Thread: D4 Rollover

Originally Posted by blackrangie

Still growing up by the looks

I’ll leave you to your grown up life. I enjoy being a child at heart.

Originally Posted by DiscoJeffster

I’ll leave you to your grown up life. I enjoy being a child at heart.

Dont we all, as i said by my spelling mistake that you pointed out in a grown up way , looks like im still growing up..
As im sure you understand my point was, swearing is usually used when someone can't think of a word to fill a sentence or to offend. My reply was to someone saying that swearing is grown up..In fact its far from it.

Originally Posted by blackrangie

Still growing up by the looks

Ps. I was referring to myself

Originally Posted by blackrangie

Dont we all, as i said by my spelling mistake that you pointed out in a grown up way , looks like im still growing up..
As im sure you understand my point was, swearing is usually used when someone can't think of a word to fill a sentence or to offend. My reply was to someone saying that swearing is grown up..In fact its far from it.

Nah!!!

I just like saying **** a lot

Originally Posted by Tombie

Nah!!!

I just like saying **** a lot

Ha

Thank you SimmAus for you’re first hand account of the incident. I have been a passenger in a highway rollover and also witnessed a multi-rollover with an off-road vehicle.

I fully understand how quickly this occurs and how this could easily happen to any 4x4 driver, regardless of how capable we think we are.

Good to hear you are ok, and a few choice words were only to be expected.

As a D4 owner, my reason for starting this thread was to try and understand, if there is anything I could learn from this incident.

I now realise the D4’s electronics will cut-out the engine, if rolling backwards on a steep incline. Terrifying and probably something you were also unaware of. I am guessing this gives the driver a few milliseconds to apply the brakes before an uncontrollable slide backwards.

Also, I assume the brakes are going to fully lock the wheels without any ‘electronic’ interference, to hold position for an engine restart. Any HDS, ABS or DSC could be a problem, unless intending to descend backwards.

From what you say, a little more gas and a slightly changed line could have made all the difference. But you would not expect such a catastrophic outcome from a minor error.

So a D5 for the future? I know we are all supposed to embrace change, but there’s something intrinsic to a Land Rover in having a chassis. ‘Triggers Broom Paradox’ will be lost on these new models and I don’t see how a glued aluminium monocoque will ever be better than a steel chassis for the longevity of the marque.

However a lower CoG without losing ground clearance makes a lot of sense and may even help to prevent rollovers.

So... I’ve gone out and checked this...
The engine does NOT shut down if rolling back... what has happened is in low range the box can lock up the TC in any gear and if it comes to a sudden stop can stall (just like any auto - take an Auto car out, speed up and anchor the brakes full bore - it can stall).

I’ve also been in a steep climb where sudden loss of traction was found. In that instance we slid back out of control for over 200mtrs, only jamming it into reverse and releasing the brakes and steering like crazy saved it (luck). This wasn’t a new vehicle but an old school D1.

Offsets, ruts, angles, velocity changes all happen in the blink of an eye in these situations and gravity really does suck

Once it’s offline it’s gone, that simple.

As for a Monocoque- Jeeps been doing it successfully for decades without issues.

Technology (construction) has far surpassed a chassis, which was done for convenience rather than outright strength.

Sending my condolences for the loss of your D4 Mark. It may just be a form of transport but, as anyone who's written off any form of pride and joy knows, it's a gut wrenching feeling. Glad your okay though.

I've stalled my 2.7l 2010 twice while off-roading, both times were while climbing steep rocks and the brakes did work afterwards, although the sudden loss of power does jerk the car, and could easily result in slipping on any loose surface downhill. I definitely wasn't rolling backwards when it stalled, I was applying throttle from a standstill with no wheels spinning, which aligns with Tombie's theory. If you had hit that rut and after a few spins the rubber grabbed traction, stopping all 4 wheels spinning and loading up the drivetrain you would have been in the exact same situation.

Classic example of slightly offline and your over here, TJM Vehicle Rollover on Offroad Adventure Show Season 4 Ep7 - YouTube 23seconds is all you need to see.