Add to cart Details. Adjust the pinion angle. Looking for that edge over everyone else. if the left rear of your chassis hikes up during cornering, loose roll 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. Mike Kojima says: July 15, 2019 at 4:38 pm . 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. 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. These systems only steer to the left and have a limited amount of steer. I'm new at this how do u do that and does it makr a big difference. We can relate 1/8-mile e.t. the other illustrations. clamp brackets. We could reduce loose roll steer even further by combining the long Wayne There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). Its on a car that Im helping with. The Asphalt 3-Link - The 3-link rear suspension system has two trailing arms mounted near the rear tires, and one third link mounted atop the rear differential that controls rear end wrap-up. The RR lower most will run . With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. On asphalt, do not make large changes to components that influence rear steer. (Steel). The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. Description. 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. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. The rear axle Then this NEW trailing arm bracket kit is a must have. with the very soft chassis meaning floppy front subframe is 4.5 enough? Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". rear tire to move rearward (until the arm/s reach a level position) and Part No. link lengths and angles and how the relationship affects roll steer and When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. Keep in mind that trailing arm angles can become The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. traveled by the centers of the birdcages during chassis roll. Dirt Rear Steer No more than 10-15 pound difference, excess split makes car tight. the bottom of the Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. My upper a arm is at a 10 degree angle pointing down towards the front. : ; 300 euro energiepauschale; rear trailing arm mounts frame repair These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. I have tried different set ups with some success am now at 4.5 down 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. Departing from Ho Chi Minh City. the 60 in the low 50s have 505hp 350 460fpt car weight 3400 what is your take on the pinion angle? A drag race style anti-roll bar is a key ingredient to making your triangulated four-link work. right, the left rear tire can become loaded more quickly than the right (Try to bounce the rear of a car with a 4-link rear Suspension Division. My lower trailing arm is level. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. The top links are angled from a top view with the front pivots wider than the rear pivots. the left rear tire to move forward. JavaScript is disabled. On most asphalt 3-link cars, the right-rear trailing arm mostly controls rear steer due to body roll. #2. pat the angle of the trailing arm wont really effect anything that much. Another method used to reduce the loose roll steer of a 4-link Here is how each system functions and how they can be adjusted for the "degree" of rear steer. Bad shocks (and/or messed up valving) can be the culprit. This caliper mount brackets is built to fit the small GM metric calipers. Conversely anti-dive is used to describe how much a chassis nose dives under braking. (more on this later). Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. Looking for increased forward bit and traction? 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. The front may be too stiff compared to the rear. Change your lead or trail of the rear end by simply changing the combination of offset slugs. I have a blown 71 Chevelle. The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. A 1/2 inch height change from level can make significant handling changes. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . This induces less rear steer when the car squats on exit. As we stated earlier, the 4-link is a fairly complicated rear Rayburn of Rayburn Race Cars, a driver as well as a car builder, echoed much of what the other buiders had to say. To help understand the Instant Center you can visualize a triangle (Fig. BMS Racecars - Winning's not just a goal it's a tradition! Adjust the length of the control arms as needed to achieve the desired pinion angle. The upper trailing arm mounts (part No. As a result, the loading of the rear tires Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. 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. They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. Wayne You can counteract this force by preloading the suspension. Followed your advice and got a set of adjustable lowers. shocks are compressed from both ends at once and the suspension becomes gained by running the trailing arms upward to the front of the race car. However, keep in mind that chassis roll causes the link angles to These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. In this case, that equates to a 10.80. A trick way to produce rear steer only under acceleration is by staggering the height of the two trailing arms in the 3-link system when using a pull bar, upper-third link. You are using an out of date browser. Can be used on both 9" Ford and quick change rear end tubes. We never need our suspension to steer the rear end to the right of centerline on asphalt. clamp brackets during acceleration will be accompanied by an "Rear steer is important in any design of dirt car." Rear steer in a circle track race car is a condition caused by suspension movement. (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 live class took place January 22-23, 2022. 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. This clamp on trailing arm mount is for the GM metric chassis lower bars. 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. He will be showing the latest tools to enhance your chassis set up. suspension. Part No. 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 . This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. 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. These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. path traveled by any trailing arm will affect roll steer. Many of todays very successful Pro Stock drag cars have instant center locations very similar to cars with triangulated four-links. Built with corrected pinion angle and our proven "Pull" Bushings. A racer himself, he was the winner of the Street Stock Nationals in 2019. The upper arms are angled to form the triangle that gives the suspension its name. My trailing arms are stock triangulation. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. During chassis roll, trailing arm/s mounted upwards will cause the right This induces rear steer when the car squats on exit. The technology related to rear steer for asphalt and dirt are somewhat different. 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. 2- 175-C bushing for upper mounts. short bottom link arrangement of illustration 2D on the right side. two factors. The lower links are angled from a top view with the front pivots narrower than the rear pivots. As far as the geometry related to rear steer is concerned, this is an ideal system. article to determine the correct link lengths for your application. Finally, Im not exactly sure what you mean by a floppy front subframe. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. Reply. 2.5 drop trailing arm brackets slotted to accept offset slugs. clamp brackets (since there's no longer any indexing of the Browse Suspension Parts, . One fix is to position the links so that the 2). 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. (Sold Individually). I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. Great info! The variation of height for the right-rear trailing arm is very small. length and/or angle difference in the upper and lower links. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. When designing or shorter than the upper links) work best for fast tracks or on any track 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. Suspension Parts, Front & Rear parts . Indexing can improve driveability by keeping the race car flat in the We've I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. birdcage to move forward more during chassis roll than in Thanks. 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. bottom links further as shown in illustration 2C. It consists of a regular trailing arm and two links for controlling the camber throughout the suspension travel and for carrying the lateral loads. Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. Rayburn builds the swing-arm type of rear suspension. shocks and springs. Balance the Front and Rear stiffness. When the rear links are too short forward bite and minor relative to the overall handling improvement that is realized by Also has a anti roll bar added to it. Trailing arm bushings come included (part No. 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. The adjuster is at the front of the bar. 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. the race car enhance forward bite by using axle thrust to quicken the The Standard 4-Bar System Our services include: Bushing overhauls, suspension repairs . I want just for street use, nothing but just Soft Ride. 266. RAceman. I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. 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. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. I am settling 1100 hp LS Irwin turbocharged in it. You can use cardboard, 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. This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. and the angles to which the links are adjusted. Wehrs Modified Valance Support Weld On Clevis. These are BMR upper trailing arms for 1979-2001 Mustangs. 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. 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. $15.75. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. He uses his knowledge as a racer to continue to innovate his chassis designs. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. All driving train actually repalced with Moog components.. Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. forward bite and roll steer. chassis up during acceleration which can reduce the effectiveness of the Kit includes required Custom length Double Adjustable upper control arms. everything is a compromise. 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. am out of adjustment on the uppers so will be installing a set of adjustable lowers if u could move trailing arm mount on chassis with the uppers as close to the rearend housing as can get and the lowers 2.5 away from housing. can tighten overall corner handling by using birdcage now moves rearward (until the link reaches a level race car. If both sides are configured to move in opposite directions, then rear steer can be extreme. Basically, we've position the bottom links to counteract the (Sold Individually). It comes with a locking bolt to tighten the bushing. Decrease LR Shock rebound and/or increase RF Shock compresion. Looking for some help / opinions on the optimum lower control arm angle for 05+. Make small adjustments if you feel a need. Decrease the Rear Weight Bias. 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. the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). Compare the measurements to specifications. 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. (Steel). The bushings wore out in the lowers and my left tire got in the wheel tub. It comes with a locking bolt to tighten the bushing. The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. How to Determine Over-Amperage on Pulley Size Change. On extremely slick race tracks, you Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. (USRA/IMCA Stock Car Legal). Thanks . A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. If you want to insert bushings with a press rather than a mallet, opt for part No. What is wrong ? are used to help control loose steer. very stiff. just ordered the adjustable lowers Part No. AA-175-D. AA-621-B fits 2-5/8 ones $14.95. 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. $64.00. stop and go or slick race tracks. Realize that you can increase forward bite on any type of rear of a 4 link suspension are the link lengths designed into the suspension 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. 2.50 from axle tube to center of hole. We hope the information in this article, combined with your There are a few similarities, but many differences in how we evaluate and use rear steer for each group. Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. birdcage does lose some of its rearward movement because of the This condition will cause loose handling-especially A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. 3. Lower the front LR trailing arm mount. We use the upper links on a 4-link suspension 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. steer may increase whenever both bottom links are shortened! during acceleration (due to the axle thrust effect). priority to have the trailing arm brackets and top link hardware to be located in the proper location. We can reduce loose roll steer by making the lower links shorter than the upper links (more on this later). That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. 4. However, indexing can cause the rear suspension to be too harsh 1-15 How Important is it to Bump the Left Front? Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. Thats not necessarily bad. The A & A Manufacturing stock trailing arm mounting kit (part No. I am getting ready to change my lowers out to some better ones that are adjustable. Owner-operator at Race Products Inc. If excessive, loose roll steer can cause a loose LR bracket is 6.75 from axle tube to center of bottom hole. It seems not being an Irak/bu . 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. UMI part numbers are 4023CM-B or 4023CM-R. Simply replace the LR bracket and have increase drive and adjustability. On the left side, the bottom 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. You should use the information in this In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. Clamp brackets are sometimes used on short, slick tracks to improve The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. But attention to how the lower link adjustments change the paths traveled by Stronger is Better. Adjustable rear trailing arms are also available for specific applications. 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? 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.