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Variable ratio (VR) steering means that the ratio between the steering wheel and the wheels (tires) is not constant. Depending on the position of the steering wheel the car wheels may be more or less sensitive to steering wheel rotation. Practically, when you drive straight (steering wheels in neutral position) the steering ratio is about 2 times higher compare to steering ration when you are parking (steering wheels is away from neutral position). Variable ratio rack and pinion is used in VR steering. It was originally invented in Australia and later improved in the USA. Variable ratio rack and pinion software is used for calculation of the complex tooth surface of the vr rack.

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Q: What is Variable ratio rack and pinion steering?
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