Most cars need 3 to 4 complete turns of the steering wheel to go from lock to lock (from far to far remaining). The steering ratio demonstrates how far to turn the tyre for the wheels to carefully turn a certain amount. A higher ratio means you should turn the tyre more to carefully turn the wheels a particular amount and lower ratios give the steering a quicker response.
Some cars use variable ratio steering. This rack and pinion steering system uses a different number of the teeth per cm (tooth pitch) in the centre than at the ends. The effect is the steering is more sensitive when it’s turned towards lock than when it is close to its central position, making the automobile more maneuverable.
The Rack and Pinion is the assembly in a car that rotates the wheels from side to side when the driver turns the steering wheel. This set up is usually within lighter vehicles and will be replaced by a steering gear package in heavier applications. This is due to the gearbox’s ability to handle the increased stress because of the weight. The rack and pinion includes a primary body which houses the rack piston, a notched rod which moved left and correct when pushed by the power steering liquid. The rack is controlled by the input shaft or steering column which transfers the driver’s input from the tyre the rack assembly. A replacement rack will generally be sold with the inner tie rods and footwear already attached.
A rack and pinion may be blamed for most steering 
issues but many times it is not at fault. When a automobile is hard to carefully turn in one direction or if it is leaking it might be the rack responsible. Often the blame for all around tight steering is put on the rack when most likely the steering pump can be failing. Leaks are also mis-diagnosed often because the rack is usually at underneath of the car any leak will run-down to the rack. Before changing a rack make sure to possess a certified Rack Pinion mechanic inspect the automobile. Knowing the true way to obtain a leak or failure is key to avoid unnecessary auto repairs.
The steering rack & pinion may be the core piece of your vehicle’s steering system. It is an assembly that includes the pinion equipment that connects together with your steering wheel and the shaft that boils down from the steering wheel. It is also a metal tube kind of casing, where there are ends on both sides. These ends are where the inner tie rod ends (individual parts in some cases from the assembly) hook up to, that eventually connect the steering rack and pinion and equipment to the tires and wheels.
A rack and pinion includes a number of parts and seals that allow you to switch the steering wheel at low speeds and when stopped, along with an the help of driving. A steering shaft is definitely attached to the steering column. The steering shaft has a pinion attached which attaches to a linear equipment with teeth called the rack. When the tyre is rotated, the gear on the shaft turns onto the rack and enables it to grasp onto the teeth of the rack, which in turn turns the wheels. Tie Rods, that assist force and pull the wheels when turning, are attached to the Steering Rack at each end. The machine is fluid driven by the energy Steering Pump. The Power Steering Pump forces ruthless onto the Steering Hose, which connects to the Rack and distributes liquid to help with lubrication for the shifting components.
Rack and pinion, mechanical device consisting of a bar of rectangular cross section (the rack), having teeth on one side that mesh with teeth on a little equipment (the pinion). The pinion may have straight the teeth, as in the body, or helical (twisted) the teeth that mesh with tooth on the rack that tend to the pinion-shaft axis.
If the pinion rotates in regards to a fixed axis, the rack will translate; i.e., move on a directly path, as shown by the arrow Abs in the Figure. Some automobiles possess rack-and-pinion drives on their steering mechanisms that operate in this way.