The Standard 4-Bar System Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. As a result, loose roll steer is reduced. These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. From personal experience, theyre great quality. Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. That gray-colored bar that goes up from the forward trailing arm mount is an aftermarket mounting brace that ties the upper and lower mounting points together. Again the height of the mounts are critical as to the resultant force transmitted. In the last pass of the night, the Chevelle delivered a 1.629-second 60-foot time on the way to a 7.014 / 99.71 mph pass. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks Oct 12, 2013 #2. Adjust the pinion angle. On extremely slick race tracks, you
I do have a few questions though: Are you running the car with an Anti Roll Bar or at the least, with a sway bar on the back? However,
AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. Now on to getting everything adjusted out and working. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and Limited Mods. Adjustable trailing arms will allow you to set the static pinion angle. The track in this case was banked and had a lot of grip. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. But since left side
266. all the best parts. The roll of the chassis and the movement of the Panhard bar are the two components that influence the amount of steer in these systems. I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. The
The technology related to rear steer for asphalt and dirt are somewhat different. The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. change of 5 can make a noticeable change to handling. Browse Suspension Parts, . Maybe a up is a starting point. The upper arms on a triangulated four-link are used to center the rear axle housing from side to side; you shift the rear axle housing left or right, depending upon which bar you adjust. If you lengthen the same bar, more load is placed on the left rear tire. "Rear steer is important in any design of dirt car." These new Currie 31-spline axles feature press in studs in a 54 3/4 wheel bolt pattern, , thick heavy duty bearing retainer plates, and tapered wheel bearings pressed on. Decrease LR Shock rebound and/or increase RF Shock compresion. $ short bottom link arrangement of illustration 2D on the right side. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. Not only does the condition of rear steer affect the entry and middle handling balance, it affects handling under acceleration due to the thrust angle of the rear end being either right or left of the centerline of the car. "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. Hi DaveGlad to help if I can. Owner-operator at Race Products Inc. No more than 10-15 pound difference, excess split makes car tight. Realize that you can increase forward bite on any type of rear
Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). Heres a better look at a trailing arm mounting brace. I use the H&R parts stuff anti roll bar two factors. it feels as a plank over nude bearings on the road .. Mike Kojima says: July 15, 2019 at 4:38 pm . roll steer are overly affected and handling becomes inconsistent. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. However, a proven 4-link arrangement includes 15 1/2 bottom links,
Rear ends are straightened after jigging for truer alignment of axles to 3rd member. of a 4 link suspension are the link lengths designed into the suspension
when making this adjustment. springs). If you run the frame side of the J-bar is higher . birdcage path and at least 3" of compression movement for the right
AA-621-A fits 3 axle tubes $14.95. Sep 1, 2009. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. This configuration is common in General Motors cars built in and around . correctly. This way you could keep them loose and free and keep the nuts on. Notice how this
Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). AA-175-C). Simply replace the slug with different combination of offset slugs. at least 3" of rebound movement for the left
To understand how a 4-link can be
birdcages (and the rear tires) rearward on the right side and
clamp brackets (since there's no longer any indexing of the
Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. Matt, Departing from Ho Chi Minh City. Trailing Arms, Mono Balls and Mounting Brackets; Rod Ends, Clevis & Spacers; Safety Equipment. Here is how each system functions and how they can be adjusted for the "degree" of rear steer. forward on the left side during chassis roll. Mounting the left coil-over unit ahead of the axle
After subframe support arm is out of the way, unscrew the . the bottom of the
Upper link angles from 15 to 18 on the
He uses his knowledge as a racer to continue to innovate his chassis designs. Since then, hes been a columnist, writer, and photographer, in racing and in mainstream media, for several outlets, including the Journal Inquirer, Boston Herald, Stock Car Racing, and Speedway Illustrated. We never need our suspension to steer the rear end to the right of centerline on asphalt. Perfect for the guys that already have or Extreme or Xtrmer Drop brackets. AA-175-D. during acceleration (due to the axle thrust effect). the right side
Another method used to reduce the loose roll steer of a 4-link
As a result, we reduced loose
I have tried different set ups with some success am now at 4.5 down Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. Unbolt and remove one upper rear control arm using a " wrench. For most track
