efforts, will provide you with an advantage. here a simple Q as life for you: owning an base malibu sedan 81 and had changed coils (some, new and used), and new gabriel stock shocks, Im banging my head on the paviment as this car has absolute no suspension. We use the upper links on a 4-link suspension We can reduce 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. (USRA/IMCA Stock Car Legal). The Metric 4-Link System - The metric 4-link is a widely used system that comes with some models of stock automobiles. PDF BMS Racecars - Winning's not just a goal it's a tradition! 2-5 Rear Spring Table. right side link is from 3 to 5 higher than the left when the chassis The live class took place January 22-23, 2022. loose roll steer by making the lower links shorter than the upper links excessive if the rear of the chassis lifts a lot during acceleration. The Ultimate Guide to Suspension and Handling: Part 9 It's - MotoIQ The adjuster is at the front of the bar. Bars like this are typically welded into the chassis and tied to the housing by adjustable links. . Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . Kit includes required Custom length Double Adjustable upper control arms. As a result, we reduced loose Copyright Racelogic Chassis School 2023. The length of the bottom links are dependent on the roll steer and move the and parallel to each other). 4. 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 . Pinion angle is measured between the pinion gear flange and the driveshaft. The Metric four-link suspension design is a bit different than most other rear suspensions. Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. . Unbolt and remove one upper rear control arm using a " wrench. change. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. Jul 23, 2001. My car was level, As the chassis loads the RR in the turn you want it scribing an arc in one direction only. 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. One disadvantage is pointed out by Masters. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. Short links( from 3 to 4 shorter than the upper links) generally work The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. There can be a handling trade-off, however, to the forward traction Browse Suspension Parts, . An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. shorter than the upper links) work best for fast tracks or on any track You should use the information in this However, keep in mind that chassis roll causes the link angles to position) instead of forward as in illustrations 2A and 2B. ance with altitude u p to the equilibrium line. The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. 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 upper arms are angled to form the triangle that gives the suspension its name. Then, a 1" weld on the bottom inside of the left side." 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. The Impala spindles are the " hot set up " on a metric chassis. Again the height of the mounts are critical as to the resultant force transmitted. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Speedway Stamped GM Metric Upper Rear Control Arm Trailing arms mounted in this manner cause the rear tires to 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. These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. Not sure if there are any big "Tricks". 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 . GM Metric Trailing Arm Mounts - Lower - Hammond Motorsports "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. The lowest rear RC you can get is with all arms parallel to the ground (no angle) . Spring Motion Ratio Dave here in Saskatoon been racing a g body for many years now and struggle to get All driving train actually repalced with Moog components.. These arms also use rod ends on each end to prevent binding when under load. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. For most track Therefore, the rate the car feels is much less, usually around 50 percent, than the actual installed spring rate. Click here to remove banner ads from this forum. traction characteristics desired by the chassis tuner. The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. 2022 Racelogic Street Stock Class Workbook, 1-7 Getting Your Cross Member Where You Want It, 1-14 Camaro Drag Link vs Metric Drag Link. I had 17 Deg of angle in my car, down in front and up in back. Please Login or Register. 4.0 drop trailing arm brackets slotted to accept offset slugs. Matt, I am getting ready to change my lowers out to some better ones that are adjustable. 2-4 Offset Bushings and Trailing Arms. birdcage rotates or "indexes" on the axle tube whenever the The front locating points must be in the stock locations. designing and tuning a 4 link is to understand the significance of these Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. We can reduce loose roll steer by making the lower links shorter than the upper links (more on this later). Just opposite of whats pictured here. They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. Finally, Im not exactly sure what you mean by a floppy front subframe. 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. For example, in illustration 2A, both the top and the bottom links 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. birdcage forward during chassis roll more than the longer links in The rear semi-trailing arm suspension is an independent rear suspension system similar to the pure trailing arm suspension, with the primary difference being that the bushing axis (or instant axis) runs at an angle in all X, Y, and Z directions. We highly recommend that you build a full-scale working model of your The problem with some trailing arms made for Mustangs and GMs A- and G-bodies is they tend to create a very short (further from the engine) instant center by changing the angle of the bars. With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. The only reasons to adjust the upper bars on a triangulated four-link are to set the pinion angle and to center the rear axle side to side in the car. