Introducing the PRECISION STEERING AMPLIFIER
for 2002-2006 R50 MINI Cooper, R53 Cooper S, and 2005-20008 R52 Convertibles.

The PRECISION STEERING AMPLIFIER (p/n NMS6000) improves front suspension geometry for better handling and car control. Works well with stock suspension on and off the track, and more effective on lowered MINIs. The PSA is track-tested following complex computer simulation models.
The PSA is compatible with your 2002-2006 R50 MINI Cooper, R53 Cooper S, and R52 MINI Convertibles. Requires 17" wheels or larger.
The Roll Center Axis of an automobile plays the major role in providing feedback to the driver. An Axis drawn between the Roll Center for the front suspension and the Roll Center for the rear suspension is called the Roll Center Axis. The drivers perception of the direction that the automobile is moving , yaw and roll, is determined by the Roll Center Axis motion. The front and rear Roll Centers are points that the car is actually rotating about, and is determined by the front and rear suspension geometry.
A primary objective in the design of a performance automobile is to have the front and rear Roll Centers maintained close to center of the car (that is, the left to right center) and vertically position above the ground. As an automobile is maneuvered the front and rear Roll Centers move left and right as well as up and down and hence the Roll Center Axis moves accordingly. The feedback to the driver about the motion of the car is based on motion sensing relative to the Roll Center Axis. The Roll Center Axis is the true Axis of roll and yaw.

Computer simulation models were used extensively to study the R53 MINI Cooper S suspension. The Roll Center on the front suspension of MINI Cooper S has large left right position changes when cornering. This is particularly true and evident in MINI’s that have been lowered. The result is poor feedback to the driver and poor handling characteristics.

This Roll Center movement can be significantly reduced by lowering the front ball joints. The PSA was created to correct this problem and to significantly reduce the front Roll Center motion during cornering. The PSA is installed between the ball joint and its mounting surface on the hub carrier. The result is dramatically improved handling characteristics on street and competition MINIs. The improved feedback to the driver is significant. The roll center movement is substantially reduced by lowering the ball joints as has been verified by calculations and computer simulations, and proven on the track.


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