Setting cruise control to hoon mode

[Silenceisgolden]

My cruise control seems to be set to nanny mode - that is, it is slow to respond to hills, and only slowly gets back up to speed. Presumably this is done for economy reasons.
Is it possible to set the cruise control to hoon mode via the OBD2 port? I don't mind paying for the extra fuel.
Thanks, Paul

[winaje]

Have you tried Sport mode on the transmission?

[Silenceisgolden]

Have you tried Sport mode on the transmission?

Thanks for the suggestion, but yes, I have and it didn't seem to make any difference.

[Rockylizard]

Gday...

:( Interestingly, I don't use Cruise Control when there are hills about but I leave it connected for the odd hill on a drive through 'normal' terrain.

However, I find that if I am set on 100Kph on Cruise and get to a hill, mine maintains the 100Kph for the entirety of the hill - just keeps kicking down gears and revs up to maintain the speed. My D3 hoons :D

I just feel that is exactly what it feels like - hooning. To be on 100Kph back in 4th (maybe 3rd?) gear with 3,500+RPM doesn't feel, or sound like 'good travelling' for a diesel.

It is OK when coming up on a hill and the auto kicks back from 6th to 5th and gives itself a bit of tickle rev-wise and then drops back on the other side. Feels very competent and the only sensation is a slight change in engine rev noise. Usually not even a 'push in the back'. :)

I just hate the sound of a high-reving diesel, I guess. ;)

Cheers - John

[Silenceisgolden]

Gday...

:(
However, I find that if I am set on 100Kph on Cruise and get to a hill, mine maintains the 100Kph for the entirety of the hill - just keeps kicking down gears and revs up to maintain the speed. My D3 hoons :D

Cheers - John

Hi John, that is just what I would like mine to do. Mine is a 2011 D4 2.7 so maybe your year model was different or maybe there is a way to set between "Hoon" and "Nanny". Anyone please? Thanks, Paul

[Disco-tastic]

I would have thought the cruise wouldnt be any worse than the older models.

You could try a gearbox adaptive reset (with a diagnostic tool) and see if as the gearbox relearns it makes a difference. Another suggestion is to keep it in sport for a week and drive it like you stole it - the gearbox will relearn and that may make a difference.

Mine has the annoying habit, on long, minor freeway hills, of dropping to 5th for 10secs til it gets back up to speed, then changing up for 10 til it looses speed, then dropping to 5th and so on and so forth!

Cheers

Dan

[Grentarc]

On my 3.0 D4, I have to press the cruise + button when the hill starts, then press the cruise - just at the top to maintain any set speed, as the cruise seems to allow a +/- 2 km/h difference in speed. Quite frustrating compared the the cruise on my '03 Saab 9-5, as it will react much faster than the D4 to terrain, maintaining a speed up a hill without excessive throttle, and cuts the throttle as soon as speed exceeds the set cruise speed - whereas the D4 seems to keep fuel on down a hill.

[strydes]

I notice a large difference when towing. The cruise will happily drop 5-8km with the van on the back without racing back down through the box, but I think is more sensitive without it on.

I actually really like it. I'm rarely in a rush when towing so happy to speed up/down with the hills.

This is with a 3ltr 8-speed.

[Homestar]

In the old days when a cruise control was a seperate module you could just wind the gain up with a screwdriver on most units. Modern cars have similar setttings, but in the software.

My last company car - a Captiva - had a similar issue - the speed would droop over 10KPH up hills, which Holden fiddled with on its first service and fixed. Not knowing how the LR systems work, I'm not sure if you could do it with a domestic diagnostic tool, but LR themselves may be able to (although they could be unwilling too)

[Ferret]

Is it possible to set the cruise control to hoon mode via the OBD2 port?

The IID tool has some cruise control settings in the BCM ecu which can be changed but I think it relates more to how cruise control setting display on the instrument cluster and what type of cruise control is filled -none, standard or active etc.

There is another setting know as 'JAG Cruise Control' with various options. I don't know what they do but I don't think it relates to changing characteristics like 'dead band' etc. of the currently fitted cruise control which you seem to be interested in.

You could try contacting GAP for further explanation plus they seem to be very response to suggestions re. investigating and adding additional functionality if it is possible.

