Control arm bolts are measured from the ground up to the center of the bolts. As you drag the mouse or the scroll bar, the car moves up and down in response. This program was written for guys designing off road or rock climbing systems but the design math is the same. For you guys that really want to work out the laws of physics in rear suspension systems, here is a neat little calculator i ran across a while back. Antisquat in a linked suspension system determines how the rear end of a vehicle. A popular choice for both front and rear suspension systems, our topoftherange 4link kits allow for perfectly balanced triangulation, providing great handling and traction. Calculates all possible instant center locations plus percentage of rise and squat. Quickly change instant centers without affecting pinion angle, preload, or wheelbase. The angled upper links provide lateral support for the rearend housing, eliminating the need for an additional panhard bar or watts link system. How to buy and setup a four link 9inch rearend hot rod. When building a 4link suspension, the lengths of the links, their positioning, and the angles at. Lift bars, slapper bars, super stock springs, leaf links, ladder bars, threelinks, fourlinks, and torque arms there may be others too, but its a start. If you are on the market for a more indepth, customizable 4 link suspension calculator, you will likely need to purchase software. The calculations vary from motion ratios, to spring stiffness, to wheel loads.
The calculator is designed for offroad, so the preloaded rod end choices are heavy duty ones. Choose from jegs, competition engineering and other high strength 4 link suspension kits or replacement parts. The 4link calculator lets you input, view, save, analyze and compare your 4 link rear suspension geometry. With this easy to use software you are able to save, rename, and also print multiple 4link. Upper and lower virtual aarms, steering link front upper and lower virtual aarms, toe link rear as used on some mercedes rear. This program is provided free of charge for personal use in the assisting of suspension calculations. A popular choice for rear suspension systems and gaining in popularity as a choice for front suspensions, our 4 link suspension kits allow for perfectly balanced triangulation, providing maximum control even at high speeds.
The first step in either building a 4 link suspension or troubleshooting an existing suspension is to download one of these triaged calculators created by dan barcroft and plug in the dimensions and weights it asks for. Universal 4link plotter digital download quartermax. Using software from performance trends, we set the fourlink to 46. The shorter the links are, the more all of these parameters will change as the suspension moves, and the greater the chance that the suspension will start to bind up to a significant degree. Read more about 4 link comparison triangulated vs parallel. Double triangulated 4 link crossmember kit genright jeep. Performance trends offers a few different options, including a free trial. What the parallel fourlink gives up in strength compared to the radius arm, it makes up for in better ride quality and handling. The suspension calculator aims to help people who are building race cars perform suspension related calculations. Chris alstons chassisworks, inc chassisworks weldin. A link length change of 1 or a link angle change of 5. Autoware autoware inc rear suspension geometry software. The 4 link is a relatively complex rear suspension that is very sensitive to adjustments.
The suspension analyzer does a complete 3d suspension analysis, including bump steer, ackerman, caster gain, anti dive, tire scrub, camber gain and much more. It looks just like pitch rotation except the front doesnt rise. Used by many of the best teams in drag racing, chassis master is easy to set up and input information. Add a 4 link suspension kit to your car or truck to add performance and adjustability to your suspension. Performance trends 4 link calculator demo movie saving and. With this easy to use software you are able to save, rename, and also print multiple 4 link. Most of our 4links are sold in complete rear suspension packages. Figure 4 three link front left and four link rear rightshows a three link and four link system. Tci 4754 chevy pickup truck 4 link rear suspension kit. It is the parallelprojected length along the horizontal axis. Over the years, drag racers with door cars have gone through all sorts of suspension arrangements. Many people do not take this into any consideration with 4 link or ladder bars or 3 link suspension. A fullyadjustable 4 link suspension allows you to move the instant center not only up or down, but also forward or back by increasing or decreasing the angle between the bars.
On this episode of rock rods tech jake burkey teaches us about the dos and donts of building a double triangulated 4 link suspension. A 4link suspension system is commonly used to replace leaf springs and shocks in vehicles to provide much greater stability while cornering, greater tire contact and traction for drag racers, and reduces body roll in lifted offroad trucks and suvs. The flatter the top bar, the easier it is to use its pull on the chassis to plant the tire. Rear 4 link suspension on the suburban reckless wrench garage duration. You need very little spring for drag racing as your 4 link is doing so much. Triangulated 4link rear suspension street rod engineering. Putting a triangulated 4 link under your car or truck is one the best upgrades you can make.
