Loss of power in rock mode.

[Spence]

Just wondering why whenever I tackle a very steep Hill, in rock mode, I experience a huge loss of power. Sometimes to the point where I could put the pedal to the ground, and it won’t move at all. Anyone else experienced such a thing? Can’t find any other threads here, with the same issue. Cheers.

[101RRS]

Do you have DSC turned off?

[Graeme]

How's the gearbox oil level?

[Spence]

Do you have DSC turned off?
Yes,I always turn it off. Not sure if that’s the right thing to do or not. Just habit from when I had a Jeep. In new to the D4.

[Spence]

How's the gearbox oil level?
This vehicle is fairly new to me. It is going in next week for a full service. I shall have that checked. Will this make a big difference? Should it lose power like that if low on oil?

[loanrangie]

You realise that the throttle response is reduced in rock crawl mode ?

[Disco-tastic]

I had the same thing when tackling a steep muddy hill. I put it in rock crawl as i thought the quicker it locked the centre diff and stopped wheels spinning the better. What i found was that the computer would cut throttle if it sensed spinning wheels and sudden changes in any direction, such as jostling from either from ruts or bumps.

I figured it was programmed to think, in that situation, that control had been lost and cutting power was the safest option. That or the higher speed was freaking it out (i wasnt exactly crawling).

I never got a chance to try the same hill in mud ruts or sand mode though i am assuming they would have performed better as they allow more wheel slip and jostling before stepping in.

And yes, even with the DSC off the DSC can still intervene.

If you get a chance try the same hill in mud ruts or normal. Sand mode will give you very sudden throttle response so i wouldnt recommend it first thing.

And let us know how it goes!

Cheers

Dan

[Spence]

You realise that the throttle response is reduced in rock crawl mode ?
Yes, I realise it is reduced in rock mode. But in this case it wasn’t reduced, it was pretty much zero. No forward motion at all. I was going slow and controlled but the power just got less and less until there was nothing.

[Spence]

I had the same thing when tackling a steep muddy hill. I put it in rock crawl as i thought the quicker it locked the centre diff and stopped wheels spinning the better. What i found was that the computer would cut throttle if it sensed spinning wheels and sudden changes in any direction, such as jostling from either from ruts or bumps.

I figured it was programmed to think, in that situation, that control had been lost and cutting power was the safest option. That or the higher speed was freaking it out (i wasnt exactly crawling).

I never got a chance to try the same hill in mud ruts or sand mode though i am assuming they would have performed better as they allow more wheel slip and jostling before stepping in.

And yes, even with the DSC off the DSC can still intervene.

If you get a chance try the same hill in mud ruts or normal. Sand mode will give you very sudden throttle response so i wouldnt recommend it first thing.

And let us know how it goes!

Cheers

Dan
I go to this area quite often. As soon as weÂ’re allowed out, I will tackle it again and experiment with different modes, and have a bit of play around.

[TuffRR]

It is likely DSC kicking in, which does happen in various modes. Some more aggressive than others. From memory mud/ruts is the least aggressive as it expects a certain amount of wheel slip.
I think also it sometimes has a self preservation mode kick in. A few times i have been bound up on a rock ledge or in mud and no matter how much i want power, computer says no. I put this down to some smarts which is protecting components.

[Tombie]

Rock crawl isn’t the correct setting for this type of terrain [emoji41]

Try Mud N Ruts [emoji38]

[Spence]

It is likely DSC kicking in, which does happen in various modes. Some more aggressive than others. From memory mud/ruts is the least aggressive as it expects a certain amount of wheel slip.
I think also it sometimes has a self preservation mode kick in. A few times i have been bound up on a rock ledge or in mud and no matter how much i want power, computer says no. I put this down to some smarts which is protecting components.
Yep, makes sense. But not much good to us when we’re traversing rocky terrain and the computers don’t give us the power to do so. I’ve come from a highly modified Jeep Wrangler, really hard to get my head around it. Obviously I’m not expecting it to be as good of road… But I expected more I guess.

[TuffRR]

Yep, makes sense. But not much good to us when we’re traversing rocky terrain and the computers don’t give us the power to do so. I’ve come from a highly modified Jeep Wrangler, really hard to get my head around it. Obviously I’m not expecting it to be as good of road… But I expected more I guess.

It's possibly as good... Just needs different driving styles. They are very capable, but it takes time to work out how to get the best out of them.

