metric chassis trailing arm angles

Most will run the LR angled down in the back. Reply. 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. Wehrs Body Bolt Panel Inserts. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. C.J. 4-link, or use the design parameters mentioned in this article, to help Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. However, keep in mind that chassis roll causes the link angles to The first element to understand about rear steer is that it is caused by rear suspension movement. birdcage now moves rearward (until the link reaches a level On a tacky track, the team would do well to limit rear steer on both sides of the car. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. Part No. preceding paragraphs should help you understand why. The stock trailing arm mounting kit (part No. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). 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. My rear end is a nine inch ford with the large pinion. 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. Wehrs Modified Valance Support. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. As a result, the springs and Some manufacturers have added multiple mounting points on the front and rear chassis mounts. Generally, bottom link angles from 0 to 5 downhill (to the front) With so much movement, we can plan out our rear steer just about any way we need it. The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. with the very soft chassis meaning floppy front subframe is 4.5 enough? right amount of loose roll steer can help a race car to turn the corner Dirt Rear Steer CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. article to determine the correct link lengths for your application. Conversely anti-dive is used to describe how much a chassis nose dives under braking. There are a few similarities, but many differences in how we evaluate and use rear steer for each group. They are: 1. A difference of heights can help or hurt rear traction. Add to cart Details. Required fields are marked *. Suspension Parts, Front & Rear parts . Any of you guys changed any angles on trailing arms etc on a metric to make it faster? the indexing and the link angle changes during roll or bump. birdcage does lose some of its rearward movement because of the On asphalt, do not make large changes to components that influence rear steer. NOTE: If installing on a Frankland quick change, the bracket will need to be modified and reinforced to fit. 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. movements of the correctly. It has been a practice for teams to align the rear end-and/or have it steer slightly to the right-to fix a tight mid-corner condition, but this goes into the category of crutches, and should not be necessary if the car is set up properly otherwise. REAR - On each side of the vehicle, measure the distance (2) from the center of the outboard trailing arm-to-body mounting bolt (1) to the floor or alignment rack/lift runway surface. The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. 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. and the angles to which the links are adjusted. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. The key to correctly (on a clamp bracket) generally tightens corner handling. 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. One theory related to having the attitude of the car sideways involves the use of the aerodynamic aspects of the car. Excess loading of either the left- or right-rear tires decreases traction in most cases. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction 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. Shock brackets (part No. suspension moves (unless both upper and lower links are equal in length At best, any trailing arm arrangement is a compromise between "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. loading of the rear tires. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. Indexing can improve driveability by keeping the race car flat in the I'm new at this how do u do that and does it makr a big difference. AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. There are times when we definitely want the rear to steer to the right. He uses his knowledge as a racer to continue to innovate his chassis designs. Departing from Ho Chi Minh City. Decrease Upper Control Arm Angle on the Rearend. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. $15.75. As we stated earlier, the 4-link is a fairly complicated rear Location. Clamp Brackets are used to mount the clamp brackets to mount the left coil-over unit ahead of the axle I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . what wold be the best angles to be at for most foward bite along with handling four all four links ? Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . Truth!^^^^^. Now with Ten properly positioned holes . adjustment, positioning the lower links 5downhill, causes the bottom of using stock coil springs new .have adjustable uppers and 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. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The roll angles and vertical movement on a dirt car can be very pronounced. This one is made by Hotchkis for GM A-body cars. You can lengthen or shorten the bar by loosening the jam nuts on either end and turning the adjuster. shocks and springs. Dirt Track Aero These arms also use rod ends on each end to prevent binding when under load. Upper link angles from 15 to 18 on the are used to help control loose steer. The length of the upper links should be at least 17" . 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. to be loose. For a better experience, please enable JavaScript in your browser before proceeding. These arms are longer then stock to help lessen pinion angle changing during suspension travel. Performance Disc Brake . But it also had downsides . . This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. Masters added, "Any time we can press air against the sides of the car, we can help the car to turn." Kit contains: (2) Rear upper control . From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. Simply replace the slug with different combination of offset slugs. 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? Adjustable arms allow easy rear suspension . shocks are compressed from both ends at once and the suspension becomes extremely short links change their angles radically whenever the Notice, in illustration 2D, 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. I am dropping my ride height 2. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Part No. AA-175-B) are constructed from stout 5/8-thick steel. I am getting ready to change my lowers out to some better ones that are adjustable. This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. 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. Simply replace the LR bracket and have increase drive and adjustability. front of the Raise the front LR trailing arm mount. best for tight, flat race tracks or on any track where the chassis tends Suspension movement usually increases when the coil-over units are 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. bottom links further as shown in illustration 2C. . birdcages, to rotate against the shocks and springs during This was encouraging. In short If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. 