Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. right, the left rear tire can become loaded more quickly than the right Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. The live class took place January 22-23, 2022. They constantly introduce new products to their lineup. Typically, indexing causes the coil-over mounts, if located on the A lot of guys take that to extremes.". $15.75. 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. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. On asphalt, do not make large changes to components that influence rear steer. A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. 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 . It seems not being an Irak/bu . When selecting springs for your 4-link, you should Oct 12, 2013 #2. "We have always wanted rear steer," he said. This condition may very stiff. on rough race tracks. by running the trailing arms upward towards the front. Now available value added Metric Rear Control Arm . links have to be extremely short to minimize loose roll steer. roll steer are overly affected and handling becomes inconsistent. 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. 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. conditions, bottom links 2 shorter than the upper links work well. 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. short bottom link arrangement of illustration 2D on the right side. move the (during acceleration) is quickened and forward bite is enhanced. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? . 266. As a result, the springs and Has boxed lowers, adjustable uppers , stock springs and shock. If the front is diving under braking then add anti-dive to front suspension. . the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). This induces less rear steer when the car squats on exit. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. The condition is referred to as SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. My trailing arms are stock triangulation. (Try to bounce the rear of a car with a 4-link rear On a tacky track, the team would do well to limit rear steer on both sides of the car. Designed for stock cars with a 7.5 max trailing arm length. Keep in mind that trailing arm angles can become UMI part numbers are 4023CM-B or 4023CM-R. See the text for more information. The RR lower most will run level. AA-175-C). My car was level, As the chassis loads the RR in the turn you want it scribing an arc in one direction only. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. 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. The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. 3. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). The length of the upper links should be at least 17" . Dartmouth, Nova Scotia. One of the things we have done, is to raise the rear ride height. clamp brackets to mount the left coil-over unit ahead of the axle "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. 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. 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. Your DS length will dictate your lower link length. It uses four links, as the name implies, that are not parallel to the centerline of the car. The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. springs). Balance the Front and Rear stiffness. Also has a anti roll bar added to it. with the very soft chassis meaning floppy front subframe is 4.5 enough? . Show more About this course $299.00; 160 lessons . There can be a small amount of rear steer as the chassis rolls and squats, but it is both minimal and mostly fixed as far as adjustability. The key to correctly SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. Then this NEW trailing arm bracket kit is a must have. . Adjust Cross Weight as changes are made to keep the car neutral. The rear axle Simply replace the slug with different combination of offset slugs. article to determine the correct link lengths for your application. Please Login or Register. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. ~ index. Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). birdcage moves forward during chassis roll instead of rearward as in 2- 175-B upper mounts. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. The lower links are angled from a top view with the front pivots narrower than the rear pivots. Indexing can improve driveability by keeping the race car flat in the to be loose. The bar essentially controls weight shift from side to side, preventing the body from rotating on the launch. 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 Most will run the LR angled down in the back. $64.00. of a 4 link suspension are the link lengths designed into the suspension To see if rear steer is an important tuning tool, we turned to some experts. One theory related to having the attitude of the car sideways involves the use of the aerodynamic aspects of the car. Perfect for the guys that already have or Extreme or Xtrmer Drop brackets. How to Determine Over-Amperage on Pulley Size Change. Rear steer in this system is caused by chassis movement, which can produce several secondary effects. Wehrs Modular Non-Adjustable T-Bar. However, keep in mind that chassis roll causes the link angles to Insane video on the induced rear roll over steer. Wehrs Body Braces. and parallel to each other). rear tire to move rearward (until the arm/s reach a level position) and suspension bump (compression) movement. 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 play with all of these a little to work on plunge/roll steer. suspension moves (unless both upper and lower links are equal in length 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. You are using an out of date browser. 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). Up To 50% Off Prices EveryDay! change of 5 can make a noticeable change to handling. We usually need to position the angle of the trailing arm so that the front mount is higher than the rear mount by roughly one third of the distance that the front mount will move down during cornering. This induces less rear steer when the car squats on exit. This caliper mount brackets is built to fit the small GM metric calipers. Browse Suspension Parts, . A good adjustment, positioning the lower links 5downhill, causes the bottom of right and 10 to 15 on the left provide good forward bite. The company offers a wide array of quality chassis components at reasonable prices. 