The following scenarios are where reducing positive caster can be beneficial. Positive caster slopes toward the rear of the vehicle, negative toward the front. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. We are so sorry, but the page you requested is not available. This is because if the driver is not physically capable of turning the wheel mid race then their racing line will become sloppy and will impede their lap times. 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.
There are two main ways to measure your caster angle: Turning plates and a digital or bubble camber/caster gauge; Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. You also have the option to opt-out of these cookies.
Again, this is done in 2D from the side view of the car. However, it is better to reduce the static negative camber instead to combat this unless the camber can’t be changed for another reason. Once you have it solidly in place, position your angle finder (parallel to the direction of travel of course) squarely on top and read your caster.
Turn the steering wheel 20 degrees right. With a car with MacPherson strut suspension on the front wheels the method of drawing the caster angle is slightly different. I have truly searched, but the keywords I have used versus the number of hits is tiresome. Your email address will not be published. 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. Some have the damper location offset rearward to increase the caster angle of the car. Hopefully, these articles will help. 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.
An absolutely flat surface is needed for accurate measurement. Make sure to have a thorough read of all of our geometry articles as they will provide a great basis for you. There a few ways that caster can be adjusted on car. Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. 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 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. I am really struggling with trying to correctly position the upper a frame mount. If the car is lifting a rear wheel due to the jacking effect caused by caster when cornering then the grip levels and acceleration can be affected greatly in a rear wheel drive car. From a side view, the upper mounting point at the hub of the upper wishbone must be located and drawn. Setting a positive caster angle in a vehicle without power steering causes a noticeable increase in steering effort. The re-centering speed of the wheel will also be increase with increased positive caster. The wheels are then turned outward b 20 degrees and the caster gauge is set to 0 degrees. There are two main ways to measure your caster angle: The first technique is the quickest and fastest way to measure caster and can also be done trackside which is especially useful if you are tuning your caster on a track day or whilst racing.
Level the gauge and set it to 0 degrees. Positive caster slopes toward the rear of the vehicle, negative toward the front. Coilovers – Installing and Setting Ride Height Correctly, Dallara World Series Single Seater – Under The Skin, Calculating Ideal Spring and Roll Bar Rates Part 2, Calculating Ideal Spring and Roll Bar Rates, How To Calculate Centre of Gravity Position.
Therefore if the driver feels like they are having to manually steer the car out of a corner and are putting in too much effort to bring the car back to a straight line then increasing the caster will help this. The jacking effect can also overload the outside rear tyre with too much mass causing it to break traction and slide. 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.
To measure the caster angle you need : Camber gauge and A pair of turntables (to measure turning 20 degrees in each direction acturately) Tell me if you have these first, to save me typing the whole procedure out for nothing #2 steady eddie, Jul 25, … 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. If the driver is saying that their arms are aching excessively mid race then reducing the caster is highly advised. Uprated Suspension Bushes – What’s the point? One common way to adjust caster is to install an offset caster bush. Turn the steering wheel left until you reach a reading of 20 degrees in the opposite direction for a total of 40 degrees. Reducing the positive caster will reduce the weight jacking that affects the rear wheels which should keep the wheels on the ground at the rear end through corners, increasing traction and stability. Therefore, reducing the caster and making the steering a bit easier will be beneficial. These cookies do not store any personal information.
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. Budget to Premium Coilovers – Whats The Real Difference? We'll assume you're ok with this, but you can opt-out if you wish. Positive caster is often engineered in racing cars since it improves high-speed stability and corning while increasing steering effort. Necessary cookies are absolutely essential for the website to function properly. Notify me of follow-up comments by email.
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Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The front steering forks on a motorcycle are an easy-to-see example of how caster works.
Park the vehicle with the front wheels on the turntables (set to zero).
In the mean time I made some alignment bars and checked toe with tape measure and camber with digital angle meter by placing it on the rotor. This can then be repeated for the other wheel. They point forward at the bottom and slope back at the top, causing the tire to remain stable. With an angle finder, is there a quick location to get a preliminary caster … Turning plates and a digital or bubble camber/caster gauge. Your email address will not be published. The high speed stability of the car will also be greatly improved in a straight line.
Hold the gauge at a 90-degree angle and the reading will be your caster angle for the right wheel. Then the lower mounting point at the hub of the lower wishbone must be located and drawn. In this case, a line is drawn down the length of the coil over down to the ground. Out of these cookies, the cookies that are categorized as necessary are stored on your We also use third-party cookies that help us analyze and understand how you use this website. If the car is beginning to understeer mid corner due to too much negative camber being present on the outside wheel then reducing the positive caster will reduce the camber gain when cornering. Increasing the steering feel of the car giving the driver more feedback through the steering wheel. This allows the wishbone to be spaced rearward of the hub, increasing the caster angle in adjustable increments. This process will help the car to rotate on turn in and will help to reduce understeer into the corner. It can also cause oversteer. Good luck with the conversion.
Hi Peter, thanks for the comment. 3 Reasons Why You Should Not Fit Wheel Spacers To Your Car, Tyre Failure – Graining, Tearing, Blistering and Wearing, Tyre Performance and Grip – A Deeper Look. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. A second line is then drawn vertically down the centre line of the wheel. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). Attach the gauge to the left front wheel hub while the wheels are still set to 20 degrees left. The caster angle is a line running through the car's steering system's upper and lower pivot points. Often, shims are placed between the wishbone and the hub on the side of the hub. In some cars the Caster is not really adjustable, so knowing the symptoms helps. Hold the gauge at a 90-degree angle and the reading will be your caster angle for the left wheel. These are often sold with the main purpose to be camber adjustable. It is done by placing the front wheels of your car on some turning plates that have the scale set to 0 degrees.
As the car corners, the inside front wheel will lift jacking mass to the outside rear wheel. All of these points only need to be drawn in 2D from the side view. Finally the vertical centre line of the wheel must be drawn. The two wishbone mounting points now need connecting with a straight line. In the case of a MacPherson strut system this can be in the form of an adjustable tension rod that holds the lower arm forwards or backwards in the wheel arch.
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