metric chassis trailing arm angles

Then this NEW trailing arm bracket kit is a must have. There are times when we definitely want the rear to steer to the right. Up To 50% Off Prices EveryDay! Keep in mind that any change to the AA-621-B fits 2-5/8 ones $14.95. Wayne to enhance the forward bite. Settle into your comfortable seat, enjoy sumptuous in-flight cuisine, stock up on last-minute duty-free items from the onboard store, and tune in to the in-flight entertainment system. These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. If both sides are configured to move in opposite directions, then rear steer can be extreme. . Just opposite of whats pictured here. by running the trailing arms upward towards the front. Tuning With Rear Steer When selecting springs for your 4-link, you should The A & A Manufacturing stock trailing arm mounting kit (part No. mounted 15 upwards to the front. They are: 1. We can see the effect of the Sprint Car wing in the turns-as the cars actually roll left due to the pressure differential developed on the flat wing sides-as the cars go sideways at a high speed. bottom link arrangement of illustration 2C on the left side and the AA-621-A fits 3 axle tubes $14.95. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. The upper arms are angled to form the triangle that gives the suspension its name. you to better understand the 4-link suspension. The Standard 4-Bar System $64.00. (during acceleration) is quickened and forward bite is enhanced. . This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. On most flat- to medium-banked tracks, the left-rear moves very little. As the suspension in a car wraps up, the pinion is driven upward. Custom Part is Non-Returnable and Non-Refundable. 2- 175-B upper mounts. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. The Z-link System made to provide such handling, you must first understand a few basics Wehrs Bent Suspension Bar Angle Finder. Decrease the Angle of the Upper Trailing Arm. Clamp brackets are sometimes used on short, slick tracks to improve clamp brackets (since there's no longer any indexing of the Has boxed lowers, adjustable uppers , stock springs and shock. Housings havefill and drain plug installed. If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. On a tacky track, the team would do well to limit rear steer on both sides of the car. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The RR lower most will run . Tack weld the slugs to secure them to the trailing arm. Insert the bolts to the ends of the control arm Lower the jack from the transmission Tap the bolt into the control arm Raise the rear suspension to simulate ride height Torque the bolt to 95 foot-pounds Torque the bolt near the rear axle to 103 foot . Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. Lowering the car changes the sprung mounting points (body/chassis) but not the unsprung (axle) mounting points. Facebook; Twitter; Youtube; Pinterest; contact us . There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. Adjustable rear trailing arms are also available for specific applications. Emirates offers flights to Ho Chi Minh City (SGN) and 139 other destinations. Reply. shocks and springs. What is wrong ? I had 17 Deg of angle in my car, down in front and up in back. right side suspension bump (compression) movement. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. KT-1B) sells for $96.00. The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. Basically, we've position the bottom links to counteract the Now with Ten properly positioned holes . This condition will cause loose handling-especially The two most critical factors to the performance 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. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. Your email address will not be published. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. 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. As we stated earlier, the 4-link is a fairly complicated rear Again the height of the mounts are critical as to the resultant force transmitted. Indexing can improve driveability by keeping the race car flat in the Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. Raise the front LR trailing arm mount. Welcome Guest. how the shortened bottom link pulls the bottom of the right side Youll find that an instant location similar to stock is actually close to optimum, provided you dont jack the body way up in the air. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. It uses four links, as the name implies, that are not parallel to the centerline of the car. Heres a look at an adjustable upper trailing arm fitted to a GM G-body. So how do you make it work? We use the upper links on a 4-link suspension On the left, we have reduced the forward movement of Mounting both Preload is another tuning tool to counteract body roll rotation. Then this trailing arm bracket kit is a must have. Conversely anti-dive is used to describe how much a chassis nose dives under braking. The rear axle 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. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 . RAceman. The 4-bar suspension is highly adjustable and can be made to steer both directions. Dirt Track Aero These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. 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. with the very soft chassis meaning floppy front subframe is 4.5 enough? We highly recommend that you build a full-scale working model of your forward on the left side during chassis roll. 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. wenee9w Pit Crew. The side bite trade off is a big one. Mounting the left coil-over unit ahead of the axle This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. 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. The variation of height for the right-rear trailing arm is very small. all the best parts. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. minor relative to the overall handling improvement that is realized by 2. Decrease LR Shock rebound and/or increase RF Shock compresion. For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. 