Thread: What happened to your Discovery 2 today?

Originally Posted by Colmoore

I’ve never looked into tb diffs before this but just googled now - fairly exe at $1600 each!

You looked at lockers? Not much difference.

Originally Posted by Tins

That's a plan, but I wouldn't be locking the front with out already having a rear locker.

BTW, LR's TC system "should" have prevented the wheelspin. Was it disabled? I've never had much confidence in it.

My general thinking is a front locker first, then when the $ tree fruits again, do the rear - front locker will pull the vehicle up, whereas rear locker on its own can send you over corkscrew roll? Plus, rear wheels generally get plenty of weight on them which assists in wheels on the ground/drive.

I’ve only owned the car for a short time, TC seems to work?

Originally Posted by Colmoore

My general thinking is a front locker first, then when the $ tree fruits again, do the rear - front locker will pull the vehicle up, whereas rear locker on its own can send you over corkscrew roll? Plus, rear wheels generally get plenty of weight on them which assists in wheels on the ground/drive.

I’ve only owned the car for a short time, TC seems to work?

Front lockers make the car extremely difficult to steer. I think the consensus is do the rear first if only doing one. LR's TC on the D2 takes some learning to use efficiently, and the brakes/ABS need to be in top shape. My personal choice would be a rear locker, either the ARB type or the Ashcroft. Then the Ashcroft centre diff ATB. Front would be last, if I had to do it one at a time. Have a read of this thread

There are a number of issues in this vid, and it probably isn't representative of Australian tracks, but you can see the TC working. You'll see the TC takes some time to actually work, and the temptation is to floor it, which isn't the best way. You need to give it some, sure, but not full noise. If the CDL is engaged the TC actually does a fairly good job out of the box, but there's a LOT of room for improvement. I'm assuming your car has the CDL?

Thanks Tins, I’ll watch the vid tonight

Yep she’s got CDL and the traction control seems to work pretty much the same as in my Deefers, as all but one of them had ABS.

I hardly ever floor it - that’s usually asking to break something!
But seems wheelspin will still happen with TC, CDL, ABS, it’s just generally not excessive.

With climbs I usually have a go at fairly low speed, then if I don’t make it I’ll try to carry a bit more speed into it and see if momentum or a bump up gets me up. Failing all that I’ll sometimes try and just drive it, letting the tc do it’s thing and steering back and forth to try and get some bite.

Last weekend I had a good spotter and he called ‘stop’ just as the bang went off….

Left foot braking doesn’t seem to make much difference with tc/abs?

Originally Posted by Colmoore

Thanks Tins, I’ll watch the vid tonight

Yep she’s got CDL and the traction control seems to work pretty much the same as in my Deefers, as all but one of them had ABS.

I hardly ever floor it - that’s usually asking to break something!
But seems wheelspin will still happen with TC, CDL, ABS, it’s just generally not excessive.

With climbs I usually have a go at fairly low speed, then if I don’t make it I’ll try to carry a bit more speed into it and see if momentum or a bump up gets me up. Failing all that I’ll sometimes try and just drive it, letting the tc do it’s thing and steering back and forth to try and get some bite.

Last weekend I had a good spotter and he called ‘stop’ just as the bang went off….

Left foot braking doesn’t seem to make much difference with tc/abs?

I think LFB cancels the TC at the time. I use it though, at the same time as the accel. Does much the same thing. Learned that a very long time ago on an Army driving course, in Series IIAs. Hard to do in an old manual, but IIAs are good at breaking axles.

I was speaking with my local indie ( his core business was 4WD mods ) regarding my broken diff. Mine's different to yours, it lunched its pinion bearing, but he was saying that the diffs aren't bad, but they don't like excessive spin bias, but another cause of failure is when the spinning wheel contacts the ground and gets instant traction. The shock load is too much. Reckons the biggest weakness of the Rover diff is crownwheel "flex", which is why he "pegs" them.

Do you know yet what actually broke? The CDL is a point of weakness, especially in a wheelspin situation. Cv, axle etc all can break.

Originally Posted by Colmoore

Thanks Tins, I’ll watch the vid tonight

Yep she’s got CDL and the traction control seems to work pretty much the same as in my Deefers, as all but one of the%m had ABS.

I hardly ever floor it - that’s usually asking to break something!
But seems wheelspin will still happen with TC, CDL, ABS, it’s just generally not excessive.

With climbs I usually have a go at fairly low speed, then if I don’t make it I’ll try to carry a bit more speed into it and see if momentum or a bump up gets me up. Failing all that I’ll sometimes try and just drive it, letting the tc do it’s thing and steering back and forth to try and get some bite.

Last weekend I had a good spotter and he called ‘stop’ just as the bang went off….

Left foot braking doesn’t seem to make much difference with tc/abs?

Left foot braking is essentially what traction control does, the difference being that the traction control works when the speed differential is great enough for the electronics to then intervene, hence the delay.

Left foot braking is instantaneous traction control, no delay.

Can vouch for the ATB which I have front and rear as being highly effective, up the steep shaly climbs of the VHC you can feel it proportioning the drive and there is much reduced wheel spin or loss of traction.

The ATB is constantly proportioning the bias when required, so essentially they are able to minimise the loss of traction by applying more torque to the wheel with traction until the moment arrives where there is none such as lifting, here the left foot braking / traction control comes into play, giving back to the wheel with traction.

Couple of years ago doing the LR 4WD course, the D2 would not 'cross axle' rather it just drove out, there is some level of preload within it which was enough to get moving.

Are they better than twin locking of the diffs, not necessarily in the most extreme of cases, but for what I reckon is 95% of situations, offer more benefit espeacially with steering and side slopes as cases in point let alone working ALL THE TIME, not requiring a switch.

I hope to find out what’s wrong with it tomorrow & will post here.

Interesting that left foot braking, I’ll give it a go once she’s fixed

Well, all I did was wash the car this weekend; with no shed or undercover space to work, weather determined no mechanical work but assisted with washing a very filthy vehicle.
I was at a mates place at Springfield last night and gave the running gear a good water blast at a stretch of road that always floods a foot deep.

To be continued……