Unofficial Tesla Roadster Concept Replaces Rocket Thrusters With Three Mustang V8s

An unofficial Tesla Roadster design from HotCars trades Tesla’s proposed thrusters for three existing Ford Mustang V8 configurations. Built on paper around a Lotus Emira-derived chassis, the exercise presents familiar road-car hardware as a potentially more conventional alternative to Tesla’s delayed second-generation sports car but it is not a Tesla, Ford or Lotus production program.

The contrast is especially sharp because Tesla first showed the second-generation Roadster in November 2017 with a 2020 launch target. The current estimate cited for production is 2028. During that prolonged development period, the proposal has expanded beyond a high-performance electric sports car to include fan and thruster-equipped versions. Tesla’s acceleration figures remain manufacturer claims, and its Roadster information says the Rocket version is not approved for public-road use and no version may fly on public streets.

Three Mustang engines replace three Tesla configurations

The unofficial lineup mirrors the proposed Performance, Thrust and Rocket hierarchy. Its Performance model receives the Mustang Dark Horse’s naturally aspirated 5.0-liter Coyote V8, rated at 500 horsepower. That is the least complex of the three suggested powertrains, although installing it in a mid-engine Lotus structure would still require considerably more than new mounting points.

The Thrust version steps up to a supercharged 5.2-liter Predator V8, rated in the concept at 795 horsepower and 660 pound-feet of torque. The Rocket uses the Mustang GTD’s 815-horsepower supercharged V8, along with dry-sump oiling and a rear-mounted eight-speed transaxle. According to the concept’s specifications, the dry-sump system supports a 7,650-rpm limit, while positioning the transmission at the rear could help distribute mass more evenly across the car.

Those components offer an important advantage for a hypothetical project: they already exist as developed automotive hardware. The engines, oiling system and transaxle are not speculative propulsion devices. That narrows some component-level development work, but it does not turn their combination into a finished or approved vehicle.

The Lotus connection helps and only goes so far

The proposed foundation is the Lotus Emira’s bonded-aluminum chassis. That choice recalls the original 2008 Tesla Roadster, which used Lotus Elise underpinnings, while giving the design a recognizable mid-engine sports-car layout. The body retains the general shape of Tesla’s 2017 prototype but adds a roof scoop, large rear wing, centered exhaust outlet and aggressive diffuser.

Packaging remains the first major boundary. The concept acknowledges that a Ford V8 would not drop directly into an Emira chassis. Engine dimensions, mounting loads, transmission placement and the paths required for intake, exhaust and cooling systems would have to be reconciled with the available structure. The more powerful supercharged versions would intensify those integration demands.

The Hennessey Venom GT shows why the broad idea is physically plausible: that car combined a twin-turbocharged 7.0-liter V8 with a Lotus Exige-based platform. It is a useful precedent for fitting a large engine into a compact Lotus-derived vehicle, not proof that the Emira-based proposal has completed the structural, thermal or dynamic validation required for production.

Existing parts do not certify the completed car

A production version would be assessed as an integrated vehicle rather than as a collection of previously approved components. In the United States, the Environmental Protection Agency requires vehicles and engines to be covered by a certificate of conformity before entering commerce. Certification includes prescribed emissions testing, with additional compliance programs covering production and vehicles already in service.

Using an engine from an existing Mustang therefore would not automatically transfer approval to a different chassis, exhaust installation or vehicle manufacturer. Beyond emissions certification, the completed design would need its structure, braking, handling, controls and occupant-protection systems validated in their new configuration. The concept supplies recognizable starting hardware, not the evidence generated through a complete development program.

That is the useful comparison with Tesla’s proposed Roadster. Mustang and Lotus components could replace some highly unconventional ideas with established mechanical assemblies, but they cannot eliminate vehicle-level engineering. Tesla’s Roadster remains delayed, while the unofficial V8 alternative remains a design exercise whose most difficult work would begin where the parts list ends.

By Thomas Caldwell — AMI’s senior editor for mechanical and mobility engineering, covering vehicle electronics, systems integration, electrification, chassis systems, propulsion, and safety policy.