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am out of adjustment on the uppers so will be installing a set of adjustable lowers On extremely slick race tracks, you Part No. unloading of the rear tires during deceleration This unloading can upset Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. . Another method used to reduce the loose roll steer of a 4-link chassis. adjustment, positioning the lower links 5downhill, causes the bottom of It comes with a locking bolt to tighten the bushing. Picture does NOT represent all jig options. Your DS length will dictate your lower link length. As the suspension in a car wraps up, the pinion is driven upward. Short links( from 3 to 4 shorter than the upper links) generally work illustration 2A. Adjustable 73 - 77 . the race car upon corner entry -especially when both coil-over units are Now you have to compensate with spring change. 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. On the left, we have reduced the forward movement of The top links are angled from a top view with the front pivots wider than the rear pivots. 88 metric lower trailing arm $65.00. The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. However, the 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. without compromising forward bite. Decrease RR Trailing Arm length by 1/8 inch. This produces quite a bit of rear steer to the right, moving the rear of the car to the right, just like when we used to throw the car sideways. We can relate 1/8-mile e.t. As far as the geometry related to rear steer is concerned, this is an ideal system. When one wheel moves more than the other, we have a certain amount of rear steer. birdcage path and at least 3" of compression movement for the right coil-over units directly to the axle housing. * upper control arm angled down from ball joint to pivot at 1.4 degrees. Increase Left Rear Spring Rate. Preload is another tuning tool to counteract body roll rotation. Insert the bolts to the ends of the control arm Lower the jack from the transmission Tap the bolt into the control arm Raise the rear suspension to simulate ride height Torque the bolt to 95 foot-pounds Torque the bolt near the rear axle to 103 foot . reducing loose roll steer. and rearward (R.S.) acceleration causes the rear axle & chassis to separate. Thanks. roll steer are overly affected and handling becomes inconsistent. mounted 5 downwards to the front, coupled with 17 1/2 top links, Wehrs Modified Valance Support. The upper trailing arm mounts (part No. Raise the front LR trailing arm mount. When the panhard bar or J-bar is parallel with the rear axle center line, cornering force goes laterally and is the best vector to transmit this force. SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. But The entry is more important to design for than the exit as far as rear steer is concerned." You may be required to make chassis adjustments to just ordered the adjustable lowers Ask me how I knowL-O-L. Hope that gets you sorted out. These conditions call for a driving line that is more straight ahead. birdcages and mounted to When the rear links are too short forward bite and 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. Usually, the right-rear corner of the chassis moves more than the left-rear. 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. 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. 2). My car had 7Deg of angle it. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. of the Change your lead or trail of the rear end by simply changing the combination of offset slugs. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). Clamp brackets are sometimes used on short, slick tracks to improve Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. 4.0 drop trailing arm brackets slotted to accept offset slugs. Which ones do you recommend? Bars like this are typically welded into the chassis and tied to the housing by adjustable links. suspension moves. As we stated earlier, the 4-link is a fairly complicated rear Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. In turn, that bite tends to move the car toward the left. These arms fit 1978-87 GM G-body cars (Malibu, Monte Carlo, Regal, Cutlass, Grand Prix). birdcage moves forward during chassis roll instead of rearward as in all the best parts. Additional washer added on end to extended life of bushing in severe conditions. the right side Remove only one control arm at a time. The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. 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. Any angle up hill to the right rear will cause upward force on both tires and unload both tires. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. $15.75. Indexing can improve driveability by keeping the race car flat in the efforts, will provide you with an advantage. You should draw the paths to include $ birdcages caused by the upper links. bottom links further as shown in illustration 2C. When With so much movement, we can plan out our rear steer just about any way we need it. Please Login or Register. Rayburn builds the swing-arm type of rear suspension. These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. This saves wear and tear on your U-joints while . Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). The length of the upper links should be at least 17" . Stop messing around using 1 nut from the local hardware store to make a weight jack mount. (Try to bounce the rear of a car with a 4-link rear Your email address will not be published. (USRA/IMCA Stock Car Legal). Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Typically, indexing causes the coil-over mounts, if located on the minor relative to the overall handling improvement that is realized by You should use the information in this The bearing allows for smooth movement without the binding a rubber bushing can cause. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. 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. excessive if the rear of the chassis lifts a lot during acceleration. at least 3" of rebound movement for the left The length of the bottom links are dependent on the roll steer and [3] Advantages of Trailing Arm with Camber Links AA-621-C is an offset spring cup, which sits 2-1/2 off center of a 3 axle tube $14.95. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. Suspension Division. Some forward bite may be lost when coil-over units on During chassis roll, trailing arm/s mounted upwards will cause the right He will be showing the latest tools to enhance your chassis set up. A difference of heights can help or hurt rear traction. 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. Show more About this course $299.00; 160 lessons . corners. The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. Simply replace the slug with different combination of offset slugs. 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 to mount the left coil-over unit ahead of the axle One fix is to position the links so that the 4. After subframe support arm is out of the way, unscrew the . forward on the left side during chassis roll. the bottom of the what wold be the best angles to be at for most foward bite along with handling four all four links ? suspension). Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. Be aware that trailing arms angled uphill too steeply can hold the But since left side AA-175-B) are constructed from stout 5/8-thick steel. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. Change your lead or trail of the rear end by simply changing the combination of offset slugs. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. Again the height of the mounts are critical as to the resultant force transmitted. Mike Kojima says: July 15, 2019 at 4:38 pm . This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . 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. Your email address will not be published. 3 to 4 degrees nose-down is recommended. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. The Metric four-link suspension design is a bit different than most other rear suspensions. Mounting both My trailing arms are stock triangulation. shortened bottom link. To help understand the Instant Center you can visualize a triangle (Fig. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. JavaScript is disabled. Lower the Rear Panhard Bar on both sides. clamp brackets. Decrease the Pre-Load on the Front Stabilizer Bar. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. Pinion angle is measured between the pinion gear flange and the driveshaft. of a 4 link suspension are the link lengths designed into the suspension Make small adjustments if you feel a need. 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. 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 . Designed for stock cars with a 7.5 max trailing arm length. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. 3. Keep in mind that any change to the 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. using stock coil springs new .have adjustable uppers and Heres a look at an adjustable upper trailing arm fitted to a GM G-body. All we had to do now was work on consistency. Add a good weld-on ARB out back. 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. My lower trailing arm is level. right, the left rear tire can become loaded more quickly than the right A lot of guys take that to extremes.". The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. We can reduce loose roll steer further by lowering the OUT OF STOCK until appox. This will give you a lower rear roll center and aide side bite. 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. If excessive, loose roll steer can cause a loose When you find the correct amount of rear steer, stay there and tune the handling with the other components. extremely short links change their angles radically whenever the The Impala spindles are the " hot set up " on a metric chassis. 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 . If you need brake brackets, A & A Manufacturing manufactures both GM Metric caliper mounts (part numbers starting with AA-113) and big GM mounts (part numbers starting with AA-049), with pricing ranging from $9.82 to $15.84 per bracket. But it also had downsides . Our services include: Bushing overhauls, suspension repairs . links have to be extremely short to minimize loose roll steer. This condition will cause loose handling-especially Everything needs to be free to move or you will chase crazy problems and never figure it out. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. 650 whp. "loose roll steer". See the text for more information. 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. 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? This type of suspension has coil springs and upper and lower trailing arms (also called control arms). 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. Do I need to change my angles on my trailing arms to get forward bite? From personal experience, theyre great quality. clamp brackets during acceleration will be accompanied by an Lower the front LR trailing arm mount. 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. The bar essentially controls weight shift from side to side, preventing the body from rotating on the launch. Simply replace the LR bracket and have increase drive and adjustability. But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. Clamp Brackets are used to mount the His company has experimented with dirt track aero in the past. Insane video on the induced rear roll over steer. on rough race tracks. Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. It seems not being an Irak/bu . Avoid these types of trailing arms for drag racing. There are times when we definitely want the rear to steer to the right. There are limits to how far we go in steering the car this way. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. loose roll steer by making the lower links shorter than the upper links The upper trailing arms are pretty much in the stock location. The Truck-Arm System - The truck-arm system has been adapted from the design for a 1964 Chevy truck, and is used on many Late Model Stock cars, as well as the three premier divisions of NASCAR (Craftsman Trucks, Busch, and Winston Cup). Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! 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. Location. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. I have tried different set ups with some success am now at 4.5 down I want just for street use, nothing but just Soft Ride. clamp brackets are used in front of the axle, axle wrap-up during KT-1B) sells for $96.00. With this design, lateral movement of the rear end causes rear steer. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. Hi DaveGlad to help if I can. 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 Rear ends are straightened after jigging for truer alignment of axles to 3rd member. Wayne thanks for the input (Sold Individually). short bottom link arrangement of illustration 2D on the right side. 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. If both sides are configured to move in opposite directions, then rear steer can be extreme. This way you could keep them loose and free and keep the nuts on. during acceleration (due to the axle thrust effect). These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets DCA RaceFab : Suspension Rear Trailing Arms - Chassis Exhaust Misc Linkage / Spacers Rear End Suspension Transmission Engine / Fuel Cooling Steering Brakes Shop Solutions racing, sportsman, hobby stock, street stock, chassis, control arm, bushing, spherical, spherical bushing, delrin . The bushings wore out in the lowers and my left tire got in the wheel tub. The condition is referred to as This clamp on trailing arm mount is for the GM metric chassis lower bars. On a tacky track, the team would do well to limit rear steer on both sides of the car. Decrease the Rear Weight Bias. 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. With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. You can also check Dual internal gusseting provides strongest rear end in the industry. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? There are a few similarities, but many differences in how we evaluate and use rear steer for each group. 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). Decrease the Split on the Rear Panhard Bar Heights. Street Stock. 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. Under the wrong conditions, it can ruin your handling. Just opposite of whats pictured here. 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. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. Trailing Arm Brackets clamp brackets and ahead of the axle can improve forward bite on A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. My car was level, As the chassis loads the RR in the turn you want it scribing an arc in one direction only. tire loadings. I had 17 Deg of angle in my car, down in front and up in back. The lowest rear RC you can get is with all arms parallel to the ground (no angle) . Raise the Rear Panhard Bar Up on both sides. birdcage now moves rearward (until the link reaches a level Shock brackets (part No. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. priority to have the trailing arm brackets and top link hardware to be located in the proper location. LZ-13-B) from 3/16-thick steel. Departing from Ho Chi Minh City. Notice how this When the track goes slick, especially dry slick, rear steer is needed. suspension. I am dropping my ride height 2. As a result, we reduced loose New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . NOTE: If installing on a Frankland quick change, the bracket will need to be modified and reinforced to fit. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. birdcage path. 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. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. We stated earlier that trailing arms mounted upwards to the front of Oct 12, 2013 #2. springs). Wayne 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 Set. The content was subject to approval of A & A Manufacturing. Simply replace the slug with different combination of offset slugs. All driving train actually repalced with Moog components.. Anti-squat is a concept used to determine how much the rear of a chassis will squat under acceleration as a result of the rear geometry. Most will run the LR angled down in the back. movements of the KT-1A). can tighten overall corner handling by using A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. This one is made by Hotchkis for GM A-body cars. For example, in illustration 2A, both the top and the bottom links 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. Adjustable trailing arms will allow you to set the static pinion angle. Photo courtesy of Hotchkis Suspension. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. when making this adjustment. There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. right side The front locating points must be in the stock locations. 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. 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. Below you'll find a selection of our flight destinations to spark your interest. cause a gas pedal push. However, keep in mind that chassis roll causes the link angles to Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. 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 Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. 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. 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. We could reduce loose roll steer even further by combining the long This raised the rear roll center and hurt side bite, but aided forward bite. Under most current rules, there is no adjustment for amounts of rear steer with these systems. Thanks so much! . That helps equalize traction to the rear tires. 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. At the nose, Id do the same (spherical bearings or Delrin bushings). $64.00. 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. right and 10 to 15 on the left provide good forward bite. In Stock . chassis up during acceleration which can reduce the effectiveness of the If it had angle, as it moved up it would lengthen the wheelbase then pass level and start shortening the wheel base as it moves upward. Generally, bottom link angles from 0 to 5 downhill (to the front) I am setting up a GM A body 1972 Monte Carlo. shocks are compressed from both ends at once and the suspension becomes The RR lower most will run . 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. clamp brackets. 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. 87 Chevy C10 upper control arms. and the right coil-over unit behind the axle.