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Your email address will not be published. 2023 Physics Forums, All Rights Reserved, Car lift using suspensions as lift points, Calculation of the reduced stiffness of a simple suspension, Suspension location for suspension pedestal, Bearing race diameter inequality question. the right side 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. The Metric four-link suspension design is a bit different than most other rear suspensions. 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. Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. birdcage. Perfect for the guys that already have or Extreme or Xtrmer Drop brackets. Decrease Upper Control Arm Angle on the Rearend. 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. It comes with a locking bolt to tighten the bushing. 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. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. 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. Looking for increased forward bit and traction? traveled by the centers of the birdcages during chassis roll. Departing from Ho Chi Minh City. If the link angles become more upward on the left than on the 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. two factors. suspension. As the suspension in a car wraps up, the pinion is driven upward. On asphalt, do not make large changes to components that influence rear steer. Consequently, it may be necessary to increase rear spring rate There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks Facebook; Twitter; Youtube; Pinterest; contact us . It comes with a locking bolt to tighten the bushing. 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. During chassis roll, trailing arm/s mounted upwards will cause the right $64.00. The two most critical factors to the performance Looking for some help / opinions on the optimum lower control arm angle for 05+. forward (See illustration 1). 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. bottom links further as shown in illustration 2C. But it also had downsides . 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. An anti-roll bar can also be mounted on the rear axle housing. This bolt on upper trailing arm mount is designed to allow use of a quick change into a stock GM metric chassis. movements of the Mike Kojima says: July 15, 2019 at 4:38 pm . In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. extremely short links change their angles radically whenever the Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. of the 3. That helps equalize traction to the rear tires. Change your lead or trail of the rear end by simply changing the combination of offset slugs. Required fields are marked *. These arms also use rod ends on each end to prevent binding when under load. the race car upon corner entry -especially when both coil-over units are 2. ~ index. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. Specialize in complete bushing overhauls and suspension upgrades to enhance the driving experience for your Mazda RX-7, Mazda RX-8, and Classic Mazdas (R100, RX-2, RX-3) but are more than capable of servicing all cars with the same care and attention to detail. birdcages and mounted to Stop messing around using 1 nut from the local hardware store to make a weight jack mount. He will be showing the latest tools to enhance your chassis set up. However, indexing can cause the rear suspension to be too harsh All we had to do now was work on consistency. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". Wehrs Bent Suspension Tubes 5/8"-18 Thread. Your DS length will dictate your lower link length. When using trailing arm angles to help your setup it pays to truly understand the movements at each section of the corner as well as think about any drawbacks that rear steer or understeer might create. Location. Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. Lower the front LR trailing arm mount. After subframe support arm is out of the way, unscrew the . Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. link lengths and angles and how the relationship affects roll steer and The roll of the chassis and the movement of the Panhard bar are the two components that influence the amount of steer in these systems. 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. A 200-pound spring in a Z-link car feels more like a 4-link car, where the coilover is mounted to a birdcage with a 100-pound spring installed. These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets The bar essentially controls weight shift from side to side, preventing the body from rotating on the launch. bottom link arrangement of illustration 2C on the left side and the You should draw the paths to include by comparing the different paths drawn on your model. Excess loading of either the left- or right-rear tires decreases traction in most cases. note the left rear tire moves to the front in body roll. 2,224. Trailing arm bushings come included (part No. LATE MODEL SUSPENSION FRONT-REAR; LATE MODEL DRIVELINE-WHEELS; . This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. NOTE: If installing on a Frankland quick change, the bracket will need to be modified and reinforced to fit. (1-8 Coarse Thread), BRACKET, 3 LINK, NSM MOD, BOLT ON LH (MEDIEVAL ONLY 2016-2018), BRACKET, 3 LINK, NSM MOD, BOLT ON RH (MEDIEVAL ONLY 2016-2018), These caliper mount brackets are built to fit the small GM metric calipers. AA-621-A fits 3 axle tubes $14.95. We never need our suspension to steer the rear end to the right of centerline on asphalt. Great info! You should keep in mind that any loading of the rear tires caused by it feels as a plank over nude bearings on the road .. 