[BobD]

I like it the way it is too. It drives pretty much the way I would and not foot flat up the hill and flying over the top like some cars do.


I have found when towing that if you really want cruise control to maintain speed up the hills better than the cruise control allows normally just select a lower gear at the bottom of the hill and it will stay closer to the set speed.


The thing I find annoying with my cruise control is that it adds 2 kph to the speed that I set it at. I need to set it at 98 to stay on 100 on the flat.

[Graeme]

Bob, your problem sounds like a CCF mismatch between its various parameters. My D4 didn't have any discrepancy.

[LandyAndy]

My cruise control seems to be set to nanny mode - that is, it is slow to respond to hills, and only slowly gets back up to speed. Presumably this is done for economy reasons.
Is it possible to set the cruise control to hoon mode via the OBD2 port? I don't mind paying for the extra fuel.
Thanks, Paul

I have found cruise drives the car like you do.Drive like a granny like I do,it does.Monkey see monkey do;););););)
Give it a hiding in sport for a few days then see if the cruise matches,I think you will find it does;););););)
Andrew

[Orangi]

I find my cruise control does not hold the speed going down the hill eg 110 kmph not good when there is a radar or camera waiting

[Meken]

Use the paddle to downshift & use the engine braking

[Grentarc]

Use the paddle to downshift & use the engine braking
Can't do that on my D4 as it doesn't cut fuel completely going down a hill - do the newer ones cut fuel? There is a very noticeable difference between going down a hill with cruise "off throttle" and then hitting cancel. Can't use compression to slow down in this case.

[LandyAndy]

Ive found my 8 speed holds speeds reasonably down hill on cruise.Steep hills,I turn the cruise off and use paddles.
I will try leaving the cruise on and paddling down a gear to see if its better.
Andrew

[Orangi]

My others cars had no issue holding the speed going down or up. No need for paddles

[Graeme]

Can't do that on my D4 as it doesn't cut fuel completely going down a hill - do the newer ones cut fuel?It will cut fuel if the set-speed is reduced sufficiently - knock it back 2 or 3 clicks.

[Meken]

My 325 BMW was terrible downhill on cruise - was always getting caught out. Disco is very good for its weight I feel. My definitely retards if you downshift with paddles whilst on cruise

[LandyAndy]

It will cut fuel if the set-speed is reduced sufficiently - knock it back 2 or 3 clicks.
Another trick worth trying.I generaly dont have a problem,mainly going down Bedfordale hill into Armadale which has a 40kmh limit for heavy vehicles and a 80kmh for normal vehicles,cruise set on 80 will creep up to 86 on the steeper parts.They like hiding cameras there as no truckie likes having to do 40kmh.
Andrew

[LandyAndy]

My others cars had no issue holding the speed going down or up. No need for paddles
What are you comparing your D3/D4 too???
These are big heavy vehicles that dont have a huge amount of mechanical resistance so they will pick up speed downhill.
At least they dont hunt the gears going up hill like an asian gearbox on cruise,full revs-upchange,struggle-downchange,full revs again,upchange.............
Andrew

[Grentarc]

It will cut fuel if the set-speed is reduced sufficiently - knock it back 2 or 3 clicks.

I have never tried knocking it back 3 times, as I find it easier to hit cancel once then resume at the bottom as it gives more predictable deceleration.

[LandyAndy]

I have never tried knocking it back 3 times, as I find it easier to hit cancel once then resume at the bottom as it gives more predictable deceleration.

Thats how I use mine,same for sharp bends.But willing to try anything else.
Andrew

[Graeme]

The 3.0 D4 when it was mine would not cut fuel unless at least 6 kph over the set-speed but that's too late. As for going uphill, 1 +click at the base of the hill then another part way up if req'd would maintain 110 kph. There was always plenty of power if needed without dropping a gear, it was just programmed to allow speed to drop 4 kph below before increasing power. Dropping speed a little is fine if you're the only vehicle on the road but when travelling on the freeway amongst others its annoying to keep slowing and I suspect it annoys the following drivers too as most other vehicles with CC appear good at keeping constant speed.

