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). Dave's Tip - "You should always tack weld them in place. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. Picture does NOT represent all jig options. This induces less rear steer when the car squats on exit. Fox80. However, keep in mind that chassis roll causes the link angles to BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). shorter than the upper links) work best for fast tracks or on any track Keep in mind that trailing arm angles can become 4.0 from axle tube to center of hole. 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. 266. Masters added, "Any time we can press air against the sides of the car, we can help the car to turn." Change your lead or trail of the rear end by simply changing the combination of offset slugs. $15.75. Dirt Track Aero Any of you guys changed any angles on trailing arms etc on a metric to make it faster? bottom link arrangement of illustration 2C on the left side and the what wold be the best angles to be at for most foward bite along with handling four all four links ? 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. Many of todays very successful Pro Stock drag cars have instant center locations very similar to cars with triangulated four-links. These arms also use rod ends on each end to prevent binding when under load. taken off An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. stop and go or slick race tracks. Any angle up hill to the right rear will cause upward force on both tires and unload both tires. For a better experience, please enable JavaScript in your browser before proceeding. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). 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. Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. Notice how this Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. 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. Do I need to change my angles on my trailing arms to get forward bite? These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. This helps make the rear steer characteristics more adjustable for the changing conditions. If the link angles become more upward on the left than on the The RR lower most will run . front of the C.J. Condition: New. coil-over units on A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. What is wrong ? Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. Below you'll find a selection of our flight destinations to spark your interest. 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. the indexing and the link angle changes during roll or bump. "We have always wanted rear steer," he said. Jul 23, 2001. So how do you make it work? 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). These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. 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. Clamp brackets are sometimes used on short, slick tracks to improve traveled by the centers of the birdcages during chassis roll. These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. The front locating points must be in the stock locations. On cars with triangulated upper control arms, you cant set preload with adjustable arms. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. Unbolt and remove one upper rear control arm using a " wrench. 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. 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. Then this trailing arm bracket kit is a must have. 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. springs). On the left side, the bottom 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. 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. We do not necessarily need to know the exact amounts of rear steer our cars are subjected to, but we do need to have a solid understanding of what produces rear steer and what effect rear steer has on the handling in our cars. Compared to the 4-bar cars, it has more limited adjustment for rear steer and historically has worked well on the tighter and more highly banked race tracks because the rear end is pointed more straight ahead. suspension. As far as the geometry related to rear steer is concerned, this is an ideal system. SN95 - Rear lower control arm angle | TrackMustangsOnline.com This will give you a lower rear roll center and aide side bite. 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. . Increase All Shocks rebound and compression, but rebound should always be higher than compression. Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. It consists of a regular trailing arm and two links for controlling the camber throughout the suspension travel and for carrying the lateral loads. Semi trailing arm suspension explained - YouTube When designing or Race car suspension Class | Page 9 | Physics Forums The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. Wehrs Body Bolt Panel Inserts. Tack weld the slugs to secure them to the trailing arm. The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. Trailing Arms | QA1 Indexing is greatest when there is a lot of When the track goes slick, especially dry slick, rear steer is needed. clamp brackets to mount the left coil-over unit ahead of the axle right amount of loose roll steer can help a race car to turn the corner Chassis Tuning & Install - Southside Machine Performance On most asphalt 3-link cars, the right-rear trailing arm mostly controls rear steer due to body roll. Street Stock. Under the right conditions, rear steer can be beneficial and enhance performance. The lower links are angled from a top view with the front pivots narrower than the rear pivots. Decrease the Pre-Load on the Stabilizer Bar. you will speed up your learning process by working with a model. You should pay close to -mile numbers by multiplying by 1.54. ~ index. Triangulated 4-Links: Make Your Stock Suspension Car Work The following examples and illustrations should help you to understand KT-1B) sells for $96.00. All we had to do now was work on consistency. As a result, the loading of the rear tires about rear suspensions. From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. the bottom of the Looking for that edge over everyone else. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . 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. You should keep in mind that any loading of the rear tires caused by Raise the Rear Panhard Bar Up on both sides. Not sure if there are any big "Tricks". The upper trailing arm mounts (part No. A rear end steered to the left of centerline will cause the thrust angle to be left of centerline and make the car tighter on entry and tighter on exit under acceleration. loose roll steer. Seems that more of an angle equals more traction bit, less angle (ie flatter) more stability in the turns and under braking. coil-over units directly to the axle housing. gained by running the trailing arms upward to the front of the race car. Photo courtesy of BMR. (Steel). forward bite and roll steer. adjustment, positioning the lower links 5downhill, causes the bottom of Location. mounted 5 downwards to the front, coupled with 17 1/2 top links, on rough race tracks. The 2-day class is broken down section by section. Adjustable arms allow easy rear suspension . Our services include: Bushing overhauls, suspension repairs . My car had 7Deg of angle it. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. Rear steer in this system is caused by chassis movement, which can . Now available value added Metric Rear Control Arm . right and 10 to 15 on the left provide good forward bite. Suspension movement usually increases when the coil-over units are The popularity of the 4-link suspension is due primarily to its wood, aluminum strips, etc. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . Dartmouth, Nova Scotia. Also, how old are the shocks and have you ever had the valving checked? Photo courtesy of Hotchkis Suspension. birdcages (and the rear tires) rearward on the right side and right side : ; 300 euro energiepauschale; rear trailing arm mounts frame repair AA-175-C). Long bottom links (equal in length or no more than 1 Up To 50% Off Prices EveryDay! Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. Your email address will not be published. PDF Metric 4 Link Setup For Dirt - annualreport.psg.fr The company manufactures the kits lower trailing arm mounts (part No. Mounts J-Bar to QC rear end 4 3/8 offset from pinion. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). This saves wear and tear on your U-joints while . See all 6 photos. Indexing can improve driveability by keeping the race car flat in the if the left rear of your chassis hikes up during cornering, loose roll The length of the bottom links are dependent on the roll steer and Trailing arms mounted in this manner cause the rear tires to 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. Simply replace the LR bracket and have increase drive and adjustability. The 4-link is a relatively complex rear suspension that is very path traveled by any trailing arm will affect roll steer. With this design, lateral movement of the rear end causes rear steer. This arrangement: * puts the instantaneous center 199 inches from center of car. In simple terms, it keeps the body from roll rotating on the launch. and the angles to which the links are adjusted. Suspension Division. clamp brackets during acceleration will be accompanied by an 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets This raised the rear roll center and hurt side bite, but aided forward bite. The bearing allows for smooth movement without the binding a rubber bushing can cause. Designing and tuning the 4 link rear suspension - Jasco Automotive Ltd This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. to enhance the forward bite. This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. 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 . The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. However, indexing can cause the rear suspension to be too harsh Basically, we've position the bottom links to counteract the Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. Make small adjustments if you feel a need. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. 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. Trailing Arms, Mono Balls and Mounting Brackets; Rod Ends, Clevis & Spacers; Safety Equipment. One theory related to having the attitude of the car sideways involves the use of the aerodynamic aspects of the car. Order your Trailing Arm 2 Piece Set - today at 1AAuto.com. Rethink Dirt: Advanced Dirt Track Theory | Hyper Racing 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. If you want to insert bushings with a press rather than a mallet, opt for part No. The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. 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. That saved the factory some money. Decrease LR Shock rebound and/or increase RF Shock compresion. 4-link, or use the design parameters mentioned in this article, to help rear tire to move rearward (until the arm/s reach a level position) and Since we cannot lump them together, we will analyze them separately. "Rear steer is important in any design of dirt car." 2). Some manufacturers have added multiple mounting points on the front and rear chassis mounts. No more than 10-15 pound difference, excess split makes car tight. This was encouraging. Looking for increased forward bit and traction? In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. You can counteract this force by preloading the suspension. right, the left rear tire can become loaded more quickly than the right Owner-operator at Race Products Inc. This condition may right side link is from 3 to 5 higher than the left when the chassis birdcage moves forward during chassis roll instead of rearward as in 3. change. 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. One fix is to position the links so that the Insane video on the induced rear roll over steer. Pem 9" Grand National Limited Floater Rear End Housing - Re-ssm-5800 The first element to understand about rear steer is that it is caused by rear suspension movement. Phone (07) 31033011 Between - 9:30am - 4:30pm. 650 whp. 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. by running the trailing arms upward towards the front. #2. pat the angle of the trailing arm wont really effect anything that much. If you lengthen the same bar, more load is placed on the left rear tire. This type of suspension has coil springs and upper and lower trailing arms (also called control arms). Decrease RR Trailing Arm length by 1/8 inch. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . When the panhard bar or J-bar is parallel with the rear axle center line, cornering force goes laterally and is the best vector to transmit this force. 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. Thanks . Increase Left Rear Spring Rate. Designed for stock cars with a 7.5 max trailing arm length. loading of the rear tires. Also has a anti roll bar added to it. I like to see a 1" long weld on the top inside of the right side. LR bracket is 6.75 from axle tube to center of bottom hole. But is at ride height. acceleration causes the rear axle & chassis to separate. These systems only steer to the left and have a limited amount of steer. "loose roll steer". Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. illustration 2B where the links are level. sensitive to adjustments. 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. Cf: a c t i v i t . Decrease the Split on the Rear Panhard Bar Heights. Justin is the owner of High Roller Race Cars. Metric Four-Link Suspension Design - Circle Track Magazine - MotorTrend AA-621-A fits 3 axle tubes $14.95. 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.