3.0 D4 CC special feature - go faster with go slower button

[Graeme]

Holding the decrease speed button whilst the vehicle is travelling faster than the set speed will increase the set speed rather than decrease it.

EG set speed 114kph (real speed 109), vehicle gets to 118kph down-hill, hold decrease button and watch cruise setspeed go 116, 118, 120 (I cancel at that point!). Absolutely repeatable.

I don't think LR would have intended this special feature and LR from the programmers up need a good lesson in program/function testing. It really isn't that funny.

[Neil P]

Interesting point.
With the D3 , I don't like the way it gathers speed in c.c mode
when rolling down hill , more so than if the c.c is shut off !
I cancel it , then resume on the flat ....... it's rubbish , as is
the speed maintenance ( or lack thereof ) going up hill.
Lots of quirks in the system so just use the skinny instead.

[gps-au]

Try putting the gearbox into "Sports" mode. (its a bit better - on a D3)

[Graeme]

So the 2.7's CC is as bad as the 3.0's. I was hoping mine's behaviour was new and thus stood a chance of being fixed.

[AnD3rew]

In my D3 the other day with CC on, and hit a bit of a hill just as an overtaking lane started, the hill slowed me down a little and the CC started accelerating the car, just as another car was overtaking me, so I pushed the go slower button a couple times to let him get past but it made me acelerate even more which enraged the person trying to overtake me, and got me into an argument with my missus who wouldn't believe that I wasn't trying to race him.

[DiscoSaffa]

Sorry to throw the cat amongst the pigeons here...... Although I don't get to use the CC on my D3 too often I have just had opportunity to use it on the 750km of Pacific Highway between Sydney and Ballina.

To my mind, it performed really well. The go faster and slower buttons doing their thing as they are supposed to, and on all but the steepest hills, it maintained speed very well.

Perhaps my expectations are not as high as some as it is my first vehicle in 10 years with CC, but to those complaing about speeding up on downhills, and slight slowing on uphills before the change down, bear in mind you are driving three tons of metal, plastic and leather, that has some serious momentum and inertia..... it takes a pretty sophisticated CC system (ie one that operates the brakes) to slow that sort of weight down on steep hills, and without the benefit of eyes, I reckon it does pretty well on the hills......

In situations like over taking (or the one you mention AnD3rew) I reckon it is a far better bet to just hit the brake pedal or plant your right foot and do things manually...... rather than trying to find one of 4 tiny buttons on the steering wheel that don't come as intuitively to hand as the brake or accelerator pedal does to foot.....

Just my two cents worth :)

[CaverD3]

Happy with how CC works on my D3. :)

Interesting to see if the compaint is conistent for all D4s.

[chuck]

The cruise control on mine works brilliantly & my speedo is spot on.

Regards

Chuck

[Jesse B]

Just come back from almost 3000 km trip from Albany to north of Leonora, via a whole swag of different roads - and even including a few long and reasonably steep hills (well, for WA at least). Could not complain about the CC function on my D4. Most I saw it over or under set speed was 3 kph, and that was both over (going down to a river crossing on a highway at set speed 116 kph) and then under (going up the opposite side of same crossing). Didn't try the decrease speed button when over set speed (as per Graeme's original post) so cannot comment on that behaviour.

Checked my speedo with hand-held (and accurate) gps and found it reads a consistent 4 kph above real speed, all the way from 60 kph to 120 kph.

[Graeme]

Perhaps my expectations are not as high as some as it is my first vehicle in 10 years with CC, but to those complaing about speeding up on downhills, and slight slowing on uphills before the change down, bear in mind you are driving three tons of metal, plastic and leather, that has some serious momentum and inertia..... it takes a pretty sophisticated CC system (ie one that operates the brakes) to slow that sort of weight down on steep hills, and without the benefit of eyes, I reckon it does pretty well on the hills......

