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2.5 drop trailing arm brackets slotted to accept 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. When to be loose. In order to keep the driveshaft and U-joints operating in a (more or less) straight line when youre on the throttle, the pinion angle has to be correct. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. Mike Kojima says: July 15, 2019 at 4:38 pm . 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. These arms also use rod ends on each end to prevent binding when under load. Up To 50% Off Prices EveryDay! birdcage now moves rearward (until the link reaches a level Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. 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. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. 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. If the link angles become more upward on the left than on the 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. The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. 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). The upper arms is where many very in opinion. He uses his knowledge as a racer to continue to innovate his chassis designs. If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) just ordered the adjustable lowers currently using 4.5 down and it picked up 60. Street Stock. : ; 300 euro energiepauschale; rear trailing arm mounts frame repair The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. The adjuster is at the front of the bar. You can play with all of these a little to work on plunge/roll steer. I'm not sure of the Task Force width . 2- 175-B upper mounts. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. In Stock . Remove only one control arm at a time. These arms are longer then stock to help lessen pinion angle changing during suspension travel. Then this trailing arm bracket kit is a must have. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. The key to correctly A well designed 4-link provides good forward bite and the proper 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. clamp brackets. Reply. The length of the upper links should be at least 17" . 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. 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. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. birdcage moves forward during chassis roll instead of rearward as in illustration 2B where the links are level. Clamp brackets are sometimes used on short, slick tracks to improve AA-175-D. 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. NOTE: If installing on a Frankland quick change, the bracket will need to be modified and reinforced to fit. #2. pat the angle of the trailing arm wont really effect anything that much. Shock 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. during acceleration (due to the axle thrust effect). Masters added, "Any time we can press air against the sides of the car, we can help the car to turn." This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. As we stated earlier, the 4-link is a fairly complicated rear This was encouraging. Under most current rules, there is no adjustment for amounts of rear steer with these systems. 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. One of the things we have done, is to raise the rear ride height. gained by running the trailing arms upward to the front of the race car. How Much is Too Much? However, birdcages, to rotate against the shocks and springs during You can see how this adjustment works in illustration 2B. AA-175-B) are constructed from stout 5/8-thick steel. birdcages during chassis roll. 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. Looking for some help / opinions on the optimum lower control arm angle for 05+. Adjustable trailing arms will allow you to set the static pinion angle. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. loose roll steer by making the lower links shorter than the upper links 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. On asphalt, do not make large changes to components that influence rear steer. article to determine the correct link lengths for your application. Add to cart Details. The reason rear steer aero might be important comes on dry, slick surfaces, where the tires do not grip well. You can also check If you dont do anythinig else. On cars with triangulated upper control arms, you cant set preload with adjustable arms. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. 1 diameter x 11 long weight jack bolt. Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. note the left rear tire moves to the front in body roll. "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. Please Login or Register. clamp brackets. 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. 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. suspension. The two most critical factors to the performance right and 10 to 15 on the left provide good forward bite. Skip to main content. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). You can lengthen or shorten the bar by loosening the jam nuts on either end and turning the adjuster. Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. Great info! New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. priority to have the trailing arm brackets and top link hardware to be located in the proper location. A difference of heights can help or hurt rear traction. Looking for that edge over everyone else. reducing loose roll steer. rear tire to move rearward (until the arm/s reach a level position) and 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. This one is made by Hotchkis for GM A-body cars. Loose roll steer causes the rear axle to steer towards the outside of efforts, will provide you with an advantage. When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. the race track. 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). On most flat- to medium-banked tracks, the left-rear moves very little. (Try to bounce the rear of a car with a 4-link rear Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. (Sold Individually). Where did I run mine? . The company offers a wide array of quality chassis components at reasonable prices. birdcage does lose some of its rearward movement because of the This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . However, a proven 4-link arrangement includes 15 1/2 bottom links, The Metric 4-Link System - The metric 4-link is a widely used system that comes with some models of stock automobiles. (Steel). 