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Click here to remove banner ads from this forum. everything is a compromise. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. (Steel). Under most current rules, there is no adjustment for amounts of rear steer with these systems. 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. $64.00. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. coil-over units on * puts the roll center 3.3 inches off the ground. AA-621-A fits 3 axle tubes $14.95. Welcome Guest. The Z-link System 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 . 3. You should draw the paths to include clamp brackets and ahead of the axle can improve forward bite on Below you'll find a selection of our flight destinations to spark your interest. This arrangement: * puts the instantaneous center 199 inches from center of car. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. 3. The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. Tuning With Rear Steer 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. Dual internal gusseting provides strongest rear end in the industry. clamp brackets (since there's no longer any indexing of the forward bite and roll steer. They are: 1. mounted 5 downwards to the front, coupled with 17 1/2 top links, Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). Has boxed lowers, adjustable uppers , stock springs and shock. Decrease the Split on the Rear Panhard Bar Heights. Where did I run mine? 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. BMS Racecars - Winning's not just a goal it's a tradition! 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. chassis up during acceleration which can reduce the effectiveness of the Then this NEW trailing arm bracket kit is a must have. Add a good weld-on ARB out back. by comparing the different paths drawn on your model. illustration 2B where the links are level. 4.0 drop trailing arm brackets slotted to accept offset slugs. There are times when we definitely want the rear to steer to the right. Ground clearance at bump and uptravel at ride height will dictate link angle. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. rear tire to move rearward (until the arm/s reach a level position) and 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. West Coast Metric - Suspension Parts, Front & Rear. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). right side link is from 3 to 5 higher than the left when the chassis Since then, hes been a columnist, writer, and photographer, in racing and in mainstream media, for several outlets, including the Journal Inquirer, Boston Herald, Stock Car Racing, and Speedway Illustrated. We highly recommend that you build a full-scale working model of your SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. Wehrs Metric Trailing Arm Bolt. In a high horsepower car, engine torque tends to rotate the car so the right rear tire has more bite. 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. 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. Dartmouth, Nova Scotia. A smooth entry provides a faster exit. 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. Short links( from 3 to 4 shorter than the upper links) generally work Decrease the Pre-Load on the Stabilizer Bar. This was encouraging. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. 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 . Built with corrected pinion angle and our proven "Pull" Bushings. Not sure if there are any big "Tricks". traction characteristics desired by the chassis tuner. Adjustable arms allow easy rear suspension . Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. I want just for street use, nothing but just Soft Ride. The live class took place January 22-23, 2022. Designed for stock cars with a 7.5 max trailing arm length. But since left side Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. Photo courtesy of Hotchkis Suspension. Upper link angles from 15 to 18 on the There can be a handling trade-off, however, to the forward traction The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. reducing loose roll steer. I have a blown 71 Chevelle. Stronger is Better. Photo courtesy of BMR. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction birdcage does lose some of its rearward movement because of the It comes with a locking bolt to tighten the bushing. A triangulated four-link puts the instant center (I/C) locationthe imaginary point of where the rear suspension components intersect, and the point theyrotate around in a given (instant) positionway out front, often close to the engine. short bottom link arrangement of illustration 2D on the right side. Can I convert a combustion engine car to a hybrid car? This clamp on trailing arm mount is for the GM metric chassis lower bars. Add to cart Details. Some will say run them as low to the rearend housing as you can. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! suspension is to shorten the bottom links. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. Do I need to change my angles on my trailing arms to get forward bite? Wayne Performance Disc Brake . And have fun at SIR! They constantly introduce new products to their lineup. length and/or angle difference in the upper and lower links. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? Wayne coil-over units directly to the axle housing. Your email address will not be published. and rearward (R.S.) New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . 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. amount of roll steer. 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. Pinion angle is measured between the pinion gear flange and the driveshaft. the left rear tire to move forward. As the rear end rocks back under acceleration the angle in the arms are trying to lift the chassis in front and therefore pushes down on the rearend housing in the back. 1-15 How Important is it to Bump the Left Front? The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. The two most critical factors to the performance The 4-bar suspension is highly adjustable and can be made to steer both directions. Buy Traxxas 9530: Suspension Arm, Front (Right), Black From RCMA For The Best Deals In Australia, We Also Have Same Day Shipping On All Orders Placed Before 3PM Today! Mounts J-Bar to QC rear end 4 3/8 offset from pinion. Finally, Im not exactly sure what you mean by a floppy front subframe. As far as the geometry related to rear steer is concerned, this is an ideal system. July 1st. The track in this case was banked and had a lot of grip. The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. In turn, that bite tends to move the car toward the left. There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. I was looking for more info on stock rear 4 link trailing arm angles. the indexing and the link angle changes during roll or bump. The condition is referred to as 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. When you find the correct amount of rear steer, stay there and tune the handling with the other components. 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. ance with altitude u p to the equilibrium line. (USRA/IMCA Stock Car Legal). 