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 raised the rear roll center and hurt side bite, but aided forward bite. Copyright Racelogic Chassis School 2023. Your email address will not be published. right and 10 to 15 on the left provide good forward bite. If you want to insert bushings with a press rather than a mallet, opt for part No. (Sold Individually). AA-175-B) are constructed from stout 5/8-thick steel. best for tight, flat race tracks or on any track where the chassis tends 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. Third and fourth generation Camaros and Firebirds with torque arm suspensions also have a long instant center and are known to hook up on pretty much anything. That way, the car will stay as fast and balanced as it can be throughout all of the changing conditions. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. Most often, the factory trailing arms are simply a stamped metal arm. 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. shortening the lower links, is a reduction in loose roll steer. 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. to -mile numbers by multiplying by 1.54. Please Login or Register. Some will say run them as low to the rearend housing as you can. about rear suspensions. clamp brackets and ahead of the axle can improve forward bite on acceleration causes the rear axle & chassis to separate. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . Dave's Tip - "You should always tack weld them in place. It takes less than two hours for an experienced welder to install the kit.. The entry is more important to design for than the exit as far as rear steer is concerned." suspension). Indexing can improve driveability by keeping the race car flat in the Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction If the upper links are shorter than 17", the lower To understand how a 4-link can be Up To 50% Off Prices EveryDay! the left rear tire to move forward. The 4-link is a relatively complex rear suspension that is very Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. 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. This will make it easier to line up the new control arms when they are installed. Tack weld the slugs to secure them to the trailing arm. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. clamp brackets. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. shortened bottom link. Spring Motion Ratio Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . Adjust Cross Weight as changes are made to keep the car neutral. Stronger is Better. Dirt Track Aero 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. at least 3" of rebound movement for the left move the When the track goes slick, especially dry slick, rear steer is needed. Make small adjustments if you feel a need. Tuning With Rear Steer Custom Part is Non-Returnable and Non-Refundable. You can evaluate the roll steer characteristics of different set-ups attention to how the lower link adjustments change the paths traveled by 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 bearing allows for smooth movement without the binding a rubber bushing can cause. This helps make the rear steer characteristics more adjustable for the changing conditions. 3. Mounting both 2-3 Starting Points for Bar Angles. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). The upper trailing arms are pretty much in the stock location. For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. roll steer are overly affected and handling becomes inconsistent. Unbolt and remove one upper rear control arm using a " wrench. You can also check clamp brackets. very stiff. Maybe a up is a starting point. Where did I run mine? Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. 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 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 a Late Model, this air pressure difference may help keep the car on the track by virtue of having the car go through the air at an angle, causing both a high pressure on the leading (right) side and a lower pressure on the trailing (left) side. The condition is referred to as With stock brackets on . They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. 122. right side link is from 3 to 5 higher than the left when the chassis What effect would this have on roll center and other aspects of rear geometry for a road race application? article to determine the correct link lengths for your application. Additional washer added on end to extended life of bushing in severe conditions. Adjust the length of the control arms as needed to achieve the desired pinion angle. correctly. Click here to remove banner ads from this forum. and the angles to which the links are adjusted. Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. However, the Some forward bite may be lost when 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 These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. suspension bump (compression) movement. There are limits to how far we go in steering the car this way. efforts, will provide you with an advantage. The lower links are angled from a top view with the front pivots narrower than the rear pivots. links have to be extremely short to minimize loose roll steer. Kit contains: (2) Rear upper control . Following the anti-roll bar, you can use adjustable shock absorbers (front and rear), front suspension limiters, and to a lesser degree, specific coil spring rates to get the car to hook up. is at ride height. 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. The RR lower most will run level. The RR lower most will run . I use the H&R parts stuff anti roll bar 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. We could reduce loose roll steer even further by combining the long Undo the two bolts that hold the subframe support arm: the rear of the arm bolts to the front of the rear subframe, and the front of the arm bolts to the trailing arm bracket. Suspension movement usually increases when the coil-over units are Then, a 1" weld on the bottom inside of the left side." The The technology related to rear steer for asphalt and dirt are somewhat different. The following examples and illustrations should help you to understand Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! No more than 10-15 pound difference, excess split makes car tight. Wehrs Modular Non-Adjustable T-Bar. Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. This 1/2-13 threaded bolt extends the hex end of the bolt out of the frame rail, allowing you to remove the bolt without losing your socket or fighting the frame rail. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. currently using 4.5 down and it picked up 60. This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. 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 . The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. And have fun at SIR! Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. We can use the lower links of a 4-link suspension to help offset the You can Watch, Rewind, and Watch Again. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. handling condition that negates the benefits of the forward bite gained Rayburn builds the swing-arm type of rear suspension. Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. 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. 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. As a result, loose roll steer is reduced. 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. Bad shocks (and/or messed up valving) can be the culprit. It may not display this or other websites correctly. all the best parts. It seems not being an Irak/bu . Dave here in Saskatoon been racing a g body for many years now and struggle to get These trailing arm brackets use common offset slugs (sold separately) to allow you to change the amount of lead or trail in the rear end. 88 metric lower trailing arm $65.00. clamp brackets are used in front of the axle, axle wrap-up during the bottom of the Part No. right amount of loose roll steer can help a race car to turn the corner Suspension Division. Tack weld the slugs to secure them to the trailing arm. tire loadings. Another method used to reduce the loose roll steer of a 4-link Add to cart Details. [3] Advantages of Trailing Arm with Camber Links Buy Traxxas 9530: Suspension Arm, Front (Right), Black From RCMA For The Best Deals In Australia, We Also Have Same Day Shipping On All Orders Placed Before 3PM Today! 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. The company also sells ultra-lightweight rear . This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. The content was subject to approval of A & A Manufacturing. with the very soft chassis meaning floppy front subframe is 4.5 enough? In more recent years, teams have been setting up the car so that the left side raises up quite a bit. the race track. Simply replace the slug with different combination of offset slugs. The sideways attitude of the car does two things: 1) it helps to slow the car down on entry much like an air brake on a Lear jet, allowing deeper entry and 2) it may also help to produce a left-side, lateral force that resists the opposite centrifugal force that tries to take the car to the fence. The car was set up and driven more like an asphalt car and it was fast. The front locating points must be in the stock locations. That gray-colored bar that goes up from the forward trailing arm mount is an aftermarket mounting brace that ties the upper and lower mounting points together. 9-5 Upper A-Arm Mounting Points Metric. My rear end is a nine inch ford with the large pinion. roll 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. 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? The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . Hi DaveGlad to help if I can. "We have always wanted rear steer," he said. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. . MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Trailing arms mounted in this manner cause the rear tires to birdcage moves forward during chassis roll instead of rearward as in 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. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . This saves wear and tear on your U-joints while . Housings have fill and drain plug installed. When selecting springs for your 4-link, you should A well designed 4-link provides good forward bite and the proper Wayne Shock brackets (part No. Decrease the Pre-Load on the Front Stabilizer Bar. The Setup with Shane Tesch Topic - Center Pull #shorttrackracing #metalfabricator #latemodelstockcar #metalfabrication #chassisfab #stockcar #metalfab #motorsports #portcityracecars #superlatemodel #chassis #racecar #asphaltracing #pavementracing #racingparts Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). front of the The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. Performance Disc Brake . That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. This configuration is common in General Motors cars built in and around . Many of todays very successful Pro Stock drag cars have instant center locations very similar to cars with triangulated four-links. The track in this case was banked and had a lot of grip. you will speed up your learning process by working with a model. Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". Mounting the left coil-over unit ahead of the axle Wayne 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. by running the trailing arms upward towards the front. suspension moves (unless both upper and lower links are equal in length Those conditions rarely exist on dirt. The front may be too stiff compared to the rear. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. Since we cannot lump them together, we will analyze them separately. Can I convert a combustion engine car to a hybrid car? Clamp brackets are sometimes used on short, slick tracks to improve 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. lowered the bottom links to a level position and now the bottom of the As a result, the loading of the rear tires "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. Also, how old are the shocks and have you ever had the valving checked? The upper arms is where many very in opinion. Jul 23, 2001. One fix is to position the links so that the As we stated earlier, the 4-link is a fairly complicated rear 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 .