[Graeme]

Set the display to instant fuel consumption then keep dropping set-speed until zero consumption. However I agree its tiresome to keep adjusting, especially as there's a bug that causes set-speed to be set at the current speed if resuming whilst travelling in excess of set-speed then set-speed is immediately increased 1 step, even though set-speed may have been 10 kph below current speed. LR's programming has lots of bugs! .

[LandyAndy]

Mine holds 110 uphill no problem,108 would be the lowest I see.
I can hold 80kmh in 8th going up Bedfordale hill.It takes a bit of paddle play but it gets the idea,YOU WILL DO 80kmh up a steep hill at idle speed;););););)
Andrew

[phl]

Can't say I've seen it slow down to any great degree with my MY13 8 speed SDV6. But I do drive enthusiastically, so the programming may follow my driving style.

Downhill it holds the speed well unless it gets too steep, then I just use the paddles to knock the speed down, going back to D at the bottom.

[Meken]

I've trained mine to down change on the hills

[Silenceisgolden]

Thanks everyone for the replies - seems there is no easy fix. I do wring its neck going up-hill, because as Graeme says, it is a pain for following vehicles when my car slows down. It does not learn the uphill neck-wringing, but it does learn engine braking downhill and that works pretty well.

Looks like I am stuck with this problem, no big deal, but an easy fix would have been nice.

Cheers all.

[SBD4]

Graeme is on the money with the CC behaviour on 6 speed D4's. to maintain speed going up hill increase the cruise speed by up to 6kph and reduce back to preferred speed just before cresting. To help prevent overrun on down hill runs, cancel cruise altogether and just hit the resume at the bottom. It does not matter how you play with the gears on the way up the hill, it will not maintain speed - you will just get a higher revving engine.

My D4 was well and truly trained to be responsive, zero lag and very quick off the mark. As said, it is all in the programming. In my opinion the new D4's are not that much better, I had the use of a MY15 D4 several times for upto 3 weeks at a time and found the behaviour to be the same. Disappointingly, my '16 RRS is similar although not as bad and it will make its way back to the set speed.

[Meken]

I don't have any issues maintaining speed uphill

[LandyAndy]

If you are having uphill issues what is wrong with helping the mojo out with the loud pedal???? They are smart vehicles,but not smart enough to look ahead and see that hill coming;););););)
Sure you get a cruise overide warning,but its more generous than the D2 cuise.The odd time Ive overtaken a truck on cruise it still remains live after the manouver with a blast of help,a D2 gives you a limited overide and would quite often have to re-set the cruise.
Simply help it out then relax the foot;););););).I havent had to do it,Im quite happy with mine.
Andrew

[Grentarc]

If you are having uphill issues what is wrong with helping the mojo out with the loud pedal???? They are smart vehicles,but not smart enough to look ahead and see that hill coming;););););)

I think that the fact is, you shouldn't have to help it. The fact that my MY03 car has a much more refined and all round better cruise control programming than my MY10 vehicle (that had a showroom price of approximately $35,000 more). I am not sure of the technical side of things, but I am guessing the LR cruise doesn't poll the speed as often as the Saab one, which has millisecond reaction time to any change in terrain, and possibly the fact that LR may have programmed the base driving style for economy ie. Let speed drop off by 5km/h before increasing engine load. Still doesn't explain the fact it allows 6-8km/h over speed before cutting fuel - in the other car, as a crest starts to level off, the throttle is backed off so smoothly until over the other side where it closes the throttle completely if you even slightly go over set speed.
I have modified my driving with cruise on the D4 so that I click + at the bottom, click - as I near the top and if the decline is steep, I hit cancel until I feel the need for cruise again. At least the controls are on the steering wheel, where as the other car they are on the indicator stalk, where it would be a real pain if I had to drive the same way.

[LandyAndy]

I dont think the price has anything to do with it,its the weight of the vehicles.Tow a trailer with the SAAB to the same curb weight and compare.We have heavy vehicles.
Perhaps the technology has improved in leaps and bounds with the 8 speed????
I really cant complain about mine.
Andrew

[Grentarc]

I dont think the price has anything to do with it,its the weight of the vehicles.Tow a trailer with the SAAB to the same curb weight and compare.We have heavy vehicles.
Perhaps the technology has improved in leaps and bounds with the 8 speed????
I really cant complain about mine.
Andrew

I doubt the weight has anything to do with it as the LR has bucket loads (about 300nm) more torque and a much better gearbox to boot, with only being 900kg heavier. The fact the car accelerates at the crest where if weight was the issue should mean the Saab would be worse (being lighter).

