Rear triangulated 4 bar bushings and geometry the h. Rear suspension analysis tuning all types with heavy emphasis on 4 link, z link and swing arm types. Once you have both the front and rear suspensions defined, and some basic vehicle info, the software can now make some handling predictions. The 4link calculator lets you input, view, save, analyze and compare your 4link rear suspension geometry. In this article well cover what we consider to be the three most important elements. This system however has about the least amount of compromise for a solid rear axle in its design. What are the major obstacles and are there any outsidethebox solutions bent ds upper link, high clearance oil pan, shorter upper arms like the rear, etc.
A newer style that is only just now becoming stock in just a few vehicles and that works well as performance type of suspension. These systems are commonly found on vehicles used for the. This configuration is common in general motors cars built in and around the 1980s as well as some ford. I have 19 inch long lowers center to center a 21 inch torque link at a 17. Apr 01, 2008 on any rear suspension system assuming it is a fullforward system, even a two link, moving the ic higher will produce a higher percentage of antisquat, making the truck not squat as much during. This configuration is common in general motors cars built in. Using your three link suspension to dial in your car is a viable adjustment option that can be performed quickly right at the track.
Autoware autoware inc rear suspension geometry software. The lower left rear control arm is adjusted to increase the amount of rear steer. Lower lateral link, upper reversed aarm, twin trailing links rear a variation on. However, thanks to the constant technological advancements, the multilink. Like all ridetech 4links, this design features rjoint rod ends.
The glink torque arm systems directly replace the oem rear suspension for remarkably improved handling and performance. Rear suspension geometry this is a software package that addressesthree. Mar 23, 2005 looking for some info on seting up a 3 link rear suspension. Depending on the type of suspension, the roll center can be an actual pivot point or a virtual point in space and they dont necessarily lie along the center line of. Rear suspension design three link four link two link.
The roll center, as its name implies, is the center of rotation for a suspension system. Feb 01, 2017 calculating the geometry of a single link bar is fairly straight forward, assuming that you know what the parts are called and how to use them. On any rear suspension system assuming it is a fullforward system, even a two link, moving the ic higher will produce a higher percentage of antisquat, making the truck not squat as much during. This suspension system has all 3 links running parallel to each other. Each system is comprised of a fabricated torque arm, a pair of glink pivotball tubularsteel or billetaluminum lower arms, a watts link lateral locator, varishock coilovers, weldon frame brackets, and optional billetarm. Now you could also make a way to change the forward andor rear lower bar mounting position and in essence end up with a factory but modified adjustable 4 link. On a fourlink suspension, the suspension arms are adjusted so the reardifferential assembly is pulled forward on the left side and pushed back on the right side.
Performance trends offers a few different options, including a free trial. Quickly and easily see the affect movement has on your suspension setup and adjust on the fly using the drag and drop editor. The upgraded 3link rear suspension is standard in type 65 coupe complete kit. The standard 4link rear suspension is a great performance street car suspension. Why is threelink suspension a great feature to install in your custom hot rod. Design, analysis and fabrication of rear suspension system. The setup leads to a stance that is undoubtedly recognizable a wide front end. Each system is comprised of a fabricated torque arm, a pair of g link pivotball tubularsteel or billetaluminum lower arms, a watts link lateral locator, varishock coilovers, weldon frame brackets, and optional billetarm.
Motospec has been designed for racing use, with a simple interface and clear outputs, to assist motorcycle tuners and race teams make quick and knowledgeable decisions. Susprog3d is a complete 3d software package for the design, setup, evaluation and visualization of. When duplicate and compare is active this button switches the order of the front and rear models. One of the most common questions we get about suspension setup and tuning is how 4 link geometry affects the performance and handling of a vehicle. This thesis outlines the process of designing a three link front, and four link rear suspension system. The teams that experiment with the proper three link set up can find the set up that launches their car off the corner with more acceleration to get to the checker first. Upper link axle mount, if using the ffr moser axle skip to the next section since the upper link bracket is welded to the axle. The wider track width allows for improved dynamic stability.