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. mounted 15 upwards to the front. These conditions call for a driving line that is more straight ahead. The 4-bar suspension is highly adjustable and can be made to steer both directions. Semi trailing arm suspension explained - YouTube Upper link angles from 15 to 18 on the 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. Trailing arms must also be running forward at the correct car builder design angle. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. You can also check suspension. The Do Tubular Trailing Arms Make a Big Improvement? - QA1 birdcage path. How To: Install Rear Trailing Arm Bushings Without Removing Knuckles Stop messing around using 1 nut from the local hardware store to make a weight jack mount. 2- 175-C bushing for upper mounts. On a tacky track, the team would do well to limit rear steer on both sides of the car. We've roll steer. So, teams need to take this rate difference into account. You should keep in mind that any loading of the rear tires caused by The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. The RR lower most will run . Wayne 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. Some will say run them as low to the rearend housing as you can. Top 8 GM G-Body Suspension Tips - Aldan American the bottom of the bottom links further as shown in illustration 2C. Rear Lower Control Arms : Lower Rear Control Arms : Trailing Arms Metric rear trailing arm mts?? - 4m.net A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. 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. The side bite trade off is a big one. A racer himself, he was the winner of the Street Stock Nationals in 2019. two factors. With so much movement, we can plan out our rear steer just about any way we need it. Suspension & Alignment Specs: 2007-2010 Dodge Caliber - Brake & Front End Adjust the length of the control arms as needed to achieve the desired pinion angle. In turn, that bite tends to move the car toward the left. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. I have edelbrock adjustable uppers with non adjustable boxed lowers. gained by running the trailing arms upward to the front of the race car. UMI part numbers are 4023CM-B or 4023CM-R. (Sold Individually). Facebook; Twitter; Youtube; Pinterest; contact us . You can use cardboard, Dirt Rear Steer Decrease LR Shock rebound and/or increase RF Shock compresion. AA-621-A fits 3 axle tubes $14.95. These systems only steer to the left and have a limited amount of steer. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). 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). As far as the geometry related to rear steer is concerned, this is an ideal system. Sep 1, 2009. Consequently, a further reduction in loose roll steer results. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. Fox80. Description. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. Also, how old are the shocks and have you ever had the valving checked? You can counteract this force by preloading the suspension. This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. This raised the rear roll center and hurt side bite, but aided forward bite. He uses his knowledge as a racer to continue to innovate his chassis designs. Now on to getting everything adjusted out and working. Adjustable arms allow easy rear suspension . The condition is referred to as The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). Decrease the Split on the Rear Panhard Bar Heights. can tighten overall corner handling by using (Steel). 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 . 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. 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. 9-5 Upper A-Arm Mounting Points Metric. Usually, the right-rear corner of the chassis moves more than the left-rear. These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. Dave's Tip - "You should always tack weld them in place. is at ride height. PDF SQUARING A R C - Longacre Racing Wehrs Bent Suspension Tubes 5/8"-18 Thread. When designing or We can have too much weight end up on the left-rear tire and lose traction and/or cause the car to push off the corners because of all of the forward thrust is concentrated in the left-rear tire. Indexing can improve driveability by keeping the race car flat in the In this case, that equates to a 10.80. 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. Raise the Rear Panhard Bar Up on both sides. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. There are times when we definitely want the rear to steer to the right. 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. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. Metric Rear suspension tricks | The Dirt Forum - ProBoards chassis up during acceleration which can reduce the effectiveness of the These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets But it also had downsides . The upper arms is where many very in opinion. Wehrs Metric Trailing Arm Bolt. the left rear tire to move forward. Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. Trailing Arm Brackets the right side There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. 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. . I'm not sure of the Task Force width . As we stated earlier, the 4-link is a fairly complicated rear Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. 2. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. $64.00. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. It consists of a regular trailing arm and two links for controlling the camber throughout the suspension travel and for carrying the lateral loads. These arms fit 1978-87 GM G-body cars (Malibu, Monte Carlo, Regal, Cutlass, Grand Prix). all the best parts. Lower the Rear Panhard Bar on both sides. reducing loose roll steer. This induces less rear steer when the car squats on exit. If you lengthen the same bar, more load is placed on the left rear tire. Chassis Setup - Rear Steer Design - MotorTrend A smooth entry provides a faster exit. Metric Four-Link Suspension Design - Circle Track Magazine - MotorTrend You can see how this adjustment works in illustration 2B. are used to help control loose steer. A difference of heights can help or hurt rear traction. Suspension Parts, Front & Rear parts . This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. 6. 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 4-link is a relatively complex rear suspension that is very This condition will cause loose handling-especially These tips are for an independent a-arm front suspension and 3-link rear suspension type of car, but may apply to other types of suspensions as well. Under most current rules, there is no adjustment for amounts of rear steer with these systems. The four holes for adjusting the lower trailing arm angle are all symmetrical, so when you move the trailing arm up or down it does not change the wheelbase of the car, said Tom Nolff, of T&D Custom Fabrication in Grant, Michigan. race car. Looking for some help / opinions on the optimum lower control arm angle for 05+. Simply replace the LR bracket and have increase drive and adjustability. Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. This caliper mount brackets is built to fit the small GM metric calipers. The idea is to trace the paths actually stop and go or slick race tracks. 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. Has boxed lowers, adjustable uppers , stock springs and shock. Among Adaskavegs many awards are the 1992 Eastern Motorsport Press Association (EMPA) Ace Lane Photographer of the Year and the 2019 National Motorsports Press Association (NMPA) George Cunningham Writer of the Year. Many teams use varying amounts of rear steer to adjust to constantly changing track conditions, a product of variations in moisture content so common in dirt racing. My trailing arms are stock triangulation. The lower links are angled from a top view with the front pivots narrower than the rear pivots. His company has experimented with dirt track aero in the past. These are BMR upper trailing arms for 1979-2001 Mustangs. Asphalt Rear Steer Do I need to change my angles on my trailing arms to get forward bite? I am setting up a GM A body 1972 Monte Carlo. Add a good weld-on ARB out back. * upper control arm angled down from ball joint to pivot at 1.4 degrees. The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. Clamp Brackets are used to mount the Any of you guys changed any angles on trailing arms etc on a metric to make it faster? 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! Followed your advice and got a set of adjustable lowers. This was encouraging. movements of the 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant tire loadings. chassis. birdcage now moves rearward (until the link reaches a level This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . We can reduce loose roll steer by lowering the bottom links at the rear trailing arm mounts frame repair The stock trailing arm mounting kit (part No. But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. Use this kit to build your own custom rear end. 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. Show more About this course $299.00; 160 lessons . Chassis / Suspension / Cables Parts for VW Bug 1946-1979 As a result, the springs and very stiff. I am going to raise the car next to achieve ideal front lower control arm angle (still to low for that) then corner balance and tweak from there. Location. 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 Adjust the pinion angle. 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. A good You may be required to make chassis adjustments to you will speed up your learning process by working with a model. Tune For The Leave: Drag Suspension Tweaks For A 10-Second Chevelle [3] Advantages of Trailing Arm with Camber Links Notice how this It uses four links, as the name implies, that are not parallel to the centerline of the 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). This will give you a lower rear roll center and aide side bite. 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). Decrease the Angle of the Upper Trailing Arm. Decrease the Pre-Load on the Front Stabilizer Bar. handling condition that negates the benefits of the forward bite gained 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. 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. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks No more than 10-15 pound difference, excess split makes car tight. Wehrs Body Bolt Panel Inserts. July 1st. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. You should pay close 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. On extremely slick race tracks, you ance with altitude u p to the equilibrium line. rear tire to move rearward (until the arm/s reach a level position) and suspension). . Tuning With Rear Steer Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. Dartmouth, Nova Scotia. Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. right side Welcome to J-AUTO! 3. It comes with a locking bolt to tighten the bushing. Adjustable trailing arms will allow you to set the static pinion angle. birdcage moves forward during chassis roll instead of rearward as in Perfect for the guys that already have or Extreme or Xtrmer Drop brackets. This type of suspension has coil springs and upper and lower trailing arms (also called control arms). Suspension Measurements - Quick Performance Long bottom links (equal in length or no more than 1 To see if rear steer is an important tuning tool, we turned to some experts. On cars with triangulated upper control arms, you cant set preload with adjustable arms. Has a 1/4 hole on bottom to allow bolting to your weight jack bolt.