Race wise rear suspension geometry software afco racing. Finding your center finding your front and rear roll center. This suspension system has all 3 links running parallel to each other. We see it all the time, the guys that only widen the front and leave the rear stock. The dirt car rear geometry layouts are varied and usually highly adjustable for both late models and modifieds. 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. The standard 4link rear suspension is a great performance street car suspension. 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. It is also difficult to tune the geometry without a full 3d computer aided design analysis. 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. This program is provided free of charge for personal use in the assisting of suspension calculations. While ron loves to use software to work out combinations, his 38 years of. Quickly and easily see the affect movement has on your suspension setup and adjust on the fly using the drag and drop editor. The roll center, as its name implies, is the center of rotation for a suspension system.
What angles should i start with on the lower links and the panhard bar. Each car needs to be evaluated for where it is to be raced and then set correctly. I have 19 inch long lowers center to center a 21 inch torque link at a 17. Upper lateral link, lower reversed aarm, twin trailing links rear the classis 60s sports and racing car rear suspension. 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.
This thesis outlines the process of designing a three link front, and four link rear suspension system. Compliance under load can have an important effect and must be checked using a multibody simulation software. However, thanks to the constant technological advancements, the multilink. The ultimate racing car chassis setup guide and tutorial.
There is a roll center for the front suspension and rear suspension. 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. 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 document, the associated hardware, software, drawings, and other material. 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. The plus version lets you include 8 types of rear suspensions on your car. The suspension calculator aims to help people who are building race cars perform suspension related calculations. Here is ridetechs universal triangulated 4link rear suspension system. If you are on the market for a more indepth, customizable 4 link suspension calculator, you will likely need to purchase software. The glink torque arm systems directly replace the oem rear suspension for remarkably improved handling and performance. When the upper bars are reversed, this dynamic is eliminated or even reversed when you hit the brakes the suspension actually unloads the tires. These decisions will ultimately impact how the car. 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.
Why is threelink suspension a great feature to install in your custom hot rod. The fourth link is a panhard rod, which keeps the axle located sidetoside. The 4link calculator lets you input, view, save, analyze and compare your 4link rear suspension geometry. Oct 14, 2015 suspension geometry software for purchase. The setup leads to a stance that is undoubtedly recognizable a wide front end. The choices made here will determine the length and height of the instant center. Use to analyze all popular oval track coil spring rear suspensions.
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. Rear suspension analysis tuning all types with heavy emphasis on 4link, zlink and swing arm types. Mgb suspension upgrades, tech session by ted lathrop of fast. 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. Design of three and four link suspensions for off road use. If it is hard to put all of the bolts in the mount holes, put. 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. This allows us to specify the wheel location both laterally and longitudinally, which will then calculate the track, wheelbase and wishbone link lengths. Ford integral link independent rear suspension as used on the 2015 mustang. Rear triangulated 4 bar bushings and geometry the h. I have an abody mopar im wanting to put a 3link in but am not sure of the geometry. 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. Weve taken the knowledge from running thousands of miles of trails and developed suspension kits with optimized geometry for unmatched bindfree suspension performance.
Like all ridetech 4links, this design features rjoint rod ends. 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. It includes graphs and suggestions for changes to your geometry. The metric fourlink suspension design is a bit different than most other rear suspensions. These unwanted characteristics are caused by incorrect 4link geometry and they. The g link torque arm systems directly replace the oem rear suspension for remarkably improved handling and performance. What angles should i start with on the lower link s and the panhard bar.
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. Artec industries easy 3 link kit g adjustable upper link. Watch as we cover some of the steps to install our 3 link rear suspension system. When duplicate and compare is active this button switches the order of the front and rear models. With a normal 4 link, when you hit the brakes, the suspension geometry wants to lift the rear of the vehicle. Susprog3d is a complete 3d software package for the design, setup, evaluation and visualization of. 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. This kit is intended for axles without a front truss. Once you have both the front and rear suspensions defined, and some basic vehicle info, the software can now make some handling predictions. 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. Rear suspension design three link four link two link. 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. Rear suspension analysis tuning all types with heavy emphasis on 4 link, z link and swing arm types. Design of a rear suspension configuration for a live.