It a pain in the ass to fit a fully triangulated 4 link setup under the front of your rig which is why you see a lot of people running a 4 link in the rear and a 3 link setup in the front. If it is hard to put all of the bolts in the mount holes, put. The metric fourlink suspension design is a bit different than most other rear suspensions. The suspension calculator aims to help people who are building race cars perform suspension related calculations.
In the rear suspension chapter, you talk about using a 3 link rear suspension on dirt, with the upper link having an ideal length of 41 inches and mounted downhill at a 20degree angle. The choices made here will determine the length and height of the instant center. If you are on the market for a more indepth, customizable 4 link suspension calculator, you will likely need to purchase software. Use to analyze all popular oval track coil spring rear suspensions. There is a roll center for the front suspension and rear suspension. I have an abody mopar im wanting to put a 3link in but am not sure of the geometry.
Looking at various rear suspension configurations, design a rear suspension. Suspension geometry an overview sciencedirect topics. Ford integral link independent rear suspension as used on the 2015 mustang. Mgb suspension upgrades, tech session by ted lathrop of fast. Antisquat in a linked suspension system determines how the rear end of a. Figure 4 three link front left and four link rear right four link 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. Design of three and four link suspensions for off road use. Our standard 4link suspension comes with custom antisquat geometry and ready to accept ford mustang 8. Metric fourlink suspension design circle track magazine. Dec 06, 2019 with a normal 4 link, when you hit the brakes, the suspension geometry wants to lift the rear of the vehicle. Allows roll and bump or rebound suspension movements. Roll steer, drive angles, birdcage indexing effects, trailing arm toe, panhard devices, lift and pull bars, 6th coils, damper shocks, stacked, 2 step and double spring. This kit is intended for axles without a front truss. Race wise rear suspension geometry software afco racing.
Depending on the type of suspension, the roll center can be an actual pivot point or a virtual point in space and they dont necessarily lie along the center line of the vehicle. Figure 4 three link front left and four link rear rightshows a three link and four link system. Oct 14, 2015 suspension geometry software for purchase. It includes graphs and suggestions for changes to your geometry. When the upper bars are reversed, this dynamic is eliminated or even reversed when you hit the brakes the suspension actually unloads the tires. What angles should i start with on the lower links and the panhard bar. Upper and lower virtual aarms, steering link front upper and lower virtual aarms, toe link rear as used on some mercedes rear.
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. Rear suspension geometry this is a software package that addressesthree link suspensions and late model four link floaterstyle. It is also difficult to tune the geometry without a full 3d computer aided design analysis. Watch as we cover some of the steps to install our 3 link rear suspension system.
However, thanks to the constant technological advancements, the multi link suspension has moved from the. All chassis dimensions and specifications are editable. This document, the associated hardware, software, drawings, and other material. Each mount is built at a neutral angle to keep the suspension joints in a position so they do not waste any of the joints rotation and cause damage to the joint in those crazy articulation spots on the trail. Apr 19, 2005 it includes graphs and suggestions for changes to your geometry. This program is provided free of charge for personal use in the assisting of suspension calculations. Here is ridetechs universal triangulated 4link rear suspension system.
Design of a rear suspension configuration for a live. One only has to walk among the rows of lowered trucks at any show and peek through the holes in the bed floors to see the plethora of ways to make the rear axle of a truck cycle up and down. The only aftermarket link type suspension that i have come across that does not bind is a threelink using spericalheim joints one link on each end of the rear. What angles should i start with on the lower link s and the panhard bar. Kit can be used with johnny joints or the big 16 fk heims.
Take a look at performance trends calculators here. Rear suspension analysis tuning all types with heavy emphasis on 4link, zlink and swing arm types. Upper lateral link, lower reversed aarm, twin trailing links rear the classis 60s sports and racing car rear suspension. While ron loves to use software to work out combinations, his 38 years of. The trailing arm angles affect the rear steer and bite and the pull bar, or lift arm, can redistribute load upon acceleration and deceleration. Test fit the two halves of the upper arm mount together. The threelink setup puts that upper axle joint under greater side loads than the upper two links of a fourlink, but it is a viable alternative. We are designing the front suspension, and will input data for the lh side. If it was possible, would it truly be the best of both worlds suspension. Finding your center finding your front and rear roll center.
Software for auto racing and high performance cars data acquisition systems new and used engineering services and live seminars on performance and racing technology all types of tech info on racecar engines, chassis and suspension setup for road. Each car needs to be evaluated for where it is to be raced and then set correctly. The ultimate racing car chassis setup guide and tutorial. The dirt car rear geometry layouts are varied and usually highly adjustable for both late models and modifieds. Rear suspension screen lets you describe 8 different types of rear suspensions. If it is hard to put all of the bolts in the mount holes, put in as many as you can then use a. With a normal 4 link, when you hit the brakes, the suspension geometry wants to lift the rear of the vehicle. Calculating the geometry of a single link bar is fairly straight forward, assuming that you know what the parts are called and how to use them.
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. The fourth link is a panhard rod, which keeps the axle located sidetoside. We see it all the time, the guys that only widen the front and leave the rear stock. These decisions will ultimately impact how the car. The plus version lets you include 8 types of rear suspensions on your car.
Links may be made to the site, but the product may not be redistributed in any way other than by direct download from. We also have a quick overview and close up of our full floating 9 rear. Wingeo3 inputting dimensions to analyse four link geometry. There are many thick textbooks, expensive software, and. Spec is software for tuning motorcycle suspension and chassis geometry. Prerunners use aarms or ibeams to be able to create the type of suspension travel needed to handle the desert. In fact, the suspensions geometry needs to be checked with design analysis software. Jun 17, 2009 in fact, the suspension s geometry needs to be checked with design analysis software. The figure 4, 5, 6 shows the suspension geometry in lotus suspension analysis software. Theres a couple reasons why you would choose a 3 link setup vs a 4 link with the main reason being packaging. Rear shock dampening control is needed after making any extreme bar angle changes to that style of suspension. This kind of suspension always has some kind of panhard bar to keep the axle centered. The three links that extend forward locate the axle forwardtoback and restrict its rotation e. Artec industries easy 3 link kit g adjustable upper link.
Ironically, a threelink suspension is usually composed of four links plus two coilover shock absorbers. My modified uses a 15inch long rubber biscuit upper link attached to a roll cage cross bar behind the cockpit, and with no axle damper shock. Artec industries easy 3 link kit g adjustable upper link this kit is based off our most popular parts weve sold our customers for a 3link with panhard bar. Part 1 rear end alignment part 2 pinion angle part 3 preload part 4 antiroll bar part 5 ride height part 6 basic 4link settings. Dynatune suspension design module kinematic modeling. When you or your chassis builder installs the rearend in your car with a fourlink setup, thats the time to decide exactly which bracket holes you will use for the links. If you press this button in edit mode its easy to compare the setup values of each model. Roll steer, drive angles, birdcage indexing effects, trailing arm toe, panhard devices, lift and pull bars, 6th coils, damper shocks, stacked, 2 step and double spring arrangements, 5th coils and shocks, leaf springs, tall vs. The calculations vary from motion ratios, to spring stiffness, to wheel loads. One of the most common questions we get about suspension setup and tuning is how 4link geometry affects the performance and handling of a vehicle. The most complete racing car chassis setup tutorial guide available presented by shown above is a gaming expo fair in europe that held a contest for the best gamer team in a newly released 1st shooter game competition. Autoware autoware inc front suspension geometry software. Sep 01, 2009 the metric four link suspension design is a bit different than most other rear suspensions. Three links suspension hot rod garage tech tips ep.
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