There's plenty of grunt to accelerate up the steepest of hills so loosing speed is not due to that. Pressing the speed increase button a couple of times does the trick, but then have to decrease at the top.
Overrun does not totally cut throttle, as evidenced by looking at the instantaneous fuel consumption. Cancelling CC slows the vehicle more and instantaneous fuel consumption becomes zero. I consider that LR has implemented a minimum CC throttle, possibly trying to prevent a jerky re-opening of the throttle, at the expense of maintaining the set speed.
My TD5 D2's CC would prevent downhill runaway much better than the D4. Cancelling its CC made no difference so I assume CC cut fuel when too fast.

Its very annoying having to constantly adjust CC to try to maintain a constant speed when travelling in the proximity of other vehicles on freeways. The 3.0's very sensitive throttle and quiet engine makes it quite difficult to maintain anywhere near a set speed in undulating terrain.

[DiscoSaffa]

There's plenty of grunt to accelerate up the steepest of hills so loosing speed is not due to that. Pressing the speed increase button a couple of times does the trick, but then have to decrease at the top.

in a 3.0 TDV6 maybe...... :D

The point I was trying to make is it is easier to just put your foot on the throttle, get over the hill, and take it off again.... speed maintained..... on over run, tap the brake pedal, let is slow and when you get to the bottom of the hill push resume speed maintained...... uphill that is 1 action vs 6 (3 pushes of plus and 3 pushes of minus) on the down hill it is 2 vs 6...... with the D3/D4s we all become so focussed on using driver aids (even on road it would seem) we forget that there is a very simple manual solution.......

I have said this before elsewhere, we all have extremely high expectations of our D3s and even more so of the D4s, that we judge them harshly...... we also tend to compare them to cars..... we forget that these are 3 ton offroaders, not just an SUV, but a seriously competent offroader that perform incredibly on road...... At the end of the day there are areas where it will not be perfect, but remember it is a compromise……..

that makes it 4 cents I guess :)

[AnD3rew]

In situations like over taking (or the one you mention AnD3rew) I reckon it is a far better bet to just hit the brake pedal or plant your right foot and do things manually...... rather than trying to find one of 4 tiny buttons on the steering wheel that don't come as intuitively to hand as the brake or accelerator pedal does to foot.....

Just my two cents worth :)

Thats the second argument I had with the missus:twisted:

Overall I am ok with the CC, I use it all the time, and once you get to know how it behaves you just compensate for it. I have used better ones though.

I do find that it is more of a pain than its worth in very up and down country and I will usually just turn it off if I get to a section like that.

[DiscoSaffa]

Thats the second argument I had with the missus:twisted:

That sounds so very familiar...... Does anyone else find they become a different sort of driver in their D3 or D4 for that matter? :twisted: :burnrubber:

[eddomak]

I don't see what the complaint is really about...

Today I tried out the same instance on my manual Subaru and it works the same - when increasing speed (either downhill or by pressing the accelerator) and holding the "decrease speed / set" button, the current speed at the time is then what cruise control is set to.

Think of the "decrease speed" as also a "set" button and you will understand why the car does this.

If you want to slow the car down, use the foot brake. The decrease speed is really to decrease the cruise speed on a flat road, isn't it?

[Graeme]

The decrease speed is really to decrease the cruise speed on a flat road, isn't it?
No. It is to decrease the nominated cruise setspeed in the same way the increase button increases the nominated setspeed in 2kph increments regardless of the current speed. Try hitting resume for 100 when only doing 60 then immediately hold the increase button and watch the setspeed increase.

[Nomad9]

Hi People,
I don't seem to have the same problems that others have mentioned, I find that my D3 overruns more with the camper trailer on the back, which is a statement you would expect, but normally I don't find the over run any more than my Range Rover P38. The CC works a bit harder and has "given up" on steeper gradients with the camper on the back but apart from that I find it to be OK, no worse than any other vehicle I've driven.
As mentioned earlier the weight / mass and inertia do play a bit part in this equation, I've got a bull bar dual wheel carrier and a LR tank to add in as well.