Sway bar
Sway bar
Control Arm
Stabilizer Link

Sway bar

Why do you need an aftermarket sway bar?

A short explanation of why you need an aftermarket sway bar is that it helps improve your vehicle’s handing and gives you, the driver, more control of the car. For example, if you're taking a right hand turn at high speed, the car begins to lean to the left and put more load on the left side tires, whereas the tires on the right hand side of the car start to lose contact with the road surface. Because of this, they aren't able to work effectively and efficiently in getting the car to rotate through the turn.

What is Anti Roll bar stiffness equation

How does a sway bar work?

Following the law of inertia, an object in motion wants to stay in motion unless acted upon by an outside force. In this case, the outside force to your vehicle is a change direction. As the mass of your vehicle corners, its inertia is causing the car to "roll" to the outside of the turn. This rolling affect causes the car to become unbalanced and "unplanted." The purpose of the sway bar is reduce this action and keep the body of your vehicle level, while maintaining traction and control as the weight is shifted from side to side. The transfer of loads through the sway bar can improve your vehicle’s handling?

Does your Sway bar come with bushings?

With only a few exceptions all sway bar kits come with bushings. Kits that do not have bushings are designed to mount without them.

Is a bigger sway bar diameter better?

Many customers fall into the ‘bigger is better’ trap and shop only for the largest sway bar they can find. Sometimes this works, but many times they are compromising their vehicle’s performance. If other modifications have been made – increased spring rate, lowered height, change in roll center, etc. – the best sway bar may be smaller. The vehicle is a combination of its parts and it doesn’t care how massive and cool the bar may look, it only cares how the sway bar interacts with the rest of its components. This is why our produces adjustable sway bars for many applications. The adjustable sway bar allows you to tune the vehicle to your driving style and suspension components. We also manufacture more than one diameter for popular applications to allow the customer to match the right sway bar to the vehicle.

What is an ideal sway bar setup for oversteer?

A “softer” setup in the front would encourage a good turning ability. The fact that the weight transfer puts a good deal of pressure on the outside tire and rotates around the corner. Meanwhile a “stiffer” setup in the rear will allow more minute losses of traction and a responsive rear end. This also helps rotation around a corner.

Why choose the sway bar from YZS?

We are a professional sway bar supplier of aftermarket and performance in China, with 15 years experience in this line. As a modern enterprise, it has a complete system of R&D, production, sales, service and also has a strong technical and management team. Give us a try and turn your curiosity into an obsession.

How can I calculate the over-steer or under-steer due to the anti-roll bar?

There's this great book called Fundamentals of Vehicle Dynamics by Thomas Gillespie. Chapter 6 of that book deals with cornering. The term he uses to describe cornering of a vehicle is steady state cornering. In the book, the equation for steering angle is given as follows,Steer Angle = 57.3 L/R + K*(lateral acceleration) where: L = wheelbase R = radius of curvature of curve K = understeer gradient (+ve if the car has understeer, -ve if oversteer, 0 if neutral). An anti roll-bar is a part of automotive suspension that is used to reduce vehicle roll by stiffening up the suspension. So basically, it transfers the lateral load generated due to cornering.  Now, understeer gradient is the ratio of load on axle to cornering stiffness, i.e., W/C. When both ratios for front and rear axle are equal, it is termed as neutral steering (K=0). When the ratio of front is greater than the rear, it is termed as understeering (K0). When the ratio of front is less than that of rear, it is termed as oversteering (K). Since, lateral force (a) = W (V^2)/(C g R)where, g = acceleration due to gravity andV= forward velocity,we can predict whether the vehicle is going to understeer or oversteer by calculation and equating W/C ratios for front and rear and make necessary adjustment to the steering angle to compensate for the same.

Where should anti roll bars be used in f1 type cars?