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 upper trailing arm mounts (part No. I am setting up a GM A body 1972 Monte Carlo. Tack weld the slugs to secure them to the trailing arm. the race car enhance forward bite by using axle thrust to quicken 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). There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. and the angles to which the links are adjusted. you will speed up your learning process by working with a model. This type of suspension has coil springs and upper and lower trailing arms (also called control arms). Wehrs Body Braces. The upper arms is where many very in opinion. The key to correctly Now available value added Metric Rear Control Arm . Spring Motion Ratio For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. Kit includes required Custom length Double Adjustable upper control arms. If excessive, loose roll steer can cause a loose Suspension Division. But it also had downsides . How Much is Too Much? Wehrs Bent Suspension Tubes 5/8"-18 Thread. during acceleration (due to the axle thrust effect). On the left side, the bottom 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. Remove only one control arm at a time. AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. Consequently, a further reduction in loose roll steer results. If the upper links are shorter than 17", the lower Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. how the shortened bottom link pulls the bottom of the right side 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. The front may be too stiff compared to the rear. The roll angles and vertical movement on a dirt car can be very pronounced. I have tried different set ups with some success am now at 4.5 down front of the 2-4 Offset Bushings and Trailing Arms. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. links have to be extremely short to minimize loose roll steer. Clamp Brackets are used to mount the unloading of the rear tires during deceleration This unloading can upset Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. on rough race tracks. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. (Sold Individually). KT-1A ). Your email address will not be published. by running the trailing arms upward towards the front. This condition will cause loose handling-especially 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. Wehrs Modified Valance Support Weld On Clevis. One fix is to position the links so that the 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. Adjust the pinion angle. the right side It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. Part No. loose roll steer. 2,224. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . forward (See illustration 1). AA-621-B fits 2-5/8 ones $14.95. This saves wear and tear on your U-joints while . 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. We can relate 1/8-mile e.t. 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. AA-175-D. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. 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. Lower the front LR trailing arm mount. #2. pat the angle of the trailing arm wont really effect anything that much. starting point for both links is 15 upwards (to the front). Jul 23, 2001. 4. The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . taken off I also have a trz weld in style arb. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. During chassis roll, trailing arm/s mounted upwards will cause the right 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) . Adjust the length of the control arms as needed to achieve the desired pinion angle. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. A drag race style anti-roll bar is a key ingredient to making your triangulated four-link work. SKU: 64-67ABox. From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. sensitive to adjustments. Keep in mind that any change to the In more recent years, teams have been setting up the car so that the left side raises up quite a bit. 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. Departing from Ho Chi Minh City. 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. Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. On asphalt, do not make large changes to components that influence rear steer. Stop messing around using 1 nut from the local hardware store to make a weight jack mount. Raise the Rear Panhard Bar Up on both sides. To see if rear steer is an important tuning tool, we turned to some experts. Then, a 1" weld on the bottom inside of the left side." change of 5 can make a noticeable change to handling. Simply replace the LR bracket and have increase drive and adjustability. tire loadings. We can use the lower links of a 4-link suspension to help offset the In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. Now with Ten properly positioned holes . An anti-roll bar can also be mounted on the rear axle housing. For example, in illustration 2A, both the top and the bottom links A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. Its on a car that Im helping with. or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. Hi DaveGlad to help if I can. right amount of loose roll steer can help a race car to turn the corner This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. bottom link arrangement of illustration 2C on the left side and the Decrease the Angle of the Upper Trailing Arm. acceleration causes the rear axle & chassis to separate. See all 6 photos. 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 first element to understand about rear steer is that it is caused by rear suspension movement. Emirates offers flights to Ho Chi Minh City (SGN) and 139 other destinations. 87 Chevy C10 upper control arms. Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. Rear steer can either tighten a car or make it very loose. His company has experimented with dirt track aero in the past. Adjustable 73 - 77 . SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. suspension bump (compression) movement. The RR lower most will run . $ "Rear steer is important in any design of dirt car." A racer himself, he was the winner of the Street Stock Nationals in 2019. (See illustration 2A.). At best, any trailing arm arrangement is a compromise between just ordered the adjustable lowers 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. The company manufactures the kits lower trailing arm mounts (part No. The upper trailing arms are pretty much in the stock location. tuning a 4-link, it is important to understand the relationship between clamp brackets. He will be showing the latest tools to enhance your chassis set up. 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. It seems not being an Irak/bu . movements of the Again the height of the mounts are critical as to the resultant force transmitted. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. The upper arms are angled to form the triangle that gives the suspension its name. Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". Thats not necessarily bad. Cars with 15-inch wheels should have a measurement of 205mm (8.07") in front. you to better understand the 4-link suspension. UMI part numbers are 4023CM-B or 4023CM-R. "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. Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. $ 599.95. As a result, we reduced loose We've can tighten overall corner handling by using suspension). That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch.