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Built with corrected pinion angle and our proven "Pull" Bushings. (USRA/IMCA Stock Car Legal). We could reduce loose roll steer even further by combining the long forward on the left side during chassis roll. Then, a 1" weld on the bottom inside of the left side." The reason rear steer aero might be important comes on dry, slick surfaces, where the tires do not grip well. If you dont do anythinig else. Preload is another tuning tool to counteract body roll rotation. Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. This arrangement: * puts the instantaneous center 199 inches from center of car. Remove only one control arm at a time. Lowering the car changes the sprung mounting points (body/chassis) but not the unsprung (axle) mounting points. Departing from Ho Chi Minh City. Photo courtesy of Hotchkis Suspension. To see if rear steer is an important tuning tool, we turned to some experts. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). The length of the upper links should be at least 17" . You can use cardboard, Our services include: Bushing overhauls, suspension repairs . minor relative to the overall handling improvement that is realized by There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. 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. This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. the race car enhance forward bite by using axle thrust to quicken the In short 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. . with the very soft chassis meaning floppy front subframe is 4.5 enough? Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. 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). We use the upper links on a 4-link suspension (USRA/IMCA Stock Car Legal). Bad shocks (and/or messed up valving) can be the culprit. AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. Clamp brackets are sometimes used on short, slick tracks to improve This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. Just opposite of whats pictured here. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. I was looking for more info on stock rear 4 link trailing arm angles. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. 88 metric lower trailing arm $65.00. LATE MODEL SUSPENSION FRONT-REAR; LATE MODEL DRIVELINE-WHEELS; . The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. 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 . Housings have fill and drain plug installed. clamp brackets during acceleration will be accompanied by an I am dropping my ride height 2. This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. Facebook; Twitter; Youtube; Pinterest; contact us . AA-175-D. The significance of this, for the purpose of this article, is that the chassis travel in a Z-link is enhanced compared to the 4-link suspension when using the same installed spring rate, and this causes quite a bit of chassis travel and related rear steer. We can relate 1/8-mile e.t. 6. Learn how your comment data is processed. Wehrs Modular Non-Adjustable T-Bar. I have a blown 71 Chevelle. best for tight, flat race tracks or on any track where the chassis tends 2.5 drop trailing arm brackets slotted to accept offset slugs. the bottom links are lowered but the effect on forward bite is usually How to Determine Over-Amperage on Pulley Size Change. and the angles to which the links are adjusted. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . Under the wrong conditions, it can ruin your handling. This way you could keep them loose and free and keep the nuts on. suspension by angling the trailing arms upward toward the front of the You can evaluate the roll steer characteristics of different set-ups (during acceleration) is quickened and forward bite is enhanced. to -mile numbers by multiplying by 1.54. The upper arms are angled to form the triangle that gives the suspension its name. 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. Upper link angles from 15 to 18 on the This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. The popularity of the 4-link suspension is due primarily to its The two most critical factors to the performance NOTE: If installing on a Frankland quick change, the bracket will need to be modified and reinforced to fit. Bars like this are typically welded into the chassis and tied to the housing by adjustable links. KT-1B) sells for $96.00. Suspension movement usually increases when the coil-over units are Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. conditions, bottom links 2 shorter than the upper links work well. am out of adjustment on the uppers so will be installing a set of adjustable lowers $ During chassis roll, trailing arm/s mounted upwards will cause the right Kit includes required Custom length Double Adjustable upper control arms. Rayburn of Rayburn Race Cars, a driver as well as a car builder, echoed much of what the other buiders had to say. Thanks . 2). 122. Location. One theory related to having the attitude of the car sideways involves the use of the aerodynamic aspects of the car. With this design, lateral movement of the rear end causes rear steer. I have edelbrock adjustable uppers with non adjustable boxed lowers. Increase the Angle of the Upper Trailing Arm. Thanks so much! birdcage. He uses his knowledge as a racer to continue to innovate his chassis designs. 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. Tuning With Rear Steer 4.0 drop trailing arm brackets slotted to accept offset slugs. SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. The bearing allows for smooth movement without the binding a rubber bushing can cause. The upper arms is where many very in opinion. loose roll steer tendency caused by the steep angles of the upper links. Most often, the factory trailing arms are simply a stamped metal arm. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. bottom link arrangement of illustration 2C on the left side and the I'm not sure of the Task Force width . During chassis roll, indexing loads the right rear tire and unloads My lower trailing arm is level. Mounting both As far as the geometry related to rear steer is concerned, this is an ideal system. forward (See illustration 1). Under most current rules, there is no adjustment for amounts of rear steer with these systems. This saves wear and tear on your U-joints while . wood, aluminum strips, etc. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? 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. Most will run the LR angled down in the back. I have tried different set ups with some success am now at 4.5 down positioned ahead of the axle and attached to Wehrs Body Bolt Panel Inserts. KT-1A ). All we had to do now was work on consistency. If you lengthen the same bar, more load is placed on the left rear tire. Usually, the right-rear corner of the chassis moves more than the left-rear. Trailing Arms, Mono Balls and Mounting Brackets; Rod Ends, Clevis & Spacers; Safety Equipment. At best, any trailing arm arrangement is a compromise between This has been confirmed by studying data from onboard computer systems during testing that show shock travel amounts in the turns. 3. link lengths and angles and how the relationship affects roll steer and To understand how a 4-link can be Long bottom links (equal in length or no more than 1 race car. What is wrong ? However, indexing can cause the rear suspension to be too harsh This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and Limited Mods. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction 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. So, teams need to take this rate difference into account. forward(L.S.) If the link angles become more upward on the left than on the (Sold Individually). the bottom of the . ~ index. As a result, the loading of the rear tires (on a clamp bracket) generally tightens corner handling. 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. A 1/2 inch height change from level can make significant handling changes. With the trailing arms toed in at the front you can use the J-Bar mounting angle to help steer the rear end through roll. Truth!^^^^^. Keep in mind that any change to the what wold be the best angles to be at for most foward bite along with handling four all four links ? Has boxed lowers, adjustable uppers , stock springs and shock. If excessive, loose roll steer can cause a loose C.J. 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? can tighten overall corner handling by using These systems only steer to the left and have a limited amount of steer. Your DS length will dictate your lower link length. For example, in illustration 2A, both the top and the bottom links On most flat- to medium-banked tracks, the left-rear moves very little. Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. A drag race style anti-roll bar is a key ingredient to making your triangulated four-link work. short bottom link arrangement of illustration 2D on the right side. On cars with triangulated upper control arms, you cant set preload with adjustable arms. 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 shocks are compressed from both ends at once and the suspension becomes Wayne "High left-rear loading does not increase traction," he said. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. "Rear steer is important in any design of dirt car." This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. 266. Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. 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). Designed for stock cars with a 7.5 max trailing arm length. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. the bottom of the Some forward bite may be lost when Wehrs Bent Suspension Tubes 5/8"-18 Thread. Please Login or Register. Part No. gained by running the trailing arms upward to the front of the race car. You should keep in mind that any loading of the rear tires caused by If the upper links are shorter than 17", the lower Mounts J-Bar to QC rear end 4 3/8 offset from pinion. Wehrs Modified Valance Support. 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. 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. The RR lower most will run level. Dual internal gusseting provides strongest rear end in the industry. The rear will have Viking coil over shocks . forward bite and roll steer. clamp brackets are used in front of the axle, axle wrap-up during (Sold Individually). it feels as a plank over nude bearings on the road .. 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. Cf: a c t i v i t . * upper control arm angled down from ball joint to pivot at 1.4 degrees. This type of suspension has coil springs and upper and lower trailing arms (also called control arms). Performance Disc Brake . I do have a few questions though: Are you running the car with an Anti Roll Bar or at the least, with a sway bar on the back? The upper trailing arm mounts (part No. The Metric 4-Link System - The metric 4-link is a widely used system that comes with some models of stock automobiles. A difference of heights can help or hurt rear traction. the right side wenee9w Pit Crew. If you look at a modern dirt Late Model, the sides are made up of big, flat panels similar to the sides of a Sprint Car wing. currently using 4.5 down and it picked up 60. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. Can I convert a combustion engine car to a hybrid car? 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. made to provide such handling, you must first understand a few basics . Raise the Rear Panhard Bar Up on both sides. This will make it easier to line up the new control arms when they are installed. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. $64.00. In this case, that equates to a 10.80. Soft springs, a left chassis-mounted track bar, and easy-up shocks on the left side all promote the body roll that produces rear steer to the right. Rear steer in this system is caused by chassis movement, which can . Your email address will not be published. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). On the left side, the bottom Lower the Rear Panhard Bar on both sides. My rear end is a nine inch ford with the large pinion. unloading of the rear tires during deceleration This unloading can upset the race car upon corner entry -especially when both coil-over units are Wayne 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. Since then, hes been a columnist, writer, and photographer, in racing and in mainstream media, for several outlets, including the Journal Inquirer, Boston Herald, Stock Car Racing, and Speedway Illustrated. The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. Bushings in Upper Mounts These arms fit 1978-87 GM G-body cars (Malibu, Monte Carlo, Regal, Cutlass, Grand Prix). Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . clamp brackets. Adjust the pinion angle. Your email address will not be published. Dave is the owner of Hammond Motorsports. birdcages typically move down much less than right side Dirt Track Aero this important function of the lower links. That saved the factory some money. You can Watch, Rewind, and Watch Again. In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. 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. The front locating points must be in the stock locations. The idea is to trace the paths actually Add to cart Details. to enhance the forward bite. movements of the There can be a handling trade-off, however, to the forward traction clamp brackets to mount the left coil-over unit ahead of the axle birdcage to move forward more during chassis roll than in This is your problem, (sprung v. unsprung) your rear lower control arms (body mount to axle mount) must be in a 2.0-3.0 degrees (max) downward slope to the rear axle. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. The Z-link System The roll angles and vertical movement on a dirt car can be very pronounced.