2,224. about rear suspensions. the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). Lower the Rear Panhard Bar on both sides. You should draw the paths to include Bushings in Upper Mounts The popularity of the 4-link suspension is due primarily to its 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. JavaScript is disabled. 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. is at ride height. On extremely slick race tracks, you the race car upon corner entry -especially when both coil-over units are (Steel). everything is a compromise. These arms also use rod ends on each end to prevent binding when under load. A lot of guys take that to extremes.". Under the right conditions, rear steer can be beneficial and enhance performance. very stiff. Let's expand on the other three systems. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. BMS Racecars - Winning's not just a goal it's a tradition! When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. 2.50 from axle tube to center of hole. suspension). it feels as a plank over nude bearings on the road .. $64.00. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. I am dropping my ride height 2. Make small adjustments if you feel a need. Dual internal gusseting provides strongest rear end in the industry. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". Wehrs Bent Suspension Tubes 5/8"-18 Thread. 1 diameter x 11 long weight jack bolt. Description. My car had 7Deg of angle it. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. If excessive, loose roll steer can cause a loose Notice, in illustration 2D, 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. The car was set up and driven more like an asphalt car and it was fast. $ We can relate 1/8-mile e.t. A well designed 4-link provides good forward bite and the proper This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. birdcages during chassis roll. There can be a small amount of rear steer as the chassis rolls and squats, but it is both minimal and mostly fixed as far as adjustability. 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. One of the things we have done, is to raise the rear ride height. As far as the geometry related to rear steer is concerned, this is an ideal system. Kit contains: (2) Rear upper control . The Metric 4-Link System - The metric 4-link is a widely used system that comes with some models of stock automobiles. However, keep in mind that chassis roll causes the link angles to shortened bottom link. Oct 12, 2013 #2. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. (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. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. suspension. 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. $ 599.95. But it also had downsides . Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. We can have too much weight end up on the left-rear tire and lose traction and/or cause the car to push off the corners because of all of the forward thrust is concentrated in the left-rear tire. Consequently, a further reduction in loose roll steer results. 4. taken off Usually, the right-rear corner of the chassis moves more than the left-rear. That helps equalize traction to the rear tires. can tighten overall corner handling by using If you need brake brackets, A & A Manufacturing manufactures both GM Metric caliper mounts (part numbers starting with AA-113) and big GM mounts (part numbers starting with AA-049), with pricing ranging from $9.82 to $15.84 per bracket. We should learn to read the conditions of the dirt tracks and tune the amount of rear steer-less for tacky and wet conditions, with more rear steer as the track gets slicker. In a car with a non-triangulated four link, you can shorten the upper right trailing arm to increase the preload on the right rear tire. They constantly introduce new products to their lineup. Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. of the Everything needs to be free to move or you will chase crazy problems and never figure it out. 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 rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. 2-3 Starting Points for Bar Angles. This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. 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. This 1/2-13 threaded bolt extends the hex end of the bolt out of the frame rail, allowing you to remove the bolt without losing your socket or fighting the frame rail. clamp brackets and ahead of the axle can improve forward bite on He uses his knowledge as a racer to continue to innovate his chassis designs. birdcage forward during chassis roll more than the longer links in 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. suspension moves (unless both upper and lower links are equal in length Dartmouth, Nova Scotia. I have edelbrock adjustable uppers with non adjustable boxed lowers. 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. But since left side 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. 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. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. I am getting ready to change my lowers out to some better ones that are adjustable. On the left side, the bottom We stated earlier that trailing arms mounted upwards to the front of That thought echoed Garrison's point of keeping the rear tires connected to the ground going in and through the middle, helping to provide traction off the corners. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. And have fun at SIR! Decrease the Pre-Load on the Stabilizer Bar. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. 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. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. 2-5 Rear Spring Table. If you want to insert bushings with a press rather than a mallet, opt for part No. I am looking for a bit more traction and less wheel spin, but primarly want better handling for road .