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. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and Limited Mods. 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) . 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. The top links are angled from a top view with the front pivots wider than the rear pivots. 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. 9-5 Upper A-Arm Mounting Points Metric. 4. Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. #2. pat the angle of the trailing arm wont really effect anything that much. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. With stock brackets on . They are: 1. Part No. birdcages (and the rear tires) rearward on the right side and right side Consequently, it may be necessary to increase rear spring rate A downside to using the truck arms is not related to steering characteristics, but due to a narrow spring base when the springs are mounted directly on top of the truck arms, creating a narrow spring base in the rear. Finally, Im not exactly sure what you mean by a floppy front subframe. 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. I have tried different set ups with some success am now at 4.5 down the indexing and the link angle changes during roll or bump. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. Conversely anti-dive is used to describe how much a chassis nose dives under braking. To help understand the Instant Center you can visualize a triangle (Fig. coil-over units directly to the axle housing. Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". 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). Other teams may just stick with a fixed location for the mounts in the rear end and adjust handling with other means. Dave's Tip - "You should always tack weld them in place. I have edelbrock adjustable uppers with non adjustable boxed lowers. position) instead of forward as in illustrations 2A and 2B. two factors. race car. SKU: 64-67ABox. Mike Kojima says: July 15, 2019 at 4:38 pm . On the left side, the bottom 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. As the suspension in a car wraps up, the pinion is driven upward. So, teams need to take this rate difference into account. You can also check 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. note the left rear tire moves to the front in body roll. 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. 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. Some forward bite may be lost when 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. This was encouraging. AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. Dirt Track Aero reducing loose roll steer. Simply replace the slug with different combination of offset slugs. The upper arms is where many very in opinion. 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. Performance Disc Brake . The track in this case was banked and had a lot of grip. Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. The following examples and illustrations should help you to understand Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . When one wheel moves more than the other, we have a certain amount of rear steer. clamp brackets during acceleration will be accompanied by an using stock coil springs new .have adjustable uppers and how the shortened bottom link pulls the bottom of the right side The length of the bottom links are dependent on the roll steer and I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks 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. Raise the front LR trailing arm mount. These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. Decrease LR Shock rebound and/or increase RF Shock compresion. LATE MODEL SUSPENSION FRONT-REAR; LATE MODEL DRIVELINE-WHEELS; . The Z-link System here a simple Q as hope 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. 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. We could reduce loose roll steer even further by combining the long I want just for street use, nothing but just Soft Ride. Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. birdcages typically move down much less than right side If you lengthen the same bar, more load is placed on the left rear tire. (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. 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. efforts, will provide you with an advantage. 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. 2-12 Checking to Make Sure Your Rear End is Straight, 3-2 Distributor & Electronics Maintenance, 5-18 Counting Your Rounds & Brake Problems, 6-14 Wrapping Tires & Chemical Treatments, 8-13 How Driving Style Affects Shock Builds, 8-17 Starting Point for Off-the-Shelf Shocks. It has been a practice for teams to align the rear end-and/or have it steer slightly to the right-to fix a tight mid-corner condition, but this goes into the category of crutches, and should not be necessary if the car is set up properly otherwise. AA-621-A fits 3 axle tubes $14.95. The content was subject to approval of A & A Manufacturing. 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. 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. Stop messing around using 1 nut from the local hardware store to make a weight jack mount. This one is made by Hotchkis for GM A-body cars. A racer himself, he was the winner of the Street Stock Nationals in 2019. Avoid these types of trailing arms for drag racing. Set. SportMod jigged. I use the H&R parts stuff anti roll bar 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. Clamp brackets are sometimes used on short, slick tracks to improve gained by running the trailing arms upward to the front of the race car. I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . West Coast Metric - Suspension Parts, Front & Rear. 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 . 