This bush mounts the back or front of the lower wishbone to the car and has the centre bolt hole offset in a forward direction. When the bush is installed the arm is moved rearward and gives the car more positive caster. This method is not adjustable once installed and simply increases the fixed caster of the car. Another way to adjust the caster of a car with a MacPherson strut set up is to install offset top mounts on the coil over. These are often sold with the main purpose to be camber adjustable.
Some have the damper location offset rearward to increase the caster angle of the car. Once again this position is fixed as is not adjustable once installed. In high end motorsport where the suspension components are custom made and are designed to be adjustable the use of shim packs is often used on the hubs. Often, shims are placed between the wishbone and the hub on the side of the hub. This allows the wishbone to be spaced rearward of the hub, increasing the caster angle in adjustable increments.
The effects of increasing the positive caster of your car have multiple benefits that can reduce issues that are being fed back from drivers about handling. The improvements that can be made are:. Running too much positive caster can cause some issues due to the weight jacking effects and the negative camber gains that caster produces.
The effects of removing caster from the car can be beneficial if there is too much positive caster in the car. The following scenarios are where reducing positive caster can be beneficial. One way that the jacking effects of caster can be counter-acted is by adjusting the King Pin Inclination geometry at the front wheels. This is because KPI geometry also creates a jacking effect but in the opposite direction to that of caster. Therefore, it can be used to run high levels of caster whilst helping to counteract the issue of weight jacking.
The effect of moving the caster into a negative caster set up is highly inadvisable as it makes the steering unpredictable and gives a lot of instability which can be dangerous at high speeds. Great stuff, very useful! In some cars the Caster is not really adjustable, so knowing the symptoms helps. Hi Peter, thanks for the comment.
Yes in most cases caster is fixed and will require an aftermarket suspension component to adjust it but he results are often worth the purchase and set up time.
I am trying to upgrade the suspension in my Pontiac kingpin front end to a ball joint suspension from a Pontiac. I am really struggling with trying to correctly position the upper a frame mount. Hopefully, these articles will help. Hi Jonathan, Thanks for the comment. Good luck with the conversion. Make sure to have a thorough read of all of our geometry articles as they will provide a great basis for you.
I am curently replacing the original upper and lower control arms on a Camaro with Tubular Control arms which allow some caster adjustment by the positiong of upper control arm bolt bushings. Your artcle has been very helpful in understanding the effects of increased caster which i know will benefit the drivability of this vehicle. Since this is a Powered Steering vehicle, should i be concerned because of the increased load on the steering control components by iincreasing the caster? Hi Francisco, thanks for the comment.
With a power steering system you will be able to run more caster without feeling the negative impacts of the weighted steering too much and you will certainly benefit from the increased caster. For caster you would need to adjust the tension rod in the correct direction and then re-measure the caster each time using turn plates and a caster guage.
Thanks very much for this description! Skip to content. The self-aligning torque and straight-line stability that is characteristic of positive caster are absent in a negative caster setting. Caster settings are not a primary, direct factor in tire wear. However, excessive positive caster in association with other alignment maladjustments can exacerbate a tire wear issue. For example, a tire wear pattern called feathering can result from a combination of too much caster with incorrect toe settings.
Tire feathering is characterized by a high-low, smooth-sharp variation in the wear pattern of the tread blocks. Of all of the alignment settings, however, caster is the least likely to be a cause of uneven or abnormal tire wear. Arthur Krebs and his positive caster concept! By continuing to use our site, you consent to the placement of cookies on your browser. Learn more. Installation options:. Get FREE delivery, too. Shop now. Winter tires Winter wheels All about winter tires Get ready for winter The forecast calls for colder weather, with slick and icy streets.
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Home Learning center Tires Understanding the importance of the caster. How Does Caster Affect Driving? So what is there to know about caster, and how does it affect driving?
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