[LandyAndy]

It must then be a 6 speed issue,I dont have the same issue.It would be interesting if you could test drive an 8 speeder up the same terrain.Waste a salesmans time just for the experiment:cool::cool::cool::cool::cool:
Andrew

[Grentarc]

It must then be a 6 speed issue,I dont have the same issue.It would be interesting if you could test drive an 8 speeder up the same terrain.Waste a salesmans time just for the experiment:cool::cool::cool::cool::cool:
Andrew
I would love to, except I would then probably sell myself on the nearest corner so I could buy one afterwards. :p:p
I would hope that the later models would have a better system, because it is probably my only real disappointment with the vehicle, but then I was warned about the cruise before bought it.

[LRD414]

.... It does not matter how you play with the gears on the way up the hill, it will not maintain speed - you will just get a higher revving engine ..... In my opinion the new D4's are not that much better, I had the use of a MY15 D4 several times for up to 3 weeks at a time and found the behaviour to be the same. Disappointingly, my '16 RRS is similar although not as bad and it will make its way back to the set speed.


I would hope that the later models would have a better system, because it is probably my only real disappointment with the vehicle

I find the 8 speed (MY14) very similar to what Justin and Sean describe, although I have not driven an older one so can't directly compare.
It's more pronounced when towing the camper and perhaps not as bad when cresting as Justin's description. It feels like programming lag rather than an actual struggle.

My previous experience was with Mazda cruise control (car not 4WD) and it was similar to the Saab, more accurate/responsive than the D4, drop gears sooner to maintain speed on uphills, etc.

It doesn't really bother me too much, I will override it as required but it was a surprise and something to get used to. You can leave it and it will return to the set speed but how long it takes depends on the terrain and I find it annoying enough sometimes to intervene.

Scott

[Silenceisgolden]

I have no doubt at all that LR have deliberately set up the cruise control to be mild in order to get best fuel usage. A cruise control is dead simple, especially on a throttle-by-wire system. It is simply up to the programmer to decide how much 'loud pedal' he will allow in response to the cruise control.

My hope was that there was an option of different cruise settings within the existing code, selectable via the OBD2 port, but it seems that is not the case. Presumably in response to grumbles, in the later models they have allowed a bit stronger throttle response to a drop in speed.

[Graeme]

I have no doubt at all that LR have deliberately set up the cruise control to be mild in order to get best fuel usage. In the same vein that the fuel consumption calculation is optimistic, making fuel consumption look better.

[shanegtr]

I have the same issue with my 05 D3. Drops of to much speed when hitting a hill. Even when setting the cruise control I cant just hit the + button and straight away remove my foot from the accelerater - if my foot comes off within about 5 secs of setting the speed then the disco just seems to coast down to about 5km/h slower and then it puts its foot down to get back to the set speed.


My old 99 volvo's factory cruise worked much better, maintained the set speed instantly and as far as its engine power could it maintained speed on hills that would have the disco dropping 5 or more km/h off the speed.


Cant see how its a fuel economy thing as mine seems to drop off the speed slowly (as if its been gentle on the accelerator) and then when it cant do that its all out foot to the floor (so to speak) acceleration to get back to the set speed. I would guess it would be more fuel efficent to maintain the speed with a faster accelerator response to the dropping speed

[phl]

In the same vein that the fuel consumption calculation is optimistic, making fuel consumption look better.

That's quite easily corrected with IID Tools (or similar). Mine is now within 0.2l/100km of accurate after 20,000+km of cross checking against my fuel log.

[LandyAndy]

That's quite easily corrected with IID Tools (or similar). Mine is now within 0.2l/100km of accurate after 20,000+km of cross checking against my fuel log.

My fuel consumption is very close to what the puter says:cool::cool::cool::cool::cool:
Andrew

[winglen]

FWIW, my MY16 over the first 6k is right on the money for consumption. No IID Tool et al adjustment. Wasn't expecting that given other threads. Must have got rid of the optimist factor in the latest release perhaps.

