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Cruise control - downhill?
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lewes123
 


Member Since: 10 Jul 2012
Location: South Coast
Posts: 1

United Kingdom 

My BMW brakes when speed is exceeded but its not radar cruise control so will run into the back of slower vehicles, they do two types one radar based and one that will maintain the speed using brakes if needed. I think one is active the other dynamic.

I assume that the Disco must be just either the radar based one or the very basic accelerator only which is a shame as I pock up ,y new Disco tomorrow .

I really like the BMW version without radar in speed limited areas as it will hold 30 or 40 but you are still in control of not crashing, I find the radar ones I've tried a bit odd as they react very late for me.
  
Post #95385412th Jul 2012 5:02 pm
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IanT599
 


Member Since: 24 Jun 2012
Location: Wolverhampton
Posts: 600

United Kingdom 

I've had CC with braking on last 3 cars. Audi A6, BMW 320 and Skoda Superb.

My D3 doesn't have it but my disco is older than my last three cars.

I thought the braking was fine on them. The Skoda had DSG and used the gears to slow as well as the brakes.

Surprised it isn't on a new D4 as standard.
 Ian
No longer a LR owner
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Post #95385512th Jul 2012 5:11 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73121

Ukraine 

Lewes, no radar on D3/4s, at least not from the factory. Thumbs Up
  
Post #95385712th Jul 2012 5:14 pm
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Mother Theresa
 


Member Since: 21 Nov 2011
Location: Northants
Posts: 104

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Ipanema SandDiscovery 4

Though a lot of a palava you can use the hill descent as a down hill cruise control and use the cruise buttons to increase or decrease the speed at which it was set. Good for long descents in the snow earlier in the year where the default speed was just too slow.
  
Post #95685420th Jul 2012 7:35 am
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To_D3_or_not_to_D3
 


Member Since: 23 May 2011
Location: Surrey
Posts: 98

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Java BlackDiscovery 3

Gareth wrote:
Now it may be just a D3 thing, but I am sure my D3 dropped a gear automatically when descending a long hill on cruise control. It was on the A75 heading down towards the coast, it was a pretty steep and very long descent, and I was towing a caravan. I had the CC set to 60 ish.


Agreed, pretty sure mine does this too.
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Post #95685820th Jul 2012 7:45 am
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chavanne
 


Member Since: 11 Jun 2010
Location: Stockholm
Posts: 3

Sweden 2005 Discovery 3 TDV6 SE Auto Galway GreenDiscovery 3

Going downhill in my D4 on German autobahn a couple of days ago at about 120km/h I touched the brakes slightly, and the gearbox shifted down one gear. This was not on cruise control.

I also have the feeling the car did Censored down on cruise control going down hill a few days earlier.
  
Post #9614511st Aug 2012 8:03 pm
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glt.tce
 


Member Since: 13 Sep 2009
Location: Toowoomba
Posts: 2

Australia 2009 Discovery 3 TDV6 SE Auto Santorini BlackDiscovery 3

I currently have a TDV6 D3 which does over-run the speed set in the CC by up to about 8kph before kicking down (in sport setting). I believe that this is because of the auto gearbox. My wife's 2.0TDI Golf with its DSG gearbox is the only vehicle that I have driven which holds its speed downhill in CC to within 1 or 2 kph.
  
Post #96605615th Aug 2012 10:44 am
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747_JK
 


Member Since: 03 Apr 2010
Location: Surrey
Posts: 268

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

I find it a pain my D4 doesn't hold speed on CC downhill. All my BMWs have, even my Ford Edge Crossover in the US on hols last week did. Always considered it a standard function of CC until I owned a Land Rover...
 747_JK
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Post #96947825th Aug 2012 4:29 pm
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kp
 


Member Since: 27 May 2011
Location: Sticking the Ex back in the skanks bin
Posts: 2824

United Kingdom 

Navigator wrote:
Some folk knock it into neutral on the downhill bits and save fuel.


Urban myth that one im afraid Wink
 FFRR Owner, very nearly became a D3 owner Smile
Test piloted a new D4 XS SDV6.. Gone and being forgotten i hope!!
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Post #97118929th Aug 2012 9:31 pm
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Popelka
 


Member Since: 31 May 2008
Location: Praha (Prague)
Posts: 2430

Czech Republic 

dont know about urban myth, but if you can display current consumption you can see straight away whats happening.


