Although not the natural habitat for the rugged 4x4 off-roader, this latest spy footage provides a clue as to what powertrain Land Rover will be using for the hot version, which is likely to make its debut next year.
Audio suggests test mules are using the familiar Jaguar Land Rover (JLR) supercharged 5.0-litre 'AJ' powerplant, rather than a turbocharged BMW V8. However, production of the long-serving AJ will come to an end before this year is out, as the Bridgend Ford factory in which it’s made is closed down.
For future high-performance models, JLR is set to use the twin-turbocharged 4.4-litre V8 that BMW produces for its larger M cars, under a wide-reaching powertrain deal struck between the two firms.
This alliance began with the intention to develop electrified powertrains, but sources close to the German manufacturer revealed last year that it has been extended to include supplying JLR with a range of internal combustion engines.
Although the use of the 4.4-litre V8 has yet to be officially confirmed by JLR, Autocar understands that it’s merely a formality. It’s plausible that the 5.0-litre engine is being used primarily to test the Defender’s dynamic responses with the weight and power increases.
Autocar understands the V8 Defender is intended as a low-volume special variant rather than a series-production mainstay. Land Rover may well be stockpiling the Ford-built V8 for use in the Defender, because emissions targets are much less of a priority for low-volume specials.
Interestingly, sources tell us that JLR’s Special Vehicle Operations (SVO) division isn’t directly involved with the Defender V8 project. Instead, it’s an offshoot of the existing Defender engineering operation.
Track testing suggests that extensive chassis retuning is required to ensure the Defender can handle the additional power.
Previous shots showed an undisguised Defender driving on the roads outside Land Rover's research and development facility in Gaydon, Warwickshire, sporting the ‘Prototype Vehicle’ stickers reserved for testing mules. That was the first official sighting of a V8 variant, which had been rumoured for some time and hinted at by bosses.