Chase, 1977 was the use of the software to analyse suspension geometry. Drag racing suspension tim mcamis performance parts. How do you make the ladder bar adjustable so that you can tune it from a range of short, high. From this i could generate drawings to suit the mcsorley 442 dimensions. The length of the bars and the adjustable lower link make a weld on diagonal link a natural. I think it is because the geometry of triangulated ladder bars do the job of controlling axle wrap and location without the stress induced by parallel bars. The ladder bars are then removed from the front brackets, and the crossmember is welded to the frame. This is when the yoke of the rearend is tilted upward more than the driveshaft. The classis 60s sports and racing car rear suspension. Option lets you display the static bar angles at ride height. On my 79 malibu stock suspension car i started and stayed wit 17.
The only time to use a weld on diagonal link is when ladder bars are being installed. The housing is brought back out from under the car and the ladder bars are removed from the brackets. A ladderbar setup is only intended for drag racing, and for that application it works very well. The universal design allows you to position your engine and transmission. The ladder bar prevents excessive suspension wrap up by pushing up on the frame at the point of forward connection basically the point where the upper and lower bars of the ladder bar intersect. To give the car more lateral traction, go to a softer right rear bar or a stiffer right front spring. Look closely and youll notice that as the suspension cycles though its travel, the rearend housing rotates around. Aftermarket components like yokes and linkages can be measured and input by the user. This suspension design software lets you take into account various characteristics of your car, such as corner weights, the suspension type, the suspension geometry, wheel widths and offsets, and wheelbase to intelligently select springs coil, leaf, and torsion bar springs and sway bars also called swaybars, antisway bars, or antiroll bars. The bars of a ladder bar suspension shouldnt be confused with the links of a 4 link. The idea is to plant the tires and keep them planted. Rear suspension design three link four link two link. This also allows for better tuning, such as ride height and with adjustable shocks, the damping factor.
Put the bars in the bottom hole then play with the pinion angle shocks and the rate of travel on the front suspension also to get a good smooth travel, she will hook and stay hooked even in the dirt. Spec is software for tuning motorcycle suspension and chassis geometry. What makes ladder bars and the 4link so effective is the controlled movement of the suspension. The typical leaf spring rear suspension will need 57 degrees of negative angle. In 2019 this feature expanded to also showing static bar length and bar length changes with a new option. One of the main characteristic problems with using competition ladder bars on the street is due to the fact that they do not allow the rear axle within to twist. A ladder bar setup is only intended for drag racing, and for that application it works very well. Like all other morrison frame components, the subframes are individually cadengineered for the exact year. The length of the bars and the adjustable lower link make a weld on diagonal link. Traction bars and ladder bars ford power stroke nation. Ladder bar the ic is the front ladder bar mounting hole. 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. Torque arm rear suspension type like 3rd and 4th generation camaros. Calculate the 4link setup in any car, with any brackets in less than 15.
Here you will find only the highest quality drag racing suspension components available. Then, when you weigh it, you can see what the actual weights are. As a base point, in order to calculate the standard suspension geometry accurately, i used chris gibb. Portal axles or portal gear lifts are an offroad vehicle suspension and drive technology where the axle tube or the halfshaft is offset from usually above the center of the wheel hub and where driving power is transferred to each wheel. Pressing the edit button immediately switches to edit mode listing more details about the dimensions of the model and allowing you to. Competition engineering panhard bars and diagonal links eliminate sidetoside movement of the rear axle housing within the chassis. Since the rear im installing already has the ladder bar brackets welded on evenly from side to side, im assuming all i need to do is line it up from side to side and measure the distance between the frame where the front hangars mount and the axle tubes to make sure both sides are even from the front, set the pinion angle, slap the ladder. Since the radius arms are fixed at the axle end, the caster angle changes when the suspension cycles up and down, shown in the figure above. Competition engineering panhard bars and diagonal links jegs. Speedway style rear suspension, using a winters torque tube axle, 4 links, birdcages and jacobs ladder. Computer program to simulate and analyze rear suspension 4link setups for instant center, pinion. Upper lateral link, lower parallel links, twin trailing link rear a variation of the reversed lower aarm style.