On a down hill stretch If I go into neutral the engine is still getting fuel to keep it ticking over (stop it from stalling); but if I just come off the accelerator peddle the fuel flow is 0 and engine braking is in effect and its not speed dependent unless you are at slower than walking pace IE it keeps fuel flow to stop stalling.

so I can save fuel just by coming off the peddle, and still keep the same speed; but depending on the steepness of the hill I slip it down a gear if interested in keep the speed under control (slower cars in front Rolling with laughter )
 Experience is a difficult teacher, because she gives the test first and then the lesson afterwards!!!!  
Post #97130030th Aug 2012 11:24 am
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kp
 


Member Since: 27 May 2011
Location: Sticking the Ex back in the skanks bin
Posts: 2824

United Kingdom 

If you come of the pedal the car is still injecting fuel to maintain an idle speed.

if you leave it in gear all fuel is cut Wink

This can be seen with diagnostic equipment monitoring injector duration Smile

Yes it will show 99mpg or such, but its actually more economical to leave it in gear and use engine braking Smile
And its safer as well Thumbs Up

Fuel flow when not touching an accelerator is never 0 unless the engine is off Wink
 FFRR Owner, very nearly became a D3 owner Smile
Test piloted a new D4 XS SDV6.. Gone and being forgotten i hope!!
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SSRR Destroyer *2 Smile 
 
Post #97130530th Aug 2012 11:43 am
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steveraspberry
 


Member Since: 18 Sep 2011
Location: Nr Sevenoaks,Kent
Posts: 2081

United Kingdom 

M3DPO wrote:
Cc is cancelled on all models when the brakes are used.
Once had a Merc slk 350 that didn't, the cc would not disengage Shocked The harder I pressed the brake the car thought it was going uphill and changed down with more power Shocked I had to turn the engine off which locked the steering Shocked I ended up in a ditch in a field Big Cry apparently it had a fault on the accelerator potentiometer.


Shocked
Wouldn't putting it into neutral then using the brakes ( and steering! ) have been the safer option? Noisy perhaps with the revving but getting the car stopped safely THEN turning it off? Just MHO Confused
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Post #97904619th Sep 2012 9:56 am
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muddywheels4wd
 


Member Since: 16 Dec 2010
Location: East Riding of Yorkshire
Posts: 1681

England 

I had a close call yesterday - Cruise set at 60 on straight road then started going downhill while talking to my son and not watching speedo when I noticed a Police car coming towards me slowing down and looking - glanced at speedo and had crept up to 65 so braked and saw them u turn in rear mirror Sad

He sat behind me for ages - thankfully he couldn't see my bright red neck due to the privacy glass - then he overtook, slowed down and put on blues then shot away into the distance like I was standing still Embarassed

My son passed his test recently and enjoyed every minute of my squirming Rolling Eyes

I have a clean licence and becoming paranoid with all the the 20, 40 and 50's especially on roads I don't know when I cant see any little lamp post reminders and people are on my bumper because they don't care what the limit is and never get caught Evil or Very Mad
 Wanted a Series 2 LR since childhood but previously owned MY16 Disco Sport HSE TD4 Auto, MY13 RR Sport Black Edition TDV6 Auto, MY10 RR Sport HSE TDV6 Auto, 2007 Freelander 1 Freestyle TD4 Soft Top, 2009 Freelander 2 GS TD4 Auto, 2007 Freelander 2 GS TD4, 2004 Disco 2 Metropolis Auto, 2002 Disco 2 GS, 2000 Freelander 1 SE TD4 SW

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Post #97905219th Sep 2012 10:13 am
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amazing
 


Member Since: 05 Mar 2011
Location: chengdu
Posts: 1542

China 2011 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

currently on a road trip and mine too crept up from the set70 to 90 on a long slope. first time its happened.
 It is better to have and not need it then need and not have it.  
Post #97910219th Sep 2012 12:11 pm
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stvmor
 


Member Since: 21 Mar 2008
Location: Hove East Sussex
Posts: 145

Isle Of Man 2007 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Navigator wrote:
Some folk knock it into neutral on the downhill bits and save fuel.

If you take it out of gear the engine uses fuel to tick over. With the car in gear and no throttle the fuel supply is cut off Rolling Eyes
 Stvmor  
Post #97910619th Sep 2012 12:21 pm
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