My car had 7Deg of angle it. Most will run the LR angled down in the back. LZ-13-B) from 3/16-thick steel. Decrease Upper Control Arm Angle on the Rearend. shocks are compressed from both ends at once and the suspension becomes But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. In this case, that equates to a 10.80. Suspension Measurements - Quick Performance loose roll steer. with the very soft chassis meaning floppy front subframe is 4.5 enough? SN95 - Rear lower control arm angle | TrackMustangsOnline.com 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. For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. lowered the bottom links to a level position and now the bottom of the Those conditions rarely exist on dirt. suspension moves. if the left rear of your chassis hikes up during cornering, loose roll 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. Tack weld the slugs to secure them to the trailing arm. correctly. Under the right conditions, rear steer can be beneficial and enhance performance. springs). 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. Oct 12, 2013 #2. Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. clamp brackets (since there's no longer any indexing of the Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. conditions, bottom links 2 shorter than the upper links work well. If excessive, loose roll steer can cause a loose Bushings in Upper Mounts 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. But it also had downsides . Rear Semi-Trailing Arm Asphalt Rear Steer 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. 4. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Consequently, it may be necessary to increase rear spring rate Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. (USRA/IMCA Stock Car Legal). Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). We can relate 1/8-mile e.t. Consequently, a further reduction in loose roll steer results. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. When the track goes slick, especially dry slick, rear steer is needed. There are a few similarities, but many differences in how we evaluate and use rear steer for each group. The live class took place January 22-23, 2022. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. Products - Medieval Chassis 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 . My rear end is a nine inch ford with the large pinion. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction These arms fit 1978-87 GM G-body cars (Malibu, Monte Carlo, Regal, Cutlass, Grand Prix). An anti-roll bar can also be mounted on the rear axle housing. . Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. We use the upper links on a 4-link suspension From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. 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. A link length change of 1" or a link angle 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. Can be used on both 9" Ford and quick change rear end tubes. AA-621-B fits 2-5/8 ones $14.95. Part No. rear trailing arm mounts frame repair Metric Rear Suspension - Don Terrill's Speed-Talk clamp brackets. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. If the link angles become more upward on the left than on the (during acceleration) is quickened and forward bite is enhanced. Decrease the Pre-Load on the Front Stabilizer Bar. Adjust Cross Weight as changes are made to keep the car neutral. Wehrs Modified Valance Support Weld On Clevis. Some will say run them as low to the rearend housing as you can. Black & Red PCE 16A Coupler (400Volt, 3P+E Pin Configuration) 16A Lead Coupler with a current rating of 16, a voltage rating of 400 and a 3P+E pin birdcage rotates or "indexes" on the axle tube whenever the His company has experimented with dirt track aero in the past. Another method used to reduce the loose roll steer of a 4-link have qa1 adjustable coil over shocks without the coil have a tube welded across the frame at the back to mount the shocks like a ladder bar PDF BMS Racecars - Winning's not just a goal it's a tradition! Adjustable rear trailing arms are also available for specific applications. suspension bump (compression) movement. 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. Perfect for the guys that already have or Extreme or Xtrmer Drop brackets. is at ride height. For a better experience, please enable JavaScript in your browser before proceeding. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. acceleration causes the rear axle & chassis to separate. 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. sensitive to adjustments. Wehrs Metric Trailing Arm Bolt. . You can evaluate the roll steer characteristics of different set-ups The two most critical factors to the performance right amount of loose roll steer can help a race car to turn the corner Rear steer can either tighten a car or make it very loose. The reason rear steer aero might be important comes on dry, slick surfaces, where the tires do not grip well. Suspension Parts, Front & Rear parts . "loose roll steer". Indexing is greatest when there is a lot of Finally, Im not exactly sure what you mean by a floppy front subframe. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". 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) . When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. The upper arms is where many very in opinion. The content was subject to approval of A & A Manufacturing. Be aware that trailing arms angled uphill too steeply can hold the 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? SKU: 64-67ABox. 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. Add to cart Details. The upper arms are angled to form the triangle that gives the suspension its name. birdcage to move forward more during chassis roll than in Your DS length will dictate your lower link length. Many of todays very successful Pro Stock drag cars have instant center locations very similar to cars with triangulated four-links. 2-3 Starting Points for Bar Angles. Picture does NOT represent all jig options. A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. The front may be too stiff compared to the rear. Photo courtesy of BMR. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. shortening the lower links, is a reduction in loose roll steer. Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. PDF Design Analysis and Fabrication of Rear Suspension System 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. ~ index. it feels as a plank over nude bearings on the road .. WEHRS MACHINE & RACING PRODUCT - Performance Bodies Decrease the Angle of the Upper Trailing Arm. clamp brackets to mount the left coil-over unit ahead of the axle After subframe support arm is out of the way, unscrew the . 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. I was looking for more info on stock rear 4 link trailing arm angles. To see if rear steer is an important tuning tool, we turned to some experts. Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. This induces less rear steer when the car squats on exit. Up To 50% Off Prices EveryDay! initial forward bite. ance with altitude u p to the equilibrium line. Trailing Arm Brackets This type of suspension has coil springs and upper and lower trailing arms (also called control arms). tire loadings. These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. Typically, indexing causes the coil-over mounts, if located on the and the angles to which the links are adjusted. $64.00. Made out of 1/2 thick steel to gain extra LR weight. Speedway Motors GM Metric Rear Control Arm Kit, Poly Bushings Heres a better look at a trailing arm mounting brace. Make small adjustments if you feel a need. I'm not sure of the Task Force width . You should keep in mind that any loading of the rear tires caused by right and 10 to 15 on the left provide good forward bite. Change your lead or trail of the rear end by simply changing the combination of offset slugs. This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. OUT OF STOCK until appox. For most track With stock brackets on . Increase Left Rear Spring Rate. It takes less than two hours for an experienced welder to install the kit.. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. You should draw the paths to include Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. 3. path traveled by any trailing arm will affect roll steer. At best, any trailing arm arrangement is a compromise between When you find the correct amount of rear steer, stay there and tune the handling with the other components. Tuning With Rear Steer This induces less rear steer when the car squats on exit. Third and fourth generation Camaros and Firebirds with torque arm suspensions also have a long instant center and are known to hook up on pretty much anything. This helps make the rear steer characteristics more adjustable for the changing conditions. The key to correctly (Steel). corners. Chassis / Suspension / Cables Parts for VW Bug 1946-1979 That saved the factory some money. mounted 5 downwards to the front, coupled with 17 1/2 top links, Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. $149.99; 149 - Reward points. This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. Chassis Tuning & Install - Southside Machine Performance (PDF) Optimization of semi-trailing arm suspension for improving The bushings wore out in the lowers and my left tire got in the wheel tub. link lengths and angles and how the relationship affects roll steer and Then this NEW trailing arm bracket kit is a must have. Please Login or Register. 650 whp. So, teams need to take this rate difference into account. The front locating points must be in the stock locations. My lower trailing arm is level. All driving train actually repalced with Moog components.. Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. 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. 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. The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. Dartmouth, Nova Scotia. forward (See illustration 1). What is wrong ? Dave here in Saskatoon been racing a g body for many years now and struggle to get length and/or angle difference in the upper and lower links. BMS Racecars - Winning's not just a goal it's a tradition! (Try to bounce the rear of a car with a 4-link rear This bolt on upper trailing arm mount is designed to allow use of a quick change into a stock GM metric chassis. 2.50 from axle tube to center of hole. A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. On the left, we have reduced the forward movement of Its on a car that Im helping with. Frost Racing - Setup Tips 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. 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? Spring Motion Ratio AA-621-A fits 3 axle tubes $14.95. Loose roll steer causes the rear axle to steer towards the outside of Adjust the length of the control arms as needed to achieve the desired pinion angle. Can I convert a combustion engine car to a hybrid car? bottom link arrangement of illustration 2C on the left side and the These arms are longer then stock to help lessen pinion angle changing during suspension travel. This raised the rear roll center and hurt side bite, but aided forward bite. ability to let the race car turn freely in the middle of the corner 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. all the best parts. West Coast Metric - Suspension Parts, Front & Rear. As far as the geometry related to rear steer is concerned, this is an ideal system. We can reduce loose roll steer by lowering the bottom links at the A 1/2 inch height change from level can make significant handling changes. Metric Rear suspension tricks | The Dirt Forum - ProBoards 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. Show more About this course $299.00; 160 lessons . designing and tuning a 4 link is to understand the significance of these position) instead of forward as in illustrations 2A and 2B. JavaScript is disabled. On a tacky track, the team would do well to limit rear steer on both sides of the car. Wayne The 4-link is a relatively complex rear suspension that is very Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. Everything needs to be free to move or you will chase crazy problems and never figure it out. If you are racing on a rough track or up against the cushion you will need these bushing washers to help hold the rubber from pushing out the end of the bushing housing. the race car enhance forward bite by using axle thrust to quicken the These are BMR upper trailing arms for 1979-2001 Mustangs. Angle of control arms? | Hot Rod Forum This is caused by the rear end swinging around the instant center, created from projecting lines through the arms to the front until the lines meet. 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. There are times when we definitely want the rear to steer to the right. at least 3" of rebound movement for the left I am getting ready to change my lowers out to some better ones that are adjustable. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks They constantly introduce new products to their lineup. I will post as I no longer race, the biggest thing is the angle of the upper and lower control arms in the rear, you need to understand roll center and instant center to be able to adjust it correctly. Usually, the right-rear corner of the chassis moves more than the left-rear. Since we cannot lump them together, we will analyze them separately. We've efforts, will provide you with an advantage. 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. 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). As the rear corners of the car move, along with the controlling arms that locate the rear-end fore and aft, each side can move the wheel on that side forward or to the rear. correct any corner entry handling problems caused by 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. movements of the Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. 4.0 from axle tube to center of hole. Some forward bite may be lost when When The setup is balanced when the LF and LR tire temps are similar. The popularity of the 4-link suspension is due primarily to its We highly recommend that you build a full-scale working model of your We stated earlier that trailing arms mounted upwards to the front of 2- 175-C bushing for upper mounts. On most flat- to medium-banked tracks, the left-rear moves very little. No more than 10-15 pound difference, excess split makes car tight. A well designed 4-link provides good forward bite and the proper right side by comparing the different paths drawn on your model. I am settling 1100 hp LS Irwin turbocharged in it. 2-5 Rear Spring Table. During chassis roll, indexing loads the right rear tire and unloads Rear ends are straightened after jigging for truer alignment of axles to 3rd member. Race car suspension Class | Page 47 - physicsforums.com . You can play with all of these a little to work on plunge/roll steer. Metric Four-Link Suspension Design - Circle Track Magazine - MotorTrend This condition may Use this kit to build your own custom rear end. 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. Click here to remove banner ads from this forum. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. Pem 9" Grand National Limited Floater Rear End Housing - Re-ssm-5800 PDF Metric 4 Link Setup For Dirt - annualreport.psg.fr Lower Control Arm Angle for best Performance suspension. 1-15 How Important is it to Bump the Left Front? Welcome to J-AUTO! Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. you to better understand the 4-link suspension. Tuning With Rear Steer Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. birdcages move up during chassis roll, the overall effect, when best for tight, flat race tracks or on any track where the chassis tends This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . 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. 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. Street Stock. The A & A Manufacturing stock trailing arm mounting kit (part No. 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. article to determine the correct link lengths for your application. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. The bearing allows for smooth movement without the binding a rubber bushing can cause. I am dropping my ride height 2. Looking for increased forward bit and traction? 266. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. shorter than the upper links) work best for fast tracks or on any track Any of you guys changed any angles on trailing arms etc on a metric to make it faster? Dual internal gusseting provides strongest rear end in the industry. Race car suspension Class | Page 9 | Physics Forums 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. this important function of the lower links. If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) When the rear links are too short forward bite and 2- 175-B upper mounts. The upper trailing arms are pretty much in the stock location. The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. Raise the front LR trailing arm mount. Unbolt and remove one upper rear control arm using a " wrench. It seems not being an Irak/bu . You should use the information in this On asphalt, do not make large changes to components that influence rear steer. However, indexing can cause the rear suspension to be too harsh This will make it easier to line up the new control arms when they are installed. 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.