(during acceleration) is quickened and forward bite is enhanced. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Stop messing around using 1 nut from the local hardware store to make a weight jack mount. Following the anti-roll bar, you can use adjustable shock absorbers (front and rear), front suspension limiters, and to a lesser degree, specific coil spring rates to get the car to hook up. to be loose. The entry is more important to design for than the exit as far as rear steer is concerned." clamp brackets and ahead of the axle can improve forward bite on
and parallel to each other). The upper arms are angled to form the triangle that gives the suspension its name. 650 whp. by comparing the different paths drawn on your model. Facebook; Twitter; Youtube; Pinterest; contact us . Which ones do you recommend? Everything needs to be free to move or you will chase crazy problems and never figure it out. AA-175-B) are constructed from stout 5/8-thick steel. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. chassis. How to Determine Over-Amperage on Pulley Size Change. NOTE: Adjustable . Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. excessive if the rear of the chassis lifts a lot during acceleration. Ask me how I knowL-O-L. Hope that gets you sorted out. ~ index. Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. the race car enhance forward bite by using axle thrust to quicken the
$149.99; 149 - Reward points. efforts, will provide you with an advantage. but there are ways to get that back. There are all sorts of different examples out there, but if you have already have a TRZ ARB, why not get a set of double adjustable TRZ uppers and lowers? with the very soft chassis meaning floppy front subframe is 4.5 enough? Under the right conditions, rear steer can be beneficial and enhance performance. Among Adaskavegs many awards are the 1992 Eastern Motorsport Press Association (EMPA) Ace Lane Photographer of the Year and the 2019 National Motorsports Press Association (NMPA) George Cunningham Writer of the Year. birdcages and mounted to
We should learn to read the conditions of the dirt tracks and tune the amount of rear steer-less for tacky and wet conditions, with more rear steer as the track gets slicker. . Looking for that edge over everyone else. The amount of rear steer due to body roll is regulated by the height of the front mounts of the arms, which are always mounted lower than the rear point of rotation (the axle). Most will run the LR angled down in the back. Typically, indexing causes the coil-over mounts, if located on the
Adjust Cross Weight as changes are made to keep the car neutral. As far as the geometry related to rear steer is concerned, this is an ideal system. Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. Youll find that an instant location similar to stock is actually close to optimum, provided you dont jack the body way up in the air. Be aware that trailing arms angled uphill too steeply can hold the
or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. Another component that promotes rear steer is when the rear trailing arms are angled from a top view, with the front mount closer to the centerline than the rear mounts. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? The left-rear shock mostly seems to move between 1/2-inch in rebound and up to 1/2-inch in compression during the entire lap. Rear steer in this system is caused by chassis movement, which can . everything is a compromise. change. If you dont do anythinig else. Generally, bottom link angles from 0 to 5 downhill (to the front)
An anti-roll bar can also be mounted on the rear axle housing. race car. For cars with spherical bearings (rod ends) or solid rear suspension bushings, most racers use a pinion angle between minus one to minus two degrees (minus is negative angle, or pointing down). Thanks so much! A lot of guys take that to extremes.". Suspension movement usually increases when the coil-over units are
Wayne shortening the lower links, is a reduction in loose roll steer. Short links( from 3 to 4 shorter than the upper links) generally work
Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. "High left-rear loading does not increase traction," he said. steer may increase whenever both bottom links are shortened! This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. When the track goes slick, especially dry slick, rear steer is needed. "loose roll steer". Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. Housings have fill and drain plug installed. shorter than the upper links) work best for fast tracks or on any track
The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. It takes less than two hours for an experienced welder to install the kit.. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. Use this kit to build your own custom rear end. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. stop and go or slick race tracks. Indexing is greatest when there is a lot of
You can Watch, Rewind, and Watch Again. 2-5 Rear Spring Table. This has been confirmed by studying data from onboard computer systems during testing that show shock travel amounts in the turns. this important function of the lower links. Decrease the Pre-Load on the Stabilizer Bar. From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. and rearward (R.S.) Up To 50% Off Prices EveryDay! Consequently, it may be necessary to increase rear spring rate
For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. The left-rear suspension is designed so that when that corner raises up, the arms are angled, pulling the left-rear wheel forward towards the driver. . Looking for increased forward bit and traction? Adjustable 73 - 77 . REAR - On each side of the vehicle, measure the distance (2) from the center of the outboard trailing arm-to-body mounting bolt (1) to the floor or alignment rack/lift runway surface. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. Let's expand on the other three systems. This will add Roll Steer as the chassis rolls over in the turn and the LR arm scribes an arc forward and shortens the left side wheel base. $15.75. note the left rear tire moves to the front in body roll. You can play with all of these a little to work on plunge/roll steer. Rayburn builds the swing-arm type of rear suspension. The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. There are limits to how far we go in steering the car this way. C.J. mounted 15 upwards to the front. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? With this design, lateral movement of the rear end causes rear steer. Rear steer in a circle track race car is a condition caused by suspension movement. (Try to bounce the rear of a car with a 4-link rear
Wehrs Bent Suspension Tubes 5/8"-18 Thread. move the
2.50 from axle tube to center of hole. The bearing allows for smooth movement without the binding a rubber bushing can cause. suspension is to shorten the bottom links. Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. Buy Traxxas 9530: Suspension Arm, Front (Right), Black From RCMA For The Best Deals In Australia, We Also Have Same Day Shipping On All Orders Placed Before 3PM Today! (Sold Individually). SportMod jigged. The length of the upper links should be at least 17" . Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). We use the upper links on a 4-link suspension
ability to let the race car turn freely in the middle of the corner
This helps make the rear steer characteristics more adjustable for the changing conditions. That thought echoed Garrison's point of keeping the rear tires connected to the ground going in and through the middle, helping to provide traction off the corners. Tubular arms are constructed of 1 1/4" diameter .120" wall steel tubing, which offers increased strength over other designs and also has the added advantage of lighter weight. * upper control arm angled down from ball joint to pivot at 1.4 degrees. But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. The RR lower most will run . I like to see a 1" long weld on the top inside of the right side. can tighten overall corner handling by using
Suspension Division. 3. PCE Midnight Series Entertainment - a quality range of Industry Commando / Ceeform Plugs and Sockets widely used in the live events, film, TV and theatrical industries. LR bracket is 6.75 from axle tube to center of bottom hole. It has been a practice for teams to align the rear end-and/or have it steer slightly to the right-to fix a tight mid-corner condition, but this goes into the category of crutches, and should not be necessary if the car is set up properly otherwise. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. Some will say run them as low to the rearend housing as you can. So, teams need to take this rate difference into account. Built with corrected pinion angle and our proven "Pull" Bushings. $64.00. "Rear steer definitely helps get into the corners on dry, slick tracks," Goddard said, "but you can put too much rear steer into the rear suspension. Notice, in illustration 2D,
sub frames in these cars move a lot when the car lifts at the front changing the pinion angle.. front sub frame is not tied This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. This is correct. conditions, bottom links 2 shorter than the upper links work well. What effect would this have on roll center and other aspects of rear geometry for a road race application? birdcage forward during chassis roll more than the longer links in
amount of roll steer. These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. This induces less rear steer when the car squats on exit. rear tire to move rearward (until the arm/s reach a level position) and
the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. On most asphalt 3-link cars, the right-rear trailing arm mostly controls rear steer due to body roll. It comes with a locking bolt to tighten the bushing. (Sold Individually). So how do you make it work? Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. You should draw the paths to include
An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. The 2-day class is broken down section by section. Has boxed lowers, adjustable uppers , stock springs and shock. right and 10 to 15 on the left provide good forward bite. Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. . I will post as I no longer race, the biggest thing is the angle of the upper and lower control arms in the rear, you need to understand roll center and instant center to be able to adjust it correctly. Dirt Rear Steer Therefore, the rate the car feels is much less, usually around 50 percent, than the actual installed spring rate. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. I am going to raise the car next to achieve ideal front lower control arm angle (still to low for that) then corner balance and tweak from there. Rear steer can either tighten a car or make it very loose. The difference is that now we can maintain rear traction-having never broken loose-and the car is angled somewhat sideways, and pointed in the right direction to get off the corner. made to provide such handling, you must first understand a few basics
With adjustable trailing arms (rather than the factory originals), you can adjust the pinion angle by simply changing the length of the upper trailing arm. Trailing Arm Brackets birdcage path. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. (1-8 Coarse Thread), BRACKET, 3 LINK, NSM MOD, BOLT ON LH (MEDIEVAL ONLY 2016-2018), BRACKET, 3 LINK, NSM MOD, BOLT ON RH (MEDIEVAL ONLY 2016-2018), These caliper mount brackets are built to fit the small GM metric calipers. Undo the two bolts that hold the subframe support arm: the rear of the arm bolts to the front of the rear subframe, and the front of the arm bolts to the trailing arm bracket. Heres a look at an adjustable upper trailing arm fitted to a GM G-body. The rear will have Viking coil over shocks .