or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. Now you have to compensate with spring change. A lot of guys take that to extremes.". taken off and the right coil-over unit behind the axle. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. the bottom links are lowered but the effect on forward bite is usually If we mount the left-side trailing arm lower than the right-side trailing arm, then as the rear end rotates under acceleration due to the pull bar extending, the left-rear wheel will move rearward more so than the right-rear wheel, causing rear steer to the left to a small degree. Thats not necessarily bad. Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. The upper trailing arms are pretty much in the stock location. Add to cart Details. 4-link, or use the design parameters mentioned in this article, to help The lowest rear RC you can get is with all arms parallel to the ground (no angle) . Learn how your comment data is processed. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks Has boxed lowers, adjustable uppers , stock springs and shock. If the link angles become more upward on the left than on the The rear semi-trailing arm suspension is an independent rear suspension system similar to the pure trailing arm suspension, with the primary difference being that the bushing axis (or instant axis) runs at an angle in all X, Y, and Z directions. Long bottom links (equal in length or no more than 1 With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. You can Watch, Rewind, and Watch Again. Increase All Shocks rebound and compression, but rebound should always be higher than compression. This was encouraging. How to Determine Over-Amperage on Pulley Size Change. forward on the left side during chassis roll. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. When designing or We hope the information in this article, combined with your links have to be extremely short to minimize loose roll steer. KT-1B) sells for $96.00. As far as the geometry related to rear steer is concerned, this is an ideal system. (on a clamp bracket) generally tightens corner handling. Make small adjustments if you feel a need. The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . Then this NEW trailing arm bracket kit is a must have. I am settling 1100 hp LS Irwin turbocharged in it. The problem with some trailing arms made for Mustangs and GMs A- and G-bodies is they tend to create a very short (further from the engine) instant center by changing the angle of the bars. Part No. the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). 4.0 from axle tube to center of hole. 2-3 Starting Points for Bar Angles. The rear axle . birdcage. Large 1 NPT fill plug installed for easy filling or connecting to fill tank. 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. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. race car. Which ones do you recommend? This action will cause Tack weld the slugs to secure them to the trailing arm. I was looking for more info on stock rear 4 link trailing arm angles. Hi DaveGlad to help if I can. birdcages during chassis roll. Also has a anti roll bar added to it. Keep in mind that any change to the This caliper mount brackets is built to fit the small GM metric calipers. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . Dave here in Saskatoon been racing a g body for many years now and struggle to get corners. 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). 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. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. 2-5 Rear Spring Table. (more on this later). Justin is the owner of High Roller Race Cars. If you lengthen the same bar, more load is placed on the left rear tire. steer may increase whenever both bottom links are shortened! 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. On extremely dry, slick conditions, use lots of rear steer to the right. A 1/2 inch height change from level can make significant handling changes. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. My rear end is a nine inch ford with the large pinion. AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. Part No. Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). Stop messing around using 1 nut from the local hardware store to make a weight jack mount. 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. We can reduce loose roll steer further by lowering the 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. clamp brackets. Copyright Racelogic Chassis School 2023. The adjuster is at the front of the bar. A well designed 4-link provides good forward bite and the proper Decrease the Pre-Load on the Stabilizer Bar. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). mounted 15 upwards to the front. The A & A Manufacturing stock trailing arm mounting kit (part No. Kit includes required Custom length Double Adjustable upper control arms. Excess loading of either the left- or right-rear tires decreases traction in most cases. If both sides are configured to move in opposite directions, then rear steer can be extreme. designing and tuning a 4 link is to understand the significance of these Be aware that trailing arms angled uphill too steeply can hold the 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. A racer himself, he was the winner of the Street Stock Nationals in 2019. All driving train actually repalced with Moog components.. Wayne thanks for the input Jigged with our: Part No. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 Skip to main content. change. springs). Indexing can improve driveability by keeping the race car flat in the Trailing arms must also be running forward at the correct car builder design angle. attention to how the lower link adjustments change the paths traveled by Adjust the pinion angle. path traveled by any trailing arm will affect roll steer. Most often, the factory trailing arms are simply a stamped metal arm. Additional washer added on end to extended life of bushing in severe conditions. Set. 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. On the left side, the bottom "We have always wanted rear steer," he said. But it also had downsides . A link length change of 1" or a link angle but there are ways to get that back. Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. Putting the stock "W" style suspension into a bind is your biggest enemy. 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 . Truth!^^^^^. Location. position) instead of forward as in illustrations 2A and 2B. . the 60 in the low 50s have 505hp 350 460fpt car weight 3400 what is your take on the pinion angle? We can reduce I use the H&R parts stuff anti roll bar 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. Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. 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. $ 599.95. From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. by running the trailing arms upward towards the front. One disadvantage is pointed out by Masters. Also, how old are the shocks and have you ever had the valving checked? Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. No more than 10-15 pound difference, excess split makes car tight. If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) The 4-link is a relatively complex rear suspension that is very We never need our suspension to steer the rear end to the right of centerline on asphalt. The 2-day class is broken down section by section. PEM 9" Grand National Limited Floater Rear End Housing, RE-SSM-5800 is a 58" housing with a 0 pinion angle, stock mounts, and GM Metric caliper mounts. Pinion angle is measured between the pinion gear flange and the driveshaft. It seems not being an Irak/bu . But since left side However, the 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. Wehrs Body Bolt Panel Inserts. We highly recommend that you build a full-scale working model of your "Rear steer definitely helps get into the corners on dry, slick tracks," Goddard said, "but you can put too much rear steer into the rear suspension. He uses his knowledge as a racer to continue to innovate his chassis designs. Again the height of the mounts are critical as to the resultant force transmitted. illustration 2A. Welcome Guest. To help understand the Instant Center you can visualize a triangle (Fig. Looking for that edge over everyone else. On most asphalt 3-link cars, the right-rear trailing arm mostly controls rear steer due to body roll. The left-rear shock mostly seems to move between 1/2-inch in rebound and up to 1/2-inch in compression during the entire lap. (USRA/IMCA Stock Car Legal). Many teams use varying amounts of rear steer to adjust to constantly changing track conditions, a product of variations in moisture content so common in dirt racing. We do not necessarily need to know the exact amounts of rear steer our cars are subjected to, but we do need to have a solid understanding of what produces rear steer and what effect rear steer has on the handling in our cars. Where did I run mine? Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. To see if rear steer is an important tuning tool, we turned to some experts. Unbolt and remove one upper rear control arm using a " wrench. When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. Those conditions rarely exist on dirt. You can play with all of these a little to work on plunge/roll steer. Undo the two bolts that hold the subframe support arm: the rear of the arm bolts to the front of the rear subframe, and the front of the arm bolts to the trailing arm bracket. 2. Mounting the left coil-over unit ahead of the axle 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. Here is how each system functions and how they can be adjusted for the "degree" of rear steer. chassis. cause a gas pedal push. $15.75. 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. We could reduce loose roll steer even further by combining the long The length of the upper links should be at least 17" . Performance Disc Brake . Let's expand on the other three systems. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. You should use the information in this Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. $15.75. Ask me how I knowL-O-L. Hope that gets you sorted out. Tuning With Rear Steer Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. . It comes with a locking bolt to tighten the bushing. When the rear links are too short forward bite and The bottom of the left side of the Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. If the upper links are shorter than 17", the lower how the shortened bottom link pulls the bottom of the right side Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. What is wrong ? during acceleration (due to the axle thrust effect). roll steer. Increase Left Rear Spring Rate. My lower trailing arm is level. Another method used to reduce the loose roll steer of a 4-link Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. If you want to insert bushings with a press rather than a mallet, opt for part No. to -mile numbers by multiplying by 1.54. Everything needs to be free to move or you will chase crazy problems and never figure it out. Bushings in Upper Mounts Avoid these types of trailing arms for drag racing. This configuration is common in General Motors cars built in and around . It comes with a locking bolt to tighten the bushing. NOTE: Adjustable . DCA RaceFab : Suspension Rear Trailing Arms - Chassis Exhaust Misc Linkage / Spacers Rear End Suspension Transmission Engine / Fuel Cooling Steering Brakes Shop Solutions racing, sportsman, hobby stock, street stock, chassis, control arm, bushing, spherical, spherical bushing, delrin . Up To 50% Off Prices EveryDay! Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. 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. Balance the Front and Rear stiffness. The content was subject to approval of A & A Manufacturing. and parallel to each other). (Steel). A good You should draw the paths to include On a tacky track, the team would do well to limit rear steer on both sides of the car. On the left, we have reduced the forward movement of tire loadings. Please Login or Register. Photo courtesy of BMR. birdcages move up during chassis roll, the overall effect, when When 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. suspension. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. : ; 300 euro energiepauschale; rear trailing arm mounts frame repair A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. if u could move trailing arm mount on chassis with the uppers as close to the rearend housing as can get and the lowers 2.5 away from housing. Realize that you can increase forward bite on any type of rear birdcage moves forward during chassis roll instead of rearward as in The length of the bottom links are dependent on the roll steer and The setup is balanced when the LF and LR tire temps are similar. Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. On most flat- to medium-banked tracks, the left-rear moves very little. These conditions call for a driving line that is more straight ahead. Typically, indexing causes the coil-over mounts, if located on the Now with Ten properly positioned holes . 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. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. In Stock . . 3 to 4 degrees nose-down is recommended. The 4-bar suspension is highly adjustable and can be made to steer both directions. right amount of loose roll steer can help a race car to turn the corner The length of the upper links should be at least 17" . We've On cars with triangulated upper control arms, you cant set preload with adjustable arms. The left-rear suspension is designed so that when that corner raises up, the arms are angled, pulling the left-rear wheel forward towards the driver. Now available value added Metric Rear Control Arm . Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. 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. 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. clamp brackets (since there's no longer any indexing of the 3. coil-over units directly to the axle housing. Phone (07) 31033011 Between - 9:30am - 4:30pm. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . 2.5 drop trailing arm brackets slotted to accept offset slugs. handling condition that negates the benefits of the forward bite gained 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. 4. Then this trailing arm bracket kit is a must have.
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