Education software downloads 4 link calculator by performance trends inc and many more programs are available for instant and free download. There is no comparison to any other 4link software available. Calculate the 4link setup in any car, with any brackets in less than 15. The parallel fourlink needs a track bar to locate the axle side to side. A typical 4 link will have the rear attaching point of the top bar a few inches above the axle center but will have the attaching point of the bottom bar several more inches below the axle center. To do this you will need some kind of angle finder, either digital or a. All types of tech info on racecar engines, chassis and suspension setup for road. Racing suspension calculator fsvd time your dimention your time october 19, 2018 at 7. Adjustable 4link suspension system is infinitely adjustable with 18 inch increments allowing hundreds of instant center options. Chassis master software tim mcamis performance parts. Putting a triangulated 4link under your car or truck is one the best upgrades you can make. Download 4 link suspension calculator for free windows. Figure 4 three link front left and four link rear right fourlink suspensions, 2007 the three link suspension in figure 4 three link front left and four link rear right uses three primary links shown in blue. Double triangulated 4 link design eliminates the need for a rear trac bar, allowing you to stretch the rear axle back.
Computer program to simulate and analyze rear suspension 4link. Of all of the systems, the most common youll see today is the equal length fourlink, probably followed by the ladder bar. Anytime you add a pivot, you add a wear item and the potential for deflection. Typical rear suspension screen, here analyzing an angled 4 link rear suspension and driveshaft movement and u joint angles. Rear suspension design three link four link two link. Track all chassis information including corner weights and center of gravity. From a practical standpoint, its hard to have links that are too long. It also has a link bending calculation assuming the rig is hungup with half the vehicle weight resting on the center of the link.
We can make a triangulated 4link to the specifications of your frame and chosen rear end. Jerry bickels 4link wizard professional version jerry bickel race cars, in cooperation with etc, inc. Pro series 4link kit with billet adjustable shock mounts. Performance trends 4 link calculator demo movie saving and more. The metric fourlink suspension design is a bit different than most other rear suspensions. The most popular version among the software users is 2. Upper lateral link, lower reversed aarm, twin trailing links rear the classis 60s sports and racing car rear suspension. Actual linkbars finish color is texturedblack powder coat. Crafted from the highestgrade components and offered at competitive prices, our products guarantee the. You enter heights above the ground and distance ahead of the front axle for up to 6 holes for all 4 brackets for your car, or any number of cars. Unfollow 4 link rear suspension kit to stop getting updates on your ebay feed. Lower lateral link, upper reversed aarm, twin trailing links rear a variation on. Along with the movement of the chassis, the front link attachment points move, and the rear ones move correspondingly.
The driveshaft will be on a slight angle downwards in relation to the yoke in the rearend. Transferring all of that engine torque to the rear wheels requires a good rear suspension system to handle it. The 4link calculator lets you input, view, save, analyze and compare your 4link rear suspension geometry. The first step in either building a 4link suspension or troubleshooting an existing suspension is to download one of these triaged calculators created by dan barcroft and plug in the dimensions and weights it asks for. Links may be made to the site, but the product may not be redistributed in any way other than by direct download from. They include the 4link with frame and housing brackets, coilover rear shocks with springs ratematched to your application and a choice of a panhard bar for street use or diagonal link race. Enter the dimensions of your 4 link system and it will automatically calculate wheelbase change, suspension cage index angle, and shock length throughout the suspension travel. Design of three and four link suspensions for off road use.
Unlike ladder bars, a fourlink rear suspension provides many chassis adjustment choices, resulting in numerous possible instant centers. If your car wheel stands too much, you can angle the 4 link bars closer together at the. No part of the program or code shall be reproduced for commercial use. When designing or tuning a 4 link, it is important to understand the relationship between link lengths and angles and how the relationship affects roll steer. Instant center calculator for your drag car suspension. The higher it is the more leverage it has on the axle and the more youll.
Metric fourlink suspension design circle track magazine. This configuration is common in general motors cars built in. So how do you ever get it right,, test and test and test, making sure to log tire psi, shock settings, track conditions, enviornmental conditions that would. On any rear suspension system assuming it is a fullforward system, even a twolink, moving the ic higher will produce a higher percentage of antisquat, making the truck not squat as. Another fourlink design is the triangulated fourlink. Vehicle travel is simulated by dragging the image with the mouse or with a scroll bar. Fourlink kits create a definitive center for a rear suspension, and are commonly used with a. The angle of the top bar is the final ingredient to determining how much bite the tire will have, and for how long. It makes sense, since this is the bar that also dictates the ic once the rest of the parameters are set. Chris alstons chassisworks, inc chassisworks pro 4link.
Tci parabolic 5559 chevy pickup truck 4 lowering rear leaf kit. The universal triangulated 4link enables you to install a hightravel rear suspension using a minimum of components and custom fabrication. The 4 link calculator allows you to design, cost, and order complete linkages of multiple different styles, length, sizes and configurations. You can also use this function to compare front and rear suspension although be careful as only the model at the front of the drawing is saved within the url.