It depends on your kinematic set up and your computed values like for example one of it could be the roll stiffness'.I wouldn't spoon-feed you on this as you've to understand it on your own before following someone else's advice whether to use it or not and where. This would eventually help you in many ways. You'll be in a position to firmly assert your decision in the Design Report, which I feel is the most important part of the competition and you would be totally accountable for the dynamics of your car. It would give huge returns in the testing phase while playing with stiffness and other parameters.I would urge you to read fsae forums and other books like tune to win- Caroll Smith, Race Car Vehicle Dynamics (RCVD)- Milliken and Milliken, technical papers published by Optimum G (Claude Roulle's company). After reading all these things, infact from RCVD itself you would be in a state to conclude where to use in your car (Obviously you will have to brainstorm and take an informed decision considering your driver's skill, engine power, aero/noaero, etc).There are many cases on FSAE forums.And lastly, I would request all of us to not post a cliche question on fsae forums without a proper protocol (name, university name, team name, and proper description of your situation) which you'd find in the answers and questions there. It just spoils the name of Indians and the one starting the thread with the question is abused very badly.You'd think why this is important?Because if you go to an international competition you come to know the situation and how they misconstrue us and we would obviously not want our nation and fellow students to let us down at an international level!

What is the main difference between a torsion bar and a anti-roll bar in vehicles?

Both the Anti Roll Bar and Torsional Bar / Torsion beam work on the same principle - torsion or twisting of a beam to provide an elastic mechanical connection between opposite sides of a suspension.I've differentiated between Anti Roll Bars and Torsion Beam Axles in the following sectionsAnti-Roll Bar ( henceforth referred to as ARB )As the name suggests, an ARB prevents excessive sideways tilting movement (Roll) of the vehicle while taking turns. The anti roll bar is usually a thin and shaped bar that connects two sides of an independent suspension system ( mostly used in the front wheels ) so that when one suspension moves up or down, the movement is PARTIALLY transferred to the other wheel too and thus helps maintain a mechanical connection with flexibility ( due to torsion ).An ARB is also referred to as a Torsion bar sometimes. The ARB is attached by means ofpin joints or ball joints to the suspension linkages on either side and by means of bracket mounted pin-joints to the under body of the vehicle.These linkages are a key difference between Anti Roll Bars and Torsion Beams. Torsion Beams are typically welded to the trailing arms of rear axlesCouple Torsion Beam Axle / Twist Beam Axle (henceforth referred to as CTBA )A CTBA is a much thicker formed metal beam that is welded to a set of  trailing arms. The torsion beam acts as a flexible mechanical link ( similar to the anti roll bar ) with a high torsional stiffness compared to the anti-roll barSince the CTBA is welded at both ends , it allows for a significantly lesser range of relative movement between the two trailing arms. CTBAs are used in rear suspension in tandem with coil spring and damper systems in small cars and other entry level sedans.

How long will it take to replace the front sway bar?

The front sway bar is a little more difficult than the rear sway bar install.But it isn’t very hard at all. The only reason it takes longer is because you have to remove a couple of trays, so it still won’t be a problem. If you are performing this upgrade yourself and you have the proper tools then this job shouldn’t take more than 1-1/2 hours.

Why don't many convertibles have roll bars?

Most modern convertibles have roll bars.They are deployed through the convertible top/bodywork/rear seats in a fraction of a second when sensors in the car detect that the cars pitch has transferred to a dangerous angle.Some cars are offered with optional roll bars (think Mazda MX-5) that are attached to the frame of the vehicle and protrude out of the vehicle. When fitted, these roll bars replace the factory system, which is then either removed or deactivated. The obvious benefit to this addition of aftermarket rollover protection is the reduction in weight of the motors/electronic assembly associated with the OEM units.

Does a car equipped with anti roll bars require a strut bar for its chassis?

No it doesn't.Strut bars are designed to tie the two strut towers together, which can help with torsional rigidity.However, most modern cars are now equipped with (at the very least) front ant-roll bars & few come ready equipped with strut bars.Also, in modern cars, most strut towers are mounted very close to the bulkhead, so in reality a strut bar doesn't make a lot of difference to the handling.   More often than not, they're little more than engine bay decoration.In older cars, where there is a greater distance between the strut towers & the front bulkhead, a strut bar can help, but even then, you'd need to be driving the car quite near the limits of its performance regards grip, cornering etc...

