Ruf to Run 1,000-HP B8 Prototype at Goodwood in 6 Hillclimb Passes

Q: Which future Ruf models will inherit this groundbreaking 1,000 hp boxer-eight engine?

Ruf has not yet identified the specific future model that will get the new 1,000 hp B8 boxer-eight. What the company has confirmed is that the engine, unveiled publicly at Goodwood in the stretched CTR3-based “Erprober” test mule, is a prototype intended as a technology testbed for a future road-going Ruf. Ruf says it is meant to shape the brand’s next generation of performance cars, but it has not announced a production nameplate, launch timing, or model lineup. That means any claim about a particular car remains speculative. Some outside observers have suggested the B8 could power Ruf’s next hypercar, with guesses ranging to a possible “CTR4,” but Ruf itself has not confirmed that. For now, the only firm answer is that the engine is destined for a future production Ruf model, though exactly which one remains undisclosed.

Q: How did Ruf conquer the historic challenge of a road-legal boxer-eight, an engine even Porsche never produced for the road?

Ruf overcame the boxer-eight problem by treating it as a clean-sheet engineering project rather than trying to stretch Porsche’s flat-six formula. The company designed the new 4.8-liter twin-turbo B8 entirely in-house, paired it with a six-speed manual, and built a dedicated test program around a modified CTR3 prototype. The historic obstacle was packaging. A flat-eight is exceptionally wide, which creates conflicts with chassis structure, suspension mounting points, cooling paths and crash packaging in a road car. Porsche used flat-eights in 1960s racing, but never put one into a production road model, largely because its road-car architecture and engineering base remained centered on the flat-six. Ruf, as an independent manufacturer with its own VINs, chassis programs and carbon structures, had more freedom to redesign the car around the engine. That freedom is visible in the “Erprober” test mule shown at Goodwood. Ruf lengthened the CTR3-based prototype by 100 mm to make room for the B8, using it as a rolling laboratory for future production technology. The engine’s output—more than 1,000 hp and 1,000 Nm—shows Ruf did not merely package the concept, but made it perform at modern hypercar levels. Just as important, Ruf has moved the project into public validation. By firing up the engine at Goodwood and sending Tanner Foust up the hillclimb, the company signaled that the boxer-eight is not a design study but a functioning, road-intended powertrain under active development.

3 articles · Updated · Motor1 · Jul 9

Ruf will publicly demonstrate its B8 Erprober at the Goodwood Festival of Speed, giving the prototype six runs with Tanner Faust driving.
The test car is built to validate technology for Ruf’s next generation of models, centered on a twin-turbo 4.4-liter flat-eight producing more than 1,000 hp and 738 lb-ft.
A six-speed manual is paired with the new engine in a lengthened CTR3-based development vehicle, signaling a more extreme setup than Ruf’s current 800-hp CTR3 Evo.
The debut extends Ruf’s shift from tuning Porsches to building bespoke cars in-house, with future models still expected to draw design inspiration from the 911.