected and is NOT a problem.
3/ How can the car be in 6th and then move to Drive? That doesn't make sense.

 

And lastly, perhaps the OP could state his location in case there is someone local to him can help.

2 hours ago, ejstubbs said:

I have yet to grasp the point of the freewheel setting, so I have it disabled.  (The Maxidot still displays "D" sometimes, so I don't think that indication does mean that it's freewheeling, as such.  But maybe I should check the manual.)

 

I did look in the manual.  It's not called freewheel, it's called coasting.  It disengages the drive provided you don't touch the throttle or brake.  If you're going downhill sufficiently fast to need to brake then, by my reading of the book, it won't coast.  (I think that might actually answer Graham's third point, though: if you have coasting enabled then lifting off the throttle at any speed will disengage drive.  That's assuming that my reading of the manual is correct.  And, indeed, that the manual itself is correct.)

 

Thinking about it, I believe that my car displays "D" when I'm holding it stationary with the foot brake (IIRC leaving it in Drive with the handbrake on does not disengage the drive - hence it is not recommended.)

 

I agree with Graham's other points.

 

Edited 23 April, 20197 yr by ejstubbs

The 6 speed Wet DSG in 'Coating mode' does show 'D',  but not a gear.  it is 'Coasting'.

The DSG does drop gears on some descents, even in Edinburgh if not in 'coasting mode'. 

Just a case of trial and error to see when, but they will arrest speed.

(reading the owners manual is certainly a good idea.)

 

When Coasting Function is enabled, and you are driving and off the throttle and 'D' shows you are Coasting.

Press the accelerator or touch the brake and the gear you are in will display.

 

As to just being driving downhills, not with 'coasting enabled' & different steepness, speeds, in what ever gear,

there is a sensor that reads the incline / decline.

Edited 23 April, 20197 yr by Skoffski

Surely the Yeti is sufficiently 'intelligent' not to force the engine to rev so much that damage might be caused, isn't it? Personally I like the way that mine handles going downhill on overrun. Some of the hills round here would be downright dangerous to be coasting down.

The coasting mode is cancelled as soon as you touch the brake, a suitable gear is engaged and it will change down to increase engine braking if needed. Personally I prefer my car to slow down if I take my foot off the accelerator so I turned off coasting mode after about the first 1000 mile and have not used it since. 

What I didn't like is all the unnecessary clutch operations, which must increase wear slightly, particularly for those with the dry clutch dsg.

 

I have come down some very steep hills. the engine stays in a high gear until I brake, then it will sometimes change down to increase engine braking, and change down again if the vehicle speed reduces enough to go to the lower gear at acceptable revs. It does not over-rev the engine as it does not exceed revs you would use when accelerating hard. It saves on brake wear, and the engine consumes no fuel at all whilst the engine is braking the car as the wheels are turning the engine, not fuel.

When in 'D' and coasting it will go back in gear and display 'D6' or 'D5' or what ever if you touch the accelerator or brake, and can then go right back to 'Coasting' and display 'D; again.