Hi all

Took my 3.6 tdv8 in the field for the first time today and I’m not sure if the terrain response is working correctly and if there’s anything I can do to rectify this.

So wet grassy field not muddy and on road tyres. My concern isn’t with the fact it struggled it was wet grass and road biased tyres. However I was using grass gravel snow and the center diff never locked once. Tried it on every other mode and the center diff didn’t lock once. Try high revs, low revs, traction control on and off but not once did the padlock turn red. I also have noticed in the past wires going to the rear diff so I’m guessing a locking rear diff but that never locked either.

Now I’m not sure the algorithms used for the car to decide on locking the center and rear diff but I’m sure I heard that rock crawl the diff was automatically locked.

Now I’m not sure if because I had road tyres and it was so slippy all 4 wheels were spinning at the same time so the car didn’t think there’s be any advantage to locked diffs?

I then took my 200tdi defender up the exact same line and even did a hill start on the steepest part to make it really struggle and due to the locking center diff it climbed straight up without a hit of wheel spin.

I rather think you've answered you're own question there with road tyres and wet grass. If they were all spinning at once, the centre diff wouldn't sense any great difference in speeds so wouldn't see any reason to lock the diff. Ditto for the rear diff as well. I suspect your defender has much more aggressive offroad biased tyres on which will obviously make all the difference. Wet grass + road tyres = zero traction and is the worse thing in the world with the wrong tyres.

Were you in low ratio? GGS is not something I used often in my 3.6, but I seem to recall that Mud/Ruts and Rock Crawl only locked the diffs if low ratio was employed. Perhaps it's the same? The older I get, the more I realise that people confuse wrinkles for wisdom

Yes was in low range. Will have to get some all terrains