metric chassis trailing arm angles

I want just for street use, nothing but just Soft Ride. tire loadings. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). but there are ways to get that back. Balance the Front and Rear stiffness. It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? A difference of heights can help or hurt rear traction. 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. Wehrs Body Braces. The problem with some trailing arms made for Mustangs and GMs A- and G-bodies is they tend to create a very short (further from the engine) instant center by changing the angle of the bars. Use this kit to build your own custom rear end. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. Street Stock. * upper control arm angled down from ball joint to pivot at 1.4 degrees. sensitive to adjustments. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. 6. Masters added, "Any time we can press air against the sides of the car, we can help the car to turn." See the text for more information. Hes authored five how-to books and written over 4,500 tech articles that have appeared in sixty different high performance automotive, motorcycle and aviation magazines worldwide. you will speed up your learning process by working with a model. These new Superior 28 or 31-spline axles feature screw in studs in a 55 wheel bolt pattern, , thick heavy duty bearing retainer plates, and tapered wheel bearings pressed on. REAR SUSPENSION: The following is a general list of rear ends and their dimensions to help narrow the search for a possible candidate to replace the torque tube rear end or just get a better set of gears for highway driving. reducing loose roll steer. 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. The idea is to trace the paths actually Under the wrong conditions, it can ruin your handling. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. Thanks so much! Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! Decrease the Rear Weight Bias. OUT OF STOCK until appox. This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. Dave's Tip - "You should always tack weld them in place. Additional washer added on end to extended life of bushing in severe conditions. with the very soft chassis meaning floppy front subframe is 4.5 enough? The company also sells ultra-lightweight rear . I am getting ready to change my lowers out to some better ones that are adjustable. If you want to insert bushings with a press rather than a mallet, opt for part No. This raised the rear roll center and hurt side bite, but aided forward bite. $ Adjustable arms allow easy rear suspension . Change your lead or trail of the rear end by simply changing the combination of offset slugs. Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. Also has a anti roll bar added to it. When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. Just as bad, some of the top-mount arms (ones that physically raise the upper trailing arm location on the rear end housing) have a tendency to hammer the trunk floor when you get on the throttle. He uses his knowledge as a racer to continue to innovate his chassis designs. birdcage now moves rearward (until the link reaches a level Part No. As far as the geometry related to rear steer is concerned, this is an ideal system. 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. . 1-15 How Important is it to Bump the Left Front? Rear steer in a circle track race car is a condition caused by suspension movement. short bottom link arrangement of illustration 2D on the right side. If the upper links are shorter than 17", the lower 4. . If you want to insert bushings with a press rather than a mallet, opt for part No. The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. AA-621-A fits 3 axle tubes $14.95. 88 metric lower trailing arm $65.00. Adjustable trailing arms will allow you to set the static pinion angle. about rear suspensions. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. The length of the bottom links are dependent on the roll steer and 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 LATE MODEL SUSPENSION FRONT-REAR; LATE MODEL DRIVELINE-WHEELS; . Decrease Upper Control Arm Angle on the Rearend. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. currently using 4.5 down and it picked up 60. AA-175-D. Realize that you can increase forward bite on any type of rear bottom links further as shown in illustration 2C. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. : ; 300 euro energiepauschale; rear trailing arm mounts frame repair loose roll steer tendency caused by the steep angles of the upper links. to be loose. In short Richards added that today, the Z-link or swing-arm suspension can have nearly as much rear steer as the 4-link, without the excessive loading of the left-rear tire. link lengths and angles and how the relationship affects roll steer and AA-621-B fits 2-5/8 ones $14.95. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. There can be a handling trade-off, however, to the forward traction Trailing Arms, Mono Balls and Mounting Brackets; Rod Ends, Clevis & Spacers; Safety Equipment. