JLR in 2022 launched a version of its latest Defender equipped with a V-8, but a more hardcore V-8 grade is still in the works for the rugged SUV.

It was confirmed by JLR in March as the Defender Octa, and a new prototype has been spotted testing hard at the Nürburgring. The Octa is set to make a debut later this year, and it's likely to arrive as a 2025 model should it reach the U.S.

All JLR has said about the vehicle is that it will come with a twin-turbocharged V-8 and a version of the automaker's 6D Dynamics suspension. Both features are found in the related Range Rover Sport SV, which generates 626 hp from a BMW-sourced twin-turbocharged 4.4-liter V-8.

The 6D Dynamics suspension is a fancy name for a combination of hydraulic interlinked dampers, height-adjustable air springs, and pitch control. According to JLR, the setup is designed to keep the vehicle's body at an almost level stance during hard cornering or driving over rough terrain. It performed superbly during the recent testing at the 'Ring, as seen in the spy footage.

The prototypes reveal a number of additional details. These include a titanium exhaust with quad tips, along with flared wheel arches, a raised suspension, mud flaps, and BFGoodrich all-terrain tires. The tires are wrapped around 20-inch wheels and measure 275/60 front and rear.

In case you're wondering about the name, it likely refers to certain diamond shapes in geometry known as octahedrons. It's likely JLR wants to convey that the Defender Octa embodies resilience akin to a diamond, the toughest naturally occurring substance on Earth. Teaser photos released alongside last month's confirmation revealed tiny diamond logos on the vehicle.

JLR's Special Vehicle Operations came close to launching a similar hardcore Discovery SVX a few years back. It was going to be powered by a V-8 and fitted with off-road upgrades. It would have established a new off-roading range for SVO, similar to the division's SVR track-focused range and the SVAutobiography ultra-luxury range. While the Discovery SVX was ultimately canceled, JLR never ruled out future vehicles like it.