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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. 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. Rethink Dirt: Advanced Dirt Track Theory | Hyper Racing The roll angles and vertical movement on a dirt car can be very pronounced. Trailing Arm Mounting Kit from A & A Manufacturing My rear end is a nine inch ford with the large pinion. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. race car. The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. The RR lower most will run . This induces less rear steer when the car squats on exit. Dartmouth, Nova Scotia. Also, how old are the shocks and have you ever had the valving checked? gained by running the trailing arms upward to the front of the race car. These trailing arm brackets use common offset slugs (sold separately) to allow you to change the amount of lead or trail in the rear end. The Impala spindles are the " hot set up " on a metric chassis. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). * puts the roll center 3.3 inches off the ground. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant illustration 2A. Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. Usually, the right-rear corner of the chassis moves more than the left-rear. Great info! When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. Generally, bottom link angles from 0 to 5 downhill (to the front) In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. Nissan Pathfinder Infiniti QX4 Rear Driver & Passenger Side Lower 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. You should keep in mind that any loading of the rear tires caused by For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. Adjust the pinion angle. For most track 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. Rear Suspension - Circle Track Supply, Inc. 2-3 Starting Points for Bar Angles. This action will cause made to provide such handling, you must first understand a few basics starting point for both links is 15 upwards (to the front). 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. Sep 1, 2009. and the angles to which the links are adjusted. Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. by comparing the different paths drawn on your model. The length of the bottom links are dependent on the roll steer and during acceleration (due to the axle thrust effect). You may be required to make chassis adjustments to Our services include: Bushing overhauls, suspension repairs . 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. right and 10 to 15 on the left provide good forward bite. 64-67 A-Body Adjustable Upper control arm mount WILD RIDES (USRA/IMCA Stock Car Legal). Allstar GM Metric Trailing Arms - JEGS High Performance Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. RAceman. Wayne Housings have fill and drain plug installed. 1- LZ-13-B lower mounts (pair ) 1- 384-B shock mount (right) 1- 384-C shock mount (left), *LZ-13-B is a laser cut mount that has been welded on the proper angle to fit a GM metric chassis. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . J-AUTO - Bushings, Suspension, Parts for Mazdas to be loose. Traxxas 9530: Suspension Arm, Front (Right), Black Part No. On asphalt, do not make large changes to components that influence rear steer. To see if rear steer is an important tuning tool, we turned to some experts. Thanks so much! Metric Four-Link Suspension Design - Circle Track Magazine - MotorTrend 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. With so much movement, we can plan out our rear steer just about any way we need it. Stronger is Better. Long bottom links (equal in length or no more than 1 Most often, the factory trailing arms are simply a stamped metal arm. Mounting the left coil-over unit ahead of the axle This one is made by Hotchkis for GM A-body cars. 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. Speedway Motors GM Metric Rear Control Arm Kit, Poly Bushings You can play with all of these a little to work on plunge/roll steer. The car was set up and driven more like an asphalt car and it was fast. Decrease the Pre-Load on the Front Stabilizer Bar. AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. Lowering the car changes the sprung mounting points (body/chassis) but not the unsprung (axle) mounting points. Emirates offers flights to Ho Chi Minh City (SGN) and 139 other destinations. excessive if the rear of the chassis lifts a lot during acceleration. Insane video on the induced rear roll over steer. Triangulated 4-Links: Make Your Stock Suspension Car Work You should use the information in this Anti-squat is a concept used to determine how much the rear of a chassis will squat under acceleration as a result of the rear geometry. The company manufactures the kits lower trailing arm mounts (part No. Wehrs Modified Valance Support. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ (Try to bounce the rear of a car with a 4-link rear Adjustable 73 - 77 . 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. about rear suspensions. Notice how this 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). 2-5 Rear Spring Table. I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. Wehrs Metric Trailing Arm Bolt. path traveled by any trailing arm will affect roll steer. GM Metric Trailing Arm Mounts - Lower - Hammond Motorsports 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. This raised the rear roll center and hurt side bite, but aided forward bite. 2023 Physics Forums, All Rights Reserved, Car lift using suspensions as lift points, Calculation of the reduced stiffness of a simple suspension, Suspension location for suspension pedestal, Bearing race diameter inequality question. A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. Performance Disc Brake . This induces rear steer when the car squats on exit. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. on rough race tracks. Metric Rear Suspension - Don Terrill's Speed-Talk 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. A smooth entry provides a faster exit. We can use the lower links of a 4-link suspension to help offset the birdcages typically move down much less than right side Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". The upper arms are angled to form the triangle that gives the suspension its name. this important function of the lower links. On a tacky track, the team would do well to limit rear steer on both sides of the car. This induces less rear steer when the car squats on exit. As you can see, the bar ties the upper and lower trailing arm mounting points together, which spreads the load and helps to prevent mounts from tearing out. It may not display this or other websites correctly. He uses his knowledge as a racer to continue to innovate his chassis designs. Bad shocks (and/or messed up valving) can be the culprit. 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. 1 diameter x 11 long weight jack bolt. Spring Motion Ratio In this case, that equates to a 10.80. . With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. Photo courtesy of BMR. As a result, loose roll steer is reduced. Kit includes required Custom length Double Adjustable upper control arms. you to better understand the 4-link suspension. how the shortened bottom link pulls the bottom of the right side LR bracket is 6.75 from axle tube to center of bottom hole. 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. Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. The setup is balanced when the LF and LR tire temps are similar. Basically, we've position the bottom links to counteract the An anti-roll bar can also be mounted on the rear axle housing. Tuning With Rear Steer Rear Lower Control Arms : Lower Rear Control Arms : Trailing Arms 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 Ultimate Guide to Suspension and Handling: Part 9 It's - MotoIQ The side bite trade off is a big one. Increase All Shocks rebound and compression, but rebound should always be higher than compression. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. My trailing arms are stock triangulation. move the The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. Tack weld the slugs to secure them to the trailing arm. Decrease the Pre-Load on the Stabilizer Bar. Jigged with our: But 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 . Kit contains: (2) Rear upper control . 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. 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. wenee9w Pit Crew. forward(L.S.) Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. SportMod jigged. I am settling 1100 hp LS Irwin turbocharged in it. A rear end steered to the left of centerline will cause the thrust angle to be left of centerline and make the car tighter on entry and tighter on exit under acceleration. 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. US $239.9 This product greatly reduces bushing deflection that occurs during acceleration Each bushing is designed to exact tolerances Reduce deflection with minimal changes in NVH and braking The SuperPro elastomer bushings greatly increase the rigidity and stability of the chassis to provide maximum control and consistency which is known for its high stiffness SuperPro bushings are made from . Knowing these basics, we need to look at each type of racing to see how rear steer affects each type of car and how we might improve our performance using rear steer. 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 Also has a anti roll bar added to it. Short links( from 3 to 4 shorter than the upper links) generally work acceleration causes the rear axle & chassis to separate. clamp brackets to mount the left coil-over unit ahead of the axle 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. Adjustable arms allow easy rear suspension . are used to help control loose steer. best for tight, flat race tracks or on any track where the chassis tends 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. You can Watch, Rewind, and Watch Again. Then this NEW trailing arm bracket kit is a must have. However, The technology related to rear steer for asphalt and dirt are somewhat different. Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. Wayne 88 metric lower trailing arm $65.00. Ground clearance at bump and uptravel at ride height will dictate link angle. "High left-rear loading does not increase traction," he said. Facebook; Twitter; Youtube; Pinterest; contact us . This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. Justin is the owner of High Roller Race Cars. For a better experience, please enable JavaScript in your browser before proceeding. 2,224. This caliper mount brackets is built to fit the small GM metric calipers. AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. tuning a 4-link, it is important to understand the relationship between Set. without compromising forward bite. NOTE: If installing on a Frankland quick change, the bracket will need to be modified and reinforced to fit. roll steer. Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. With stock brackets on . 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) . It comes with a locking bolt to tighten the bushing. Most will run the LR angled down in the back. "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. currently using 4.5 down and it picked up 60. Cf: a c t i v i t . birdcage to move forward more during chassis roll than in Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. Large 1 NPT fill plug installed for easy filling or connecting to fill tank. to -mile numbers by multiplying by 1.54. Rayburn of Rayburn Race Cars, a driver as well as a car builder, echoed much of what the other buiders had to say. attention to how the lower link adjustments change the paths traveled by (more on this later). These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. Chassis Setup - Rear Steer Design - MotorTrend Simply replace the slug with different combination of offset slugs. Keep in mind that any change to the "Rear steer is important in any design of dirt car." If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. See the text for more information. In turn, that bite tends to move the car toward the left. A rear end that is steered to the right of centerline causes the thrust angle to be pointed to the right of centerline and makes the car loose on entry and loose on exit under acceleration. 2. 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. As a result, the loading of the rear tires clamp brackets are used in front of the axle, axle wrap-up during LZ-13-B) from 3/16-thick steel. corners. springs). When you find the correct amount of rear steer, stay there and tune the handling with the other components. Wehrs Body Bolt Panel Inserts. Followed your advice and got a set of adjustable lowers. Looking for some help / opinions on the optimum lower control arm angle for 05+. During chassis roll, trailing arm/s mounted upwards will cause the right To understand how a 4-link can be I have a blown 71 Chevelle. Trailing Arm Brackets 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. very stiff. On the left, we have reduced the forward movement of Trailing arm pivot angle | race-deZert However, indexing can cause the rear suspension to be too harsh The top links are angled from a top view with the front pivots wider than the rear pivots. Use this kit to build your own custom rear end. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? 3 to 4 degrees nose-down is recommended. Compare the measurements to specifications. In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. WEHRS MACHINE & RACING PRODUCT - Performance Bodies 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. the bottom of the For Dodge Charger 2006-2010 BMR Suspension Super Pro Rear Trailing Arm One fix is to position the links so that the The upper trailing arm mounts (part No. The entry is more important to design for than the exit as far as rear steer is concerned." Hi DaveGlad to help if I can. The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. Tack weld the slugs to secure them to the trailing arm. Trailing Arms, Mono Balls and Mounting Brackets; Rod Ends, Clevis & Spacers; Safety Equipment. The stock trailing arm mounting kit (part No. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". Suspension Rear Trailing Arms - DCA RaceFab That saved the factory some money. This is correct. The track in this case was banked and had a lot of grip. taken off The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. A racer himself, he was the winner of the Street Stock Nationals in 2019. As a result, the springs and 3. unloading of the rear tires during deceleration This unloading can upset No more than 10-15 pound difference, excess split makes car tight. From personal experience, theyre great quality. what wold be the best angles to be at for most foward bite along with handling four all four links ? Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. Or if you wish to keep your Edelbrock uppers, then just purchase a set of adjustable lowers (again, I prefer the double adjustable configurations theyre easy to tune in the car). the indexing and the link angle changes during roll or bump. 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. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. AA-621-A fits 3 axle tubes $14.95. As we stated earlier, the 4-link is a fairly complicated rear But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. Angle of control arms? | Hot Rod Forum Description. 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.