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. You are using an out of date browser. Cf: a c t i v i t . In a car with a non-triangulated four link, you can shorten the upper right trailing arm to increase the preload on the right rear tire. A 1/2 inch height change from level can make significant handling changes. We usually need to position the angle of the trailing arm so that the front mount is higher than the rear mount by roughly one third of the distance that the front mount will move down during cornering. Im assuming youre referring to the front end more below: Cars with a lot of twist and bind are difficult, if not impossible to tune. Order your Trailing Arm 2 Piece Set - today at 1AAuto.com. 3 to 4 degrees nose-down is recommended. Skip to main content. here a simple Q as 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. Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. tuning a 4-link, it is important to understand the relationship between AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. Rear ends are straightened after jigging for truer alignment of axles to 3rd member. They constantly introduce new products to their lineup. Then this NEW trailing arm bracket kit is a must have. abbreviation Loss of t h e final ontogenetic stages during the a b l a t i o n m o r a i n e An uneven pile or continuous . conditions, bottom links 2 shorter than the upper links work well. Also pinion angle with stock bushings. The system works well enough on the street, but not so well when it comes to hooking up at the drag strip, especially with big horsepower. birdcage forward during chassis roll more than the longer links in right amount of loose roll steer can help a race car to turn the corner 650 whp. how the shortened bottom link pulls the bottom of the right side The Asphalt 3-Link - The 3-link rear suspension system has two trailing arms mounted near the rear tires, and one third link mounted atop the rear differential that controls rear end wrap-up. Mounting the left coil-over unit ahead of the axle You can evaluate the roll steer characteristics of different set-ups The significance of this, for the purpose of this article, is that the chassis travel in a Z-link is enhanced compared to the 4-link suspension when using the same installed spring rate, and this causes quite a bit of chassis travel and related rear steer. cause a gas pedal push. 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? Tack weld the slugs to secure them to the trailing arm. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). The setup is balanced when the LF and LR tire temps are similar. 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. The 4-link is a relatively complex rear suspension that is very It comes with a locking bolt to tighten the bushing. On a tacky track, the team would do well to limit rear steer on both sides of the car. the race car enhance forward bite by using axle thrust to quicken the Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. 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. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. Now on to getting everything adjusted out and working. This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. If you lengthen the same bar, more load is placed on the left rear tire. move the We also talked with Sandy Goddard of Warrior Race Cars and he said his group of racers work with rear steer less than some other dirt teams, although he feels that using a degree of rear steer is very important at times. LR bracket is 6.75 from axle tube to center of bottom hole. Obviously, if both of the wheels did not move, or moved in the same direction by the same amount, we would have zero rear steer. If the link angles become more upward on the left than on the Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. In a high horsepower car, engine torque tends to rotate the car so the right rear tire has more bite. If you look at a modern dirt Late Model, the sides are made up of big, flat panels similar to the sides of a Sprint Car wing. Adjust the pinion angle. Increase Left Rear Spring Rate. "Rear steer is important in any design of dirt car." This configuration is common in General Motors cars built in and around . Made out of 1/2 thick steel to gain extra LR weight. The upper arms are angled to form the triangle that gives the suspension its name. From personal experience, theyre great quality. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. AA-175-B) are constructed from stout 5/8-thick steel. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. We never need our suspension to steer the rear end to the right of centerline on asphalt. SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. A smooth entry provides a faster exit. Preload is another tuning tool to counteract body roll rotation. excessive if the rear of the chassis lifts a lot during acceleration. or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension.This type of suspension has coil springs and upper and lower trailing arms (also called control arms).The upper arms are angled to form the triangle that gives the suspension its name. Notice how this Knowing these basics, we need to look at each type of racing to see how rear steer affects each type of car and how we might improve our performance using rear steer. Copyright Racelogic Chassis School 2023. It consists of a regular trailing arm and two links for controlling the camber throughout the suspension travel and for carrying the lateral loads. Use this kit to build your own custom rear end. path traveled by any trailing arm will affect roll steer. AA-175-D. $15.75. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. You can use cardboard, It takes less than two hours for an experienced welder to install the kit.. $64.00. suspension moves (unless both upper and lower links are equal in length Jul 23, 2001. The entry is more important to design for than the exit as far as rear steer is concerned." "We have always wanted rear steer," he said. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. 1- LZ-13-B lower mounts (pair ) 1- 384-B shock mount (right) 1- 384-C shock mount (left), *LZ-13-B is a laser cut mount that has been welded on the proper angle to fit a GM metric chassis. Make small adjustments if you feel a need. During chassis roll, trailing arm/s mounted upwards will cause the right In more recent years, teams have been setting up the car so that the left side raises up quite a bit. * puts the roll center 3.3 inches off the ground. (Sold Individually). The company manufactures the kits lower trailing arm mounts (part No. Trailing Arm Brackets Part No. Get your shocks addressed (tested by someone with a shock dyno who knows what theyre doing) and then go back and work on the pinion angle, using the guidelines from the article. bottom link arrangement of illustration 2C on the left side and the change of 5 can make a noticeable change to handling. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. wood, aluminum strips, etc. How Much is Too Much? For most track ability to let the race car turn freely in the middle of the corner 266. Most often, the factory trailing arms are simply a stamped metal arm. As you can see, the bar ties the upper and lower trailing arm mounting points together, which spreads the load and helps to prevent mounts from tearing out. Decrease the Angle of the Upper Trailing Arm. are used to help control loose steer. The adjuster is at the front of the bar. suspension by angling the trailing arms upward toward the front of the birdcages, to rotate against the shocks and springs during Loose roll steer causes the rear axle to steer towards the outside of This trailing arm bracket use common offset slugs (sold separately) to allow you to change the amount of lead or trail in the rear end. The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. Since we cannot lump them together, we will analyze them separately. The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. We use the upper links on a 4-link suspension As the rear end rocks back under acceleration the angle in the arms are trying to lift the chassis in front and therefore pushes down on the rearend housing in the back. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. With the trailing arms toed in at the front you can use the J-Bar mounting angle to help steer the rear end through roll. Tuning With Rear Steer Adjustable 73 - 77 . to enhance the forward bite. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. 2.50 from axle tube to center of hole. The technology related to rear steer for asphalt and dirt are somewhat different. Wehrs Bent Suspension Bar Angle Finder. As a result, we reduced loose Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. Fox80. steer may increase whenever both bottom links are shortened! Change your lead or trail of the rear end by simply changing the combination of offset slugs. Welcome Guest. 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. is at ride height. Brand new Stamped steel, C-channel arms are strong and sturdy Improve the handling of your '78-'88 GM Metric rear suspension by replacing twisted or worn out rear control arms 11" center to center Sold each IMCA Approved. The layout, lengths, and angles of the upper A-Arm work together with Lower Control Arm to encompass what engineers refer to as an Instant Center. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. The stock trailing arm mounting kit (part No. A rear end that is steered to the right of centerline causes the thrust angle to be pointed to the right of centerline and makes the car loose on entry and loose on exit under acceleration. The Standard 4-Bar System This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. Decrease RR Trailing Arm length by 1/8 inch. The track in this case was banked and had a lot of grip. race car. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. I like to see a 1" long weld on the top inside of the right side. Dirt Track Aero Simply replace the LR bracket and have increase drive and adjustability. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. Trailing arms must also be running forward at the correct car builder design angle. Decrease LR Shock rebound and/or increase RF Shock compresion. designing and tuning a 4 link is to understand the significance of these Under most current rules, there is no adjustment for amounts of rear steer with these systems. Wayne Sep 1, 2009. Ask me how I knowL-O-L. Hope that gets you sorted out. To see if rear steer is an important tuning tool, we turned to some experts. Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. The variation of height for the right-rear trailing arm is very small. Can I convert a combustion engine car to a hybrid car? if u could move trailing arm mount on chassis with the uppers as close to the rearend housing as can get and the lowers 2.5 away from housing. Below you'll find a selection of our flight destinations to spark your interest. Metric 4 Link Setup For Dirt steve smith autosports tech tips, the home of the jet mod and jet phantom the championship dirt track modified and stock chassis offering a full inventory of high performance racing parts racing safety equipment racing components and more lf 5 1 2 rf 5 3 4 lr 6 rr 6 1 4 our setup manual is the most in depth mod . . Compared to the 4-bar cars, it has more limited adjustment for rear steer and historically has worked well on the tighter and more highly banked race tracks because the rear end is pointed more straight ahead. However, the made to provide such handling, you must first understand a few basics forward(L.S.) 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. 4.0 from axle tube to center of hole. After subframe support arm is out of the way, unscrew the . There are limits to how far we go in steering the car this way. . For a better experience, please enable JavaScript in your browser before proceeding. the race track. Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. Unbolt and remove one upper rear control arm using a " wrench. Suspension Parts, Front & Rear parts . chassis up during acceleration which can reduce the effectiveness of the 1 diameter x 11 long weight jack bolt. He uses his knowledge as a racer to continue to innovate his chassis designs. This will give you a lower rear roll center and aide side bite. Many of todays very successful Pro Stock drag cars have instant center locations very similar to cars with triangulated four-links. And have fun at SIR! Wehrs Body Bolt Panel Inserts. loading of the rear tires. If you dont do anythinig else. We could reduce loose roll steer even further by combining the long positioned ahead of the axle and attached to The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. (Sold Individually). Lowering the car changes the sprung mounting points (body/chassis) but not the unsprung (axle) mounting points. This condition will cause loose handling-especially You should use the information in this As a result, loose roll steer is reduced. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. Keep in mind that trailing arm angles can become 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 lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. Wehrs Metric Trailing Arm Bolt. (Steel). shortened bottom link. The length of the upper links should be at least 17" . Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. Justin is the owner of High Roller Race Cars. It comes with a locking bolt to tighten the bushing. shortening the lower links, is a reduction in loose roll steer. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). As we stated earlier, the 4-link is a fairly complicated rear I am setting up a GM A body 1972 Monte Carlo. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. That helps equalize traction to the rear tires. Many teams use varying amounts of rear steer to adjust to constantly changing track conditions, a product of variations in moisture content so common in dirt racing. If you run the frame side of the J-bar is higher . clamp brackets to mount the left coil-over unit ahead of the axle the left rear tire to move forward. Add a good weld-on ARB out back. Housings havefill and drain plug installed. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. (during acceleration) is quickened and forward bite is enhanced. (and tire) are forced towards the race track. Dirt Rear Steer Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". Can be used on both 9" Ford and quick change rear end tubes. correctly. A rear end steered to the left of centerline will cause the thrust angle to be left of centerline and make the car tighter on entry and tighter on exit under acceleration. clamp brackets are used in front of the axle, axle wrap-up during 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. NOTE: If installing on a Frankland quick change, the bracket will need to be modified and reinforced to fit. birdcages (and the rear tires) rearward on the right side and We highly recommend that you build a full-scale working model of your links have to be extremely short to minimize loose roll steer. Let's expand on the other three systems. at least 3" of rebound movement for the left This will make it easier to line up the new control arms when they are installed. Rear steer in this system is caused by chassis movement, which can . Bad shocks (and/or messed up valving) can be the culprit. birdcage. (See illustration 2A.). the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). See all 6 photos. birdcages caused by the upper links. I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Notice, in illustration 2D, The two most critical factors to the performance PEM 9" Grand National Limited Floater Rear End Housing, RE-SSM-5800 is a 58" housing with a 0 pinion angle, stock mounts, and GM Metric caliper mounts. KT-1A ). . This action will cause Reply.