The New Ford Focus RS | Part Four

Ford Focus RS Side

Ford Focus RS Side

Powerful RS heart

At the heart of the all-new Focus RS is a specially developed, turbocharged version of the Duratec 2.5-litre 5-cylinder engine.  Significantly revised for high performance, this powerplant is targeting an impressive power output of 300PS and over 410Nm of torque, contributing to an excellent power-to-weight ratio.

Such significant increases are not simply the result of altering engine management or boost pressure: starting with the Duratec 2.5-litre block, Ford RS engineers developed unique camshafts, a revised cylinder head and gasket and revised intake and exhaust manifold system for the car.

Although the car is still in development, prior to its launch in early 2009, early performance testing indicates a 0-100km/h (0-62mph) time of under six seconds.

A traction ‘Revo’-lution

Throughout Focus RS’ development, Capito and his team have been keeping a sharp focus on creating a car that delivers excellent performance and traction.

Various innovations, developed as a result of customer feedback from previous performance Fords, have allowed engineers to keep the new Focus RS as front-wheel drive, with a limited-slip differential, while still achieving demanding targets for traction, handling and steering.

The new Ford Focus RS is equipped with an innovative front suspension system known as a ‘RevoKnuckle’, which is designed to reduce unwanted steering disturbance and torque steer, the impact of torque on steering in front-wheel driven vehicles.  Torque steer occurs during hard acceleration, cornering or driving on uneven surfaces, when torque on the driven wheels exceeds grips levels.  It is characterised by sudden turning force on the steering wheel and can be exacerbated by vehicles with wide tyres and limited-slip differentials.

In Focus RS, the RevoKnuckle works in conjunction with a Quaife Automatic Torque Biasing limited-slip differential.  Ford Team RS engineers have worked closely with Ford's Advanced Research Centre in Aachen, Germany to develop the RevoKnuckle technology specifically for the high performance Focus RS.  It allows the simplicity of a traditional McPherson strut arrangement, but with geometry settings that minimize steering disturbances and torque steer, principally a reduction in steering offset.

“The Ford Focus is an excellent base for a high performance car – agile, responsive and stable,” explained Capito. “We studied at length how best to enhance these qualities for a high performance model.  Our work has shown clearly that our approach in combining a tuned RevoKnuckle with the Quaife differential is an ideal solution for a high performance front-wheel-drive road car like Focus RS.

“As you would expect, we gave all-wheel-drive careful consideration, but by combining and tuning these elements and learning from Ford’s expertise in industry-leading handling, we have managed to eliminate the weight of AWD from the car and still have been able to target a class-leading balance of traction, handling and performance.

“The result is a lightweight set-up, that will deliver the right blend of traction and razor sharp controllability – in a way no one would have expected from front-wheel-drive, and we believe we have made the right choice,” Capito concluded.

Ford Focus RS | Part Five
Published 5 July 2008 Melanie Carter

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