My car had 7Deg of angle it. After subframe support arm is out of the way, unscrew the . Your email address will not be published. 3 to 4 degrees nose-down is recommended. In turn, that bite tends to move the car toward the left. But Rayburn builds the swing-arm type of rear suspension. The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. See all 6 photos. Decrease RR Trailing Arm length by 1/8 inch. Has boxed lowers, adjustable uppers , stock springs and shock. In Stock . starting point for both links is 15 upwards (to the front). Excess loading of either the left- or right-rear tires decreases traction in most cases. roll steer. Where did I run mine? Change your lead or trail of the rear end by simply changing the combination of offset slugs. This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. 4. 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. Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. bottom link arrangement of illustration 2C on the left side and the I am dropping my ride height 2. That way, the car will stay as fast and balanced as it can be throughout all of the changing conditions. Below you'll find a selection of our flight destinations to spark your interest. but there are ways to get that back. In simple terms, it keeps the body from roll rotating on the launch. Part No. unloading of the rear tires during deceleration This unloading can upset There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. As a result, we reduced loose So how do you make it work? Use this kit to build your own custom rear end. birdcage moves forward during chassis roll instead of rearward as in Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. The 4-link is a relatively complex rear suspension that is very Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. But it also had downsides . Required fields are marked *. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. ability to let the race car turn freely in the middle of the corner If excessive, loose roll steer can cause a loose Location. This action will cause The trailing arm side will be rusty and wont remove easily, I had to unscrew mine with a 3' breaker bar! My upper a arm is at a 10 degree angle pointing down towards the front. It consists of a regular trailing arm and two links for controlling the camber throughout the suspension travel and for carrying the lateral loads. have qa1 adjustable coil over shocks without the coil have a tube welded across the frame at the back to mount the shocks like a ladder bar note the left rear tire moves to the front in body roll. Wehrs Bent Suspension Tubes 5/8"-18 Thread. Truth!^^^^^. Ground clearance at bump and uptravel at ride height will dictate link angle. 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 . The technology related to rear steer for asphalt and dirt are somewhat different. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. We've (Sold Individually). Oct 12, 2013 #2. keep in mind the effect that indexing has on suspension stiffness. The live class took place January 22-23, 2022. Wayne The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). To really add over steer at the rear end housing you can mount the front pivot point of the RR trailing arm towards the center of the car. Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. A difference of heights can help or hurt rear traction. Compare the measurements to specifications. 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? A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. His company has experimented with dirt track aero in the past. Your DS length will dictate your lower link length. However, a proven 4-link arrangement includes 15 1/2 bottom links, Show more About this course $299.00; 160 lessons . efforts, will provide you with an advantage. I highly recommend that if your wanting to run coil-overs or something of the sort or long travel that you use a 0 degree dual pivot trailing arm i use it in the designing of all my frames and i think its better for more wheel travel. Spring Motion Ratio Wehrs Body Braces. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). Also pinion angle with stock bushings. coil-over units on birdcages, to rotate against the shocks and springs during RAceman. Now available value added Metric Rear Control Arm . Bars like this are typically welded into the chassis and tied to the housing by adjustable links. link lengths and angles and how the relationship affects roll steer and to be loose. Clamp Brackets are used to mount the That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. Heres a look at an adjustable upper trailing arm fitted to a GM G-body. 122. You may be required to make chassis adjustments to two factors. The bottom of the left side 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. 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. Increase the Angle of the Upper Trailing Arm. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . We highly recommend that you build a full-scale working model of your We could reduce loose roll steer even further by combining the long Please Login or Register. Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 If you lengthen the same bar, more load is placed on the left rear tire. . path traveled by any trailing arm will affect roll steer. The length of the upper links should be at least 17" . To understand how a 4-link can be $ 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. Shock brackets (part No. Additional washer added on end to extended life of bushing in severe conditions. Dave here in Saskatoon been racing a g body for many years now and struggle to get Sep 1, 2009. Adjustable arms allow easy rear suspension . 4-link, or use the design parameters mentioned in this article, to help This condition will cause loose handling-especially In this case, that equates to a 10.80. Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). Welcome to J-AUTO! The condition is referred to as Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. Departing from Ho Chi Minh City. The advantage of this system is that it keeps the rear end squared up and the thrust under acceleration straight ahead, if that is what is needed. 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. Part No. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction 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). AA-175-D. Avoid these types of trailing arms for drag racing. The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. 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. birdcages move up during chassis roll, the overall effect, when See the text for more information. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. These conditions call for a driving line that is more straight ahead. This type of suspension has coil springs and upper and lower trailing arms (also called control arms). during acceleration (due to the axle thrust effect). 