How To Measure a Sway Bar Diameter – 6 Different Ways

6 Ways to Measure a Sway BarWhether you’re replacing your old sway bar bushings, or just trying to determine what size sway bar you want to upgrade to, measuring the diameter of your current sway bar is vitally important. Thankfully, measuring your sway bar can be done easily and in this article we’ll show you 6 methods to do so.If you’re more of a visual learner or just don’t like to read, hit play on the video below. Otherwise, keep scrolling.Locating your Sway BarYour sway bar is a long bar of metal between the wheels stretching between the driver side and passenger side on your vehicle. Typically there is a front sway bar and a rear sway bar, although there are some vehicles that don’t have a rear sway bar. The sway bar is usually attached to the vehicle at each end of the bar and at two places near the center of the bar. End links are used to attach the ends of the sway bar to usually the control arm (the end link point of attachment can vary from vehicle to vehicle). Sway bar bushings are used to attach the middle of the bar to the frame of the vehicle. There are other parts near the sway bar that are rod shaped, like tie rod ends or the axle, but if you can find the rod shaped thing attached to the end link you’ve found the sway bar.Finding the Right Spot to MeasureOnce you have located the sway bar, find the spot where the sway bar bushing mounts to the frame. The point where you take your measurement is critical. You want to measure just next to the sway bar bushing in order to get the most accurate diameter for your bar. DO NOT measure on the bend of the bar, as the diameter can be skewed givinThe Actual Measuring ProcessesThere are six solid methods to measure a sway bar. Most of them can be done with tools you already have around the house. Other tools can be bought. One tool can be printed for free!Method One: the Caliper methodBy far the most preferred and accurate method is to use a digital caliper. At DST we’re particular to this one that you can find on Amazon because it’s capable of showing fractions.g you a measurement larger or smaller than the actual bar size.Method Two: the Free Print-out Tool methodPrintout this free Sway Bar measuring tool that we at DST created. All of the calculations have already been done. Make sure that there is NO SCALING when you print out the tool. Otherwise the measurements will be off. Once you print out the tool, take a pair of scissors and cut out the tool. Wrap the tool around the bar and match the starting line with the size line. The measurement on the right of the line will be your sway bar size. You can printout our free sway bar measuring tool here.Method Three: the Full Set of Wrenches methodGrab a set of wrenches and see which one fits snugly over the sway bar. If the fit is too loose or doesn’t fit all the way over it’s not the right size. If the wrench fits the sway bar perfectly, then take a look at the size of the wrench – that’s your sway bar diameter!Method Four: the Crescent Wrench methodGrab a crescent wrench and tighten it over the bar. Then grab a ruler or tape measure and measure the distance between the jaws. That measurement is the diameter of your sway bar.Method Five: the Tape methodTake a roll of tape, and wrap it all the way around the bar one time. Use a razor blade to cut the tape so that the ends match perfectly and pull the tape off the bar. Use a ruler to measure the tape. DO NOT STOP HERE! This will give you the CIRCUMFERENCE of your bar not the DIAMETER. To get the diameter of your sway bar, take your circumference and divide it by π (that’s pi or 3.14159). The result of this calculation is the diameter of your bar.Method Six: the Sewing Tape methodMaybe you’re just not the kind of guy who has his own tools. If that’s the case, even your Grandma will have the tools necessary to measure a sway bar diameter. If you can raid her sewing closet and come away with a cloth measuring tape, you’ve got what you need. Wrap the cloth measuring tape around the outside of the sway bar to find the circumference of the bar and then, you guessed it, divide by pi.Now that you have the DiameterNow that you have the diameter of your sway bar you can replace the failed bushings with either OE replacements or upgraded polyurethane. Polyurethane sway bar bushings give your sway bar the performance of an even larger bar. You’ll not only get a boost in your handling, but you’ll have the durability of a material that is much better suited to suspension bushings.If you’re having trouble locating replacement sway bar bushings, you can always check to see if any of these universal sway bar bushings will work for you.