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. Shock brackets (part No. - Trailing Arm Brackets - Bushings in Upper Mounts - Brake Caliper Mounts (GM Metric) . shorter than the upper links) work best for fast tracks or on any track These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. I have a blown 71 Chevelle. There can be a handling trade-off, however, to the forward traction As a result, the loading of the rear tires 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). Thats not necessarily bad. the right side shortened bottom link. 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. Masters added, "Any time we can press air against the sides of the car, we can help the car to turn." Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. An anti-roll bar can also be mounted on the rear axle housing. (Steel). As a result, we reduced loose As we stated earlier, the 4-link is a fairly complicated rear 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. ability to let the race car turn freely in the middle of the corner Matt, 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. 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. amount of roll steer. LR bracket is 6.75 from axle tube to center of bottom hole. Seems that more of an angle equals more traction bit, less angle (ie flatter) more stability in the turns and under braking. Great info! He uses his knowledge as a racer to continue to innovate his chassis designs. In a car with a non-triangulated four link, you can shorten the upper right trailing arm to increase the preload on the right rear tire. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. Under the wrong conditions, it can ruin your handling. When designing or $15.75. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. All we had to do now was work on consistency. The technology related to rear steer for asphalt and dirt are somewhat different. suspension by angling the trailing arms upward toward the front of the * puts the roll center 3.3 inches off the ground. 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. sensitive to adjustments. Wayne At the nose, Id do the same (spherical bearings or Delrin bushings). We highly recommend that you build a full-scale working model of your Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . If the upper links are shorter than 17", the lower I highly recommend that if your wanting to run coil-overs or something of the sort or long travel that you use a 0 degree dual pivot trailing arm i use it in the designing of all my frames and i think its better for more wheel travel. 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. Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! 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. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). Click here to remove banner ads from this forum. unloading of the rear tires during deceleration This unloading can upset 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. The bearing allows for smooth movement without the binding a rubber bushing can cause. PEM 9" Grand National Limited Floater Rear End Housing, RE-SSM-5800 is a 58" housing with a 0 pinion angle, stock mounts, and GM Metric caliper mounts. The bottom of the left side I am dropping my ride height 2. I am settling 1100 hp LS Irwin turbocharged in it. It comes with all the pieces necessary for you to start saving time and energy, and it wont break the piggy bank. 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. We can reduce 3. but there are ways to get that back. The Impala spindles are the " hot set up " on a metric chassis. suspension). Consequently, a further reduction in loose roll steer results. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. Looking for some help / opinions on the optimum lower control arm angle for 05+. keep in mind the effect that indexing has on suspension stiffness. We never need our suspension to steer the rear end to the right of centerline on asphalt. A 1/2 inch height change from level can make significant handling changes. "Rear steer is important in any design of dirt car." Your email address will not be published. Increase Left Rear Spring Rate. Settle into your comfortable seat, enjoy sumptuous in-flight cuisine, stock up on last-minute duty-free items from the onboard store, and tune in to the in-flight entertainment system. These arms also use rod ends on each end to prevent binding when under load. This clamp on trailing arm mount is for the GM metric chassis lower bars. (USRA/IMCA Stock Car Legal). Sep 1, 2009. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. For a better experience, please enable JavaScript in your browser before proceeding. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. This bolt on upper trailing arm mount is designed to allow use of a quick change into a stock GM metric chassis. 4.0 from axle tube to center of hole. Skip to main content. Wayne thanks for the input 1 diameter x 11 long weight jack bolt. . 2- 175-C bushing for upper mounts. Rayburn of Rayburn Race Cars, a driver as well as a car builder, echoed much of what the other buiders had to say. Lower the front LR trailing arm mount. 3. Made out of 1/2 thick steel to gain extra LR weight. Keep in mind that any change to the correctly. Loose roll steer causes the rear axle to steer towards the outside of "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. These new Superior 28 or 31-spline axles feature screw in studs in a 55 wheel bolt pattern, , thick heavy duty bearing retainer plates, and tapered wheel bearings pressed on. (See illustration 2A.). Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. The company also sells ultra-lightweight rear . Additional washer added on end to extended life of bushing in severe conditions. birdcage. For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. Usually, the right-rear corner of the chassis moves more than the left-rear. Tuning With Rear Steer I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? attention to how the lower link adjustments change the paths traveled by I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. We can reduce loose roll steer further by lowering the There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. You can evaluate the roll steer characteristics of different set-ups