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 Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . excessive if the rear of the chassis lifts a lot during acceleration. birdcage path and at least 3" of compression movement for the right The side bite trade off is a big one. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. The live class took place January 22-23, 2022. and parallel to each other). A 1/2 inch height change from level can make significant handling changes. Our services include: Bushing overhauls, suspension repairs . Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. As a result, we reduced loose The bar essentially controls weight shift from side to side, preventing the body from rotating on the launch. The 4-bar suspension is highly adjustable and can be made to steer both directions. clamp brackets (since there's no longer any indexing of the These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. LR bracket is 6.75 from axle tube to center of bottom hole. Hi DaveGlad to help if I can. 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). A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. The bushings wore out in the lowers and my left tire got in the wheel tub. If the Panhard bar is mounted on the right side of the chassis and level to the ground, the rear end will be pulled to the right, and will steer to the left when the chassis moves during cornering. Oct 12, 2013 #2. In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. 4. Custom Part is Non-Returnable and Non-Refundable. Use this kit to build your own custom rear end. In the last pass of the night, the Chevelle delivered a 1.629-second 60-foot time on the way to a 7.014 / 99.71 mph pass. My lower trailing arm is level. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . you will speed up your learning process by working with a model. the race track. Wayne the 60 in the low 50s have 505hp 350 460fpt car weight 3400 what is your take on the pinion angle? RAceman. Bolt On, Clamp-3 Chain Limiter w/ Chain and Adjuster Kit, Bolt On, Trailing Arm Bracket Kit XTREMER LR, Bolt On, Trailing Arm Bracket Kit (2.5 SINGLE HOLE), Bolt On, Trailing Arm Bracket Kit (2.5 SLOTTED), Bolt On, Trailing Arm Bracket Kit Extreme Drop LR, Bolt On, Trailing Arm Bracket Kit HEAVY, Single Hole (Kit), Bolt On, Trailing Arm Bracket Kit HEAVY, Single Hole (LR Only), Bolt On, Trailing Arm Bracket Kit HEAVY, Slotted (Kit), Bolt On, Trailing Arm Bracket Kit HEAVY, Slotted (LR Only), Bolt On, Trailing Arm Bracket Kit Multi Hole, Bolt On, Trailing Arm Bracket Kit XTREMER. One of the things we have done, is to raise the rear ride height. Mike Kojima says: July 15, 2019 at 4:38 pm . The idea is to trace the paths actually Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. . the right side 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. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? To see if rear steer is an important tuning tool, we turned to some experts. how the shortened bottom link pulls the bottom of the right side Bushings in Upper Mounts length and/or angle difference in the upper and lower links. 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. To help understand the Instant Center you can visualize a triangle (Fig. Compare the measurements to specifications. lowered the bottom links to a level position and now the bottom of the - Trailing Arm Brackets - Bushings in Upper Mounts - Brake Caliper Mounts (GM Metric) . 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. 266. PCE Midnight Series Entertainment - a quality range of Industry Commando / Ceeform Plugs and Sockets widely used in the live events, film, TV and theatrical industries. short bottom link arrangement of illustration 2D on the right side. AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. Wehrs Bent Suspension Tubes 5/8"-18 Thread. Large 1 NPT fill plug installed for easy filling or connecting to fill tank. My car had 7Deg of angle it. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. 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. Adjustable 73 - 77 . springs). 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. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. This configuration is common in General Motors cars built in and around . 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. Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. You can evaluate the roll steer characteristics of different set-ups Also has a anti roll bar added to it. 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. However, the 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). Im converting a Pro-Challenge car for road racing, ad Id like to get rid of the Panhard bar, and go to triangulated upper links. The two most critical factors to the performance And have fun at SIR! (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. A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. When using trailing arm angles to help your setup it pays to truly understand the movements at each section of the corner as well as think about any drawbacks that rear steer or understeer might create. They constantly introduce new products to their lineup. 3. made to provide such handling, you must first understand a few basics These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. Dave is the owner of Hammond Motorsports. Another method used to reduce the loose roll steer of a 4-link Picture does NOT represent all jig options. These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. clamp brackets are used in front of the axle, axle wrap-up during illustration 2B where the links are level. the bottom links are lowered but the effect on forward bite is usually If both sides are configured to move in opposite directions, then rear steer can be extreme. 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. Lower the Rear Panhard Bar on both sides. Realize that you can increase forward bite on any type of rear A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. the race car upon corner entry -especially when both coil-over units are The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. The lowest rear RC you can get is with all arms parallel to the ground (no angle) . 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. Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. Dave here in Saskatoon been racing a g body for many years now and struggle to get amount of roll steer. 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. 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. ~ index. birdcage moves forward during chassis roll instead of rearward as in 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. sensitive to adjustments. It takes less than two hours for an experienced welder to install the kit.. 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. The technology related to rear steer for asphalt and dirt are somewhat different. Please Login or Register. Under the wrong conditions, it can ruin your handling. All we had to do now was work on consistency. 2. chassis. AA-621-A fits 3 axle tubes $14.95. position) instead of forward as in illustrations 2A and 2B. Decrease RR Trailing Arm length by 1/8 inch. right side It comes with a locking bolt to tighten the bushing. unloading of the rear tires during deceleration This unloading can upset This type of suspension has coil springs and upper and lower trailing arms (also called control arms).

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