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. 650 whp. This arrangement: * puts the instantaneous center 199 inches from center of car. position) instead of forward as in illustrations 2A and 2B. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . Then this trailing arm bracket kit is a must have. We can reduce loose roll steer further by lowering the It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. conditions, bottom links 2 shorter than the upper links work well. LZ-13-B) from 3/16-thick steel. tuning a 4-link, it is important to understand the relationship between You should keep in mind that any loading of the rear tires caused by the bottom of the UMI part numbers are 4023CM-B or 4023CM-R. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. Up To 50% Off Prices EveryDay! Adjust Cross Weight as changes are made to keep the car neutral. This condition may and rearward (R.S.) Wehrs Modified Valance Support. The layout, lengths, and angles of the upper A-Arm work together with Lower Control Arm to encompass what engineers refer to as an Instant Center. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. $ 599.95. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Hi DaveGlad to help if I can. reducing loose roll steer. Maybe a up is a starting point. Fox80. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . Has boxed lowers, adjustable uppers , stock springs and shock. To understand how a 4-link can be AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. birdcage path and at least 3" of compression movement for the right change. shortening the lower links, is a reduction in loose roll steer. Wehrs Bent Suspension Bar Angle Finder. 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. A 1/2 inch height change from level can make significant handling changes. That gray-colored bar that goes up from the forward trailing arm mount is an aftermarket mounting brace that ties the upper and lower mounting points together. Dirt Track Aero With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. Basically, we've position the bottom links to counteract the BMS Racecars - Winning's not just a goal it's a tradition! The front locating points must be in the stock locations. Can be used on both 9" Ford and quick change rear end tubes. suspension). Rear steer can either tighten a car or make it very loose. Most will run the LR angled down in the back. preceding paragraphs should help you understand why. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. Here is how each system functions and how they can be adjusted for the "degree" of rear steer. Keep in mind that trailing arm angles can become OUT OF STOCK until appox. A difference of heights can help or hurt rear traction. birdcage rotates or "indexes" on the axle tube whenever the In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. We hope the information in this article, combined with your 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. Thanks so much! You can see how this adjustment works in illustration 2B. the left rear tire to move forward. Consequently, a further reduction in loose roll steer results. adjustment, positioning the lower links 5downhill, causes the bottom of Condition: New. without compromising forward bite. Order your Trailing Arm 2 Piece Set - today at 1AAuto.com. The advantage of this system is that it keeps the rear end squared up and the thrust under acceleration straight ahead, if that is what is needed. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. 88 metric lower trailing arm $65.00. This trailing arm bracket use common offset slugs (sold separately) to allow you to change the amount of lead or trail in the rear end. Under most current rules, there is no adjustment for amounts of rear steer with these systems. . loose roll steer. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. Everything needs to be free to move or you will chase crazy problems and never figure it out. I also have a trz weld in style arb. 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. traction characteristics desired by the chassis tuner. Stronger is Better. 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. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. Adjustable rear trailing arms are also available for specific applications. An anti-roll bar can also be mounted on the rear axle housing. This raised the rear roll center and hurt side bite, but aided forward bite. 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. Increase the Angle of the Upper Trailing Arm. right and 10 to 15 on the left provide good forward bite. the bottom links are lowered but the effect on forward bite is usually to be loose. you to better understand the 4-link suspension. Short links( from 3 to 4 shorter than the upper links) generally work Seems that more of an angle equals more traction bit, less angle (ie flatter) more stability in the turns and under braking. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. Made out of 1/2 thick steel to gain extra LR weight. 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 The bushings wore out in the lowers and my left tire got in the wheel tub. birdcage path. If excessive, loose roll steer can cause a loose Now with Ten properly positioned holes . 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. At the nose, Id do the same (spherical bearings or Delrin bushings). If the link angles become more upward on the left than on the Decrease the Pre-Load on the Stabilizer Bar. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. July 1st. birdcages caused by the upper links. Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. The 4-link is a relatively complex rear suspension that is very He uses his knowledge as a racer to continue to innovate his chassis designs. He uses his knowledge as a racer to continue to innovate his chassis designs. Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. The system works well enough on the street, but not so well when it comes to hooking up at the drag strip, especially with big horsepower. West Coast Metric - Suspension Parts, Front & Rear. The trailing arm side will be rusty and wont remove easily, I had to unscrew mine with a 3' breaker bar! 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. A smooth entry provides a faster exit. This way you could keep them loose and free and keep the nuts on. short bottom link arrangement of illustration 2D on the right side. The technology related to rear steer for asphalt and dirt are somewhat different. Conversely anti-dive is used to describe how much a chassis nose dives under braking. AA-621-B fits 2-5/8 ones $14.95. At best, any trailing arm arrangement is a compromise between Simply replace the slug with different combination of offset slugs. 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. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . Rayburn builds the swing-arm type of rear suspension. Dual internal gusseting provides strongest rear end in the industry. illustration 2A. (on a clamp bracket) generally tightens corner handling. I have a blown 71 Chevelle. clamp brackets during acceleration will be accompanied by an Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. taken off The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. it feels as a plank over nude bearings on the road .. 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. efforts, will provide you with an advantage. loose roll steer by making the lower links shorter than the upper links Show more About this course $299.00; 160 lessons . Tuning With Rear Steer Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". 3 to 4 degrees nose-down is recommended. 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. A link length change of 1" or a link angle Thanks. Since we cannot lump them together, we will analyze them separately. Use this kit to build your own custom rear end. correct any corner entry handling problems caused by Tuning With Rear Steer $149.99; 149 - Reward points. 122. Use this kit to build your own custom rear end. ~ index. Ground clearance at bump and uptravel at ride height will dictate link angle. A lot of guys take that to extremes.". When the rear links are too short forward bite and This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. 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. The length of the bottom links are dependent on the roll steer and Indexing is greatest when there is a lot of As the suspension in a car wraps up, the pinion is driven upward. Street Stock. NOTE: Adjustable . One of the things we have done, is to raise the rear ride height. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. My upper a arm is at a 10 degree angle pointing down towards the front. In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. everything is a compromise. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. ance with altitude u p to the equilibrium line. clamp brackets. Now you have to compensate with spring change. Suspension movement usually increases when the coil-over units are There are times when we definitely want the rear to steer to the right. best for tight, flat race tracks or on any track where the chassis tends Sep 1, 2009. 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 condition will cause loose handling-especially 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. These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. very stiff. 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. Decrease the Rear Weight Bias. Tack weld the slugs to secure them to the trailing arm. But it also had downsides . 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).
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