I haven’t seen any technical information, but I got told the basics on the course they give you when you buy the car. I don’t think they would share their specs in any detail anyway. I did find this document:
https://www.landrover.co.uk/explore...nology/technology-guide-terrain-response.html
It covers the basic ethos but to be honest you can feel what’s going on in the 3 modes that I have, plus if you look at the 4x4i screen it will tell you what the centre diff is doing.
My unofficial summary would be:
Sand - high power (lower gearing higher revving), fast throttle, TC dialled back to 20%, centre diff locked. The cross axle slip allows you to maintain momentum even if the car is drifting (I turn of DSC too, but they aren’t allowed) which prevents you from sinking in.
M&R - high torque, slow throttle response, delayed TC (this spin before TC brakes the wheel is to clear mud from your tread and to dig in a little to find a firmer base - opposite to beach driving), this mode feels clumsy at first but when you get used to it you learn to hold your throttle position and allow the wheel to spin then brake and drive the wheel with traction.
G/G/S - ignore gravel (unless you’ve gravelled your driveway with ball bearings) especially if you have AT tyres, this is for slow progress on very low traction surfaces like snow or a wet grassy field. High gearing, low torque, slow throttle, fast TC.
I could be slightly off with this summary so apply your own logic but it largely reflects how you would tackle things in normal 4WD. I know what you mean about needing to understand how it works in order to apply it correctly. Try tackling the same feature in the different modes a few times.
For the kind of stuff you were driving in those videos I would use M&R or probably general driving mode as it wasn’t actually that slippery. For firm/shallow sand I would also just use general. For rocky terrain where you may **** a wheel or 2, I would use M&R or general depending on how uneven the surface is.