Lower lateral link, upper reversed aarm, twin trailing links rear a variation on the above. Ladder bars are pretty simple and durable, but the bracket welds are a. A ladder bar suspension is a fine lowcost hardreacting suspension that is great for drag racing, but for street use it can be a highmaintenance, roughriding, illhandling suspension. A ladder bar or 4link setup is much more rigid and therefore usually only needs degrees. Lengths of springs lr should be identical to start, at your chosen ride height. Our suspension analyzer lets you import actual shock travel data to simulate what your car is doing.
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. Ladder bars are easier to tune for the novice than the 4link and, when set up correctly, provide the same benefits. 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. All chassis dimensions and specifications are editable. Bottom bar of a proper 4link or bottom bar side of ladder bar or bottom bar os 3link. The bar of a ladder bar car is merely an extension of the axle housing and, as such, its angle relative to the ground is of no concern. Ladder bar suspensions chris alstons chassisworks, inc. Paul talks a little on suspension geometry and works on the 1969 amx. Chris alstons chassisworks, inc chassisworks ladder bar. From infinitely adjustable 4link brackets to heavy duty 4link bars, antiroll bars, sway bars, wishbone and housing locator kits all the way to penske shocks, nitrogen fill kits, strange engineering components and more, you can find what it takes to put together a stateoftheart rear suspension. Once you correct the geometry ill take the stock 4 link suspension any day over ladder bar on any track and power level but i also know how to make the stock mustang suspension work. Watch the rear axle implode on this plymouth belvedere drag. 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. Traction has been assumed to be at the front wheels.
The threads at the leading end of the bar allowed it to. Ladder bar and fourlink suspension assemblys magnum force inc. Ladder bar suspension how to after recording all the necessary measurements of the stock location of the rear housing, pull the housing out from under the car, strip the axle tubes of everything except the brakeline brackets, and cut them to accommodate the desired wheeltire size. Choose from jegs, competition engineering and other high strength 4 link suspension kits or replacement parts. The ic is the imaginary point of intersection if you were to draw a line along the length of the lower and upper control arms forward. The ladderbar suspension system was never used by oems on any muscle car. Rear suspension screen lets you describe 8 different types of rear suspensions.
Parallel 4 link with panhard bar, triangulated 4 link, triangulated with the uppers, triangulated with the lowers, triangulated toward the axle, triangulated toward the center of the vehicle, so on and so forth until you have a good understanding of how dimensional. This is the kit that started it allthe gts front suspension for mopar muscle cars. Suspension types include trailing arms which includes 3 links and truck arms with coil springs, torsion bars, jacobs ladder and panhard bars, leaf springs, and various 4 links like metric, chevelle and late model mustangs. A ladder bar travels on an arc, where a leaf spring setup is a vertical. I mention this only because many ladder bars have found their way onto many muscle cars over the years. Add a 4 link suspension kit to your car or truck to add performance and adjustability to your suspension. Its used on the rear axle, and its sole purpose was to eliminate axle wrap and control the pinion angle without binding the suspension. With this easy to use microsoftwindows friendly software you are. Like the 4link, ladder bars use a coilover shock to support the weight of the vehicle. Control arm bolts are measured from the ground up to the center of the bolts. Apr 01, 2008 for simplicitys sake, we used a ladder bar in the rollsteer diagram on p. For those applications where the builder wishes to adapt a morrison 4link suspension to an existing chassis, special rear subframe assemblies are available.
A ladder bar rotates more than a 4link, just like a leaf spring car. Dec 04, 2014 like the 4link, ladder bars use a coilover shock to support the weight of the vehicle. Pressing the edit button immediately switches to edit mode listing more details about the dimensions of the model and allowing you to alter the model by dragging any of the tether points. You never want the rearend setup with positive pinion angle. The goal is to keep the leaf springs from being twisted by the torque of the axle. A track bar runs from the frame to the axle perpendicular to the radius arms to keep the axle centered on the frame. Stage ii ladder bar suspension with shocks and springs. Get a 110 scale rc truck and build the link suspension yourself from scratch, over and over in as many ways as you can think of. How to build a winning drag race chassis and suspension. Most importantly, each clip is custom designed and built for the intended application using contemporary cad technology. The ears at the top of the housing, used for mounting the stock link bars, will be removed to provide clearance for the panhard bar. It is the parallelprojected length along the horizontal axis. For street, bodychassis roll is usually more pronounced with more compliant suspension. Rear clips ladder bar information narrow rear end and wide tires no problem.