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. Rear suspension geometry this is a software package that addressesthree link suspensions and late model four link floaterstyle. This kind of suspension always has some kind of panhard bar to keep the axle centered. Lower lateral link, upper reversed aarm, twin trailing links rear a variation on. The only aftermarket link type suspension that i have come across that does not bind is a three link using spericalheim joints one link on each end of the rear. Rear suspension screen lets you describe 8 different types of rear suspensions. Wingeo3 inputting dimensions to analyse four link geometry. 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. Mar 23, 2005 looking for some info on seting up a 3 link rear suspension.
In this article well cover what we consider to be the three most important elements. All chassis dimensions and specifications are editable. Using your three link suspension to dial in your car is a viable adjustment option that can be performed quickly right at the track. 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.
Design, analysis and fabrication of rear suspension system. Sep 01, 2009 the metric four link suspension design is a bit different than most other rear suspensions. 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. This configuration is common in general motors cars built in and around the 1980s as well as some ford. Theres a couple reasons why you would choose a 3 link setup vs a 4 link with the main reason being packaging. Rear suspension geometry this is a software package that addressesthree. Upper and lower virtual aarms, steering link front upper and lower virtual aarms, toe link rear as used on some mercedes rear. 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. The upgraded 3link rear suspension is standard in type 65 coupe complete kit.
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. Figure 4 three link front left and four link rear rightshows a three link and four link system. Susprog3d suspension by design is a complete software package enabling the design, evaluation. Links may be made to the site, but the product may not be redistributed in any way other than by direct download from. Rear shock dampening control is needed after making any extreme bar angle changes to that style of suspension. The lower left rear control arm is adjusted to increase the amount of rear steer. Jun 17, 2009 in fact, the suspension s geometry needs to be checked with design analysis software. 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. 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. 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. This configuration is common in general motors cars built in. 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. We also have a quick overview and close up of our full floating 9 rear.
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. Dec 06, 2019 with a normal 4 link, when you hit the brakes, the suspension geometry wants to lift the rear of the vehicle. Autoware autoware inc front suspension geometry software. The wider track width allows for improved dynamic stability. Take a look at performance trends calculators here. The trailing arm angles affect the rear steer and bite and the pull bar, or lift arm, can redistribute load upon acceleration and deceleration.
This system however has about the least amount of compromise for a solid rear axle in its design. There are many thick textbooks, expensive software, and. 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. Our standard 4link suspension comes with custom antisquat geometry and ready to accept ford mustang 8. Performance trends offers a few different options, including a free trial. These systems are commonly found on vehicles used for the. The three links that extend forward locate the axle forwardtoback and restrict its rotation e. Autoware autoware inc rear suspension geometry software. 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. 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. Test fit the two halves of the upper arm mount together. However, thanks to the constant technological advancements, the multi link suspension has moved from the. If it is hard to put all of the bolts in the mount holes, put in as many as you can then use a.
The calculations vary from motion ratios, to spring stiffness, to wheel loads. Three links suspension hot rod garage tech tips ep. 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. We are designing the front suspension, and will input data for the lh side. 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. Kit can be used with johnny joints or the big 16 fk heims. Spec is software for tuning motorcycle suspension and chassis geometry. Looking at various rear suspension configurations, design a rear suspension.
Prerunners use aarms or ibeams to be able to create the type of suspension travel needed to handle the desert. Suspension geometry an overview sciencedirect topics. A newer style that is only just now becoming stock in just a few vehicles and that works well as performance type of suspension. No part of the program or code shall be reproduced for commercial use.
The figure 4, 5, 6 shows the suspension geometry in lotus suspension analysis software. Dynatune suspension design module kinematic modeling. 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. Ironically, a threelink suspension is usually composed of four links plus two coilover shock absorbers.