V70: Engine Car doesn't decelerate

[FreshAir]

I drove an XF 3.0 diesel a few weeks ago. I was really surprised how much the gearbox was assisting with braking, it was changing down even more than a few DSG's that I have driven before, and a similar age (2010) 5 series I had.

Autos in general have really come along leaps and bounds in control. Starting to get old enough that maybe I would consider one in the future.

[yostumpy]

Originally Posted by FreshAir

Starting to get old enough that maybe I would consider one in the future.

Haha, well I'm just 60, and this is my first ever auto, what a one to start with hay, but i've got to grips with it now. i find i use the throttle? very lightly then feather off to nothing, and it just keeps rolling, then a light touch, and ditto. Also on 50 mph ish A and B roads, I leave it in 5th sport mode, and accelerate when I need to uphill, without it changing up and down the gears all the time,it still rolls down the hills coasting .

[Simmy]

Originally Posted by yostumpy

Ah! this driving style that your daughter has , could be the reason that these cars eat brake pads and discs, because folks drive them in the wrong way. Nowadays, when following other cars, I have noticed, whatever car/gearbox, that peeps don't engine brake anymore. pedal is either stop or go, nothing in between, and people hit the brake now when they think, about anything, as the lights seem to be on and off for no apparent reason, (men and women). Learn to read the road ahead, and you hardly need to touch the brakes at all, even in an XC70.

is called comfort brakeing . and these are the kind of drivers that can only get 30 mpg out of a d5 because they are always on the brake or accelerating

[griston64]

Originally Posted by Simmy

is called comfort brakeing . and these are the kind of drivers that can only get 30 mpg out of a d5 because they are always on the brake or accelerating

Don't even start me on this

I drive behind people who are constantly braking for no apparent reason ? I just don't understand it ! I moan about it so much that my wife now moans at me for constantly going on about it

I started driving at 10 years old ( yes that's right ) on my Uncles farm in Kent. I was then taught on the roads by my father. Ease off the throttle before the corner, change down ( never brake in the corner ) and accelerate out. F**k knows what they teach people these days as they are braking all over the place ! They must go through brake pads and tyres at a ridiculous rate !

I start counselling next week

[apersson850]

Originally Posted by yostumpy

... I leave it in 5th sport mode, and accelerate when I need to uphill, without it changing up and down the gears all the time, it still rolls down the hills coasting.

There's only one sport mode, but I get that you mean manual selection of 5th gear.
Anyway, when left in D the gearbox will shift up and down as needed to make sure you have the torque you need when needed, and then run on a gear as high as possible when the load is light and the speed is right.
That's usually more economical than selecting a gear that sometimes is unnecessary low.
Since a correctly maintained gearbox shifts gears almost unnoticeably, there's not much penalty for having the optimal gear most of the time. It's different if you are towing something heavy.

[ferg55]

Originally Posted by apersson850

There's only one sport mode, but I get that you mean manual selection of 5th gear.
Anyway, when left in D the gearbox will shift up and down as needed to make sure you have the torque you need when needed, and then run on a gear as high as possible when the load is light and the speed is right.
That's usually more economical than selecting a gear that sometimes is unnecessary low.
Since a correctly maintained gearbox shifts gears almost unnoticeably, there's not much penalty for having the optimal gear most of the time. It's different if you are towing something heavy.

I find my gearbox (D5 Geartronic without Sport Mode) doesn't change down quickly enough (6-5, 5-4...), for example when going uphill slowly behind a lorry, or even just driving on B-roads. So it labours in too high a gear, below the RPM where the turbo spools up and so there is no torque. If I manually change down, it is then in the correct gear with plenty of torque. Is this just me?

[apersson850]

If you are behind the lorry, going slowly, you don't need any lower gear to keep up. If you intend to overtake, then yes. In these cases I tend to slip over to sports mode, as my XC70 does have that. Still automatic, but quicker response and tends to run one gear lower than D mode, up to about 100 km/h.

[Tatsfield]

I think that AW must have felt that since you have manual selection when in Sports Mode, that was enough to allow sporty drivers gearbox control. My ZF boxes tended to make assumptions that there were times when the box would shift down to provide braking and it was even more easy to force the box to shift down by selecting Sports mode. I've had this conversation about the inability of my AW box to make down shift decisions unless I actually select the lower gear myself. I suppose the XC70 just isn't a sporty car. It is powerful but it's not as easy to control the transmission as a true sports car.

[yostumpy]

Originally Posted by apersson850

If you are behind the lorry, going slowly, you don't need any lower gear to keep up. If you intend to overtake, then yes. In these cases I tend to slip over to sports mode, as my XC70 does have that. Still automatic, but quicker response and tends to run one gear lower than D mode, up to about 100 km/h.

OK, confused no. My 2016 D5 has the manual option, so when I flick the lever over, it drops a gear, and an S +/- comes up on the dash.

a) Is there a 'sport' mode as welll as 'manual' , or

b) are they the same thing.

If a) then please explain, as I feel I may be missing something in my driving pleasure.

[apersson850]

It's not just AW. Today's automatic gearboxes can be parametrized to behave differently. Just like you have Drive and Sport, you as a car manufacturer can make the gearboxes do their work in different ways, depending on what kind of car you put them in. Aisin-Warner defines the parameter set, then Volvo set it up for their need.