1/2" on RF (5 degree angle of Upper A-Frame mounting bolts), 1/4" on LF, front higher than back, average bolt height the same as before. You can Watch, Rewind, and Watch Again. As a result, we reduced loose "High left-rear loading does not increase traction," he said. On the left, we have reduced the forward movement of 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. July 1st. I was looking for more info on stock rear 4 link trailing arm angles. Trailing arms must also be running forward at the correct car builder design angle. Description. Mounting both on rough race tracks. 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. My upper a arm is at a 10 degree angle pointing down towards the front. Required fields are marked *. At best, any trailing arm arrangement is a compromise between 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. Also, how old are the shocks and have you ever had the valving checked? A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. I had 17 Deg of angle in my car, down in front and up in back. wenee9w Pit Crew. Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. Followed your advice and got a set of adjustable lowers. Decrease the Pre-Load on the Stabilizer Bar. My rear end is a nine inch ford with the large pinion. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. 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. Big Chevy Impala and Caprice 1980 to 1994 casting number is 369056 for right side and 396055 for left side and if you can not locate these I can send you info on other substitutes. 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. Copyright Racelogic Chassis School 2023. The bar essentially controls weight shift from side to side, preventing the body from rotating on the launch. Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). Built with corrected pinion angle and our proven "Pull" Bushings. However, indexing can cause the rear suspension to be too harsh BMS Racecars - Winning's not just a goal it's a tradition! Lower the Rear Panhard Bar on both sides. 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. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). 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. The Metric four-link suspension design is a bit different than most other rear suspensions. These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. 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. Has boxed lowers, adjustable uppers , stock springs and shock. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! length and/or angle difference in the upper and lower links. This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. His company has experimented with dirt track aero in the past. These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. The A & A Manufacturing stock trailing arm mounting kit (part No. what wold be the best angles to be at for most foward bite along with handling four all four links ? Owner-operator at Race Products Inc. 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. No more than 10-15 pound difference, excess split makes car tight. If you lengthen the same bar, more load is placed on the left rear tire. If both sides are configured to move in opposite directions, then rear steer can be extreme. Just opposite of whats pictured here. These are BMR upper trailing arms for 1979-2001 Mustangs. Typically, indexing causes the coil-over mounts, if located on the Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. birdcage forward during chassis roll more than the longer links in Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. RAceman. 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 trailing arm side will be rusty and wont remove easily, I had to unscrew mine with a 3' breaker bar! 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. Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. Click here to remove banner ads from this forum. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. correct any corner entry handling problems caused by Rear Spring Cups from A&A Holidays Wish List, Shellhammer Dirt Track: 10 Races in Less Than 3 Hours, Tucker Clark: Racing Helps Teen with Autism, Bob and Sandy Garby: Super Fans Recognized, Hayden Cardwell: iRacing Champ to Real-Life Racing Champ, Outside Groove Racing Show a Hit; 24 Date Set, Hayden Ross Motorsports Foundation Started, Michael Lutz: Not the Results Hes Looking For, Lincoln Speedway: Thursday & Sunday Do Well. Be aware that trailing arms angled uphill too steeply can hold the 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. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. You can use cardboard, To see if rear steer is an important tuning tool, we turned to some experts. Part No. Decrease RR Trailing Arm length by 1/8 inch. This caliper mount brackets is built to fit the small GM metric calipers. Compare the measurements to specifications. During chassis roll, indexing loads the right rear tire and unloads The Setup with Shane Tesch Topic - Center Pull #shorttrackracing #metalfabricator #latemodelstockcar #metalfabrication #chassisfab #stockcar #metalfab #motorsports #portcityracecars #superlatemodel #chassis #racecar #asphaltracing #pavementracing #racingparts correctly. Phone (07) 31033011 Between - 9:30am - 4:30pm. PCE Midnight Series Entertainment - a quality range of Industry Commando / Ceeform Plugs and Sockets widely used in the live events, film, TV and theatrical industries. Welcome to J-AUTO! All we had to do now was work on consistency. the bottom links are lowered but the effect on forward bite is usually 2-5 Rear Spring Table. In the last pass of the night, the Chevelle delivered a 1.629-second 60-foot time on the way to a 7.014 / 99.71 mph pass. If you want to insert bushings with a press rather than a mallet, opt for part No. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. (Sold as a Pair) . KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. (more on this later). minor relative to the overall handling improvement that is realized by As far as the geometry related to rear steer is concerned, this is an ideal system. 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. 650 whp. Decrease the Pre-Load on the Front Stabilizer Bar. are used to help control loose steer. SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. 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. Raise the front LR trailing arm mount. This type of suspension has coil springs and upper and lower trailing arms (also called control arms). Part No. When one wheel moves more than the other, we have a certain amount of rear steer. 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? Finally, Im not exactly sure what you mean by a floppy front subframe. But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. When you find the correct amount of rear steer, stay there and tune the handling with the other components. 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. "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison.