Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. Just opposite of whats pictured here. Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. You are using an out of date browser. ability to let the race car turn freely in the middle of the corner
In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. This induces less rear steer when the car squats on exit. Suspension Type Camber Angle; FWD: Multilink Trailing Arm Twist Beam: 1.0 1.0 1.0 RWD: Multilink Trailing Arm Swing Arm: 1.0 1.0 1.3 AWD: Multilink Double Wishbone Trailing Arm: 1.0 1.0 1.0 4WD: Multilink Double Wishbone Trailing Arm: 0.5 0.5 0.5 This configuration is common in General Motors cars built in and around . In short
I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? Generally, bottom link angles from 0 to 5 downhill (to the front)
Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. On the left side, the bottom
The rear semi-trailing arm suspension is an independent rear suspension system similar to the pure trailing arm suspension, with the primary difference being that the bushing axis (or instant axis) runs at an angle in all X, Y, and Z directions. ance with altitude u p to the equilibrium line. 2-3 Starting Points for Bar Angles. The two most critical factors to the performance
You may be required to make chassis adjustments to
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. birdcages caused by the upper links. Built with corrected pinion angle and our proven "Pull" Bushings. On most asphalt 3-link cars, the right-rear trailing arm mostly controls rear steer due to body roll. Dave's Tip - "You should always tack weld them in place. 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. The front locating points must be in the stock locations. at least 3" of rebound movement for the left
We can reduce loose roll steer by lowering the bottom links at the
Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. The Z-link System Housings havefill and drain plug installed. I'm new at this how do u do that and does it makr a big difference. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. The popularity of the 4-link suspension is due primarily to its
Settle into your comfortable seat, enjoy sumptuous in-flight cuisine, stock up on last-minute duty-free items from the onboard store, and tune in to the in-flight entertainment system. Indexing can improve driveability by keeping the race car flat in the
These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. If the upper links are shorter than 17", the lower
made to provide such handling, you must first understand a few basics
Stronger is Better. These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. are used to help control loose steer. right amount of loose roll steer can help a race car to turn the corner
Increase the Split in the Panhard Bar Heights. Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. We've
You can Watch, Rewind, and Watch Again. Spring Motion Ratio Most often, the factory trailing arms are simply a stamped metal arm. Bushings in Upper Mounts As we stated earlier, the 4-link is a fairly complicated rear
Mounting the left coil-over unit ahead of the axle
AA-175-C). If the front is diving under braking then add anti-dive to front suspension. keep in mind the effect that indexing has on suspension stiffness. I had 17 Deg of angle in my car, down in front and up in back. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. 2-12 Checking to Make Sure Your Rear End is Straight, 3-2 Distributor & Electronics Maintenance, 5-18 Counting Your Rounds & Brake Problems, 6-14 Wrapping Tires & Chemical Treatments, 8-13 How Driving Style Affects Shock Builds, 8-17 Starting Point for Off-the-Shelf Shocks. Copyright Racelogic Chassis School 2023. Dave is the owner of Hammond Motorsports. When racing on dirt, watch the conditions and be prepared to make changes accordingly, not just to the setup, but also related to rear steer. The RR lower most will run . SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. To make it work, Id be inclined to either use spherical bearing upper and lower rear trailing (control) arms or at least a set with Delrin bushings. Decrease the Split on the Rear Panhard Bar Heights. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. This helps make the rear steer characteristics more adjustable for the changing conditions. We do not necessarily need to know the exact amounts of rear steer our cars are subjected to, but we do need to have a solid understanding of what produces rear steer and what effect rear steer has on the handling in our cars. Wehrs Modified Valance Support Weld On Clevis. Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. Notice, in illustration 2D,
2- 175-B upper mounts. it feels as a plank over nude bearings on the road .. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. and the right coil-over unit behind the axle. Trailing arms must also be running forward at the correct car builder design angle. 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. Maybe a up is a starting point. AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. What is wrong ? The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. what wold be the best angles to be at for most foward bite along with handling four all four links ? Matt, This was encouraging. No more than 10-15 pound difference, excess split makes car tight. When the rear links are too short forward bite and
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. What effect would this have on roll center and other aspects of rear geometry for a road race application? Made out of 1/2 thick steel to gain extra LR weight. Great info! They constantly introduce new products to their lineup. shocks are compressed from both ends at once and the suspension becomes
MAXIMUM Performance right side climbing panhard mount for quick change rear ends. illustration 2A. We can see the effect of the Sprint Car wing in the turns-as the cars actually roll left due to the pressure differential developed on the flat wing sides-as the cars go sideways at a high speed. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. . BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). loose roll steer. The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. Rear steer can either tighten a car or make it very loose. Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. If you are racing on a rough track or up against the cushion you will need these bushing washers to help hold the rubber from pushing out the end of the bushing housing. . traveled by the centers of the birdcages during chassis roll. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. the bottom links are lowered but the effect on forward bite is usually
I like to see a 1" long weld on the top inside of the right side. This has been confirmed by studying data from onboard computer systems during testing that show shock travel amounts in the turns. $15.75. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. shortening the lower links, is a reduction in loose roll steer. [3] Advantages of Trailing Arm with Camber Links the other illustrations. (Sold Individually). Unbolt and remove one upper rear control arm using a " wrench. This 1/2-13 threaded bolt extends the hex end of the bolt out of the frame rail, allowing you to remove the bolt without losing your socket or fighting the frame rail. However, the
here a simple Q as hope life for you: owning an base malibu sedan 81 and had changed coils (some, new and used), and new gabriel stock shocks, Im banging my head on the paviment as this car has absolute no suspension. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. . starting point for both links is 15 upwards (to the front). UMI part numbers are 4023CM-B or 4023CM-R. The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. $ 599.95. cause a gas pedal push. Compare the measurements to specifications. Reply. and rearward (R.S.) There can be a handling trade-off, however, to the forward traction
The length of the upper links should be at least 17" . very stiff. To help understand the Instant Center you can visualize a triangle (Fig. This way you could keep them loose and free and keep the nuts on. There can be a small amount of rear steer as the chassis rolls and squats, but it is both minimal and mostly fixed as far as adjustability. In turn, that bite tends to move the car toward the left. A difference of heights can help or hurt rear traction. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. * upper control arm angled down from ball joint to pivot at 1.4 degrees. So how do you make it work? Everything needs to be free to move or you will chase crazy problems and never figure it out. Photo courtesy of Hotchkis Suspension. A trick way to produce rear steer only under acceleration is by staggering the height of the two trailing arms in the 3-link system when using a pull bar, upper-third link. US $239.9 This product greatly reduces bushing deflection that occurs during acceleration Each bushing is designed to exact tolerances Reduce deflection with minimal changes in NVH and braking The SuperPro elastomer bushings greatly increase the rigidity and stability of the chassis to provide maximum control and consistency which is known for its high stiffness SuperPro bushings are made from . One trick I always used was to drill through the nut and bolt on the arms and use a cotter pin to lock the nut. If we mount the left-side trailing arm lower than the right-side trailing arm, then as the rear end rotates under acceleration due to the pull bar extending, the left-rear wheel will move rearward more so than the right-rear wheel, causing rear steer to the left to a small degree. Simply replace the LR bracket and have increase drive and adjustability. 3. OUT OF STOCK until appox. Bad shocks (and/or messed up valving) can be the culprit. Rear steer in a circle track race car is a condition caused by suspension movement. loose roll steer by making the lower links shorter than the upper links
But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. Adjust the length of the control arms as needed to achieve the desired pinion angle. Putting the stock "W" style suspension into a bind is your biggest enemy. KT-1B) sells for $96.00. Adjust Cross Weight as changes are made to keep the car neutral. article to determine the correct link lengths for your application. Keep in mind that any change to the
If the link angles become more upward on the left than on the
Mounting both
(Try to bounce the rear of a car with a 4-link rear
Sep 1, 2009. Adjustable trailing arms will allow you to set the static pinion angle. AA-621-C is an offset spring cup, which sits 2-1/2 off center of a 3 axle tube $14.95. In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. The rear axle
The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. See the text for more information. The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. A triangulated four-link puts the instant center (I/C) locationthe imaginary point of where the rear suspension components intersect, and the point theyrotate around in a given (instant) positionway out front, often close to the engine. Remove only one control arm at a time. Increase the Angle of the Upper Trailing Arm. Typically, indexing causes the coil-over mounts, if located on the
AA-621-B fits 2-5/8 ones $14.95. In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. Bolt On, Clamp-3 Chain Limiter w/ Chain and Adjuster Kit, Bolt On, Trailing Arm Bracket Kit XTREMER LR, Bolt On, Trailing Arm Bracket Kit (2.5 SINGLE HOLE), Bolt On, Trailing Arm Bracket Kit (2.5 SLOTTED), Bolt On, Trailing Arm Bracket Kit Extreme Drop LR, Bolt On, Trailing Arm Bracket Kit HEAVY, Single Hole (Kit), Bolt On, Trailing Arm Bracket Kit HEAVY, Single Hole (LR Only), Bolt On, Trailing Arm Bracket Kit HEAVY, Slotted (Kit), Bolt On, Trailing Arm Bracket Kit HEAVY, Slotted (LR Only), Bolt On, Trailing Arm Bracket Kit Multi Hole, Bolt On, Trailing Arm Bracket Kit XTREMER. (Steel). Some will say run them as low to the rearend housing as you can. Browse Suspension Parts, . Other teams may just stick with a fixed location for the mounts in the rear end and adjust handling with other means. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. If excessive, loose roll steer can cause a loose
As a result, the springs and
The length of the upper links should be at least 17" . I want just for street use, nothing but just Soft Ride. birdcage forward during chassis roll more than the longer links in
One of the reasons a car will test fast in practice, qualifying, and maybe the heat races, but then be out to lunch when the track changes come feature time, is a result of improper rear steer. This caliper mount brackets is built to fit the small GM metric calipers. Set. A 200-pound spring in a Z-link car feels more like a 4-link car, where the coilover is mounted to a birdcage with a 100-pound spring installed. Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. Use this kit to build your own custom rear end. "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. Lower the Rear Panhard Bar on both sides.