[PerthDisco]

This may help


Rock Crawl
https://r.tapatalk.com/shareLink/topic'share_fid=669&share_tid=281881&share_pid=3039560&url=https%3A%2F%2Fwww%2Eaulro%2Ecom%2Fafvb%2Fshowp ost%2Ephp%3Fp%3D3039560&share_type=t&link_source=app

[101RRS]

This may help


Rock Crawl
https://r.tapatalk.com/shareLink/topic'share_fid=669&share_tid=281881&share_pid=3039560&url=https%3A%2F%2Fwww%2Eaulro%2Ecom%2Fafvb%2Fshowp ost%2Ephp%3Fp%3D3039560&share_type=t&link_source=app

That just takes you to the AULRO home page.

[PerthDisco]

That just takes you to the AULRO home page.

It may be a Tapatalk app thing if your not using it to view Aulro on your phone but take a look at my post in the seperate thread on Rock Crawl

[akovach]

What gear are you trying to do the hill in?

[Spence]

What gear are you trying to do the hill in?
I have tried it in first and second. Just to be clear, does everyone turn DSC off in Rock mode? What about mud/ruts? On or off? Learning alot here.

[Spence]

Rock crawl isn’t the correct setting for this type of terrain [emoji41]

Try Mud N Ruts [emoji38]
Yep, I’m going to give this a try this weekend. I shall report back on Sunday.

[Disco-tastic]

I have tried it in first and second. Just to be clear, does everyone turn DSC off in Rock mode? What about mud/ruts? On or off? Learning alot here.Ive tried both. I leave it on for slow rocky stuff but have tried turning it off to climb a sandy ledge. Didnt make a difference - as soon as the wheels were slipping it would cut power.

[DiscoJeffster]

Ive tried both. I leave it on for slow rocky stuff but have tried turning it off to climb a sandy ledge. Didnt make a difference - as soon as the wheels were slipping it would cut power.

Makes sense because dynamic stability control is about loss of control of the vehicle at speed (yaw) whereas traction control is about limiting wheel slip and is how Land Rover control cross axle slippage in open diffs. DSC at low speed should do very little. On the beach though, where you have ruts etc that cause the vehicle to randomly yaw when going in a straight line, this can be seen by the vehicle as an uncontrolled movement that may be leading to a complete loss of control - hence DSC tries brake the respective wheels to stop the yawing motion. In sand this is bad news and slows the vehicle, bogging it.

I’m the same. DSC off for sand, it’s on for everything else with no ill effect.

[101RRS]

For me - DSC off for everthing offroad - it stays off unless you overdo it in the power area or throw the car around too much. DSC kicking in in muddy tracks can throw the car sideways in the opposite direction the initial yaw direction was with possible dangerous ramifications.

[scarry]

Makes sense because dynamic stability control is about loss of control of the vehicle at speed (yaw) whereas traction control is about limiting wheel slip and is how Land Rover control cross axle slippage in open diffs. DSC at low speed should do very little. On the beach though, where you have ruts etc that cause the vehicle to randomly yaw when going in a straight line, this can be seen by the vehicle as an uncontrolled movement that may be leading to a complete loss of control - hence DSC tries brake the respective wheels to stop the yawing motion. In sand this is bad news and slows the vehicle, bogging it.

I’m the same. DSC off for sand, it’s on for everything else with no ill effect.

DSC will also limit power,particularly at speed in soft sand, the driver can have the loud pedal pushed to the floor, and revs disappear.
All forward motion will stop suddenly.

[PhilipA]

A Toyota Fortuna does the sama thing on sand according to a mate who went on the beach with me for the first time.
He commented that when he hit dry sand humps he lost power.

I asked him whether he had disabled DSC or whatever Toyota calls it and he looked at me blankly. He then tried with it disabled and bingo.

So it’s not only Land Rover.
Even my 19 MY Jazz has it for Gods sake.

March of the lawyers and bureaucrats.

regards PhilipA

[Tombie]

Had similar in the work LV last week.
I have a 20km+ stretch of dirt to access my site. We’ve had quite a bit of rain and it was well awash last week.

Having driven it thousands of times I was motoring along and on a slight left found some very slippery sections.

Front goes left, rear goes right....

Tried to power drive out of it and the Toyota has decided to cut all power - zip, zero, zilch.... not fun when throttle would have solved the problem and the vehicle says no!

[Spence]

Had a bit of a play this weekend, at the same hill I was having problems with previously. Tried it again in rock mode, DSC on. Got exactly the same results. Tried mud and ruts mode, DSC off, much better. It was still cutting power a little, but not too bad. I will endeavour to do more testing.

[BobD]

Had a bit of a play this weekend, at the same hill I was having problems with previously. Tried it again in rock mode, DSC on. Got exactly the same results. Tried mud and ruts mode, DSC off, much better. It was still cutting power a little, but not too bad. I will endeavour to do more testing.

I hope you are in low range. I didn't see any reference to that in your replies.

[Spence]

I hope you are in low range. I didn't see any reference to that in your replies.
Yes, low range.