Autowares racing and performance tech site 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 suspension analyzer does a complete 3d suspension analysis, including bump steer, ackerman, caster gain, anti dive, tire scrub, camber gain and much more. A ladder bar goes down the more torque you have, up for less. Chevrolet camaro ss drag race development program continues to tune the camaro. It is quite easy to install and maintain, and typically requires fewer floorboard modifications.
The travel will always occur the same way, every time. The 4link calculator lets you input, view, save, analyze and compare your 4link rear suspension geometry. I installed the old ladder bar years ago when i first went spring over in my cj7. Pro street ladder bars on this page auto weld chassis.
Suspension geometry an overview sciencedirect topics. Susprog3d is the premier kinematic suspension design and analysis tool. Radius arm designs have been used by ford and dodge among others. Fourlink the upper and lower bars are angled toward each other. Ladderbar suspension how to after recording all the necessary measurements of the stock location of the rear housing, pull the housing out from under the car, strip the axle tubes of everything except the brakeline brackets, and cut them to accommodate the desired wheeltire size. Transferring all of that engine torque to the rear wheels requires a good rear suspension system to handle it. Autoware autoware inc front suspension geometry software.
Robs rod shop drag racing suspension episode 1 basic 4 link duration. For drag racing, suspension flexibility is not so much a concern as with street driven vehicles. If you have a lot of suspension travel and do a full ladder bar, if you dont use a rear end floater, it will break at some point. This will tighten the car in the lateral and the longitudinal directions depending of course on. I was wondering if anyone here was running drag radials with a ladder bar and what air pressure did you start at. A ladder bar suspension is a substantial improvement over a stock suspension that may utilize a pair of leaf springs or trailing arms and helps eliminate spring wrapup on leaf spring equipped cars.
At some point you will want to enter your own suspension geometry data or even just just view the current model in more detail. Our ladder bar packages include our double adjustable ladder bar kit, crossmember tube with brackets, axle housing mounts, spring mounts, strange coil over shocks and rate matched springs. Spec is software for tuning motorcycle suspension and chassis geometry 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. Most confusion surrounding the rear suspension linkage ladder barfourlink is in the actionreaction torque around the rear axle and its housing. This is a simple triangularshaped device that connects the rearend housing to the frame. Dsp suspension design software for automobile springs and. Indeed, antiroll bars provide an attenuation effect in the gain of the roll angle. Best ladder bar angle for transbrake launch dragstuff. The ladder bar suspension system was never used by oems on any muscle car. Sportsman ladder bars pro ladder bars with integral shock mount all specifications and prices listed throughout the website and linked documents are subject to change. The inconsistancies come from the poor geometry of the stock suspension trying to unload the tires.
Morrison makes it easy to install narrowed rear end and wide tires with this factorywelded ladder bar rear suspension subframe assembly. Materials used are of the same high quality as that of pro street ladder bars. Now the attaching points are much closer to center than the previous example i. Typically used in drag racing applications, diagonal links are superior to the panhard bar for eliminating sway in ladder bar and 4link suspensions. Previously i had begun this on another board and it got too large. In this article well cover what we consider to be the three most important elements.
Typical rear suspension screen, here analyzing an angled 4 link rear suspension and driveshaft movement and u joint angles. For windows 7, 8 and 10 with opengl see the faq for more details faq for more. Instant center calculator for your drag car suspension. The ladder bar provides adjustability on the front side bar to chassis and a static mount to the rear. Suspension geometry characteristics of a live axle are as follows. With a ladder bar solidly attached to the rear end. Complete graphs and reports are included, and several new. For simplicitys sake, we used a ladder bar in the rollsteer diagram on p. Ladder bar suspension installation questions for a. For windows 7, 8 and 10 with opengl see the faq for more details faq for more details. He should be able to remove and install the right rear ladder bar to cross member bolt with only slight resistance it should be even in the hole updown.
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