Thread: All wheel drive vs 4 wheel drive vs ?

Originally Posted by TB

I wish JLR would give us some proper technical insight into what they've built.

Absolutely!

It is fundamental to answering the question I asked in the beginning. Until the engineering department at JLR puts its cards on the table apart from us seeing a vague diagram published on DEFENDER2.com then as they say "the jury is still out"

Originally Posted by Gregz

Could JLR have changed the ratios in the front diff to make the front wheels rotate faster than the rear wheels, and then control the difference using the clutch ?

My guess is absolutely not! The old centre diff isn't "locked" unless driving in a straight line and I expect the LR have done the same with the new arrangement.

This is from the MY21 RRS Press kit( seems slightly similar to the Defer to me, but I note the term "bevel gear centre differential", whatever that is, that might distinguish it from the Defer set-up)
Press kits for the Defer and Disco had even less info. :

Alongside the suite of electronic all-terrain technologies, the Range Rover Sport’s four-wheel-drive capability is managed by a transfer case design. This has a smart actuator in place of a separate motor and ECU, resulting in a 1.5kg weight reduction. It is controlled through a multi-plate clutch. Together with the bevel gear centre differential it provides a 50:50 torque split.
The clutch uses wheel slip information from a range of sensors to distribute torque evenly between all four wheels, while a ‘shift on the move’ system allows drivers to switch between high and low gears at up to 60km/h (37mph). The Active Rear Locking Differential can also be optimised for cornering stability and traction.

A bevel gear differential is the traditional kind. Easy to discover with a quick web search.

I am interested to know where this difference has been listed for the MY22 models. All I can see for engine selection is the same description regardless of the engine model selected which states (Automatic) All Wheel Drive in the online selector and in the downloaded selection information from landrover.com.au

Can someone provide a link which shows the original clarification
thanks

Originally Posted by Graeme

My guess is absolutely not! The old centre diff isn't "locked" unless driving in a straight line and I expect the LR have done the same with the new arrangement.

Agree. They wouldn’t want to be slipping it for extended periods when they want it in the equivalent of “locked”.

Originally Posted by Sweetpea

I am interested to know where this difference has been listed for the MY22 models. All I can see for engine selection is the same description regardless of the engine model selected which states (Automatic) All Wheel Drive in the online selector and in the downloaded selection information from landrover.com.au

Can someone provide a link which shows the original clarification
thanks

"It gets curiouser and curiouser" said Alice (in wonderland).

As the originator of this topic I raised it because when I did a "build you own" it came up as a footnote which I cut and pasted...so I went looking for it to answer your request.

Now it seems not to be the case. A rebuild doesn't declare this.

So what is going on? Is this a storm in a tea cup or JLR hiding something or did I dream it?

The iGuide documentation for 22MY Defender includes a section on "All Wheel Drive (AWD)" that states:

The AWD system automatically varies the status between AWD and Rear Wheel Drive (RWD) to suit the current driving style and prevailing conditions.

RWD is only possible in the new driveline arrangement we've been discussing. So not a figment of your imagination.