[letherm]

That's quite easily corrected with IID Tools (or similar). Mine is now within 0.2l/100km of accurate after 20,000+km of cross checking against my fuel log.

What did you adjust to change the accuracy?

Martin

[phl]

What did you adjust to change the accuracy?


From memory, you edit the CCF and add (or subtract) the number of l/100km, and I think there was a 2% optimism factor as well.

[apom]

That's quite easily corrected with IID Tools (or similar). Mine is now within 0.2l/100km of accurate after 20,000+km of cross checking against my fuel log.

Mine is miles out... like 20-30% so far. Is this a permanent fix or do you need to leave it hooked up all the time?

[LandyAndy]

Try again,meltdown and back online.
Take a few tankfulls of records and talk to your dealer they should do the adjustment as goodwill or even warranty.They will need the records to know how much to adjust.
Mine has been spot on since new,will be 2 in august.
Andrew

[phl]

Mine is miles out... like 20-30% so far. Is this a permanent fix or do you need to leave it hooked up all the time?

I did it twice to get it right, then it's permanent (or has been for the past 20,000+ km anyway).

[LandyAndy]

Ok.
I did a 600km round trip today in much hillier terrain than my usual trips up to Perth and back,or down to Albany back travelling Albany Hwy.
Im convinced the issue of slowing into hills is a 6 speed issue.I paid close attention to how mine worked,very impressed.For those that know WA,I travelled to Bailingup via Collie,Donnybrook,then back up to Bunbury,up to Collie and back to Williams.
There are lots of big hills on this journey,the biggest drop I saw and only on 3 different hills was a 3kmh loss of speed.In 100kmh zones mostly on the journey,I found it easily drops to 99kmh,the ecu usualy gets it without a downshift and seemed to get to 101 or 102kmh uphill.Now on the steeper hills,at 99kmh if it senses its struggling it gives you 7th,that change is really un-noticable,except for the change in revs on the gauge.7th gets you up pretty steep hills,if anybody knows Roelands Hill going up to Collie,it only used 7th on the first pinch near the lookout bay,8th the rest of the way until the roadworks at the top.Thats a 100kmh speed zone.
On steeper hills where it droped the 3kmh it grabs 7th then almost straight away it grabs 6th.You certainly know when 6th is engaged as it rapidly accalerates back to 102kmh then holds 6th for a short time,then 7th and 8th reasonably quickly.It would be interesting to data log a 6 speed and an 8 speed on similar terrain with a Nanocom or similar.
Downhill.No more riding the brakes for me.Steep declines at 100kmh,leave the cruise on,paddle - once,it selects 6th and holds the speed easily.In 80kmh zones on very steep declines into towns,paddle - once gives you 5th,it holds the speed perfectly.
Most impressed,and it returned a 9.1l/100km indicated for the trip.Remember mine is a TDV6 so the SDV6 should be better.
Andrew

[Graeme]

It is not the 6-speed gearbox that is the cause of the loss of speed, rather that LR changed the logic with the introduction of the 8-speed most likely because the higher gearing of the 8-speed and the availability of 7th that is still higher ratio than the 6-speed's 6th makes the vehicle generally more economical so the extra fuel used to maintain speed on hills doesn't affect the overall economy as much. LR announced that the 8-speed was fitted to the 4.4 TDV8 in the 2011 L322 to reduce fuel consumption and emissions.

[BMKal]

Mine's a six speed and, if anything, I find that it accelerates on hills when the cruise control is on - I'm usually doing a couple of km/hr above the set point by the time I go over the top of the hill. Speed will drop to around 1 km/hr below the set point going down a long hill. Some of the hills between Northam and Perth are a pretty good test for the system. ;)

In general, I find that the cruise control is pretty accurate on mine - usually sits on exactly the set point under most conditions, and any variation from this is only ever 1 or 2 km/hr at the most. Even towing doesn't seem to have any affect on it - though I have never towed anything really heavy with the D4.

The only time that I notice any greater variation from the set point is when I hit "resume" after slowing for a town for example. Vehicle will accelerate to about 3 or 4 km/hr above the set point before settling back to desired speed - but I have had plenty of other vehicles that did this (V8 Dunnydoor wagon was a classic for over-speeding on resumption of cruise control), so I've never seen it as a problem.