2020 Ford Focus RS to have 400bhp, 425lb ft mild hybrid powertrain

The new Focus RS engine’s output of 370bhp is likely to be augmented by a contribution of 25-30bhp – and, more important, around 60-70lb ft of start-up torque – from a 48V integrated starter/generator (ISG).

The system's effortless restarting will save fuel and reduce CO2 by allowing longer engine-off periods, will more efficiently collect regenerated energy from braking and will sharpen the car’s low-speed accelerator response by contributing extra torque from standstill. This will both improve acceleration times and allow the engine to operate more often in its most efficient power bands, a means of reducing emissions, especially NOx.

The total combined power and torque – an estimated 400bhp and 425lb ft – should allow the forthcoming Focus RS to match and possibly beat the new wave of top-end hot hatches from Germany.

It should also enable Ford to cut the Focus RS’s 0-60mph time from today’s 4.6sec to the 4.2sec of the class-leading Mercedes-AMG A45.

Even more important than outright pace in a difficult era for high-performance cars are the impressive cuts in exhaust pollutants offered by the new ISG set-up. It’s unlikely that the new Focus RS will use an electrically driven turbocharger – as recently showcased by Audi – although Ford is known to have been experimenting with these for at least four years. Recent estimates suggest that an ISG-equipped next-generation Focus RS should return cuts of 20-30g/km in its CO2 output, a vital contribution to reducing the fleet average.

All Focus RS editions (including the Mk2 and Mk1, pictured above) so far have had six-speed manual gearboxes, but the fourth-generation version could offer a dual-clutch automatic option. This would take advantage of the ISG’s ability to provide ‘torque pulses’ to smooth gearchanges. The availability of a self-shifter could also strengthen much needed demand for the car in automatic-crazy China and US markets. In the US, especially, the car is seen as costly for its size.

Ford also has multi-speed automatic transmissions available, but they’re unlikely to be used because they’re heavier, bulkier and more difficult to package in a car such as the Focus RS. Even the extra space required to house a shoe-box-sized 48V battery (probably under the rear seat) is likely to have been hard-won: the new Focus sits on a modified version of the outgoing Focus C2 platform with a 50mm-longer wheelbase and a slightly increased 4.4m body length.

As with the current model, the next Focus RS will be a five-door hatchback. Three-door hatches are nowadays seen as unnecessarily costly because they sell poorly in cheaper guises.

Family-oriented versions of the next Focus are tipped to be around 50kg lighter, model for model, but the RS’s extra battery and electric hardware are likely to eat up the difference. Acceleration (and circuit lap times) should nevertheless benefit from the car’s better power-to-weight ratio and especially its quicker low-speed responses.

The new Focus RS’s hardware similarity to its predecessor (above) makes it almost certain that next-generation production will resume at the Saarlouis plant in Germany, where the current car has been made.

The new Focus RS's cabin will follow suit of the regular car with new trim lines that're being redesigned along new Fiesta lines, simplifying the control layout, increase interior space and improve visibility. There has also been special attention paid to quality enhancements across the Focus range. Ford is majoring on further improvements to switchgear and materials, and a better integrated central touchscreen.

Although Ford continues to regard an affordable RS as vital to its everyman self-image, the next generation of the fastest Focus is almost certain to take a price hike to help pay for its more sophisticated electrical hardware. Ford has already taken half a step towards indicating this by pricing its outgoing Heritage Edition at £39,895, around £3000 above the standard RS range-topper. By the time it reaches launch, the 48V car is likely to hit the early £40,000s, at which level it will still undercut German rivals and look decent value given the new-found ‘green’ power and performance.

Ford Focus RS driven at Spa-Francorchamps

UNIQUE ROLE OF THE FOCUS RS:

Until you revisit Focus history, you tend to forget how single-mindedly Ford has used its RS model to stimulate second-half sales in a model’s life. Since the first Focus made its debut 20 years ago, three separate RS models have been offered for only about half the time...

Focus RS Mk1 (2002-2004)

Original two-wheel-drive model well known for its flared wheel arches and its effective but infamous Quaife mechanical limited-slip diff. Didn’t appear until the Focus had been on sale for four years. Fast, with excellent Brembo brakes, but quirky about traction keeping and needed firm handling to give of its best.

Focus RS Mk2 (2009-2011)

Bigger and heavier than the Mk1 so more benign and stable with more sophisticated chassis electronics. Extra poke from an ex-Volvo five-pot 2.5-litre turbo engine and again well respected for sheer speed across the ground. Introduced only after Ford launched its ‘kinetic design’ mid-life models, so once again quite short-lived.