87 Chevy C10 upper control arms. Most will run the LR angled down in the back. Order your Trailing Arm 2 Piece Set - today at 1AAuto.com. Cf: a c t i v i t . Keep in mind that trailing arm angles can become Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. Increase Left Rear Spring Rate. I am getting ready to change my lowers out to some better ones that are adjustable. . The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . One fix is to position the links so that the Wehrs Modular Non-Adjustable T-Bar. Dirt Track Aero As a result, the loading of the rear tires Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. It may not display this or other websites correctly. forward(L.S.) This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. 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. With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. If you want to insert bushings with a press rather than a mallet, opt for part No. birdcages and mounted to Trailing arms mounted in this manner cause the rear tires to (USRA/IMCA Stock Car Legal). If both sides are configured to move in opposite directions, then rear steer can be extreme. You should pay close 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. the other illustrations. wood, aluminum strips, etc. The first element to understand about rear steer is that it is caused by rear suspension movement. Those conditions rarely exist on dirt. These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. Change your lead or trail of the rear end by simply changing the combination of offset slugs. 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. There are a few similarities, but many differences in how we evaluate and use rear steer for each group. These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets : ; 300 euro energiepauschale; rear trailing arm mounts frame repair He uses his knowledge as a racer to continue to innovate his chassis designs. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . front of the The Impala spindles are the " hot set up " on a metric chassis. Set. The idea is to trace the paths actually Stop messing around using 1 nut from the local hardware store to make a weight jack mount. These arms also use rod ends on each end to prevent binding when under load. 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. I am setting up a GM A body 1972 Monte Carlo. A 4-link This is your problem, (sprung v. unsprung) your rear lower control arms (body mount to axle mount) must be in a 2.0-3.0 degrees (max) downward slope to the rear axle. To help understand the Instant Center you can visualize a triangle (Fig. The entry is more important to design for than the exit as far as rear steer is concerned." They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. With so much movement, we can plan out our rear steer just about any way we need it. AA-621-A fits 3 axle tubes $14.95. Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. illustration 2B where the links are level. What is wrong ? Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. 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. 1 diameter x 11 long weight jack bolt. Dual internal gusseting provides strongest rear end in the industry. 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. But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. They constantly introduce new products to their lineup. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. We can reduce loose roll steer by making the lower links shorter than the upper links (more on this later). (during acceleration) is quickened and forward bite is enhanced. The RR lower most will run level. roll steer are overly affected and handling becomes inconsistent. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. A lot of guys take that to extremes.". He will be showing the latest tools to enhance your chassis set up. Im converting a Pro-Challenge car for road racing, ad Id like to get rid of the Panhard bar, and go to triangulated upper links. Now you have to compensate with spring change. On the left, we have reduced the forward movement of Browse Suspension Parts, . 2- 175-B upper mounts. The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". How to Determine Over-Amperage on Pulley Size Change. of the 6. On extremely dry, slick conditions, use lots of rear steer to the right. #2. pat the angle of the trailing arm wont really effect anything that much. 9-5 Upper A-Arm Mounting Points Metric. 2-5 Rear Spring Table. As the rear corners of the car move, along with the controlling arms that locate the rear-end fore and aft, each side can move the wheel on that side forward or to the rear. The upper trailing arms are pretty much in the stock location. Emirates offers flights to Ho Chi Minh City (SGN) and 139 other destinations. or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. right, the left rear tire can become loaded more quickly than the right made to provide such handling, you must first understand a few basics Simply replace the LR bracket and have increase drive and adjustability. The difference is, Id like to use the center post where the three link top link currently attaches to the chassis, and go out to brackets at the ends of the rear axle. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. 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. The variation of height for the right-rear trailing arm is very small. Indexing can improve driveability by keeping the race car flat in the forward on the left side during chassis roll. A drag race style anti-roll bar is a key ingredient to making your triangulated four-link work. Great info! shortening the lower links, is a reduction in loose roll steer. 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. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. Street Stock. If the link angles become more upward on the left than on the Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). KT-1A). 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. 4. All driving train actually repalced with Moog components.. On extremely slick race tracks, you As the left side of the car travels up, the front of both of the trailing arms are angled upwards so that the left-rear tire tries to drive up under the chassis, loading the left-rear tire considerably. Jul 23, 2001. They are: 1. Now on to getting everything adjusted out and working. best for tight, flat race tracks or on any track where the chassis tends 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. suspension moves. Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. Description. * upper control arm angled down from ball joint to pivot at 1.4 degrees. Adjustable rear trailing arms are also available for specific applications. 2,224. Jigged with our: Clamp brackets are sometimes used on short, slick tracks to improve Decrease LR Shock rebound and/or increase RF Shock compresion. I also have a trz weld in style arb. birdcage. However, the article to determine the correct link lengths for your application. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). The key to correctly This configuration is common in General Motors cars built in and around . Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. For a better experience, please enable JavaScript in your browser before proceeding. Adjust the length of the control arms as needed to achieve the desired pinion angle. Adjust the pinion angle. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. (USRA/IMCA Stock Car Legal). Skip to main content. You should draw the paths to include how the shortened bottom link pulls the bottom of the right side and the angles to which the links are adjusted. Raise the front LR trailing arm mount. AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. short bottom link arrangement of illustration 2D on the right side. My lower trailing arm is level. stop and go or slick race tracks. "loose roll steer". loading of the rear tires. I'm not sure of the Task Force width . AA-621-B fits 2-5/8 ones $14.95. Under the wrong conditions, it can ruin your handling. Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. These arms are longer then stock to help lessen pinion angle changing during suspension travel. if the left rear of your chassis hikes up during cornering, loose roll 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. This one is made by Hotchkis for GM A-body cars. 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? 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. - Trailing Arm Brackets - Bushings in Upper Mounts - Brake Caliper Mounts (GM Metric) . try to drive underneath the chassis as the rear axle pushes the race car race car. can tighten overall corner handling by using change of 5 can make a noticeable change to handling. initial forward bite. Adjustable 73 - 77 . Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. where the chassis tends to push. Made out of 1/2 thick steel to gain extra LR weight. the right side That helps equalize traction to the rear tires. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. Up To 50% Off Prices EveryDay! The top links are angled from a top view with the front pivots wider than the rear pivots. This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. During chassis roll, trailing arm/s mounted upwards will cause the right The track in this case was banked and had a lot of grip. birdcage now moves rearward (until the link reaches a level West Coast Metric - Suspension Parts, Front & Rear. 3. Usually, the right-rear corner of the chassis moves more than the left-rear. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. UMI part numbers are 4023CM-B or 4023CM-R. Fox80. the bottom of the the 60 in the low 50s have 505hp 350 460fpt car weight 3400 what is your take on the pinion angle? $15.75. A downside to using the truck arms is not related to steering characteristics, but due to a narrow spring base when the springs are mounted directly on top of the truck arms, creating a narrow spring base in the rear. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. My rear end is a nine inch ford with the large pinion. One disadvantage is pointed out by Masters. 88 metric lower trailing arm $65.00. Thanks . Trailing Arm Brackets When the rear links are too short forward bite and 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. Putting the stock "W" style suspension into a bind is your biggest enemy. 2. The length of the upper links should be at least 17" . Dave is the owner of Hammond Motorsports. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. This will give you a lower rear roll center and aide side bite. The front may be too stiff compared to the rear. forward (See illustration 1). The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. Photo courtesy of Hotchkis Suspension. This is caused by the rear end swinging around the instant center, created from projecting lines through the arms to the front until the lines meet. Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. Soft springs, a left chassis-mounted track bar, and easy-up shocks on the left side all promote the body roll that produces rear steer to the right. If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. Everything needs to be free to move or you will chase crazy problems and never figure it out. Most often, the factory trailing arms are simply a stamped metal arm. Upper link angles from 15 to 18 on the I have a blown 71 Chevelle. attention to how the lower link adjustments change the paths traveled by Under most current rules, there is no adjustment for amounts of rear steer with these systems. Increase the Split in the Panhard Bar Heights. Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". Other teams may just stick with a fixed location for the mounts in the rear end and adjust handling with other means. 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. You are using an out of date browser. For most track The setup is balanced when the LF and LR tire temps are similar. I have edelbrock adjustable uppers with non adjustable boxed lowers. 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. The stock trailing arm mounting kit (part No. KT-1B) sells for $96.00. However, The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. Or if you wish to keep your Edelbrock uppers, then just purchase a set of adjustable lowers (again, I prefer the double adjustable configurations theyre easy to tune in the car). 1-15 How Important is it to Bump the Left Front? The Designed for stock cars with a 7.5 max trailing arm length. Rear steer in this system is caused by chassis movement, which can . 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. I like to see a 1" long weld on the top inside of the right side. Which ones do you recommend? 3. Custom Part is Non-Returnable and Non-Refundable. SportMod jigged. traction characteristics desired by the chassis tuner. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . 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. The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . These systems only steer to the left and have a limited amount of steer. . 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. wenee9w Pit Crew. and parallel to each other). Wehrs Metric Trailing Arm Bolt. clamp brackets. 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 hope the information in this article, combined with your C.J. to enhance the forward bite. On a tacky track, the team would do well to limit rear steer on both sides of the car. Insane video on the induced rear roll over steer. Tack weld the slugs to secure them to the trailing arm. 2.50 from axle tube to center of hole. The Z-link System Some will say run them as low to the rearend housing as you can.
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