The company offers a wide array of quality chassis components at reasonable prices. This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. When you find the correct amount of rear steer, stay there and tune the handling with the other components. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. Wehrs Bent Suspension Tubes 5/8"-18 Thread. Decrease LR Shock rebound and/or increase RF Shock compresion. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). Decrease the Angle of the Upper Trailing Arm. Just as bad, some of the top-mount arms (ones that physically raise the upper trailing arm location on the rear end housing) have a tendency to hammer the trunk floor when you get on the throttle. 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). However, the 650 whp. Picture does NOT represent all jig options. 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. but there are ways to get that back. $15.75. 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. That way, the car will stay as fast and balanced as it can be throughout all of the changing conditions. One fix is to position the links so that the The Z-link System One of the things we have done, is to raise the rear ride height. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. positioned ahead of the axle and attached to bottom links further as shown in illustration 2C. Tuning With Rear Steer The variation of height for the right-rear trailing arm is very small. Ask me how I knowL-O-L. Hope that gets you sorted out. With so much movement, we can plan out our rear steer just about any way we need it. $149.99; 149 - Reward points. to enhance the forward bite. This was encouraging. suspension is to shorten the bottom links. all the best parts. These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. The popularity of the 4-link suspension is due primarily to its chassis. springs). 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. Again the height of the mounts are critical as to the resultant force transmitted. The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. KT-1A). So, teams need to take this rate difference into account. Wehrs Metric Trailing Arm Bolt. 1-15 How Important is it to Bump the Left Front? right side link is from 3 to 5 higher than the left when the chassis No more than 10-15 pound difference, excess split makes car tight. Rear steer can either tighten a car or make it very loose. The condition is referred to as As far as the geometry related to rear steer is concerned, this is an ideal system. Trailing arms mounted in this manner cause the rear tires to Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. 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. Lower the front LR trailing arm mount. traveled by the centers of the birdcages during chassis roll. Copyright Racelogic Chassis School 2023. 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. Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. Photo courtesy of BMR. the bottom of the Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. . corners. All driving train actually repalced with Moog components.. Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). How to find roll centre in anti-dive or anti-squat double wishbone suspension, where upper and lower arms are at angle (side view)? (Sold Individually). On most flat- to medium-banked tracks, the left-rear moves very little. just ordered the adjustable lowers We could reduce loose roll steer even further by combining the long this important function of the lower links. The key to correctly Those conditions rarely exist on dirt. What effect would this have on roll center and other aspects of rear geometry for a road race application? 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. clamp brackets to mount the left coil-over unit ahead of the axle Dirt Track Aero Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. right side 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. He will be showing the latest tools to enhance your chassis set up. 4.0 from axle tube to center of hole. loose roll steer. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. cause a gas pedal push. the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). The Metric four-link suspension design is a bit different than most other rear suspensions. 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. Adjust the pinion angle. In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. Tack weld the slugs to secure them to the trailing arm. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. you to better understand the 4-link suspension. Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. Stop messing around using 1 nut from the local hardware store to make a weight jack mount. REAR SUSPENSION: The following is a general list of rear ends and their dimensions to help narrow the search for a possible candidate to replace the torque tube rear end or just get a better set of gears for highway driving. Raise the front LR trailing arm mount. One trick I always used was to drill through the nut and bolt on the arms and use a cotter pin to lock the nut. On the left, we have reduced the forward movement of Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. Designed for stock cars with a 7.5 max trailing arm length. And have fun at SIR! $64.00. 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. forward (See illustration 1). A difference of heights can help or hurt rear traction. The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. Looking for increased forward bit and traction? AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. birdcages move up during chassis roll, the overall effect, when But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. clamp brackets (since there's no longer any indexing of the With stock brackets on . tire loadings. Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. On cars with triangulated upper control arms, you cant set preload with adjustable arms. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. 4. 4-link, or use the design parameters mentioned in this article, to help The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). 3. Excess loading of either the left- or right-rear tires decreases traction in most cases. As a result, the springs and Bad shocks (and/or messed up valving) can be the culprit. clamp brackets and ahead of the axle can improve forward bite on 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). However, In short Made out of 1/2 thick steel to gain extra LR weight. "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. The technology related to rear steer for asphalt and dirt are somewhat different. forward(L.S.) Wehrs Bent Suspension Bar Angle Finder. It takes less than two hours for an experienced welder to install the kit.. Please Login or Register. The setup is balanced when the LF and LR tire temps are similar. Change your lead or trail of the rear end by simply changing the combination of offset slugs. Then this NEW trailing arm bracket kit is a must have. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. During chassis roll, indexing loads the right rear tire and unloads Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. front of the Everything needs to be free to move or you will chase crazy problems and never figure it out. best for tight, flat race tracks or on any track where the chassis tends links have to be extremely short to minimize loose roll steer. The 4-link is a relatively complex rear suspension that is very When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? preceding paragraphs should help you understand why. This one is made by Hotchkis for GM A-body cars. The The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. After subframe support arm is out of the way, unscrew the . It comes with a locking bolt to tighten the bushing. 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. July 1st. Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. The rear will have Viking coil over shocks . SportMod jigged. For a better experience, please enable JavaScript in your browser before proceeding. At best, any trailing arm arrangement is a compromise between 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? Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. link lengths and angles and how the relationship affects roll steer and Additional washer added on end to extended life of bushing in severe conditions. If the link angles become more upward on the left than on the Street Stock.
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