Kingpin angle (like castor angle) contributes to wheel camber change with steering input. With a positive kingpin angle, the outside wheel in a corner will gain positive camber and the inside wheel will loose positive camber.

What is KPI in wheel alignment?

This angle is known as the king pin inclination. The purpose of the KPI is to produce vertical displacement of the vehicle in during steering in an upward direction. The larger the KPI, the larger the effect. This lifting effect produces a self centering torque similar to that of caster.

What is the importance of kingpin inclination?

The kingpin angle has an important effect on steering, making it tend to return to the straight ahead or centre position because the straight ahead position is where the suspended body of the vehicle is at its lowest point.

What is the effect of camber and steering axis inclination are correct?

Steering axis inclination (SAI) causes both front wheels to gain positive camber as they steer away from center. This acts with caster to provide self-centering of the front wheels. This gives the car straight line stability.

How much is king pin inclination?

You want the center of the tire contact patch to be outside of the steering axis point by 1/4 to maybe 1 inch. The closer the points are, the less steering effort is required, but then you also get less feedback or 'feel' in the wheel.

How King Pin Inclination Angle (KPI/KPA) Works

What is KPI and camber?

Camber compliance (the inverse of camber stiffness) is a measure of the compliance of a suspension system when subject to a cornering (lateral) force at the contact patch. It is expressed as the camber change in degrees per kilo Newton of lateral force, Deg/kN.

What is positive camber?

If the top of the wheel is farther out than the bottom (that is, tilted away from the axle), it is called positive camber; if the bottom of the wheel is farther out than the top, it is called negative camber.

Does negative camber affect steering?

A negative camber could potentially lock your steering.

The severe angle that this setup creates can cause the tires to impact the frame of the car when making a sharp corner.

Does camber affect turning?

Static negative camber increases the contact patch on the outside front tire during a turn which increases grip and speed of turning.

What is Castor camber and kingpin inclination?

Caster is the angle of the steering axis from the vertical as viewed from the side and is shown in Fig. Positive caster is defined as the steering axis inclined toward the rear of the vehicle. b. Camber is the angle of the tire/wheel with respect to the vertical as viewed from the front of the vehicle, as shown in Fig.

What is toe in toe out wheel alignment?

Toe in or Toe out ? that is the question.

It is the difference in the distance between the front and rear edges of the rims on one axle. If the distance at the front is larger than the rear, then the alignment is said to be toed-out, and if the distance at the rear is larger than the front, that's toe-in.

How is kingpin inclination determined?

Kingpin angle is measured in Degrees and is positive when the top of the steering axis points towards the centre of the car. Scrub radius is the distance from the steer axis to the centre of the tyre contact patch at ground level and wheel centre offset is the distance from the kingpin axis to the wheel centre.

What is KPI on a car?

Automotive industry uses KPIs or Key performance indicators to track the industry's performance. It helps them make better business decisions and are very important for the success of their industry. KPIs helps industries achieve their goals and helps them gain high operational efficiency.

Is KPI same as Sai?

King pin inclination (also referred to as the steering axis inclination, SAI or KPI) is quite simply the axis about which the wheels steer. Generally, the greater the KPI angle, the more straight line stability the vehicle will have, KPI is also a factor when considering bump steer and scrub radius.

How does steering axis inclination affect steering?

Effect of steering axis inclination :

Kingpin inclination also called steering axis inclination helps the straight-ahead recovery, thus providing directional stability. When the vehicle takes a turn, the inclination of the kingpin causes the vehicle body to move up in relation to the wheels.

What happens if you have too much positive camber?

Excessive positive camber causes scuffing or shoulder wear on the outside of the tire. Too much negative camber creates the same wear patterns on the inside of the tire. Basically, anything that affects the tilt of the tire centerline changes camber.

Is it better to have positive or negative camber?

' Positive camber is for stability, while negative camber is common in high performance vehicles that require better cornering. Quick fact: While some positive or negative camber is good, too much of either is bad.

What's better negative or positive camber?

Positive Camber - When your wheels are tilted outward, the vehicle has improved stability. Negative Camber - High performance vehicles that require better cornering tend to use negative camber, because it gives the driver more control in this regard.

How does negative camber affect toe?

With negative camber, the top of the tires points inwards. Toe is the angle the tires are rotated around their vertical axis, looking at them from above the car. You have no toe if the tires are parallel to each other, along the direction of the car.

What can cause camber problems?

Reasons for camber misalignment:

• Vehicle involved in accident.
• Springs sag causing change in ride height.
• Ball joints or other attached parts are worn or defective.

What is too much negative camber?

Having too much negative camber on your car wheels is a guaranteed way to run through your tyres quickly. The angle creates more contact space with the road, resulting in premature wear and tear of the car tyres. This would be especially applicable when you are taking your car off-road and driving it on rough terrain.

Does camber affect speed?

1) Increased camber angle results in greater straight-line speed because less of the tyre is in contact with the track, and so rolling resistance is less.

Does wheel offset affect camber?

Offset has no effect on the camber of the suspension. The camber angle is the angle measured between the ground and the center line of the axle of the wheel, measured parallel to the for and aft center line of the car.

What happens if you have too much caster?

Vehicles with too much positive caster can be prone to understeer, so most modern vehicles don't have a caster greater than 3 to 5 degrees.